John Deere 5720 Manual: Your Comprehensive Guide

Safety First

General Safety Information

Operating and maintaining your John Deere 5720 tractor requires a thorough understanding of safety procedures. It is paramount that you, as the operator, prioritize safety to prevent accidents, injuries, and even fatalities. Before operating the tractor, dedicate time to meticulously read and comprehend this manual in its entirety. Familiarize yourself with the location and function of all controls and safety devices. Never assume you know how something works; take the time to verify and ensure you fully understand its operation.

Personal Protective Equipment (PPE) is non-negotiable when working with heavy machinery. Always wear appropriate eye protection, such as safety glasses or goggles, to shield your eyes from flying debris and other hazards. Hearing protection, like earplugs or earmuffs, is crucial to mitigate the risk of hearing damage from prolonged exposure to the engine's noise. Furthermore, wear sturdy, closed-toe footwear with good traction to prevent slips and falls. Avoid loose clothing or jewelry that could get caught in moving parts.

Safe Operation Practices

Starting the engine should always be done from the operator's seat, ensuring the transmission is in neutral or park. Never attempt to start the engine by bypassing the safety interlocks. These interlocks are designed to prevent accidental starts that could lead to serious injury. Before starting, thoroughly inspect the tractor for any visible damage, leaks, or loose parts. Address any issues immediately before operation.

When operating on slopes or uneven terrain, exercise extreme caution. Reduce speed and avoid sudden turns to prevent the tractor from tipping over. Be aware of the terrain's characteristics and adjust your operating techniques accordingly. Avoid operating near ditches, embankments, or other drop-offs where the risk of rollover is increased. Always maintain a firm grip on the steering wheel and be prepared to react to unexpected situations.

Transporting implements or attachments requires careful consideration of weight distribution and stability. Ensure the implement is properly secured and balanced to prevent swaying or instability during transport. Always use the appropriate hitching mechanisms and safety chains. Adhere to all traffic laws and regulations when operating on public roads. Use warning lights and reflectors to increase visibility to other drivers.

Warning Labels and Symbols

Your John Deere 5720 tractor is equipped with various warning labels and symbols to alert you to potential hazards. These labels are strategically placed throughout the tractor to draw your attention to specific risks. Take the time to familiarize yourself with the meaning of each label and symbol. If a label is damaged or missing, immediately replace it to ensure that you and others are aware of potential dangers.

Understanding these symbols is essential for safe operation. Symbols often depict the type of hazard, the severity of the risk, and the recommended precautions. The manual will have details on any relevant symbols that are shown on the vehicle. Pay close attention to labels indicating pinch points, rotating parts, high-pressure fluids, and electrical hazards. Ignoring these warnings could result in serious injury or death. Always err on the side of caution and seek clarification if you are unsure about the meaning of a particular label or symbol.

Getting Started

Tractor Overview

The John Deere 5720 is a robust and versatile tractor designed for a wide range of agricultural tasks. Understanding its key components and their functions is crucial for safe and efficient operation. This manual will guide you through everything from basic operation to troubleshooting and maintenance. Familiarize yourself with the location of key components like the engine, transmission, hydraulic system, and PTO before operating the tractor. Regular inspection and adherence to the recommended maintenance schedule will ensure the longevity and optimal performance of your John Deere 5720.

Before you even turn the key, take a walk around the tractor. Note the location of the fuel tank, the hydraulic fluid reservoir, and the engine oil dipstick. Check the condition of the tires, looking for signs of wear or damage. Ensuring proper tire inflation is essential for both performance and safety. Finally, familiarize yourself with the location of safety features such as the emergency stop button and the parking brake. These pre-operation checks, even when brief, are critical in preventing accidents and ensuring optimal performance.

Instrument Panel and Controls

The instrument panel provides essential information about the tractor's operating condition. Pay close attention to the gauges for engine temperature, oil pressure, and fuel level. Familiarize yourself with the warning lights and understand what each one indicates. Ignoring warning lights can lead to serious mechanical damage, so promptly investigate any illuminated warnings. Understanding the instrument panel is paramount for proactively addressing potential issues and maintaining peak operating condition. The more familiar you are with the panel, the faster you will realize when something is wrong with the tractor.

The controls for the John Deere 5720 are ergonomically designed for ease of use. The steering wheel controls the direction, while the throttle controls engine speed. The gearshift lever selects the appropriate gear for the task at hand. The hydraulic levers control the operation of implements connected to the tractor. Take the time to practice using these controls in a safe and controlled environment before operating the tractor in the field. A thorough understanding of these functions before you start working in the field is essential for both safety and productivity.

Pre-Operation Checks

Performing pre-operation checks is an essential part of responsible tractor operation. Before starting the engine, check the engine oil level, coolant level, and hydraulic fluid level. Inspect the air filter for cleanliness and replace if necessary. Check the tires for proper inflation and damage, as indicated earlier. These simple checks can prevent costly repairs and ensure the tractor operates safely and efficiently. They also contribute to extending the lifespan of your equipment. Don't underestimate the value of taking this time before each use!

Additionally, inspect all lights and signals to ensure they are functioning properly. Clean the windshield and mirrors for optimal visibility. Check the condition of the safety devices, such as seat belts and ROPS (Roll-Over Protective Structure). Ensure that all guards and shields are in place. By diligently performing these pre-operation checks, you are contributing to a safer and more productive working environment. These quick inspections minimize the risk of unexpected breakdowns and ensures that your tractor is ready for the task at hand.

Operating Instructions

Starting and Stopping the Engine

Before initiating the engine start sequence on your John Deere 5720, it is paramount to ensure the tractor is in a safe and secure position. Confirm the parking brake is fully engaged and the transmission is in neutral. Visually inspect the surrounding area for any obstructions or potential hazards that may pose a risk during operation. This includes ensuring no persons, animals, or objects are within the tractor's operating radius. Familiarize yourself with the location and function of all safety controls before starting the engine.

To start the engine, insert the key into the ignition switch and turn it to the "ON" position. Allow the instrument panel to illuminate and verify that all warning lights are functioning correctly. If the tractor is equipped with a pre-heat system, engage it according to the manufacturer's instructions, especially in cold weather conditions. Once the pre-heat cycle is complete, turn the key to the "START" position and hold it until the engine starts. Avoid prolonged cranking to prevent damage to the starter motor.

After the engine has started, allow it to idle for a few minutes to warm up. This allows the engine oil to circulate and reach optimal operating temperature. During this warm-up period, listen for any unusual noises or vibrations that may indicate a mechanical problem. Monitor the gauges on the instrument panel to ensure that all systems are functioning within their normal operating ranges. If any abnormalities are detected, immediately shut down the engine and investigate the cause.

To stop the engine, release the throttle and allow the engine to idle for a short period. This allows the engine to cool down gradually and prevents thermal shock. Turn the ignition switch to the "OFF" position to stop the engine. Once the engine has stopped, remove the key from the ignition switch and store it in a safe place. Remember to always engage the parking brake and chock the wheels if the tractor is parked on an incline.

Transmission Operation

The John Deere 5720 transmission is the heart of its mobility, enabling a range of speeds and power outputs for various tasks. Prior to operating the transmission, familiarize yourself with the location and function of all gear levers and range selectors. The transmission allows for precise control over the tractor's speed and torque, ensuring optimal performance in different operating conditions. Incorrect operation of the transmission can lead to reduced efficiency and potential damage to the drivetrain.

To shift gears, disengage the clutch pedal fully and smoothly move the gear lever to the desired position. Avoid jerky or abrupt movements to prevent damage to the gears. The 5720 often features a synchronized transmission, which allows for smooth shifting while the tractor is in motion. However, it is still essential to match the engine speed and ground speed for optimal shifting performance. Listen carefully for any grinding or unusual noises during shifting, as this may indicate a problem with the transmission.

The range selector allows you to choose between different gear ranges, such as low, medium, and high. Each range provides a different set of gear ratios, allowing you to tailor the tractor's performance to the specific task at hand. Low range is ideal for heavy-duty applications that require high torque and low speed, such as pulling heavy implements or working in challenging terrain. High range is better suited for transportation and lighter tasks where speed is more important.

When operating the tractor on slopes, it is crucial to select the appropriate gear and range to maintain control. Avoid shifting gears while climbing or descending steep hills, as this can lead to loss of traction and potentially dangerous situations. Always use the parking brake when parking the tractor on an incline. Regularly inspect the transmission fluid level and condition to ensure proper lubrication and prevent premature wear.

Hydraulic System Operation

The hydraulic system of the John Deere 5720 is vital for operating implements, steering, and other functions. Understanding the proper operation of the hydraulic system is essential for maximizing its efficiency and preventing damage. The system relies on hydraulic fluid under pressure to transmit power from the engine to the various hydraulic cylinders and motors. Regular maintenance and proper operating procedures are crucial for maintaining the reliability of the hydraulic system.

Before operating any hydraulically powered implement, familiarize yourself with the location and function of the hydraulic control levers. These levers allow you to control the flow of hydraulic fluid to the implement, raising, lowering, and adjusting its position. Ensure that all hydraulic hoses and connections are properly secured and free from leaks. Leaks can reduce the efficiency of the system and pose a safety hazard.

When operating hydraulic implements, avoid exceeding the maximum rated pressure of the hydraulic system. Overloading the system can damage hydraulic components and lead to premature failure. Monitor the hydraulic pressure gauge on the instrument panel to ensure that the system is operating within its safe range. If the pressure exceeds the recommended limit, reduce the load or adjust the hydraulic settings.

The hydraulic system also incorporates a filtration system to remove contaminants from the hydraulic fluid. Regularly inspect and replace the hydraulic filter according to the manufacturer's recommendations. Contaminated hydraulic fluid can damage hydraulic components and reduce the efficiency of the system. Ensure that you use the correct type of hydraulic fluid specified for the John Deere 5720.

PTO Operation

The Power Take-Off (PTO) on your John Deere 5720 is designed to transfer engine power to implements, such as mowers, tillers, and balers. Engaging and disengaging the PTO safely is paramount. Before engaging the PTO, be absolutely sure everyone is clear of the implement and the immediate area surrounding the tractor. Keep clothing away from the PTO shaft. Loose garments can be caught in moving parts, leading to serious injuries.

To engage the PTO, follow the specific instructions outlined in the operator's manual for your 5720 model. Typically, this involves engaging a PTO lever or switch. Ensure the engine speed is appropriate for the implement being used. Operating the PTO at excessive speeds can damage the implement and the PTO system.

Never attempt to clean, adjust, or repair an implement while the PTO is engaged. Always disengage the PTO and shut off the engine before performing any maintenance. Use PTO shaft guards at all times. Missing or damaged guards can significantly increase the risk of injury.

Three-Point Hitch Operation

The three-point hitch is critical for attaching and operating a multitude of implements. Before using the three-point hitch, ensure all components are in good working order, including the lift arms, top link, and sway chains. Inspect for any signs of damage or wear, and replace parts as needed. Understanding the three-point hitch controls allows for safe and efficient implement operation.

Adjust the lift arms and top link to the proper length for the implement being used. This ensures the implement is level and operates correctly. Use the sway chains to prevent the implement from swaying excessively during operation. Improperly adjusted sway chains can cause the implement to bind or damage the hitch components.

When attaching an implement, make sure it is securely locked onto the hitch pins. Use safety pins to prevent the implement from detaching during operation. Raise and lower the implement slowly and smoothly. Avoid jerky movements, which can put unnecessary stress on the hitch components.

Working with Implements

Operating farm implements with your John Deere 5720 requires careful planning and attention to detail. Always consult the implement's operator's manual before use to understand its specific operating requirements and safety precautions. Prior to starting work, conduct a thorough inspection of the implement to ensure all parts are in good working order and properly lubricated. Never operate an implement that is damaged or in need of repair.

When working with implements, maintain a safe operating speed that is appropriate for the implement and the terrain. Avoid making sudden turns or stops, which can cause the implement to become unstable or damage the tractor. Be aware of any obstacles in the field, such as rocks, trees, or fences, and take precautions to avoid them. Always be mindful of the implement's width and height, especially when operating in confined areas.

After completing work with an implement, clean it thoroughly and store it in a safe and secure location. Lubricate all moving parts to prevent corrosion and ensure smooth operation during future use. Properly maintained implements will last longer and perform more reliably. Regularly inspect the implement for wear and tear and replace any worn or damaged parts promptly.

Maintenance

Maintenance Schedule

Regular maintenance is the key to ensuring the longevity and optimal performance of your John Deere 5720 tractor. A well-defined maintenance schedule, diligently followed, can prevent costly repairs and downtime. Consult the complete maintenance schedule in this manual for specific intervals and procedures. Pay close attention to the recommended intervals for oil changes, filter replacements, lubrication, and inspection of various components. Always keep a record of completed maintenance tasks for future reference and warranty purposes, this documentation can be invaluable for tracking service history and identifying potential issues early on.

Developing a proactive approach to maintenance can save you significant expenses in the long run. Ignoring seemingly minor issues can often lead to major breakdowns, resulting in costly repairs and extended downtime. Regular inspections, lubrication, and timely replacements of worn parts can prevent these problems from escalating. Remember that preventative maintenance is not just about following a schedule; it's about understanding your tractor's needs and addressing them promptly. Prioritize regular servicing to ensure smooth operation and maximum efficiency from your John Deere 5720 tractor.

Engine Maintenance

The engine is the heart of your tractor, and its proper maintenance is crucial for reliable performance. Regularly check the engine oil level, coolant level, and fuel filter to ensure everything is within the specified ranges. Changing the engine oil and filter at the recommended intervals is paramount to prevent wear and tear on engine components. Insufficient or contaminated oil can lead to increased friction, overheating, and ultimately, engine failure. Ensure you always use the correct type and grade of oil as specified in the manual to maintain optimal engine lubrication and cooling.

Additionally, inspect the air filter regularly and clean or replace it as needed. A dirty air filter restricts airflow to the engine, reducing its power output and fuel efficiency. Also, check the condition of the cooling system, including the radiator, hoses, and coolant reservoir. Leaks or blockages in the cooling system can cause the engine to overheat, leading to serious damage. Remember to inspect the exhaust system for leaks and damage. Exhaust leaks not only reduce engine efficiency but can also pose a safety hazard. Consistent attention to these engine components will help you ensure long-term reliable engine operation.

Transmission Maintenance

The transmission is responsible for transferring power from the engine to the wheels, and its smooth operation is vital for efficient performance. Regularly check the transmission fluid level and inspect it for any signs of contamination. Low fluid levels or contaminated fluid can cause slippage, gear grinding, and eventually, transmission failure. Change the transmission fluid and filter at the recommended intervals using the correct type and grade of fluid as specified in the manual. This will help maintain proper lubrication and cooling, preventing wear and tear on internal transmission components.

Also, inspect the transmission linkage for proper adjustment and lubrication. Misaligned or poorly lubricated linkages can cause difficulty in shifting gears and premature wear on the transmission. Additionally, pay attention to any unusual noises or vibrations coming from the transmission. These can be early warning signs of potential problems that should be addressed promptly. Regular servicing and inspections of the transmission will contribute to its longevity and reliable performance.

Hydraulic System Maintenance

The hydraulic system powers various functions on your tractor, such as lifting implements, steering, and braking. Ensuring its proper operation is essential for safe and efficient work. Regularly check the hydraulic fluid level and inspect it for any signs of contamination. Low fluid levels or contaminated fluid can cause reduced performance, jerky movements, and damage to hydraulic components. Change the hydraulic fluid and filter at the recommended intervals using the correct type and grade of fluid as specified in the manual to maintain proper system performance.

Inspect all hydraulic hoses and fittings for leaks or damage. Leaks can not only reduce system performance but also pose a safety hazard. Replace any damaged hoses or fittings immediately. Regularly lubricate all hydraulic cylinders and pivot points to ensure smooth operation and prevent wear. Also, check the hydraulic pump for any unusual noises or vibrations, as these could indicate potential problems. Proactive maintenance of the hydraulic system will prevent costly repairs and ensure its reliable performance for years to come.

Electrical System Maintenance

The electrical system powers various functions on your tractor, including starting, lighting, and instrumentation. Maintaining its integrity is crucial for reliable operation. Regularly check the battery terminals for corrosion and clean them as needed. Corroded terminals can reduce battery performance and lead to starting problems. Inspect the wiring harness for any signs of damage, such as frayed wires or loose connections. Damaged wiring can cause shorts, electrical fires, and malfunctions of various electrical components.

Also, check the condition of the lights, including headlights, taillights, and turn signals. Replace any burned-out bulbs immediately. Ensure that all fuses are in good condition and of the correct amperage. Blown fuses can indicate a more significant problem that needs to be addressed. Clean and inspect the starter and alternator for proper operation. A malfunctioning starter or alternator can prevent the engine from starting or charging the battery. Regular inspections and maintenance of the electrical system will help you avoid unexpected breakdowns and ensure its reliable performance.

Lubrication

Proper lubrication is essential for reducing friction and wear on moving parts throughout your tractor. Regularly lubricate all grease fittings according to the lubrication chart in the manual. Use the correct type of grease for each application. Insufficient lubrication can lead to premature wear, increased operating temperatures, and ultimately, component failure. Over-lubrication can also be detrimental, attracting dirt and debris that can accelerate wear.

Clean grease fittings before applying grease to prevent contaminants from entering the bearings. Also, lubricate all pivot points, linkages, and control cables to ensure smooth operation. Pay particular attention to areas that are exposed to dirt, dust, and moisture. Regular lubrication is a simple yet effective way to extend the life of your tractor and prevent costly repairs.

Filter Replacement

Filters play a crucial role in protecting various systems on your tractor from contaminants. Regularly replace all filters, including the engine oil filter, air filter, fuel filter, hydraulic filter, and transmission filter, at the recommended intervals. Dirty filters restrict flow and allow contaminants to circulate through the system, causing wear and damage. Using high-quality filters is also essential, as they offer better filtration and longer service life.

When replacing filters, be sure to follow the manufacturer's instructions carefully. Improper installation can lead to leaks or reduced performance. Dispose of used filters properly according to local regulations. Regularly replacing filters is a relatively inexpensive way to protect your tractor's vital systems and prevent costly repairs.

Tire Maintenance

Proper tire maintenance is essential for maximizing traction, fuel efficiency, and tire life. Regularly check the tire pressure and inflate to the recommended levels. Underinflated tires can reduce fuel efficiency, increase wear, and make the tractor more difficult to control. Overinflated tires can reduce traction and increase the risk of punctures.

Inspect the tires for any signs of damage, such as cuts, bulges, or embedded objects. Remove any sharp objects from the tires and repair any minor damage promptly. Rotate the tires regularly to ensure even wear. Also, align the front wheels periodically to prevent uneven wear and improve steering stability. Proper tire maintenance will not only save you money on tire replacements but also improve the overall performance and safety of your tractor.

Troubleshooting

Engine Problems

Engine problems are a common concern for tractor operators, often manifesting as difficulty starting, loss of power, unusual noises, or excessive smoke. A methodical approach is crucial for diagnosing the root cause. Begin by checking the basics: fuel supply, air intake, and battery condition. Ensure that the fuel tank is adequately filled with the correct type of fuel and that the fuel filter is clean and not clogged. Inspect the air filter for dirt and debris, as a restricted air intake can significantly impact engine performance. Verify the battery voltage and connections to rule out electrical issues contributing to starting problems or weak engine performance. Addressing these fundamental aspects first can often resolve minor engine issues and prevent further complications.

If the basic checks don't reveal the issue, delve deeper into specific engine components. Compression testing can identify worn piston rings or valve issues, which lead to reduced power and efficiency. Examine the fuel injectors or carburetor for proper function and spray patterns, as malfunctioning fuel delivery systems can cause erratic engine behavior. Inspect the cooling system for leaks, clogs, or a faulty thermostat, as overheating can severely damage the engine. Don't overlook the exhaust system; a blocked muffler can restrict exhaust flow and diminish engine power. Regularly scheduled maintenance, including oil changes and filter replacements, plays a vital role in preventing many engine problems.

Transmission Problems

Transmission problems can manifest in various ways, including difficulty shifting gears, slipping gears, unusual noises, or complete loss of drive. These issues can significantly impact the tractor's performance and productivity. Begin by checking the transmission fluid level and condition. Low fluid levels or contaminated fluid can cause slipping gears and damage to internal components. Inspect the linkage and cables that connect the gear shift lever to the transmission, as loose or damaged connections can hinder smooth shifting. Addressing these initial checks can help identify common causes of transmission issues.

If the initial checks don't resolve the problem, further investigation into internal transmission components may be necessary. Examine the clutch, if equipped, for wear or damage, as a worn clutch can cause slipping gears and difficulty engaging. Check the synchronizers for proper function, as worn synchronizers can make shifting gears difficult. Internal transmission issues can be complex and may require specialized tools and knowledge to diagnose and repair. Consulting a qualified tractor mechanic is recommended for addressing significant transmission problems to ensure proper repair and prevent further damage.

Hydraulic System Problems

The hydraulic system is essential for various tractor functions, including lifting implements, steering, and operating attachments. Hydraulic problems can manifest as slow or weak implement response, jerky movements, leaks, or complete failure of hydraulic functions. The first step in troubleshooting is to check the hydraulic fluid level and condition. Low fluid levels or contaminated fluid can significantly impact hydraulic performance. Inspect the hydraulic lines, hoses, and fittings for leaks, cracks, or damage, as leaks can reduce system pressure and efficiency. A visual inspection of these components is a crucial first step in diagnosing hydraulic issues.

If the initial checks don't identify the problem, further investigation of hydraulic components may be needed. Examine the hydraulic pump for proper function and pressure output, as a worn or damaged pump can cause reduced hydraulic performance. Check the hydraulic cylinders for leaks, damage to seals, or internal issues, as these problems can result in slow or weak implement response. Inspect the hydraulic valves for proper operation and function, as faulty valves can disrupt hydraulic flow and cause various issues. Due to the complexity of hydraulic systems, consulting a qualified tractor mechanic is recommended for addressing significant hydraulic problems.

Electrical System Problems

Electrical system problems can affect various tractor functions, including starting, lighting, and operation of electronic components. These issues can range from simple blown fuses to more complex wiring problems. Begin by checking the battery voltage and connections, ensuring they are clean and tight. Inspect the fuses and circuit breakers for blown fuses or tripped breakers, as these are often the first indication of an electrical issue. A visual inspection of the wiring harness for damaged or corroded wires can also help identify potential problems. Addressing these basic checks can often resolve minor electrical issues.

If the initial checks don't reveal the problem, further investigation using a multimeter may be necessary. Check the alternator or generator for proper charging output, as a faulty charging system can lead to a dead battery and starting problems. Test the switches, relays, and sensors for proper function, as these components control various electrical functions. Inspect the wiring diagram to trace circuits and identify potential shorts or open circuits. Electrical system problems can be complex, so consulting a qualified tractor mechanic is recommended for addressing significant electrical issues to ensure proper diagnosis and repair.

Starting Problems

Starting problems can be a frustrating issue for tractor operators, often resulting in downtime and delays. These problems can manifest as a slow cranking engine, no cranking at all, or the engine starting but immediately stalling. Start by checking the battery voltage and connections, ensuring they are clean, tight, and properly charged. Inspect the starter motor for proper function; a faulty starter motor can cause slow or no cranking. Verify the fuel supply by checking the fuel level and ensuring that fuel is reaching the engine. Addressing these initial checks can help identify common causes of starting problems.

If the initial checks don't resolve the problem, further investigation may be necessary. Check the ignition system for proper spark (for gasoline engines) or glow plug function (for diesel engines). Inspect the fuel shut-off solenoid for proper operation, as a malfunctioning solenoid can prevent fuel from reaching the engine. Compression testing can also identify issues with the engine that may prevent it from starting. Due to the complexity of engine starting systems, consulting a qualified tractor mechanic is recommended for addressing persistent starting problems.

Steering Problems

Steering problems can compromise the safety and maneuverability of the tractor. Common steering problems include difficulty steering, excessive play in the steering wheel, jerky steering, or a complete loss of power steering. Begin by checking the power steering fluid level, if equipped, as low fluid levels can cause difficulty steering. Inspect the steering linkage for loose or damaged components, as these can cause excessive play in the steering wheel. Verify the tire pressure is correct, as uneven tire pressure can contribute to steering problems. Addressing these initial checks can help identify common causes of steering issues.

If the initial checks don't resolve the problem, further investigation of the steering components may be necessary. Examine the power steering pump for proper function and pressure output, as a faulty pump can cause difficulty steering. Check the steering cylinder for leaks or damage to seals, as these can reduce steering assist. Inspect the steering gear box for wear or damage, as worn components can cause excessive play in the steering wheel. Due to the importance of steering for safe tractor operation, consulting a qualified tractor mechanic is recommended for addressing significant steering problems.

Repair Procedures

Engine Repair

The engine is the heart of your John Deere 5720, and proper maintenance and timely repairs are crucial for ensuring its longevity and optimal performance. Before attempting any engine repair, be sure to thoroughly disconnect the battery to prevent accidental electrical shocks or sparking. Always consult the engine's service manual for specific torque specifications and part numbers relevant to your particular engine model, as variations may exist. Remember to carefully label and organize all removed parts to facilitate accurate reassembly, paying close attention to gasket orientation and sealing surfaces.

When addressing issues like low compression, start by inspecting the valve train, including the rocker arms, pushrods, and valve springs, for any signs of wear or damage. A worn camshaft lobe or a broken valve spring can significantly impact engine performance. If valve issues are ruled out, perform a cylinder leak-down test to pinpoint the source of compression loss to the pistons, rings, or cylinder head gasket. If you suspect the piston rings are worn replace them when possible

If you need to remove the cylinder head, ensure the engine is completely cool before proceeding to prevent warpage of the cylinder head or damage to the block. Carefully loosen the cylinder head bolts in the reverse order of the tightening sequence to avoid distortion. Before reinstalling the head, thoroughly clean both the head and block surfaces and inspect the head for cracks, especially around the valve seats. A warped or cracked head must be replaced or professionally resurfaced to maintain a proper seal. A warped head can cause engine damage.

Transmission Repair

The transmission is responsible for transferring power from the engine to the wheels, and any problems with this system can severely impact your tractor's operability. Before beginning any transmission repair, be sure to drain the transmission oil into a clean container for later inspection. Look for any metal shavings or debris in the oil, as this can indicate internal wear or damage to gears, bearings, or other components. Having the proper tools when doing a transmission repair is essential.

When diagnosing transmission issues such as slipping gears or difficulty shifting, begin by checking the external linkage and control cables for proper adjustment and free movement. Sometimes, a simple adjustment of the shift linkage can resolve common shifting problems. If the external components are functioning correctly, the issue likely lies within the transmission housing.

Opening the transmission requires meticulous attention to detail and a clean working environment. Document the position and orientation of each gear, shaft, and bearing as you disassemble the unit. Pay close attention to the condition of the gear teeth, looking for signs of wear, chipping, or cracking. Inspect the bearings for smooth rotation and replace any that feel rough or exhibit excessive play. A damaged bearing can cause significant wear to other components.

Hydraulic System Repair

The hydraulic system powers many of your tractor's functions, including the loader, hitch, and power steering. A malfunctioning hydraulic system can render your tractor unable to perform essential tasks. Before starting any hydraulic repair, relieve the pressure in the system by operating any hydraulic levers multiple times with the engine off. This will prevent potential injury from high-pressure oil leaks. Always wear safety glasses when working with hydraulic components.

When troubleshooting hydraulic problems such as slow or weak operation, begin by checking the hydraulic fluid level and condition. Low fluid levels or contaminated fluid can cause significant performance issues. Inspect all hydraulic hoses and fittings for leaks, cracks, or other signs of damage. Tighten any loose fittings and replace damaged hoses immediately. A small leak can quickly escalate into a major problem.

The hydraulic pump is the heart of the system, and its failure can cause widespread hydraulic issues. Before replacing the pump, confirm that the drive shaft is turning freely and that the pump is receiving adequate lubrication. Disconnect the hydraulic lines from the pump and inspect the pump inlet screen for debris or blockage. A clogged screen can starve the pump of oil, leading to premature failure. When installing a new pump, prime it with hydraulic fluid to prevent cavitation during startup.

Electrical System Repair

The electrical system controls various functions, from starting the engine to powering lights and accessories. Electrical problems can range from simple annoyances to complete tractor immobilization. Always disconnect the battery before working on the electrical system to prevent accidental shorts or damage to electrical components. Use a multimeter to test voltage, continuity, and resistance to diagnose electrical issues accurately. Be sure to check the basics.

When diagnosing starting problems, begin by checking the battery voltage and the condition of the battery terminals and cables. Clean any corrosion from the terminals and tighten the cable connections. If the battery is weak, charge it or replace it with a new one of the correct voltage and amperage. A good connection can be the solution.

If the engine cranks but fails to start, check the spark plugs, ignition coil, and fuel pump. Verify that the spark plugs are clean and properly gapped. Test the ignition coil for proper output voltage. If the fuel pump is not delivering fuel, check the fuel filter for clogs and the fuel pump relay for proper operation. A systematic approach is essential for diagnosing electrical problems.

Brake System Repair

A properly functioning brake system is crucial for safe operation. Brake problems can compromise your ability to stop the tractor quickly and safely. Before working on the brake system, block the wheels to prevent accidental movement of the tractor. Disconnect the brake lines carefully, and plug them to prevent fluid from leaking out and contaminating the surrounding area. Make sure the area is well ventilated.

When diagnosing brake problems such as weak or uneven braking, begin by inspecting the brake pads or shoes for wear. Replace worn brake components immediately. Check the brake rotors or drums for scoring, warping, or cracking. Resurface or replace damaged rotors or drums to ensure proper brake function. Brake systems are essential to operate machinery safely.

Bleeding the brake system is necessary after replacing any brake components or if air has entered the system. Use the correct brake fluid for your tractor model. Start bleeding the brakes at the wheel furthest from the master cylinder and work your way closer. Have an assistant pump the brake pedal while you open and close the bleeder valve until all air bubbles are removed from the fluid. A properly bled brake system will provide firm and responsive braking.

Specifications

Engine Specifications

The John Deere 5720 is equipped with a robust and reliable diesel engine, designed for optimal performance and fuel efficiency. This engine typically features a four-cylinder configuration, providing a balanced combination of power and smooth operation. The precise engine model and specifications may vary slightly depending on the year of manufacture and specific configuration, but it consistently delivers ample torque for various agricultural tasks. Regular maintenance, including oil changes and filter replacements, is crucial to ensure the engine continues to operate at its peak performance and longevity. Always consult your specific engine model's manual for exact fluid specifications and maintenance schedules.

Key engine specifications to consider include the displacement, which is measured in cubic inches or liters, and reflects the total volume displaced by the pistons during each engine cycle. The engine horsepower rating indicates the maximum power output available, while the torque rating specifies the engine's rotational force, critical for pulling heavy loads. Fuel consumption is another important factor, especially when calculating operational costs. Finally, understanding the engine's compression ratio and the recommended fuel type are vital for its proper functioning and preventing damage. These details are readily available in the tractor's operator manual or the engine manufacturer's documentation.

Transmission Specifications

The transmission system of the John Deere 5720 is designed to transfer power from the engine to the wheels, allowing the tractor to operate at different speeds and torque levels. The 5720 model may feature various transmission options, including synchro-mesh transmissions, power quad transmissions, or even hydrostatic transmissions. Synchro-mesh transmissions offer synchronized shifting, allowing for smoother gear changes without requiring the operator to double-clutch. Power quad transmissions offer additional ranges and on-the-go shifting capabilities, enhancing productivity in the field.

The transmission specifications define the number of forward and reverse gears available, as well as the speed range attainable in each gear. It's important to understand the gear ratios to select the optimal gear for specific tasks, optimizing fuel efficiency and preventing excessive engine strain. The presence of features like differential lock and creeper gears further enhances the tractor's versatility, allowing it to operate in challenging terrains and perform specialized tasks. Proper lubrication and maintenance of the transmission are crucial to prevent wear and ensure smooth and reliable operation. Refer to the operator's manual for the correct type of transmission fluid and recommended maintenance intervals.

Hydraulic System Specifications

The hydraulic system in the John Deere 5720 is essential for operating various implements and attachments, such as loaders, mowers, and plows. The system relies on hydraulic fluid under pressure to provide the necessary force for lifting, lowering, and controlling these implements. Key hydraulic specifications include the pump flow rate, measured in gallons per minute (GPM) or liters per minute (LPM), which determines the speed at which hydraulic functions can be performed. The system pressure, measured in pounds per square inch (PSI) or bar, indicates the maximum force the system can exert.

The number and type of hydraulic remotes available on the tractor influence its compatibility with various implements. Single-acting remotes provide hydraulic power in one direction, while double-acting remotes provide power in both directions, allowing for more complex hydraulic functions. The capacity of the hydraulic reservoir determines the amount of hydraulic fluid available for continuous operation. Regular inspection and maintenance of the hydraulic system, including checking for leaks, replacing filters, and monitoring fluid levels, are critical to prevent damage and ensure safe and reliable operation.

Electrical System Specifications

The electrical system of the John Deere 5720 powers various components, including the starter motor, lights, instruments, and other accessories. A standard 12-volt system is typically used, with a battery providing the initial power to start the engine. The alternator or generator recharges the battery while the engine is running, ensuring a continuous power supply. Key electrical specifications include the battery voltage and amp-hour rating, which indicate the battery's capacity to store and deliver electrical power.

The alternator or generator's output amperage determines its ability to recharge the battery and supply power to electrical accessories. The wiring harness, fuses, and circuit breakers protect the electrical system from overloads and short circuits. Regular maintenance of the electrical system, including checking the battery terminals for corrosion, inspecting wiring for damage, and replacing blown fuses, is essential for preventing electrical problems and ensuring reliable operation. Always disconnect the battery before performing any electrical repairs to prevent accidental shocks or damage to the system.

Dimensions and Weights

Understanding the dimensions and weights of the John Deere 5720 is crucial for transport, storage, and operation in various environments. The overall length, width, and height of the tractor determine its maneuverability in confined spaces and its suitability for specific tasks. The wheelbase, which is the distance between the front and rear axles, affects the tractor's stability and turning radius. The ground clearance, which is the distance between the lowest point of the tractor and the ground, determines its ability to operate in uneven terrain.

The tractor's weight, both unladen and with ballast, influences its traction and stability. Ballast can be added to the front or rear of the tractor to improve traction in challenging conditions. The tire sizes and configurations also affect the tractor's overall dimensions and performance. Understanding these dimensions and weights is crucial for selecting the appropriate implements and attachments, ensuring safe and efficient operation, and complying with transportation regulations. Always refer to the operator's manual for the exact dimensions and weights of your specific tractor configuration.

Parts Information

Parts Ordering

Ordering the correct replacement parts for your John Deere 5720 is crucial for ensuring proper maintenance and minimizing downtime. Always have your tractor's serial number readily available when contacting your local John Deere dealer or visiting their online parts catalog. This serial number helps the dealer identify the exact model and configuration of your tractor, guaranteeing that you receive parts specifically designed for it. Provide a clear and concise description of the part you need, including its function and location on the tractor. If possible, take a picture of the damaged or worn part, as this can be invaluable in helping the parts specialist quickly locate the correct replacement. Remember, using genuine John Deere parts is always recommended as they are engineered to meet the tractor's original specifications and performance standards.

Several options exist for ordering parts. The most reliable method is through your authorized John Deere dealer. They possess the expertise and access to the complete parts catalog. You can also utilize John Deere's online parts catalog, accessible through their website. This resource allows you to search for parts by model number or part name, view detailed diagrams, and place orders directly. When ordering online, double-check the part number and quantity before finalizing your purchase. Furthermore, confirm the dealer's return policy in case the ordered part is incorrect or unsuitable for your needs. Always keep records of your orders, including part numbers, quantities, and order confirmation details, for future reference and warranty claims.

Parts Diagrams

Understanding parts diagrams is essential for efficient troubleshooting and parts identification. These diagrams provide exploded views of tractor components, illustrating the relationships between individual parts within an assembly. Typically, each part is assigned a reference number that corresponds to a specific entry in the parts list associated with the diagram. These reference numbers are critical for precisely identifying the part you need when placing an order. Learning to interpret these diagrams can save you significant time and effort when diagnosing mechanical problems and sourcing the appropriate replacements.

John Deere provides comprehensive parts diagrams through its online catalog and dealer network. When accessing a diagram, pay close attention to the annotations and labels, which often provide important details regarding part orientation, assembly procedures, and potential issues. Some diagrams may include torque specifications for bolts and fasteners, ensuring proper installation. It's also worth noting that different versions of the 5720 tractor may have slightly different parts configurations, so verifying the diagram corresponds to your specific tractor's serial number is paramount. Familiarize yourself with the various diagram conventions and symbols to effectively navigate and extract the necessary information for parts identification and ordering.