John Deere 647 Rotary Cutter Manual: A Comprehensive Guide

Safety First

General Safety Information

Operating and maintaining your John Deere 647 rotary cutter requires a deep understanding of safety procedures. Neglecting these procedures can lead to serious injury or even death. Before operating or performing any maintenance on the cutter, meticulously read and understand the entire operator's manual, including all safety warnings and instructions. Pay particular attention to areas concerning potential hazards and how to avoid them. Regularly review the manual to refresh your knowledge and ensure you are always operating the machine in the safest possible manner. Remember, safety is paramount and starts with knowledge.

Never allow anyone to operate the rotary cutter who has not been thoroughly trained on its safe operation and maintenance. Ensure that operators are familiar with all controls, settings, and potential hazards associated with the machine. It's crucial that they understand the importance of using the correct tools and following proper procedures when performing maintenance. Keep children and bystanders away from the operating area at all times. Maintaining a safe operating environment is crucial, and this includes ensuring that anyone interacting with the machine is adequately trained and aware of potential dangers. This also includes understanding the capabilities and limitations of the machine so it is not operated in a manner that may cause issues.

Safety Decals and Locations

Your John Deere 647 rotary cutter is equipped with safety decals strategically placed to alert you to potential hazards. Familiarize yourself with the location and meaning of each decal. If a decal is damaged, missing, or illegible, replace it immediately. These decals provide crucial warnings that can prevent accidents. They often highlight specific dangers associated with particular components or operations, such as rotating parts or pinch points. Taking the time to understand these warnings and maintain the decals in good condition is a critical aspect of safety.

Regularly inspect the safety decals for damage or fading. Clean them as needed to ensure they are easily visible. If you need to replace a decal, order the correct replacement part from your John Deere dealer. When installing a new decal, ensure the surface is clean and dry. Follow the instructions provided with the replacement decal for proper placement and adhesion. By maintaining the safety decals, you're reinforcing important safety reminders that can significantly reduce the risk of accidents.

Personal Protective Equipment (PPE)

Always wear appropriate personal protective equipment (PPE) when operating or maintaining the rotary cutter. This includes safety glasses or a face shield to protect your eyes from flying debris. Wear sturdy, closed-toe footwear to protect your feet from injury. Hearing protection is also essential, especially during extended periods of operation, to prevent noise-induced hearing loss. Gloves can provide additional protection for your hands when handling tools or performing maintenance. Using the correct PPE can prevent injuries and protect your long-term health. Make sure that your PPE is also in great condition and replace it if you notice any damage.

Select PPE that is specifically designed for the tasks you are performing. Ensure that safety glasses meet ANSI Z87.1 standards and provide adequate protection from impact and debris. Choose gloves that offer a good grip and protect your hands from cuts and abrasions. Inspect your PPE before each use for any signs of wear or damage. Replace worn or damaged PPE immediately. Proper use and maintenance of PPE are essential for minimizing the risk of injury during operation and maintenance.

Operating Safety

Before operating the rotary cutter, thoroughly inspect the area for any obstacles, such as rocks, debris, or hidden objects. Clear the area as much as possible to prevent damage to the cutter and reduce the risk of flying projectiles. Ensure that all shields and guards are in place and properly secured. Never operate the cutter with missing or damaged safety devices. These guards are in place to prevent projectiles from impacting the operator or bystanders. It is also important to look for any buried debris that may be located in the area as the rotary cutter could dislodge these items.

Operate the cutter at a safe speed and be aware of the terrain conditions. Avoid operating on steep slopes or uneven ground that could cause the tractor to tip over. When transporting the cutter on public roads, follow all traffic laws and use appropriate warning devices, such as flashing lights and reflective markers. Be extra cautious when approaching intersections or turning corners. Ensure that the cutter is properly secured for transport and that it does not obstruct your view. By following these guidelines, you can minimize the risk of accidents and ensure a safe operating environment.

Never make adjustments or perform maintenance on the cutter while it is running. Always shut off the tractor engine, engage the parking brake, and remove the key before attempting any repairs or adjustments. Wait for all moving parts to come to a complete stop. Disconnect the PTO shaft to prevent accidental activation. Follow lockout/tagout procedures to ensure that the machine cannot be started unintentionally during maintenance. Taking these precautions is crucial for preventing serious injuries during maintenance and repair.

Understanding Your 647 Rotary Cutter

Key Features and Components

The John Deere 647 Rotary Cutter is a robust and reliable piece of equipment designed for maintaining pastures, cutting overgrown vegetation, and tackling general brush clearing. Familiarizing yourself with its key features and components is crucial for safe and effective operation. At the heart of the cutter lies the gearbox, a heavy-duty unit responsible for transferring power from the tractor's PTO to the blades. Inspect the gearbox regularly for proper lubrication levels and any signs of leakage, ensuring its longevity. The cutter deck, typically constructed from heavy-gauge steel, provides a protective shield for the internal components and withstands the impact of debris. Blade carriers, also known as stump jumpers, protect the gearbox from shock loads and obstacles. Also, the driveline that connects the tractor to the gearbox needs to be maintained.

The 647 Rotary Cutter utilizes swinging blades, designed to retract upon impact with hard objects, minimizing damage to the cutter and preventing dangerous projectiles. These blades require regular inspection for sharpness, wear, and damage. Dull or damaged blades reduce cutting efficiency and increase stress on the equipment. The tail wheel assembly, located at the rear of the cutter, helps to maintain a consistent cutting height and prevents the cutter from scalping the ground. The tail wheel should be properly inflated and free to swivel, ensuring smooth operation. Adjustable skids along the sides of the deck help to control cutting height and protect the deck from damage. Understanding the function of each component will empower you to perform routine maintenance and troubleshoot potential issues efficiently.

Intended Use and Limitations

The John Deere 647 Rotary Cutter is primarily intended for cutting grass, weeds, and light brush on pastures, fields, and roadside areas. Its design allows for efficient clearing of vegetation up to a certain diameter, generally specified in the operator's manual. Attempting to cut material exceeding this diameter can lead to equipment damage and potential injury. Understanding the machine's limitations is crucial for safe and productive operation. Remember that the 647 is not a forestry mulcher and should not be used for felling trees or clearing dense forests. Such use will void warranties and significantly reduce the lifespan of the cutter.

While the 647 is capable of handling uneven terrain, extreme slopes and obstacles should be avoided. Operating on steep inclines can compromise stability and increase the risk of rollover. Before operating, thoroughly inspect the area for hidden obstacles such as rocks, stumps, and buried objects. These hazards can damage the blades, the deck, and potentially cause the cutter to launch debris. Always operate the cutter at the recommended PTO speed and ground speed, as specified in the operator's manual. Excessive speeds can overload the machine and compromise safety. Never operate the cutter with anyone nearby, especially children. Thrown objects can cause serious injury or death.

Serial Number Location and Identification

The serial number is the unique identifier for your John Deere 647 Rotary Cutter, and it's essential for ordering replacement parts, accessing technical information, and verifying warranty coverage. Typically, the serial number is stamped on a metal plate affixed to the cutter deck, usually near the gearbox or on the side of the frame. This plate may also contain other important information, such as the model number and date of manufacture. Recording the serial number in a safe place, such as your operator's manual or a digital record, will save you time and effort in the future. Always refer to the serial number when communicating with your John Deere dealer or service technician to ensure accurate identification of your specific model.

Understanding the serial number format can also provide valuable information. The serial number typically consists of a combination of letters and numbers, with each section representing specific details about the machine. For example, certain digits may indicate the year of manufacture, while others identify the specific factory where the cutter was assembled. While the exact format may vary depending on the year and model, your John Deere dealer can provide clarification if needed. In addition to the serial number plate, it's also advisable to check your purchase invoice and other ownership documents for verification. Keep these documents organized and readily accessible for future reference.

Pre-Operation Checks

Inspection Checklist

Before operating your John Deere 647 Rotary Cutter, a thorough inspection is absolutely crucial to ensure safe and efficient operation. This preventative measure can save you significant time and money in the long run by identifying potential problems before they escalate into major repairs. Start by visually inspecting the entire cutter for any signs of damage, including cracks, dents, or worn parts. Carefully examine the welds for any fractures and ensure all guards are securely in place. Don't neglect checking the tires for proper inflation and any signs of wear or damage, as underinflated or damaged tires can significantly affect performance and safety.

Lubrication Points and Procedures

Proper lubrication is paramount to the longevity and performance of your rotary cutter. Consult your John Deere 647 Rotary Cutter owner's manual to identify all lubrication points. These typically include gearbox fittings, driveline U-joints, and pivot points. Use a high-quality grease specifically formulated for agricultural equipment, as this type of grease is designed to withstand the demanding conditions and heavy loads encountered during operation. Apply grease until fresh grease appears, indicating that old grease and contaminants have been purged from the bearing surfaces. Regular lubrication minimizes friction, reduces wear, and prevents premature failure of critical components.

Blade Condition and Tightness

The blades are arguably the most critical components of your rotary cutter, directly impacting its cutting performance and overall safety. Before each use, meticulously inspect the blades for sharpness, cracks, chips, or excessive wear. Dull blades reduce cutting efficiency, increase fuel consumption, and place undue stress on the cutter and tractor. Worn or damaged blades can become projectiles, posing a serious hazard to yourself and others. Ensure all blade bolts are tightened to the manufacturer's specified torque to prevent loosening during operation. Replace any damaged or excessively worn blades immediately to maintain optimal performance and safety.

Driveline Inspection and Maintenance

The driveline, also known as the PTO shaft, transfers power from the tractor to the rotary cutter. A properly functioning driveline is essential for safe and efficient operation. Before each use, inspect the driveline for any signs of wear, damage, or misalignment. Ensure all driveline shields are in place and securely fastened, as these shields provide critical protection against entanglement with moving parts. Check the driveline slip clutch or shear bolt for proper function and lubrication. A malfunctioning slip clutch or shear bolt can lead to serious damage to the cutter and tractor. Lubricate the driveline telescoping sections and U-joints according to the manufacturer's recommendations to prevent corrosion and ensure smooth operation.

Operating Instructions

Attaching the Cutter to the Tractor

The John Deere 647 rotary cutter is designed for efficient mowing when properly attached to a compatible tractor. Before beginning, ensure your tractor is equipped with a Category 1 or 2 three-point hitch, depending on your specific 647 model and its configuration. Carefully inspect all hitch components on both the cutter and the tractor for any signs of wear, damage, or missing hardware. Never attempt to attach the cutter if you notice any issues, and consult your local John Deere dealer for replacement parts or professional assistance. Proper attachment is paramount to safe and effective operation, preventing potential damage to the equipment and ensuring operator safety.

Begin by backing the tractor up to the rotary cutter, aligning the tractor's lower hitch arms with the corresponding connection points on the cutter. Carefully raise the hitch arms to engage the lower pins, securing them with linchpins or appropriate retaining devices. Next, connect the top link of the tractor to the cutter's top link mounting point, adjusting the top link length to achieve the desired cutter angle relative to the ground. Finally, connect the PTO shaft, ensuring it is properly aligned and securely locked onto both the tractor's PTO and the cutter's input shaft. Remember to always disengage the PTO and shut down the tractor engine before attempting any adjustments or connections. Safety is always the top priority, and rushing this process can lead to serious injury.

Adjusting Cutting Height

Achieving the desired cutting height is crucial for maintaining healthy turf and preventing damage to the rotary cutter. The John Deere 647 allows for adjustable cutting heights, typically ranging from 1.5 to 9 inches, depending on the model and adjustment settings. These adjustments are made primarily through the rear wheel assembly. The rear wheel provides support and helps maintain consistent cutting height over uneven terrain. Adjusting the height involves either moving the wheel bracket or using spacers to raise or lower the wheel relative to the cutter deck. Make sure to consult your specific John Deere 647 model's operator's manual for the exact adjustment procedure and recommended height settings.

Before making any adjustments, ensure the cutter is resting on a level surface and is securely supported. Loosen the bolts or pins that secure the wheel bracket or spacers, as described in the manual. Raise or lower the wheel to the desired position, ensuring that both sides are adjusted equally to maintain a level cutting plane. Securely tighten all bolts or pins after making the adjustments. Test the cutting height by operating the cutter at a slow speed in a safe area. Re-adjust if necessary to achieve the perfect cut. Regularly checking and maintaining proper cutting height contributes to the longevity of the cutter and improves the quality of the mowing job.

Safe Operating Practices

Operating the John Deere 647 rotary cutter requires adherence to strict safety practices to prevent accidents and injuries. Before each use, thoroughly inspect the cutter for any signs of damage, loose parts, or worn components. Pay close attention to the blades, checking for sharpness, cracks, or bends. Ensure all guards and shields are in place and properly secured to prevent debris from being thrown. Clear the area of any obstacles, such as rocks, branches, or debris, that could be struck by the cutter and become projectiles. Always wear appropriate personal protective equipment (PPE), including safety glasses, hearing protection, and sturdy footwear, when operating the cutter.

Never allow anyone to be near the cutter while it is in operation. Maintain a safe distance from the cutter at all times, and be aware of your surroundings. Operate the cutter at a safe speed, taking into account the terrain and the density of the vegetation. Avoid operating the cutter on steep slopes or in areas where visibility is limited. Be extremely cautious when operating near fences, buildings, or other obstacles. If the cutter strikes an object, immediately disengage the PTO and shut down the tractor engine. Inspect the cutter for damage before resuming operation. Remember, safety is everyone's responsibility. By following these guidelines, you can ensure a safe and productive mowing experience.

Mowing Techniques for Optimal Performance

Employing proper mowing techniques will maximize the efficiency and effectiveness of your John Deere 647 rotary cutter. Start by planning your mowing pattern to minimize overlapping passes and ensure complete coverage. If possible, mow in straight lines, overlapping each pass by approximately one-third of the cutter's width. This will help prevent scalping and ensure a uniform cut. When mowing tall or dense vegetation, consider making multiple passes, gradually lowering the cutting height with each pass. This will reduce the strain on the cutter and prevent it from becoming clogged.

Vary your mowing pattern from time to time to prevent soil compaction and promote healthy turf growth. Avoid mowing when the grass is wet, as this can cause the cutter to clog and leave clumps of clippings. Sharpen the blades regularly to maintain a clean cut and reduce the power required to operate the cutter. Clean the cutter deck frequently to prevent the buildup of clippings and debris, which can reduce its efficiency and lead to corrosion. By following these mowing techniques, you can achieve optimal performance and maintain a healthy and attractive lawn or field. Careful maintenance coupled with effective mowing strategies will prolong the life of your John Deere 647 rotary cutter and ensure years of reliable service.

Maintenance and Service

Scheduled Maintenance Intervals

Maintaining your John Deere 647 Rotary Cutter is crucial for ensuring its longevity, optimal performance, and, most importantly, your safety. Following a strict schedule of maintenance tasks will prevent breakdowns, extend the lifespan of critical components, and minimize costly repairs down the line. Consult the maintenance schedule included with your cutter's original documentation for the precise intervals recommended by John Deere. Generally, maintenance tasks are categorized by hours of operation (e.g., every 8 hours, 50 hours, 250 hours, etc.), so keeping a log of your cutter's usage is highly recommended. Neglecting routine maintenance can lead to accelerated wear and tear, potentially compromising the integrity of the machine and creating a safety hazard.

Remember that operating conditions can significantly impact the frequency of maintenance required. Dusty or abrasive environments, for example, will necessitate more frequent lubrication and cleaning of components like bearings and the driveline. Similarly, heavy use or cutting thick vegetation may require more frequent blade inspections and sharpening. Be observant of any unusual noises, vibrations, or performance changes, as these could indicate a need for immediate maintenance, regardless of the scheduled interval. Proactive maintenance is always the best approach to preserving the value and functionality of your rotary cutter.

Lubrication Procedures

Proper lubrication is the lifeblood of your rotary cutter, minimizing friction, preventing wear, and dissipating heat within moving parts. The various lubrication points on your 647 Rotary Cutter are critical for smooth operation and the longevity of the machine. Consult your owner's manual for specific locations and the recommended types of grease or oil for each point. Typically, grease fittings are found on the gearbox, driveline slip joints, and any other rotating components or pivot points, like the tail wheel.

When applying grease, use a grease gun and pump slowly until fresh grease emerges from the bearing or joint. This ensures that old, contaminated grease is flushed out and replaced with clean lubricant. Be careful not to over-grease, as this can damage seals. For oil reservoirs, such as the gearbox, check the fluid level regularly using the dipstick provided. Add oil as needed, using the recommended type and viscosity. Always clean the grease fittings and the surrounding area before applying grease to prevent dirt and debris from entering the bearings. Following the lubrication schedule diligently will significantly reduce wear and tear, extending the life of your rotary cutter.

Blade Sharpening and Replacement

The blades are the workhorses of your rotary cutter, and their condition directly impacts the quality of cut and the efficiency of the machine. Dull or damaged blades require more power to operate, increasing fuel consumption and putting unnecessary strain on the cutter and the tractor. Regularly inspect the blades for signs of wear, such as rounding, chipping, or cracking. Sharpen the blades as needed, using a grinder or file, to maintain a sharp cutting edge. Ensure that the blades are balanced after sharpening to prevent vibration and excessive wear on the spindle bearings.

When sharpening, maintain the original blade angle and avoid overheating the metal, which can weaken it. If the blades are severely damaged, bent, or excessively worn, they should be replaced immediately. Always use genuine John Deere replacement blades or high-quality aftermarket blades that meet the original specifications. When replacing blades, ensure that they are properly installed and torqued to the correct specification, as loose blades can be dangerous. Check the blade bolts frequently and re-torque them as needed. Consistent blade maintenance will result in a cleaner cut, reduced wear on the cutter, and improved overall performance.

Gearbox Maintenance

The gearbox is a critical component of the rotary cutter, responsible for transmitting power from the driveline to the blades. Proper gearbox maintenance is essential for reliable operation and long-term durability. Regularly check the gearbox oil level using the dipstick and add oil as needed, using the recommended type and viscosity specified in your owner's manual. Inspect the gearbox for leaks, cracks, or other signs of damage. If you notice any leaks, address them promptly by replacing seals or gaskets as necessary.

Periodically, typically every few hundred hours of operation, the gearbox oil should be completely drained and replaced. This removes accumulated contaminants and ensures that the gears are properly lubricated. When changing the oil, inspect the old oil for metal shavings or other debris, which could indicate internal wear or damage. If you find excessive debris, consult a qualified mechanic for further inspection and repair. Keep the gearbox clean and free of debris to prevent overheating and premature wear. Regular gearbox maintenance will ensure smooth and efficient power transmission, extending the life of your rotary cutter.

Driveline Maintenance

The driveline connects the tractor PTO to the rotary cutter gearbox, transmitting power through a series of universal joints and slip clutches. Proper driveline maintenance is crucial for safe and reliable operation. Regularly inspect the driveline for signs of wear, damage, or corrosion. Pay close attention to the universal joints, ensuring that they are properly lubricated and free of play. The slip clutch, if equipped, should be adjusted periodically to prevent damage to the driveline and the rotary cutter in the event of an overload.

Lubricate the slip joints and universal joints with grease as recommended in your owner's manual. Check the driveline shields for damage and ensure that they are securely in place to protect yourself and others from rotating parts. If the driveline is damaged or worn, replace it immediately with a new one that meets the original specifications. Before each use, ensure that the driveline is properly connected to the tractor PTO and the rotary cutter gearbox and that all safety shields are in place. Regular driveline maintenance will prevent breakdowns, ensure safe operation, and prolong the life of your rotary cutter.

Troubleshooting

Common Problems and Solutions

Diagnosing and resolving issues with your John Deere 647 Rotary Cutter is crucial for maintaining its optimal performance and extending its lifespan. A systematic approach, starting with identifying the symptoms, can save valuable time and prevent further damage. Always begin by visually inspecting the entire machine, looking for obvious signs of wear, damage, or leaks. Refer to the operational instructions and ensure the cutter is being used within its design specifications, considering factors like cutting height, PTO speed, and material type. Maintaining detailed records of past issues and repairs can also provide valuable insights into recurring problems and potential solutions. Addressing minor issues promptly can prevent them from escalating into more significant and costly repairs.

Before undertaking any troubleshooting or repair work, ensure the rotary cutter is safely disengaged from the tractor and the PTO is switched off. Chock the wheels for added security, and disconnect the spark plug (for petrol engines) or battery (for diesel engines) to prevent accidental starting. Always wear appropriate personal protective equipment (PPE), including safety glasses, gloves, and hearing protection. Be mindful of the potential for stored energy in hydraulic systems and consult the safety guidelines in this manual before working on these components. Rushing the process can lead to errors and potential injuries, therefore prioritize safety above all else.

Blade Issues

Rotary cutter blades endure significant stress and wear, making them a frequent source of operational problems. Bent, dull, or damaged blades can lead to uneven cutting, increased vibration, and potential damage to the cutter deck. Regularly inspect the blades for cracks, chips, or excessive wear, paying particular attention to the cutting edges and the areas around the blade bolts. If a blade is significantly damaged, it should be replaced immediately to prevent further complications. Ensure replacement blades meet the exact specifications outlined in this manual to guarantee proper fit and performance.

Blade balancing is essential after sharpening or replacement to prevent excessive vibration. An unbalanced blade can place undue stress on the spindle bearings and gearbox, leading to premature failure. Use a blade balancer to ensure each blade weighs the same. When sharpening blades, maintain the original bevel angle to optimize cutting performance and reduce wear. Remember to always torque the blade bolts to the manufacturer's specifications, using a torque wrench to ensure proper tightness and prevent loosening during operation. Loose blades can be dangerous and lead to catastrophic damage.

Gearbox Problems

The gearbox is the heart of the rotary cutter's power transmission system, and any issues here can quickly render the machine inoperable. Common problems include oil leaks, overheating, unusual noises (grinding, clicking), and complete failure of the gearbox. Regularly check the gearbox oil level and condition, following the recommended maintenance schedule in this manual. Low oil levels can lead to increased friction and overheating, causing significant damage to the gears and bearings. Always use the recommended type and grade of oil, as specified by John Deere, to ensure proper lubrication and cooling.

If you suspect a gearbox problem, carefully listen for any unusual noises while the cutter is running (under no-load conditions). Grinding or clicking sounds may indicate worn or damaged gears, while a whining noise could suggest bearing issues. Overheating can be caused by low oil levels, contaminated oil, or excessive load. Inspect the gearbox housing for cracks or leaks, and address any leaks immediately to prevent further oil loss. Major gearbox repairs should be performed by a qualified technician with the necessary tools and expertise.

Driveline Issues

The driveline, consisting of the PTO shaft and associated components, transmits power from the tractor to the rotary cutter. Problems in this area can lead to power loss, vibration, and potential damage to both the tractor and the cutter. Regularly inspect the PTO shaft for damage, wear, and proper lubrication. Pay particular attention to the universal joints, ensuring they are free of play and well-greased. A lack of lubrication is a common cause of U-joint failure.

Verify that the PTO shaft is properly sized and shielded. An improperly sized shaft can cause excessive wear and potential failure. The shielding should be intact and functional to protect the operator from injury. Check the slip clutch or shear bolt mechanism, ensuring it's functioning correctly. These mechanisms are designed to protect the gearbox and driveline from overload, and if they are not working properly, serious damage can occur. Replace shear bolts with the correct grade and size as specified in the manual.

Hydraulic System Troubleshooting

While not all 647 Rotary Cutters utilize hydraulics, if yours does, maintaining the hydraulic system is paramount for proper operation. Common issues include leaks, slow response times, and complete failure of the hydraulic cylinders. Begin by visually inspecting all hydraulic lines, fittings, and cylinders for leaks. Tighten any loose fittings and replace damaged hoses or seals immediately. Contaminated hydraulic fluid is a major cause of system problems.

Check the hydraulic fluid level in the reservoir, ensuring it is within the recommended range. Low fluid levels can lead to cavitation and reduced system performance. If the hydraulic cylinders are slow to respond or fail to extend or retract fully, there may be air in the system. Bleed the system according to the manufacturer's instructions to remove any trapped air. If the problem persists, the cylinder seals may be worn or damaged and require replacement.

Parts Information

Parts Diagrams

Understanding the layout and assembly of the John Deere 647 Rotary Cutter is crucial for effective maintenance and repair. Parts diagrams provide a visual representation of each component, showcasing its location and how it interacts with other parts of the cutter. These diagrams are usually exploded views, which means the parts are shown slightly separated from one another in their relative positions. Consulting these diagrams helps you identify the correct part number, understand the order of assembly, and visualize how different sections of the rotary cutter work together, especially when dealing with more complex areas like the gearbox or the driveline.

Typically, parts diagrams are broken down by major assemblies within the rotary cutter. This might include separate diagrams for the deck, the gearbox, the tail wheel assembly, and the driveline. Each diagram will have corresponding callouts or numbers pointing to individual parts. This number system will then cross-reference with the parts list, providing the official part number and description for each component. Furthermore, diagrams can highlight common wear points or areas that require frequent inspection, serving as a valuable guide during routine maintenance procedures.

Parts List

The parts list is the companion to the parts diagrams, providing detailed information about each component of the John Deere 647 Rotary Cutter. Each part is listed with its corresponding number from the diagram, followed by a descriptive name, the official John Deere part number, and often, the quantity required for a particular assembly. This list is absolutely vital when ordering replacement parts or performing repairs. Using the correct part number ensures that you receive the correct replacement, preventing compatibility issues and ensuring proper functionality of the repaired section. Without it, you could receive the wrong part, damaging the machinery.

Beyond the basic identification, a good parts list may also include additional information such as superseded part numbers. This is especially helpful for older models where original parts may no longer be available. The superseded number indicates the current replacement part that is compatible with your model. Furthermore, some parts lists may include notes on specific installation procedures or any special tools that might be required for the replacement. Remember to also check the model number of the rotary cutter itself when consulting the parts list, as slight variations between models can sometimes mean different parts are required.

Ordering Information

Knowing the correct part number is only half the battle; you also need to know how to order the part! Ordering parts for your John Deere 647 Rotary Cutter is generally a straightforward process, thanks to the vast John Deere dealer network. The most common method is to visit your local John Deere dealership. The parts personnel can assist you in confirming the correct part number based on your model and can place the order for you, arranging for pickup or delivery. When ordering, always provide the full part number and a detailed description of the part to avoid any confusion.

Increasingly, online ordering is also becoming a popular option. The John Deere parts website offers a comprehensive parts catalog where you can search for parts by number, diagram, or model. You can also create an account and save your preferred dealer for easy ordering and shipping. Remember to double-check the shipping costs and delivery times when ordering online. No matter how you choose to order, always keep a record of your order confirmation, including the order number, part numbers, and estimated delivery date. This will allow you to track your order and resolve any potential issues quickly.

Storage

Preparing the Cutter for Storage

Properly preparing your John Deere 647 rotary cutter for storage is crucial to extending its lifespan and ensuring it's ready for reliable performance when you need it next season. Before storing the cutter, thoroughly clean the entire unit, removing any accumulated grass, mud, or debris. This prevents corrosion and allows you to inspect for any damage that needs attention. Pay particular attention to the underside of the deck, as this area is prone to accumulating debris. Use a pressure washer or a stiff brush to remove stubborn buildup, ensuring you get into all the nooks and crannies.

Next, carefully inspect all components for signs of wear, damage, or loose connections. Check the blades for sharpness and any signs of bending, cracking, or excessive wear. Sharpen dull blades or replace them if necessary to maintain optimal cutting performance. Inspect the driveline for any damage to the shields, slip clutch, or universal joints. Lubricate all grease fittings according to the maintenance schedule outlined in the owner's manual. This will prevent corrosion and ensure smooth operation of moving parts.

Finally, consider applying a rust preventative coating to exposed metal surfaces, especially in areas prone to corrosion. This is particularly important if you live in a humid climate or store the cutter outdoors. Coat the gearbox and any exposed bearings with a layer of grease to protect them from moisture. Disconnect the PTO shaft from the tractor and store it separately in a dry location. Doing so will help prevent accidental engagement and protect the shaft from the elements.

Storage Location Considerations

The storage location plays a significant role in preserving the condition of your John Deere 647 rotary cutter during the off-season. Ideally, store the cutter indoors in a dry, well-ventilated area, such as a shed or garage. This protects it from the elements, including rain, snow, sun, and extreme temperature fluctuations. These factors can accelerate corrosion, damage rubber components, and fade paint.

If indoor storage is not an option, choose an outdoor location that is as sheltered as possible. Cover the cutter with a waterproof tarp to protect it from rain and snow. Secure the tarp tightly to prevent it from blowing away in strong winds. Ensure that the tarp is breathable to allow for air circulation and prevent moisture from trapping underneath, which can lead to rust. Raising the cutter slightly off the ground using blocks or planks can also help prevent moisture damage and rodent infestations.

Regardless of whether you store the cutter indoors or outdoors, it's important to choose a location that is easily accessible when you need to use it again. Avoid storing it in a place where it will be difficult to maneuver or retrieve. Also, consider security. Choose a location that is less vulnerable to theft or vandalism. By carefully selecting the storage location and taking the necessary precautions, you can ensure that your John Deere 647 rotary cutter remains in good condition and ready for reliable performance for years to come.

Specifications

Dimensions and Weight

Understanding the dimensions and weight of your John Deere 647 rotary cutter is crucial for transportation, storage, and ensuring compatibility with your tractor. The overall width of the cutter is essential to know when navigating narrow paths or storing the equipment in limited space. The total weight influences the required horsepower of your tractor and impacts stability during operation, especially on uneven terrain. Always refer to the weight specifications to avoid overloading your tractor and ensure safe operation. Consulting these figures also aids in determining the appropriate trailer or truck for transporting the rotary cutter to different work sites.

Cutting Width and Height

The cutting width directly determines the swath cleared in each pass, influencing the efficiency of mowing operations. A wider cutting width allows for faster coverage of large areas. The cutting height, adjustable via skids or tail wheels, allows you to tailor the cut to specific vegetation types and desired stubble height. Proper adjustment of the cutting height is crucial for preventing scalping of the ground and minimizing stress on the blades. Varying the cutting height also optimizes the mulching effect, returning valuable nutrients to the soil as the chopped material decomposes.

Gearbox Specifications

The gearbox is the heart of the rotary cutter, responsible for transmitting power from the tractor's PTO to the rotating blades. Its specifications, including the horsepower rating and gear ratio, are vital for ensuring reliable performance and preventing premature wear. A properly sized gearbox is essential for handling the stresses imposed by heavy vegetation and extended operation. Overloading the gearbox can lead to overheating, bearing failure, and ultimately, complete failure of the unit. Regular inspection of the gearbox oil level and condition is crucial for maintaining its optimal performance and longevity.

Blade Specifications

The type, size, and weight of the rotary cutter blades directly impact cutting performance and overall efficiency. Different blade designs are available for various applications, such as brush hogging, pasture mowing, and roadside maintenance. Heavier blades provide increased inertia for cutting through tougher vegetation, while lighter blades may be more suitable for finer grasses. Understanding the proper blade sharpening techniques and replacement intervals is essential for maintaining a clean cut and reducing stress on the gearbox. Always use genuine John Deere replacement blades to ensure proper balance and compatibility with the rotary cutter's design, preventing potential damage and safety hazards.