GRAVELY PROTURN 60 Service Manual

Overview and scope

The GRAVELY PROTURN 60 is a commercial-grade lawn and grounds maintenance machine designed for consistent performance under demanding conditions. This manual section provides a clear, practical overview of the machine’s intended use, its core capabilities, and the general boundaries within which maintenance and repair should be conducted. It is written for professional technicians, fleet managers, and experienced operators who require precise guidance to ensure safe operation, reliable service, and extended equipment life. Understanding the scope helps technicians quickly identify applicable procedures and avoid unnecessary work on subsystems that are outside the device’s normal operating envelope. Familiarity with the overall purpose and applications of the ProTurn 60 helps teams plan routine maintenance schedules and troubleshoot common issues more efficiently.

The document is intended to support authorized service personnel and qualified operators by providing consistent, verifiable instructions that align with safety standards and manufacturer specifications. It covers routine inspection, preventive maintenance, minor and major repairs, and parts replacement within the context of professional use. The information is organized to facilitate quick reference in busy workshop environments, with emphasis on accuracy, safety, and traceability. By following the documented scope, technicians can maintain repair records, schedule downtime effectively, and communicate work performed with confidence to customers or supervisors. The material also serves as a foundation for diagnostic procedures that may require correlating performance data with maintenance history.

Document structure and navigation is designed to be intuitive for those who work with heavy machinery and commercial lawn equipment. Technical topics are presented in a logical sequence that mirrors the repair workflow: initial inspection, diagnostic checks, service interventions, and post-service testing. Each section includes safety notes, required tools, step-by-step procedures, and references to torque specs, lubrication points, and service intervals. While the manual is comprehensive, it remains practical by focusing on procedures that have direct impact on reliability and safety in real-world operations. Operators and technicians should familiarize themselves with the table of contents and indexing conventions to move swiftly between related procedures when diagnosing complex faults.

Because the ProTurn 60 may be used in a range of environments, the scope includes considerations for environmental conditions such as temperature, humidity, and exposure to debris. The guidelines emphasize correct disassembly and reassembly sequencing to prevent contamination, ensure proper alignment, and maintain calibration. It also addresses the importance of verifying protective guards, safety interlocks, and operator controls after maintenance work. Adherence to the documented scope helps ensure consistent service quality, minimizes downtime, and supports compliance with warranty and service standards across service centers.

The intended audience includes service technicians with foundational knowledge of gasoline engines, hydraulic systems, electrical wiring, and drive assemblies. It also encompasses shop supervisors who oversee maintenance programs, inventory control staff who manage parts and consumables, and field technicians performing on-site service. The material presumes access to standard hand tools, calibrated measurement devices, and manufacturer-approved lubricants and replacement parts. Where applicable, it references safety procedures and personal protective equipment appropriate for the tasks described, reinforcing a culture of safe, professional workmanship.

In summary, this section defines the purpose, audience, and navigational approach of the GRAVELY PROTURN 60 Service Manual. It establishes the boundaries of the manual’s applicability, ensuring readers can determine when to apply the documented procedures and how to locate related information efficiently. The combination of clear scope statements and practical navigation guidance supports accurate diagnostics, effective maintenance planning, and the consistent delivery of high-quality service for ProTurn 60 equipment.

Safety and compliance

Personal protective equipment (PPE) is essential for preventing injury during service, maintenance, and operation of the Gravely ProTurn 60. Operators should wear ANSI-compliant eye protection, hearing protection appropriate for the expected noise levels, and cut- or impact-resistant gloves for handling sharp edges and hot surfaces. A flame-resistant long-sleeve shirt and pants, along with sturdy non-slip footwear, are recommended to guard against fuel spills, chemical exposure, and limited mobility hazards. It is also wise to have a durable, flame-resistant outer layer when working in environments with potential fire or spark risks. Ensure PPE is properly fitted, undamaged, and readily available before starting any service task to maintain consistent protection throughout the workday.

Hazard assessment and mitigation begins with a thorough review of the work area to identify potential risks such as fuel leaks, moving parts, hot surfaces, and electrical connections. Before any procedure, inspect guards, shields, and safety devices to verify proper function and integrity. Document environmental conditions that could affect safety, including poor lighting, wet floors, or the presence of bystanders. Develop a control plan that prioritizes minimizing exposure to hazards, such as de-energizing systems before maintenance and isolating energy sources to prevent unexpected startup. Communicate the plan to all team members if working in a crew, and re-evaluate the hazards if the scope of work changes.

Lockout tagout procedures are critical for preventing accidental machine startup during maintenance on the Gravely ProTurn 60. Identify all energy sources, including electrical, hydraulic, and fuel systems, and isolate them using approved lockout devices. Place a clearly written tag on each energy source indicating the responsible person, date, and nature of the maintenance activity. Verify zero energy by attempting to start the engine and by performing a safe release test where applicable, following the manufacturer’s specified verification steps. Never defeat or bypass lockout devices, and maintain locked-out status until all maintenance tasks are completed and the area is declared safe by the authorized person. When multiple technicians are involved, ensure each person applies their own lockout, and never remove another person’s lock until their tasks are finished and the area is confirmed safe.

Gravely ProTurn 60 overview

The Gravely ProTurn 60 is a commercial-grade riding mower designed for professional landscape operations and heavy-duty lawn maintenance. It combines robust construction with precise control systems to deliver dependable performance in demanding conditions. The machine features a wide cutting deck and a durable chassis that supports extended use times, enabling operators to cover large properties efficiently. Understanding the core design and intended use helps technicians perform accurate diagnostics, routine maintenance, and timely repairs to minimize downtime. This overview provides foundational knowledge for service technicians tasked with keeping the ProTurn 60 in peak operating condition.

Machine description and specifications: The ProTurn 60 is equipped with a 60-inch cutting deck, designed for high productivity while maintaining cut quality. It incorporates a heavy-duty drive system, spill-resistant spline joints, and reinforced compliance with commercial mowing standards. The operator platform is built for comfort and longevity, offering ergonomic seating, straightforward control levers, and accessible maintenance points. The machine runs on a fuel-efficient engine matched to the mower’s hydraulic and drive requirements, ensuring consistent power delivery during long shifts. Precision engineering in the steering and traction systems provides reliable maneuverability on varied terrains found on professional properties. Overall dimensions, weight, and payload capacities are documented to guide safe transport, storage, and service access during maintenance intervals.

Key components and systems: The powertrain comprises a reliable engine, a hydrostatic transmission, and a robust belt or shaft-driven cutting system depending on model variation. Hydraulic circuits control the deck lift, blade engagement, and related actuators, with built-in relief valves and filter housings to protect sensitive components. The cutting deck includes multiple blades, a spindle assembly, and a belt-driven or direct-drive interface that maintains blade speed under load. Electrical systems cover the safety interlocks, dashboard indicators, charging, and lighting circuits, with fuses and relays positioned for rapid diagnostics. The cooling system, fuel system, and exhaust arrangement are designed to withstand continuous operation, while filtration and lubrication provisions support component longevity. Regular inspection of belts, belts tensioners, guards, and blade bolts is essential to preserve performance and safety.

Serial number and model identification: The serial number is typically located on a visible placard near the operator platform or on the right rear frame rail, enabling technicians to verify the exact configuration and production date. Accurate model identification is critical for selecting the correct replacement parts, service bulletins, and compatibility with aftermarket updates. When recording service data, include the serial number, model designation, and any optional equipment installed, as these details influence recommended maintenance intervals and part numbers. For warranty considerations, ensure that the documented serial number aligns with the original purchase records and service history. In routine maintenance and repair workflows, confirming the model and serial information helps prevent incorrect parts installation and reduces the likelihood of rework due to misidentification.

Maintenance procedures

The Gravely ProTurn 60 requires a structured approach to upkeep to ensure consistent performance and reliable operation. Preventive maintenance should be scheduled based on hours of operation, operating conditions, and environmental factors, with more frequent checks in dusty or harsh environments. Establish a documented routine that includes visual inspections, fluid level checks, and component functionality tests. Maintaining a log of completed tasks helps track wear patterns and anticipate parts replacement before failures occur. A calm, methodical cadence for maintenance reduces downtime and extends the service life of the machine.

Preventive maintenance should begin with a thorough exterior inspection, looking for loose fasteners, damaged guards, or signs of fluid leaks. Check the engine compartment, drive system, and deck area for debris buildup that could impede cooling or airflow. Before performing any service, ensure the machine is parked on a level surface, the ignition is off, and components are depressurized where applicable. Document any irregularities and address them promptly to prevent escalation. Regularly reviewing the maintenance schedule helps keep all critical systems in alignment with manufacturer specifications.

Lubrication and oiling points must be treated as a core routine to minimize friction and wear. Apply the recommended lubricants to pivot points, linkages, and bearings as specified in the service data. Do not over-lubricate, and wipe away excess to prevent dirt attraction. Check grease fittings and lubricant reservoirs for contamination and seal integrity, replacing seals if necessary. Maintain a clean working environment when servicing lubrication points to avoid contaminant ingress, which can accelerate wear and reduce system efficiency.

Air filter and cooling system care are essential for maintaining engine performance and longevity. Inspect the air filter element for dirt, tears, or saturated media, and replace it at the recommended intervals or sooner under heavy load conditions. Clean the filter housing to remove dust and debris before reassembly. Ensure the cooling fins and radiator surfaces are clear of obstructions and wash them with appropriate cleaners if permitted by the manufacturer. Proper cooling minimizes engine heat buildup, which translates to steady performance and extended engine life during peak mowing or professional use.

Fuel system inspection and service should focus on fuel quality, line integrity, and fuel delivery components. Check fuel lines for cracks, stiffness, or leaks and replace compromised sections promptly. Inspect the fuel filter and replace it according to the service schedule or if fuel delivery shows signs of restriction. If the machine experiences hard starting, rough running, or reduced power, perform a diagnostic check on the fuel system, including the pump, injectors, and lines, to identify any blockages or air ingestion issues. Use only the recommended fuel grade and additives as specified by the manufacturer to preserve fuel system reliability.

Electrical system inspection involves a careful review of the wiring, connectors, and battery health. Inspect for signs of corrosion, broken insulation, or loose connections, and correct issues with the proper crimping and replacement of damaged components. Test the battery voltage, charge state, and alternator output if applicable, replacing aging batteries to prevent unexpected failures. Check all safety interlocks, switches, and gauges to ensure accurate readings and reliable machine operation. Regular electrical checks help prevent intermittent faults that can disrupt operations and compromise safety on the job site.

In all maintenance activities, use the recommended tooling and de- energize electrical systems as required by the manual. Adhere to manufacturer torque specifications for fasteners and use the correct lubricants and filters for each subsystem. Dispose of used fluids and contaminated components in accordance with local environmental regulations. Creating a standardized maintenance routine that covers preventive checks, lubrication, filter care, fuel system health, and electrical integrity will optimize performance, reduce downtime, and extend the service life of the Gravely ProTurn 60.

Diagnostics and troubleshooting

Gravely ProTurn 60 owners occasionally encounter performance issues that are not immediately obvious. Common symptoms include loss of cutting efficiency, unusual engine noises, hard starting, poor halt or engage behavior, and excessive vibration during operation. For each symptom, it is important to consider multiple probable causes rather than jumping to conclusions. A systematic approach helps ensure that the root issue is identified without unnecessary component replacement. Document any recent maintenance or environmental conditions that could influence the machine’s performance, such as blade height changes, fuel quality, or exposure to extreme temperatures.

Common symptoms and probable causes often center on fuel, air intake, ignition, and component wear. If the engine runs roughly or lacks power, check for dirty air filters, clogged fuel injectors, or a fouled spark plug. A mower that won’t start or stalls under load may indicate stale fuel, a weak spark, or a restricted exhaust. If cutting performance diminishes, inspect blade sharpness and balance, blade spindle wear, and belt tension. Excessive vibration can point to imbalanced blades, loose mounting hardware, or worn spindle assemblies. Addressing these areas first can prevent unnecessary downtime and help preserve the life of critical components.

Diagnostic procedures and tools should be methodical and repeatable. Begin with a visual inspection for obvious damage, leaks, or loose fasteners. Use a diagnostic spark tester to confirm ignition spark strength, and inspect the air intake system for obstructions. Employ a fuel sample to assess ethanol content and overall quality, and perform a compression check if engine performance remains suspect after basic cleaning. When evaluating cutting performance, measure blade runout with a dial indicator and verify spindle bearings for smooth rotation and absence of play. Keep a detailed log of findings, steps taken, and observed results to guide subsequent decisions and verify that the issue has been resolved after repairs.

Replacement part identification and sourcing involves cross-referencing the model’s specific parts catalogs and service manuals. Start by confirming the exact engine model, deck size, and transmission type, then locate parts with matching serial numbers where applicable. For worn or damaged components such as spark plugs, air filters, fuel filters, belts, blades, or spindle bearings, prefer OEM parts or certified equivalents to preserve reliability and performance. When sourcing replacement items, consider retaining a maintenance kit that includes the most frequently replaced items for the Gravely ProTurn 60. It is prudent to check warranty status and return policies before purchasing, particularly for high-cost items like engine components or transmission parts. Always document the part numbers and supplier details to streamline future maintenance and troubleshooting efforts.

Repair procedures

The GRAVELY PROTURN 60 is a compact, purpose-built tool designed for durable field use, and proper repair procedures are essential to maintain its reliability and safety. Begin any service by performing a thorough visual inspection to identify worn or damaged components, loose fasteners, and signs of fluid leaks. Always disconnect the battery and isolate the ignition system before handling electrical components or fuel lines to prevent accidental starts. Maintain a clean workspace and organize fasteners in labeled trays to ensure accurate reassembly and to prevent mismatches during the process. When removing major assemblies, document the routing of hoses and wiring with labeled photos or notes to simplify subsequent reassembly and to preserve correct torque sequences and alignment. Use OEM-recommended lubricants and sealants, and replace gaskets and seals whenever a component is disassembled. Adhere to established torque specs and service manuals to avoid over-tightening or under-tightening critical fasteners that could compromise performance or safety. Keep a detailed service log noting parts replaced, measurements taken, and any adjustments made for future maintenance reference.

Disassembly and reassembly guidelines require careful separation of subassemblies without damaging mating surfaces or harnesses. Start by removing the battery, seat, and any access panels to gain clear access to the engine, drive, and electrical system. When separating the engine from the chassis, support the assembly with appropriate lifting equipment and use drift pins or alignment dowels to maintain precise alignment during reassembly. During disassembly, label each wiring harness and connector, noting any color-coding or unique housings that could affect correct reconnection. Inspect internal components such as air filters, fuel filters, and cooling fins for debris, wear, or contamination, and replace or clean them as needed. Reassembly should follow the reverse order of disassembly, ensuring that all fasteners are torqued to specification and that electrical connections are seated fully with locking mechanisms engaged. After reassembly, perform a functional test at idle and under load to verify operation, listening for abnormal noises, vibrations, or warning indicators that could signal incorrect assembly or lingering faults.

Engine removal and installation demand precise isolation of fuel lines, electrical leads, and mounting hardware. Before removal, disconnect the negative battery cable and relieve fuel pressure if applicable, then drain the fuel system as required by the model’s guidelines. Support the engine with a hoist or support stand and detach mounting hardware in a cross-pattern sequence to minimize stress on the engine mounts. When installing the engine, ensure that cooling ducts, exhaust connections, and intake plumbing are correctly aligned and secured, with gaskets and seals replaced if degraded. Verify that the flywheel and timing marks align according to the manufacturer’s specifications, and rotate the engine by hand to confirm smooth operation before applying any electrical power. After installation, check all related systems, including fuel, ignition, and cooling, for leaks or interference, and perform a comprehensive test run under varying load conditions to ensure stability and proper response.

Drive system service and adjustment focus on ensuring smooth engagement and accurate speed control. Inspect drive belts or chains for wear, cracks, or glazing, and replace them if necessary to prevent slippage and loss of performance. Check tension or alignment adjustments as specified for the PROTURN 60, and adjust sheaves, belts, or chains to achieve the correct tension range without overloading the drive components. Inspect pulleys, idlers, and sprockets for signs of wear, grooves, or missing teeth, and replace any damaged parts to prevent drive failure. Ensure the drive system alignment remains true by checking belt tracks, shims, and mounting brackets after any service work. Finally, verify the braking or stopping system’s function where applicable, confirming that safety interlocks and control levers operate smoothly and return to their at-rest positions without sticking.

Electrical harness repair and continuity testing require meticulous tracing of circuits and secure harness routing. When a harness fault is suspected, inspect connectors for corrosion, bent pins, or damaged housings, and clean or replace as needed. Use a multimeter to verify continuity between key terminals, and document any resistance readings that fall outside manufacturer specifications. Damaged insulation or exposed conductors should be repaired with heat-shrink tubing or protective sleeves, and damaged harness sections should be replaced rather than repaired with temporary solutions. Re-route harnesses away from hot surfaces, moving parts, or sharp edges, and secure with tie wraps or clamps that maintain position without causing abrasion. After completing electrical repairs, perform a thorough electrical system check, including battery charging, ignition, fuel sensors, and any auxiliary circuits, to ensure that all circuits operate correctly and safely under normal operating conditions.

The GRAVELY PROTURN 60 requires regular evaluation of safety systems to ensure dependable operation and operator protection. Begin with a comprehensive visual inspection of all safety interlocks, blade kill switch, and seat switch, confirming that they engage and disengage correctly. Test the operator presence controls by attempting to start the engine with the safety devices bypassed, ensuring the unit does not operate when any safety feature is compromised. Verify that all warning decals are legible and in the proper location, and replace any damaged labels. Confirm that the roll bar or canopy (if installed) remains secure and undamaged, and inspect shielding around the cutting deck to prevent accidental contact. Document any anomalies and address them before proceeding with further adjustments.

Steering and drive belt tensioning are critical for predictable handling and efficient power transfer. Inspect the drive belt for wear, cracks, glazing, or fraying, and replace as necessary following the manufacturer’s recommended service intervals. Check belt tension according to the prescribed method, ensuring there is proper deflection at the specified points without excessive tension that could shorten belt life. Examine pulleys, idlers, and tensioners for smooth operation and absence of side-to-side play. If the steering system exhibits looseness or drift, measure toe-in and toe-out using the established reference marks and adjust the steering linkage until alignment is within factory tolerance. After adjustments, recheck belt tension and road-test the machine to confirm consistent steering response and acceleration.

Steering linkage and wheel alignment require precise measurement to ensure optimal tracking and reduced tire wear. Inspect tie rods, tie rod ends, and linkage joints for play, wear, or damage, replacing any compromised components. Verify that the steering wheel or lever returns to the centered position without binding, and that the steering locks engage and release properly. Use a known-good alignment procedure to set wheel alignment, confirming that wheels point straight ahead when the steering is centered and that any adjustable toe or camber settings are within the specified range. Re-torque all fasteners to the recommended values after alignment, and perform a cautious test drive to evaluate steering fidelity, tracking, and stability on varied terrain.

Cutting and deck adjustments impact cut quality, mower effectiveness, and safety. Begin by inspecting the deck for balance, ensuring the spindle housings are level and free from excessive runout. Check blade adapters, bolts, and spindle belts for wear and secure fastening; replace any worn components and torque bolts to the manufacturer’s specification. Measure deck height and ensure consistent engagement across all four corners, adjusting the height-of-cut linkage and deck rollers as required. Verify that anti-scalp wheels operate smoothly and do not contact the ground during operation. Finally, perform a test cut on a flat surface, observe clip quality, and adjust blade pitch and cutting height to achieve a uniform, even cut with minimal vibration.

Winterization and storage of the GRAVELY PROTURN 60 require a methodical approach to prevent corrosion, degradation, and starting issues when the unit is returned to service. Begin with a thorough pre storage inspection to identify any worn, loose, or damaged components that could worsen during storage. Check all mounting bolts, belts, and guards for tightness and integrity, and replace or repair any parts that show signs of excessive wear. Inspect the engine area for oil leaks, fuel leaks, and coolant levels if applicable, addressing any leaks before the equipment is put away. Ensure that the machine is clean and free of dirt, grass, and debris that can retain moisture and promote rust formation over the off-season. Document any issues found so you have a clear plan for addressing them prior to the next use cycle.

Fuel stabilization and moisture management are critical to keeping the engine ready for operation after storage. Add a suitable fuel stabilizer to the tank and run the engine for several minutes to ensure stabilized fuel circulates through the system, including the carburetor or fuel injectors. If the fuel system is suspected of having moisture, drain the fuel from the tank and carburetor and refuel with fresh stabilized fuel before storage. In climates with high humidity, consider using a fuel stabilizer with corrosion inhibitors to protect metal components inside the fuel system. Store the machine in a cool, dry location away from direct sunlight to minimize chemical degradation of gaskets and hoses. Do not store with open fuel containers or near sources of heat, which can accelerate fuel deterioration.

Battery care and charging are essential to ensure reliable starting after a period of inactivity. Remove the battery from the machine if it will be stored for an extended time, and place it on a maintenance charger or trickle charger designed for the battery type to maintain a full charge. Clean any corrosion from terminals and connectors before storage, applying a light dielectric grease to prevent further oxidation. If the battery remains in the machine, disconnect the negative and positive terminals to reduce the risk of parasitic drain. Store the battery in a cool, dry place where temperatures remain within the manufacturer’s recommended range, and periodically check the charge level according to the charger’s guidelines. For maintenance-free or sealed batteries, follow the manufacturer’s recommendations for long-term storage and refresh charging as needed.

Protective storage practices help preserve the machine’s condition and readiness for use. Cover the equipment with a breathable outdoor cover to protect it from dust, moisture, and theft, while allowing any residual humidity to escape. Elevate the unit off concrete or damp surfaces using blocks or stands to prevent chassis and water intrusion, which can promote corrosion. Apply a light coat of protectant or rust-inhibiting spray to metal surfaces, avoiding intake openings and moving parts, to minimize surface oxidation during storage. Keep the mower in a well-ventilated area with adequate air circulation to reduce moisture accumulation, and inspect storage surroundings for pests that could cause damage to wires or hoses. Schedule a mid-winter check to confirm that no unexpected leaks or deterioration occurred during storage, ensuring the machine remains in a deployable condition when the season resumes.

Specifications and references

The GRAVELY PROTURN 60 is engineered to deliver reliable performance for commercial and professional lawn maintenance applications. Accurate specifications support proper maintenance, safe operation, and optimal service life. Engineers design the drive system, cutting deck, hydraulic controls, and electrical subsystems to meet demanding workloads while maintaining ease of serviceability. Keeping a current reference of torque tolerances, fastener sizes, and recommended lubricants helps technicians diagnose issues quickly and prevent recurring problems. Always verify that service tools and replacement parts meet or exceed the original equipment standards to preserve performance characteristics and warranty eligibility.

Torque and fastener chart: This section provides precise torque values for critical fasteners across the GRAVELY PROTURN 60. Adhering to these specifications reduces the risk of overtightening, which can strip threads or deform components, and under-tightening, which can lead to vibration, loosening, or structural failure. The chart commonly covers engine mounting bolts, deck assembly fasteners, wheel hubs, and linkage connections. When performing maintenance, consult the latest manufacturer documentation to confirm the applicable torque sequence and whether any fasteners require thread-locking compounds or anti-seize treatments. Documenting the torque applied during assembly helps technicians maintain consistency across service intervals and ensures repeatable performance on return to service.

Wiring diagrams overview: The electric and electronic systems in the GRAVELY PROTURN 60 are supported by organized wiring diagrams that illustrate routing, color codes, and connector types. A careful review of these diagrams before disassembly minimizes wiring errors and potential electrical faults. Pay particular attention to the harness routes around moving parts, heat sources, and vibration points to prevent insulation damage over time. When replacing components, match pinouts, grounding locations, and shielded cables to maintain electromagnetic compatibility and predictable sensor behavior. Regular verification of continuity and insulation resistance helps detect deteriorated wires before a failure occurs, contributing to safer operation and easier troubleshooting.

Lubricants and consumables list: Proper lubrication and timely replacement of consumables extend component life and reduce friction-induced wear. The service manual typically includes recommended lubricants for engine, transmission, deck spindle bearings, and hydraulic components, with specifications for viscosity, grade, and temperature range. Use OEM-approved products or equivalents that meet or exceed the original performance criteria, ensuring compatibility with seals and gaskets to prevent leaks. Consumables such as air filters, oil filters, fuel filters, belts, and drive tires should be scheduled for proactive replacement based on operating hours or usage conditions. Keeping a stocked list and order cadence helps minimize downtime during peak maintenance windows and preserves machine uptime for critical landscaping jobs.

Additional references: In addition to the core specifications, technicians should have access to service bulletins, parts catalogs, and safety notices issued by Gravely. Cross-reference part numbers for compatibility with different production runs or regional variations, and confirm any service recalls that may affect the PROTURN 60. A well-maintained service history, including dates of service, parts replaced, and observed symptoms, supports accurate fault isolation and planning for long-term reliability. When in doubt, contact authorized Gravely service providers or regional representatives to verify the applicability of guidance to the specific machine serial number and production year.