GRAVELY POWER BRUSH 28 Service Manual

Overview and safety

The GRAVELY POWER BRUSH 28 is a compact, heavy-duty power brush designed for efficient cleaning and debris clearing in demanding outdoor environments. It combines a armored protection system, a robust engine, and a high-torque drive mechanism to deliver consistent brushing performance under varied conditions. Proper understanding of its components and operating principles is essential to maximize efficiency while minimizing wear and potential hazards. Before performing any maintenance or operation, take a moment to review the safety features and emergency procedures specific to this model. Regular inspection of the drive belt, brush assembly, and safety shields helps prevent unexpected downtime and prolongs service life.

Safety first guidelines are the foundation of all work with the GRAVELY POWER BRUSH 28. Ensure that the machine is on a stable, level surface and that the ignition is in the off position before conducting any checks. Personal protective equipment such as cut-resistant gloves, safety glasses, hearing protection, and sturdy footwear should be worn at all times during operation and servicing. Keep bystanders and animals at a safe distance, and never operate the machine in enclosed spaces where exhaust fumes and noise could accumulate. Always disengage the blade and brush system, remove the key, and allow the engine to cool before attempting any adjustment, cleaning, or parts replacement. Adhere to manufacturer-recommended operating speeds and avoid forcing the machine through obstacles, as this can cause premature wear or unexpected kickbacks.

Tools and workspace setup are critical to performing effective maintenance and troubleshooting. Prepare a clean, well-lit workspace with a non-slip mat or ground surface to prevent movement during service. Gather essential hand tools, including wrenches, sockets, screwdrivers, pliers, and a torque wrench, as well as a compatible brush height gauge and replacement parts recommended by Gravely for the 28 model. A charged battery, fresh fuel of the correct octane rating, and an approved fuel stabilizer should be available for testing after service. Organize fasteners and components in labeled containers to avoid misplacement, and document any unusual wear patterns or damage observed during inspection to inform future repairs or service intervals. Regularly calibrate safety shields and guards to maintain proper clearance around moving parts and ensure reliable protection during operation.

In addition to general safety practices, become familiar with model-specific cautions. The GRAVELY POWER BRUSH 28 involves high-torque brush motors and a driven belt system that can suddenly respond to load changes. Never attempt adjustments while the engine is running; always remove the key and disconnect the spark plug cap or battery leads as applicable to lockout the system. Understand the stop and limit positions for all adjustable components, including brush depth and height, to prevent contact with the ground or debris that can cause kickback or wrap around. When transporting or storing the machine, ensure the brush is retracted, shields are secured, and fuel is drained or stabilized according to local regulations to minimize fire risk and environmental impact. By following these guidelines, operators can work safely, efficiently, and with confidence on every job site.

Overall, the combination of proactive safety discipline, organized tools and workspace, and knowledge of model-specific protections ensures that the GRAVELY POWER BRUSH 28 performs at peak efficiency while keeping personnel protected. Regular safety audits, adherence to maintenance schedules, and prompt attention to abnormal sounds or vibrations will help detect potential faults before they lead to failure. The integration of proper PPE, careful handling of parts, and thorough documentation creates a safer, more productive workflow for every operator dealing with this demanding outdoor power equipment.

In summary, this section emphasizes the foundational safety culture required when operating or servicing the GRAVELY POWER BRUSH 28. By rigorously applying safety-first practices, preparing the correct tools and workspace, and observing model-specific cautions, users can minimize risk and maximize performance. Continuous education, routine checks, and disciplined shutdown procedures form the backbone of sustainable, professional maintenance and operation for this equipment.

Tools and workspace setup

Establishing an organized workspace is essential for efficient maintenance and safe operation of the GRAVELY POWER BRUSH 28. Layout a dedicated area with ample room to maneuver the unit, access panels, and removable brush assemblies. Use a sturdy workbench for small components and a stable stand or jack for elevating the machine during servicing. Ensure proper ventilation and lighting, and keep a fire extinguisher within reach in case of fuel or electrical hazards. A labeled tool grid or shadow board helps technicians quickly locate wrenches, torques, and specialty tools without delaying critical tasks. For electro-mechanical work, keep insulated tools and a multimeter available to verify continuity and voltage levels in accordance with the manual. When working outdoors or in the field, bring a portable worktable or fold-out mat to keep components clean and free from dirt or moisture.

Key hand tools and consumables should be prepared before beginning any service. This includes metric and standard socket sets, precision screwdrivers, pliers, a torque wrench, a rubber mallet, thread-locking compound, grease, and replacement belts or brushes compatible with the GRAVELY POWER BRUSH 28. Ensure you have the correct fuel, oil type, and lubricant specified by Gravely, as using incorrect fluids can degrade performance and void warranties. Replacement safety shields, gaskets, seals, and fasteners should be on hand to streamline maintenance without repeated trips to the supply source. A diagnostic scan tool or service manual access can be invaluable for reading error codes or verifying sensor calibration if equipped. Finally, maintain a parts caddy with critical fasteners and small components to avoid missing items during reassembly and to support a quick turnaround on service jobs.

Workspace setup also requires attention to safety demarcations and environmental considerations. Keep the service area clear of flammable materials and ensure that all spill containment measures are in place when working with oils or fuels. Use drip trays and absorbent pads to manage potential leaks, and dispose of used fluids following local regulations. Establish a clean-up routine at the end of each session, including wiping down tools, inspecting for wear, and returning components to their designated storage locations. A well-organized, methodical approach to workspace setup reduces risk, accelerates repairs, and improves overall service quality for the GRAVELY POWER BRUSH 28.

For field service scenarios, adapt the tool and workspace setup to portable configurations. Bring modular tool bags with essential items, secure a compact lighting system, and plan for weather contingencies such as rain or dust. Maintain a checklist that covers pre-operation inspection, safety verification, and post-maintenance testing to ensure consistency across multiple jobs. By standardizing the setup process, technicians can achieve faster turnaround times while maintaining high safety and quality standards for every service engagement.

The Gravely Power Brush Twenty Eight is a robust ground-engaging unit designed for precision surface maintenance and debris clearing across varied terrain. Built to withstand demanding outdoor conditions, it combines a reinforced chassis with a high-output drive system to deliver consistent, even brushing action. Operators will appreciate the balance between maneuverability and power, which allows for efficient coverage in municipal maintenance, industrial sites, and large property landscapes. The twenty eight model incorporates thoughtful ergonomics and serviceable components to minimize downtime during routine maintenance and field repairs. This section provides essential details to support safe operation, effective performance, and straightforward upkeep of the machine weathered by daily use.

The Gravely power brush model twenty eight overview includes its purpose-built brush assembly, drive configuration, and control scheme tailored for reliable, professional-grade cleaning and surface finishing. The design emphasizes accessibility of critical service points, enabling quick inspections and straightforward replacements of wear parts. Users should become familiar with the layout of the operator controls, braking mechanisms, and PTO engagement to maximize efficiency and reduce the risk of operator error. The overall objective is to deliver a durable, high-performance tool that integrates seamlessly with compatible Gravely implements while maintaining compatibility with standard maintenance practices in the field. Proper understanding of the overview supports informed decision-making when scheduling maintenance, parts replacement, and routine calibration checks.

Technical specifications for the Gravely power brush twenty eight include engine type, power output, rotation speed, gear ratios, brush diameter, and hydraulic or electric drive details as applicable to the model variant. The machine is engineered to provide a precise brushing pattern with uniform wear across all segments of the brush, minimizing streaks and uneven surfaces on treated areas. Load handling, stability, and ballast considerations are addressed to ensure consistent operation on slopes or uneven ground. This section also enumerates the critical parts list and a concise description of each component’s role in the system, which aids technicians in diagnosing issues and ordering correct replacements. Adhering to the specified torque values and lubrication intervals is essential to extend service life and maintain optimal performance.

The parts list accompanying the Gravely power brush twenty eight outlines every replaceable item, from fasteners and bearings to drive belts and wear plates. Each entry includes part numbers, compatible models, and anticipated service intervals based on typical operating conditions. Maintenance personnel should cross-reference the list during inspections to verify inventory levels and identify worn components early. Routine checks on the brush assemblies, belt tensions, and mountings help prevent operational downtime caused by component failure. Documentation of parts usage and maintenance dates supports traceability and compliance with safety and performance standards for field operations.

In addition to the core specifications, the manual highlights recommended service intervals, lubrication points, and safety precautions pertinent to the Gravely power brush twenty eight. Regular inspection of the brush head alignment, drive shaft seals, and PTO connections ensures consistent contact with the working surface and reduces the likelihood of vibration-induced wear. The guide emphasizes using manufacturer-approved fluids, correct filter types if applicable, and adherence to torque sequences when assembling critical joints. By following these guidelines, operators can achieve reliable results, prolong component life, and maintain high productivity in demanding environments.

Initial setup and inspection

Unpacking and preliminary inspection begins the moment the Gravely Power Brush 28 is removed from its packaging. Carefully inspect all components for visible damage, and verify that the correct model and serial numbers match your purchase documents. Lay out the parts on a clean, flat surface and cross-check against the equipment list included in the packaging to ensure nothing is missing. If any items are damaged or not found, document the issue with clear photos and contact the authorized service provider for guidance before proceeding. Take note of the recommended tools required for setup, and prepare a dedicated work area away from ignition sources or moisture to maintain safety throughout the procedure.

During the initial inspection, verify fluid levels and the condition of the fuel system if the model uses a gasoline engine. Check the fuel for freshness and absence of contamination, and inspect the fuel lines for cracks or signs of wear. Ensure the oil level is within the manufacturer’s specified range and that the oil type is appropriate for the operating temperature and workload. Examine the air filter element for cleanliness; a dirty or damaged filter can restrict airflow and impair performance. Confirm all fasteners are present and torqued to the specified values, and inspect the drive belt or shear bolts for wear or damage before any operation begins. Document any deviations and plan for corrective action before attempting startup to prevent equipment damage.

Control and safety device checks are critical to an safe and reliable startup sequence. Test the ignition switch or electrical system for proper function, ensuring the engine arms and responds correctly to start requests. Inspect the throttle linkage, choke, and kill switch to confirm smooth operation without sticking or binding. Verify the presence and condition of safety interlocks or blade engagement mechanisms, and ensure that the blade deck is clear of debris and obstructions. Pay close attention to the presence of a functional backup safety mechanism, such as a dead man switch or bail bar, and confirm that it reliably interrupts operation when released. Finally, perform a preliminary test run at low idle with all guards and shielding in place to verify safe operation and to listen for unusual noises or vibrations that could indicate misadjustment or component wear requiring service before normal use.

Maintenance and routine service

Daily maintenance procedures are essential to ensure reliable operation and extend the life of the Gravely Power Brush 28. Begin each session by performing a visual inspection for loose bolts, damaged guards, or missing fasteners. Check the belt covers and the debris shield for secure mounting, and look for signs of wear on moving parts. Remove any accumulated soil, grass, or brush buildup from the cutting deck, drive belt area, and intake openings using a soft brush or compressed air, taking care to avoid dislodging components. Confirm that the operator presence controls return to the neutral position and that all safety interlocks function correctly before starting the unit. A quick check of the fuel level and oil level should be performed, replenishing as needed with manufacturer-approved fluids to prevent dehydration of seals and reduced performance.

Periodic lubrication and belt tensioning are critical to maintaining efficient power transmission and reducing wear. Refer to the manufacturer’s lubrication schedule to identify the recommended intervals, but inspect bearings, pulleys, and the drive belt for signs of glazing, cracking, or oil contamination on a regular basis. Apply the correct grade of recommended grease to accessible zerk fittings and moving joints, avoiding over-lubrication which can attract dirt. For belt tensioning, measure the belt deflection at the specified midpoint with the unit at rest and the blades off, adjusting the tension until it meets the manufacturer’s tolerance. After tensioning, recheck pulley alignment and ensure the belt runs smoothly without squealing or slipping during light operation.

Air filter and cooling system care are essential for reliable performance in dusty field conditions. Remove and inspect the air filter cartridge or element for excessive dirt, rips, or deterioration, replacing it with an OEM part if needed. Clean the air intake screens and verify that the cooling fins on the engine and surrounding components are clear of debris to maintain optimal operating temperatures. Check the cooling system hoses for cracks or leaks and ensure clamps are tight. During maintenance, inspect the radiator or cooling shrouds for blockages and clean them with a soft brush or compressed air from the clean side outward. Proper airflow reduces engine stress, improves fuel efficiency, and lowers the risk of overheating during extended use.

Common symptoms and quick checks: When diagnosing a Gravely Power Brush 28, start with a structured checklist to rapidly identify probable causes. Listen for abnormal engine sounds, note any excessive vibration, smoke, or unusual odors, and observe whether the unit starts, runs, or dies under load. Check the fuel system for correct gasoline type, stale fuel, and clogged lines or filters. Inspect the air filter for cleanliness and ensure the carburetor is delivering an appropriate mixture. Verify the blade engagement clutch operates smoothly and that the drive belt tension is within specification. Finally, confirm that all safety interlocks are engaging properly and that the spark plug is clean, correctly gapped, and free of fouling. A systematic approach helps isolate electrical, mechanical, or user-induced faults without unnecessary disassembly.

Electrical and starting issues: Electrical problems on the Gravely Power Brush 28 can manifest as failure to start, rough idle, or intermittent operation. Begin by checking the battery condition if the unit uses an electric start, ensuring terminals are clean and connections are tight. Inspect the starter motor for signs of wear, and probe the ignition switch for continuity when in the start position. Inspect the safety switches and wiring harness for corrosion, loose connectors, or damaged insulation that could interrupt the starting circuit. If the unit uses a magneto, verify that the flywheel key is intact to maintain proper timing. For fuel-injected or carbureted models, confirm that the kill switch wiring is not shorted and that the carburetor idle adjustment does not cause flooding or stalling. In all electrical checks, disconnect the spark plug boot to safely test for shorts and consult the service manual for torque values on fasteners before reassembly.

Performance and cutting issues: When the brush or mower experiences reduced cutting performance or uneven results, assess the cutting system first. Examine the cutting blades or brushes for wear, damage, or improper height adjustment, and replace or resurface as necessary to restore optimal engagement. Check the blade spindle, arbor, and associated bearings for play, overheating, or noise that could indicate worn components. Ensure the cutting deck or brush head is clean, free of debris, and properly aligned to prevent binding. Inspect the drive system for belt wear, tension, and alignment, verifying that pulleys are true and free of obstruction. Evaluate engine performance under load to determine if fuel delivery, air supply, or ignition timing may affect cutting efficiency; perform a compression test if engine power loss is suspected and compare readings to factory specifications. Finally, confirm all safety devices function correctly and that operator controls respond consistently to inputs, as inconsistent control behavior can masquerade as cutting problems.

Repair procedures

The Gravely Power Brush 28 requires careful attention when performing repair procedures to maintain performance and safety. Begin by ensuring the machine is on a flat, stable surface and the ignition is disabled before inspecting any components. With powered-off equipment, consult the service manual to identify all fasteners and connectors unique to the model, and gather the appropriate tools, including torque values specified for fasteners. Before removing any parts, document the current arrangement or take photos to aid reassembly. Proper labeling of wires and a clean work area help prevent miswiring or misalignment during the repair process. When replacing components, verify compatibility with the exact model year and revision, as there can be mid-production changes that affect fitment and operation.

Component replacement steps require methodical disassembly in the correct sequence to avoid damage to adjacent parts. Begin with disconnecting power sources and draining any hydraulic or fuel lines if present, following all safety guidelines and environmental regulations. Remove protective shields and access panels to access the target component, taking care not to bend or stress surrounding housings. Carefully detach fasteners, keeping track of their sizes and locations to ensure accurate reinstallation. After removing the faulty component, inspect mounting points and neighboring parts for wear or damage, replacing any items that show signs of excessive wear. Install the new component with the correct orientation, apply any required lubricants or thread-locking compounds, and snug fasteners to the manufacturer’s specified torque values. Finally, reassemble shields and covers, reconnect any electrical connectors, and perform a thorough visual inspection to confirm there are no clearance issues or loose fittings before test running the unit.

Drive system service and belt replacement demand precise alignment and tensioning to preserve belt life and drivetrain efficiency. Start by isolating the drive system from the power source and removing the belt guard to expose the pulley and belt paths. Inspect belts for cracks, glazing, fraying, or missing ribs, and replace any worn components with the correct belt part number. When installing a new belt, route it according to the diagram printed on the guard or in the service manual, ensuring it sits properly in all pulley grooves. Check the belt tension using the specified method, such as a deflection measurement at a center span or a tension gauge, and adjust to the recommended range. After belt installation, verify pulley alignment by rotating the drive system by hand to confirm smooth operation without interference. Reinstall guards, perform a functional test, and listen for unusual noises that could indicate misalignment or a pinched belt. If any irregularities are detected, recheck the routing and tension before applying full power, and verify that the drive system engages and disengages correctly during operation.

Brush deck and head maintenance focuses on preserving cutting efficiency and preventing debris buildup that can affect performance. Begin with a powered-down machine and remove any guards to access the brush deck surface. Inspect the brush wear indicators or the brush assemblies themselves to determine whether replacement is necessary; uneven wear may indicate misalignment or improper tension. When replacing brushes, match the new brush length, stiffness, and mounting hardware to the original specifications, ensuring secure fastening without over-tightening. Clean the deck surface of any accumulated grass, sap, or dirt using approved cleaning tools, avoiding abrasive materials that could scratch the deck. Check the head and deck pivot points for smooth movement, lubricating hinges or bushings as required by the maintenance schedule. Reassemble all protective components, verify that the brush deck operates with balanced rotation, and conduct a slow-speed test to confirm consistent cutting performance and absence of abnormal vibrations or noise.

Adjustments and calibrations

Depth and height adjustments are critical for achieving optimal cutting performance and avoiding excessive wear on the cutting components. Begin by verifying that the cutting deck is level side-to-side and front-to-rear using a precise ruler or caliper on multiple points along the blade span. If any misalignment is detected, adjust the deck mounting brackets to bring the surface into true plane with the ground. After leveling, set the cutting height according to the manufacturer’s recommended ranges for the specific model and task, then perform a test pass over an unobstructed area to confirm consistent engagement and uniform cut depth. It is important to recheck all fasteners after the initial adjustment to ensure nothing shifts during the test, as vibration can alter alignment. Regularly inspect the height adjustment kit for wear or bent components and replace any worn parts to maintain precise control over depth variations during operation.

Speed and torque considerations play a pivotal role in both performance and component longevity. Start by confirming the engine or power source is operating within the specified RPM range for the attachment, and verify that any variable speed control is responding accurately across its full range. When adjusting torque, monitor engagement with the ground or material, ensuring that the drive system maintains consistent traction without slipping or stalling under load. If you notice fluctuations in speed or unusual noise, consult the drive belt, clutch, and pulley assemblies for wear, proper tension, and alignment. Document any deviations and follow the service manual’s torque specifications for fasteners and joints to avoid over-torquing, which can cause premature failure of critical components. For sustained performance, perform periodic torque calibrations after major maintenance or hard use, and log the results for future reference.

Brake and safety interlocks checks are essential for reliable operation and operator protection. Start with a thorough inspection of the brake system to ensure full engagement and release within the expected travel range, and verify that any safety interlocks disengage the drive and cutting mechanisms only when the operator presence controls are in the proper position. Test the interlock circuits with the equipment powered off to confirm that fault indicators illuminate correctly and that safety relays function as designed. If a brake drag or partial engagement is observed, inspect the brake pads or shoes for wear, the actuator linkage for binding, and the hydraulic or pneumatic lines for leaks, replacing worn components as needed. Calibrate any adjustable interlock sensors to maintain precise cut-off timing, and verify that emergency stop devices engage and disengage without excessive force. Regular functional tests should be incorporated into daily startup routines to ensure that no safety degradation has occurred during maintenance or storage periods.

Safety and environmental considerations

Hazard awareness and PPE: Operating and servicing outdoor power equipment requires attentive hazard recognition and the use of appropriate personal protective equipment. Before performing any maintenance or installation work on the Gravely Power Brush 28, inspect the work area for potential dangers such as sharp edges, moving parts, or exposed spark sources. Wear protective eyewear rated for impact, a snug-fitting long-sleeve shirt, durable gloves designed for tool handling, and sturdy footwear with good grip. In environments where dust, debris, or chemical agents may be present, add a suitable respirator or particulate mask and hearing protection if equipment noise levels are elevated. Always ensure bystanders are clear of the work area and secure the machine to prevent accidental movement during service tasks. Adhere to lockout/tagout procedures when disconnecting any power or fuel sources to maintain a safe maintenance environment. Maintain a clean workspace, promptly address spills, and store tools in a designated location to minimize trip hazards and exposure to hot or moving components.

Storage and disposal guidelines: Proper storage of the Gravely Power Brush 28 and related consumables is crucial for safety and equipment longevity. Store the machine in a dry, well-ventilated area away from open flames, sources of heat, or ignition hazards. Ensure fuel is stored in approved containers, tightly sealed, and kept away from children or unauthorized users. When storing for extended periods, follow manufacturer recommendations for fuel stabilization or drainage to prevent varnish formation in the carburetor and fuel system. Keep batteries, if applicable, in a cool, dry place with terminals protected from short circuits. For disposal, follow local regulations for the disposal of used oil, filters, batteries, and any contaminated components. Recycle metal parts where possible and segregate hazardous waste according to applicable environmental guidelines. Regularly inspect storage areas for signs of corrosion, leaks, or degradation that could pose a risk upon startup or use. Maintain a perpetual log of storage dates and disposal actions to support compliance and traceability during inspections or audits.

Hazard awareness and PPE: In addition to general PPE, be mindful of hot surfaces, rotating assemblies, and pinch points that can occur during startup and maintenance. Allow the engine to cool before touching the exhaust system or muffler, and use heat-resistant gloves if contact is unavoidable. When handling blades or cutting components, use sharp-edged protection and deflection shields to reduce the risk of lacerations. Keep hands and clothing away from belts, pulleys, and drive shafts, and never attempt to bypass safety interlocks or guards. If a fault or abnormal vibration is detected during operation, stop the machine immediately, remove the ignition key or disconnect power, and perform a thorough inspection or consult a qualified technician. Document any safety incidents and review operating procedures with all personnel involved to reinforce safe practices during every work cycle.

Storage and disposal guidelines: Environmental responsibility extends to routine maintenance tasks such as oil changes, filter replacements, and drainage. Use approved containers for used oil and filters, and promptly transport them to a certified recycling facility or service center. Avoid pouring fluids on the ground or into drainage systems, and always neutralize spills with absorbent materials before cleanup. When replacing consumables such as air filters, seals, or gaskets, dispose of the old parts in accordance with local waste management guidelines and recycle materials where feasible. Maintain a spill kit in the workshop and ensure all personnel are trained in its proper use. By following these storage and disposal practices, operators contribute to safer workplaces and reduced environmental impact while preserving the reliability and performance of the Gravely Power Brush 28 for years of service.

The Gravely Power Brush 28 service documentation relies on a structured set of references to ensure accurate maintenance and repair procedures. This manual consolidates primary operator and service references, revision histories, and update notes to keep technicians informed about design changes, part substitutions, and safety advisories. It is essential to cross-reference the most current revision date and component list when performing any service task to prevent mismatches and ensure optimal performance. Maintaining an organized archive of manuals, service bulletins, and compatibility charts helps reduce downtime and supports consistent repair quality across different units and production runs. Keep a dedicated log of all updates applied to each machine to support warranty compliance and accurate service history.

Sourcing genuine parts and compatibility requires strict adherence to published part numbers and interchangeability guides. Only genuine Gravely parts, accessories, and components specified for the Power Brush 28 should be installed to preserve performance, safety, and durability. When a primary part is unavailable, refer to the official compatibility matrix to identify acceptable substitutions that meet or exceed original specifications. It is recommended to verify part numbers against serial numbers and model identifiers before ordering to minimize misfits and delays. Maintain an approved supplier list and document any approved alternatives with notes on expected life and warranty implications to ensure traceability for future maintenance cycles.

The documentation and spare parts section emphasizes the importance of using updated schematics, exploded views, and torque specifications tied to the exact build date of the machine. Users should routinely check for revised torque charts, updated fastener grades, and revised component assemblies as published by Gravely. Proper documentation of every replacement part, including batch numbers and supplier details, supports quality control and root-cause analysis for recurring failures. This approach also facilitates efficient recalls or field service actions if required, by providing clear traceability from tool to part to machine. Adhering to these guidelines helps sustain the reliability of the Power Brush 28 in demanding outdoor maintenance environments.