This document describes the Gravely Pro-Master series of commercial mowing equipment, specifically models 990024 (PM 320 HD) and 990025 (PM 3084). It serves as an owner/operator manual, providing essential information for safe and effective use, maintenance, and troubleshooting.
Function Description
The Gravely Pro-Master is a commercial-grade riding mower designed for professional landscaping and grounds maintenance. Its primary function is to efficiently cut grass and maintain turf areas. The mower features a robust design suitable for demanding use, with controls and features engineered for operator comfort and productivity. Key operational components include a throttle lever, choke control, ignition switch, PTO switch for engaging the cutting deck, deck lift lever for height adjustment, and a parking brake. The machine is equipped with a hydraulic system for various functions, including steering and power to the cutting deck.
Important Technical Specifications
The two models, 990024 (PM 320 HD) and 990025 (PM 3084), share many specifications but differ in some aspects, particularly related to the cutting deck and weight.
Engine:
- Engine Type: Kawasaki (for both models)
- Displacement: 58.09 cubic inches (952 cc)
- Governed RPM: 3600
- Liquid or Air Cooled: Air
Speed:
- Forward Maximum: 9.5 mph (15.2 km/h)
- Reverse Maximum: 5 mph (8 km/h)
- Turning Radius: Zero
Steering: Yoke
Brakes: Dynamic Disc – Parking
Electrical:
- Starter: Electric
- Battery: Group 70, 450 CCA 12-V Maintenance Free
- Power Take-Off: Electric PTO Clutch/Brake
Fuel:
- Fuel Type: Refer to Engine Manual
- Fuel Tank Capacity: 7.5 gallons (28.4 L)
Transmission:
- Type: Hydrostatic Drive
- Transmission Oil: Mobil 1 Extended Performance 15W50 Synthetic Oil
- Hydraulic System Capacity: 5.0 quarts (4.73 L)
- Hydraulic Oil Filter: Yes
Size and Weight:
- Length: 82 inches (208.3 cm)
- Width: 50.3 inches (127.8 cm)
- Height (with ROPS Extended): 73.5 inches (186.7 cm)
- Height (with ROPS Folded): 51.25 inches (130.2 cm)
- Weight: 990024 (PM 320 HD) - 967 lbs (439 kg); 990025 (PM 3084) - 1067 lbs (484 kg)
Tires:
- Front Tire Size: 24 x 11.5-12 (61 x 29-30)
- Rear Tire Size: 16 x 6.5-8 (46 x 17-8)
- Front Tire Pressure: 12 – 15 psi (82.8 – 103.4 kPa)
- Rear Tire Pressure: 20 – 25 psi (137.9 – 172.4 kPa)
Lift System: Hydraulic
Usage Features
The Gravely Pro-Master is designed for ease of use and operator safety.
- Controls and Features: The manual details the location and function of all controls, including the ignition switch (with START, RUN, and OFF positions), throttle lever (FAST and SLOW), choke control for cold starts, and a handlebar for steering.
- Deck Lift Lever: Allows the operator to easily raise and lower the cutting deck, as well as place it in a FLOAT position for mowing over uneven terrain.
- PTO Switch: An electric power take-off switch engages and disengages the cutting attachment.
- Cut Height Lever: Provides precise adjustment of the cutting height.
- Hour Meter: Tracks engine run time, total time, and service intervals (TMR1, TMR2, Service Alert).
- Parking Brake: A foot-operated lever to engage and disengage the parking brake.
- Seat Adjustment Lever: Allows the operator to adjust the seat position for comfort.
- Seat Suspension Adjustment Knob: Fine-tunes the seat suspension.
- ROPS (Roll-Over Protective Structure): The unit is equipped with a foldable ROPS for operator protection in case of a rollover. Instructions are provided for proper installation and folding.
- Safety Interlock System: Prevents the engine from starting or operating under unsafe conditions (e.g., PTO engaged, operator off seat, parking brake disengaged).
- Starting the Engine: A clear sequence of steps is provided for starting the engine, including checking safety interlocks, engaging the parking brake, applying choke, and setting the throttle.
- Stopping the Engine: Instructions for stopping the engine and engaging the parking brake.
- Moving Unit Manually: Steps for disengaging the transmission bypass valves to allow manual movement of the unit.
- Adjusting Neutral: Procedures for adjusting the hydraulic pump to ensure proper neutral operation.
- Adjusting Parking Brake: Steps to adjust the parking brake for effective stopping.
- Adjusting Direction Control Pedal: Instructions for fine-tuning the direction control pedal.
- Steering Chain Adjustment: Procedures for adjusting the steering chain for optimal performance.
- Clutch Adjustment: Steps to check and adjust the air gap of the clutch for proper engagement and disengagement.
Maintenance Features
Regular maintenance is crucial for the longevity and performance of the Gravely Pro-Master. The manual provides detailed schedules and procedures.
- Maintenance Schedule: Comprehensive schedules for daily, every 25 hours, every 50 hours, every 75 hours, every 100 hours, every 200 hours, every 400 hours, and every season.
- Checking Safety Interlock System: Regular testing of the safety interlock system is emphasized.
- Check Fasteners: Instructions to check and tighten all fasteners.
- Checking Parking Brake: Procedures to ensure the parking brake is functioning correctly.
- Checking Tires: Adjusting tire pressure to specified levels.
- Checking Hydraulic Oil Level: Regular checks of the hydraulic oil level using the dipstick.
- Cleaning Unit: Instructions for cleaning the engine, deck, and other parts, with warnings against using high-pressure water on certain components.
- Checking and Clean Battery: Regular inspection and cleaning of battery terminals.
- Checking Hydraulic Pump: Visual inspection for leaks and damage.
- Lubricate Unit: Greasing caster spindle and handlebars.
- Service Air Filter Outer Element: Cleaning or replacing the outer air filter element.
- Check Engine Oil Cooler: Cleaning the engine oil cooler.
- Clean Hydraulic Oil Cooler: Cleaning the hydraulic oil cooler.
- Check Spark Plugs: Inspection and replacement of spark plugs.
- Replace Hydraulic Oil Filter: Step-by-step instructions for replacing the hydraulic oil filter.
- Inspect Muffler/Spark Arrestor: Regular inspection for damage or corrosion.
- Check Belts: Inspection and replacement of belts (traction drive or mower drive).
- Replace Air Cleaner: Replacement of the air cleaner element.
- Changing Hydraulic Oil: Detailed procedure for draining and refilling the hydraulic system with the specified Mobil 1 15W50 Extended Performance Synthetic Oil. Warnings about hydraulic fluid under pressure are included.
- Fuel System Maintenance: Instructions for adding fuel stabilizer and proper storage of the unit with fuel.
- Product Registration: Information on how to register the product to ensure warranty coverage and receive service information.
The manual also includes sections on unauthorized replacement parts, disclaimers, delivery information, and a comprehensive troubleshooting guide to address common issues. Safety alerts and decals are prominently featured throughout the document to ensure operator awareness of potential hazards.
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