The Gravely Pro-Walk Hydro is an owner/operator manual for a commercial walk-behind mower, specifically models 988146 (HR1536FL), 988147 (HE1948FL), and 988148 (HE1952FL). These mowers are designed for professional lawn care, offering robust performance and durability.
Function Description:
The Gravely Pro-Walk Hydro is a walk-behind mower designed for cutting grass. It features a hydrostatic drive system, allowing for smooth and variable speed control. The mower deck is equipped with rotating blades for efficient grass cutting, and a discharge chute directs clippings away from the operator. Safety interlock systems are integrated to ensure safe operation, preventing the engine and blades from engaging under unsafe conditions. The unit is powered by an internal combustion engine, with specific engine models varying by unit. The controls include a throttle lever, choke control, PTO (Power Take Off) switch for engaging/disengaging blades, ignition switch, and control levers for steering and speed. The cutting height is adjustable to suit different lawn conditions and preferences.
Important Technical Specifications:
- Models: 988146 (HR1536FL), 988147 (HE1948FL), 988148 (HE1952FL)
- Engines:
- 988146: Kawasaki FH430V (431 cc displacement, Recoil Starter)
- 988147/988148: Kawasaki FH580V (585 cc displacement, Electric Starter)
- Fuel Tank Capacity: 6.6 gallons (25 liters) for all models.
- Hydraulic System Capacity:
- Completely Dry System: 5 qt (4.7 liters)
- Hydraulic Reservoir With Filter Change: 3.5 qt (3.3 liters)
- Cutting Width:
- 988146: 35.5 in. (90.1 cm)
- 988147: 47.5 in. (120.7 cm)
- 988148: 51.5 in. (130.8 cm)
- Cutting Height: 1-1/2 - 5 in. (3.8 – 12.7 cm), adjustable in 16 positions. Additional height up to 5.0 in. (127 mm) can be achieved by removing blade spacers.
- Spindles: 1-In. (2.5 cm) Aluminum – Sealed.
- Blade Bolt Torque: 120 lbf-ft (163 N•m).
- Travel Speed:
- Forward: 0-7 mph (0 – 13.2 kph)
- Reverse: 0-3 mph (0 – 5 kph)
- Tires:
- Front - Solid: 9 x 3.5 (22.9 x 8.9 cm)
- Rear - Pneumatic: 16 x 16.5-8 (40.6 x 41.9-20.3 cm)
- Rear Inflation: 10 – 12 psi (69 – 83 kPa)
- Dimensions:
- Length: 76.5 in. (194.3 cm) for 988146; 73 in. (185.4 cm) for 988147; 75 in. (190.5 cm) for 988148.
- Height: 44.5 in. (113 cm) for all models.
- Width: 37 in. (94.0 cm) for 988146; 48.5 in. (123.2 cm) for 988147; 52.5 in. (133.4 cm) for 988148.
- Weight: 570 lbs. (258.5 kg) for 988146; 707 lbs. (320.7 kg) for 988147; 728 lbs. (330.2 kg) for 988148.
Usage Features:
- Operator Presence Safety Interlock System: Requires the operator to engage a safety switch for the mower deck to operate, and the deck stops if the operator releases the control lever.
- Parking Brake: Essential for securing the unit, especially on slopes.
- Adjustable Control Handle Height: Allows operators to customize the handle position for comfort and control.
- Adjustable Cutting Height: Utilizes HOC (Height of Cut) rods and spacers for precise adjustments from 1-1/2 to 5 inches.
- Manual Movement: Bypass valves allow the unit to be pushed manually when the engine is off, useful for moving the mower without power.
- Transportability: Instructions are provided for safely loading and unloading the unit onto a trailer or truck.
- Tracking Adjustment: Allows for calibration of the control levers to ensure the unit drives in a straight line.
Maintenance Features:
- Daily Operating Checklist: Includes checks for engine and hydraulic oil levels, belt condition, air filter, mower deck level, tire pressure, and safety systems.
- Engine Oil Level Check and Change: Detailed steps for checking oil, adding/draining oil, and changing the oil filter.
- Air Intake Screen and Engine Fins Cleaning: Important for preventing overheating.
- Air Filter Element Check and Cleaning: Procedures for maintaining the air filter.
- Spark Plug Check: Regular inspection of spark plugs.
- Fuel Filter Replacement: Steps for safely replacing the fuel filter.
- Transmission Oil Level Check and Change: Instructions for checking and changing hydraulic oil and filter.
- Transmission Neutral Position Adjustment: Procedure for calibrating control levers to ensure wheels stop rotating in neutral.
- Traction Drive Belt Removal and Installation: Steps for replacing the main drive belt.
- Mower Deck Drive Belt Removal and Installation: Specific instructions for replacing the deck belts for different models.
- Mower Deck Rake Adjustment: Procedure for setting the front-to-rear rake of the deck.
- Mower Blade Maintenance: Includes checking for bent blades, sharpening, balancing, and replacement instructions.
- Spindle Bearing Replacement: Detailed steps for replacing mower spindle bearings.
- Idler Pulley Replacement: Instructions for replacing the mower deck idler pulley.
- Electrical Service (988147, 148): Battery safety, removal, installation, cleaning, and fuse replacement.
- Parking Brake Adjustment: Procedure for ensuring the parking brake holds the unit securely.
- Fuel System Maintenance: Recommendations for using proper fuel, adding stabilizer, and safe fuel handling.
- Caster Wheel Roller Bearing and Pivot Bearing Bushing Service: Lubrication and replacement instructions for caster wheel components.
- Rear Wheel Lug Nut Torque Check: Ensures proper tightening of lug nuts.
- Lubrication Points: Specifies areas requiring regular greasing, including caster wheel bearings, pivot bushings, and drive belt idler arm pivot joint.
- Storage Guidelines: Short-term and long-term storage procedures, including fuel system treatment.
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