OWNER’S MANUAL Safety, Assembly, Operating, and Maintenance Instructions Model MT (20.0 HP) Model MTL (25.0 HP) Model MTEFI (26.0 HP) (Covers 2004 Production) ™ Please Read and Save These Instructions For Safety, Read All Safety and Operation Instructions Prior to Operating Machine Effective Date: 01-01-04 P/N 8000-9 Price $5.
Foreword Thank you. . .for purchasing a Walker mower. Every effort has been made to provide you with the most reliable mower on the market, and we are sure you will be among our many satisfied customers. If for any reason this product does not perform to your expectations, please contact us at (970) 221-5614. Every customer is important to us. Your satisfaction is our goal. Please. . .
Table of Contents General Information ________________ 4 Operating Instructions_____________ HIGHLIGHTED INFORMATION _____________ 4 GLOSSARY ____________________________ 4 IDENTIFYING NUMBER LOCATIONS________ 4 ENGINE SERIAL NUMBER LOCATION ______ 5 SERVICING OF ENGINE AND DRIVETRAIN COMPONENTS ______________ 5 CONTROL IDENTIFICATION, LOCATION, AND FUNCTION _____________ Operating Controls ___________________ Engine Choke - (Model MT and MTL only) Engine Throttle _____________________ Forward Speed Cont
Table of Contents Maintenance Instructions __________ 52 MAINTENANCE SCHEDULE CHART _______ 52 IMPORTANT TIPS FOR CARE OF THE KOHLER ENGINE _______________ 53 Fuel System _________________________ 53 Starting/Stopping _____________________ 53 Cooling System - MT, MTEFI____________ 53 Cooling System - MTL _________________ 53 Air Cleaner System ___________________ 53 Oil _________________________________ 54 LUBRICATION _________________________ 54 Engine Oil ___________________________ 54 Engine Break-In Oil
Table of Contents ELECTRICAL SYSTEM __________________ Circuit Breakers ______________________ Wiring Diagram - Model MT_____________ Wiring Diagram - Model MTEFI __________ Wiring Diagram - Model MTL____________ 92 92 93 94 96 Warranty ___________________________ 97 3
General Information • LEFT HAND (LH) refers to the left-hand side of the tractor when the operator is seated facing forward in the tractor seat. • POWER TAKE-OFF (PTO) transmits engine power to run the cutter blades and GHS blower. • POWERFIL spreads the mowed material throughout the interior of the grass catcher by an oscillating delivery spout. • Information of special importance has been highlighted in bold type in this manual.
General Information Serial Number Serial Number Tractor Serial Number Location Engine Serial Number Location (MTL) SERVICING OF ENGINE AND DRIVETRAIN COMPONENTS Serial Number Mower Deck Serial Number Location ENGINE SERIAL NUMBER LOCATION Refer to the engine manual that accompanies this manual for the location of the engine serial number. For the mower model(s) covered by this manual, an engine manual is available covering the Kohler engines.
Specifications MODEL AIR COOLED MT (20.0 HP) MTEFI (26.0 HP) LIQUID COOLED MTL (25.0 HP) Kohler Command CH20, 2 Cyl., Gasoline (Air Cooled) Kohler AegisTM LH685, 2 Cyl., Gasoline (Liquid Cooled) ENGINE Manufacturer/Model Kohler Command Pro CH26, 2 Cyl., Gasoline (Air Cooled), Electronic Fuel Injection (EFI) Displacement Displacement Displacement CH20 CH26 LH685 38.1 cu. in. (624 cc) 44.0 cu. in. (725 cc) HP (@ 3600 RPM) HP (@ 3600 RPM) HP (@ 3600 RPM) CH20 CH26 LH685 20.0 26.0 41.1 cu. in.
Specifications AIR COOLED MT (20.0 HP) MTEFI (26.0 HP) LIQUID COOLED MTL (25.
Specifications AIR COOLED MT (20.0 HP) MTEFI (26.0 HP) LIQUID COOLED MTL (25.
Specifications AIR COOLED MT (20.0 HP) MTEFI (26.0 HP) LIQUID COOLED MTL (25.0 HP) 42 in. (107 cm) SD 22 in. (56 cm) 2 in. (5 cm) Center Overlap (Two Blades, CW Rotation) 22 in. (56 cm) 2 in. (5 cm) Center Overlap (Two Blades, CW Rotation) 48 in. (122 cm) GHS 25 in. (64 cm) 2 in. (5 cm) Center Overlap (Two Blades, Counter Rotate) 25 in. (64 cm) 2 in.
Specifications MODEL AIR COOLED MT (20.0 HP) MTEFI (26.0 HP) LIQUID COOLED MTL (25.
Component Identification NOTE: Control Identification shown in Operating Instructions section. Catcher Door Safety Latch Turbine Precleaner Grass Handling System 9.5 Bushel Catcher (Optional) 7.
Component Identification Removable Grass Catcher Screen (Not Visible) Catcher Door Gas Spring Catcher Exhaust Deflector Gas Spring Cover Catcher Lift / Dump Handle Instrument Panel Guard Catcher Door Instrument Panel Box (Shock Mounted) Dump Plate Catcher Door Handle Tailpipe Muffler Left Hand Drive Wheel Anti-Scuff Roller Oil Filter Oil Drain Plug Tailwheel Fork and Wheels Rear View and Left Side View 12 Fuel Filter
Component Identification Model MT Donaldson Air Cleaner Air Cleaner Cover Air Intake Plenum Fuel Filter Fuel Pump Muffler Grass Shield Air Restriction Indicator Throttle and Choke Linkage Fuel Pickup Line Air Intake Hose Muffler Heat Shield Fuel Tank Oil Dipstick/Oil Fill Rubber Bumper (Catcher Support) Precleaner Tube Muffler Jackshaft 20 Amp Fuse (Starter Solenoid) PTO Gearbox Dipstick Turbine Precleaner GHS Blower RH Transmission Lockout Lever RH Hydrostatic Transmission 30 Amp Circuit Br
Component Identification Model MTL Air Cleaner Cover Fuel Filter Overflow Hose Overflow Tank Muffler Muffler Shield Tailpipe Donaldson Air Cleaner Radiator Hose Low Idle Adjustment Screw Throttle and Choke Linkage Air Restriction Indicator Fuel Pickup Line Radiator Cap Air Intake Hose Fuel Tank Oil Dipstick/ Oil Fill Precleaner Tube Radiator Water Pump Air Intake Plenum Top View (Engine Compartment) Model MTL 14 Radiator Guard
Component Identification Model MTEFI Air Cleaner Cover Fuel Pump Donaldson Air Cleaner Fuel Line to Engine (High Pressure) Cylinder Head Temperature Switch Muffler Grass Shield Air Restriction Indicator Throttle Linkage Fuel Pickup Line Fuel Return Line Air Intake Hose Oil Dipstick/Oil Fill Muffler Rubber Bumper (Catcher Support) Fuel Tank Precleaner Tube Ignition Coil Air Intake Plenum Top View (Engine Compartment) Model MTEFI 15
Safety Instructions Pay particular attention to any information labeled DANGER, WARNING, CAUTION, IMPORTANT, and NOTE in this manual. When you see the Safety Alert Symbol ( ), read, understand, and follow the instructions. Failure to comply with safety instructions may result in personal injury.
Safety Instructions 6. 7. 8. 9. Do not wear loose fitting clothing that could get caught in moving parts. Do not operate this machine while wearing shorts; always wear adequate protective clothing, including long pants. Wearing safety glasses, safety shoes, and a helmet is advisable and required by some local ordinances and insurance regulations. Prolonged exposure to loud noise can cause impairment or loss of hearing.
Safety Instructions 9. Watch for holes, rocks, and roots in the terrain and for other hidden hazards. When mowing tall grass, mow higher than desired to expose any hidden obstacles. Then, clean the area and mow to the desired height. 10. Avoid sudden starts or stops. Before backing the machine up, look to the rear to be sure no one is behind the machine. Watch carefully for traffic when crossing or working near roadways. 17. For GHS equipped models, use care when closing the grass catcher door.
Safety Instructions 2. To reduce fire hazards, keep the engine free of grass, leaves, excessive grease, and dirt. 3. Keep all nuts, bolts, and screws tight to ensure the machine is in a safe, working condition. Check the blade mounting nuts frequently, making sure they are tight. 4. Perform only maintenance instructions described in this manual. Unauthorized maintenance operations or machine modifications may result in unsafe operating conditions. 5.
Safety Instructions SAFETY, CONTROL, AND INSTRUCTION DECALS Safety, Control, and Instruction Decals are installed on the machine; if any are missing, illegible, or damaged, a replacement should be ordered and installed before putting the machine into operation. The Decal Part Number is listed below and in the Parts Manual.
Safety Instructions SAFETY, CONTROL, AND INSTRUCTION DECALS Safety, Control, and Instruction Decals are installed on the machine; if any are missing, illegible, or damaged, a replacement should be ordered and installed before putting the machine into operation. The Decal Part Number is listed below and in the Parts Manual.
Assembly Instructions SETUP INSTRUCTIONS Walker Mowers are shipped partially assembled. After uncrating the tractor and mower deck, initial setup is required. NOTE: During the process of unpacking, any damaged or missing parts should be noted and reported to the delivering carrier immediately (put in writing within 15 days). The carrier will provide directions for proceeding with a claim to receive compensation for damage.
Assembly Instructions DANGER Battery Charging DANGER Battery electrolyte is a poisonous and corrosive sulfuric acid solution. BATTERIES PRODUCE EXPLOSIVE GASES • Avoid spillage and contact with skin, eyes, and clothing - causes severe burns. • Charge the battery in a well-ventilated • To prevent accidents, wear safety gog- area, so that gases produced while charging can dissipate. gles and rubber gloves when working with electrolyte.
Assembly Instructions Grease Fitting Locations WARNING Make sure the battery cap vents are open. Improper venting of the battery COULD cause a battery explosion. Spacer Washer Axle Spacer Tube Deck Caster Wheel Installation Battery Clamp Secured by Wing Nut(s) (+) Battery Cable Connection NOTE: If semi-pneumatic wheels are installed, make sure the spacer washers fit over the spacer tube and are not caught between the fork and the end of the tube. The washers should move freely on the axle spacer tube.
Assembly Instructions Deck Discharge Shield Installation (Side Discharge Models Only) Attach Spring Attach the deck side discharge shield by positioning the shield hinge lug in front of the deck mount and fastening with two 3/8-16 x 1-1/4 in. bolts, 3/8-16 ESNA nuts, and 3/8 in. wave spring washers. The wave washers fit between the two hinging surfaces. Tighten the nuts until the shield moves freely but is not loose.
Assembly Instructions 5. Connect the mower deck PTO drive shaft assembly to the tractor with the splined quick disconnect coupler. This coupler simplifies shaft alignment and installation. a. Use the arrows on the shaft and tube to align and slide the PTO quick coupler onto the deck spline shaft. b. Reaching under the tractor, pull the ring back on the coupler, slide onto the spline shaft on the tractor, and release the ring.
Assembly Instructions Deck Leveling 1. 2. Check the side-to-side level. Rotate each blade sideways and measure the distance from blade tip to ground on each side. If measurements vary more than 1/8 in. (3 mm), add a washer shim under the deck support pins on the low side to level the deck. 3. Check the front-to-rear level. Rotate the blades to point forward. Measure the distance from blade tip to ground on the front and rear. The rear of the blade should be 1/8 to 1/4 in.
Assembly Instructions PREOPERATING CHECKLIST Before operating the mower for the first time, and as a routine before daily operations, it is important to make sure the mower is properly prepared and ready for operation. The following is a list of items to be checked. (For a mower with frequent operation, some of these items will not need to be checked every day, but the operator should be aware of the condition of each.) For proper fuels and lubricants refer to Specifications.
Assembly Instructions CHECK ENGINE COOLING SYSTEM - Model MTL • Check the radiator air intake screen to make sure the screen is clean and free of obstruction. Also, the radiator cooling fins should be inspected and cleaned if there is any buildup of dirt or debris. (Remove the intake screen assembly to inspect and clean.) • Check the coolant levels in the radiator and overflow tank. If additional coolant is needed, refer to CHECKING/SERVICING the Engine Cooling System in Maintenance Instructions.
Assembly Instructions CHECK MOWER BLADE CONDITION, SHARPNESS, AND SECURITY OF MOUNTING The blade mounting nut should be tightened to 60 ft-lb (81.3 N⋅m). If blade sharpening is required, refer to CHECKING/SERVICING for Sharpen Mower Blades in Maintenance Instructions. ADJUST MOWER CUTTING HEIGHT, IF REQUIRED Position the hitch pins in the four deck support pins. Refer to the “Cutting Height Adjustment” decal on the deck gearbox cover.
Operating Instructions CONTROL IDENTIFICATION, LOCATION, AND FUNCTION Operating Controls CAUTION Before operating the mower, become familiar with the location and function of all operator controls. Knowing the location, function, and operation of these controls is important for safe and efficient operation of the mower. Engine Choke - (Model MT and MTL only) The choke control lever (black knob) is located on the left side of the seat.
Operating Instructions Steering Levers Choke Throttle Choke and Throttle Location (MT and MTL) Engine Throttle The throttle control lever (red knob) is located on the left side of the seat and is used to control engine speed. Moving the lever forward toward the FAST position increases engine speed; moving it backward toward the IDLE position decreases engine speed.
Operating Instructions The Forward Speed Control also Establishes the Neutral-Park Position of the Steering Levers LEFT WHEEL STEERING LEVER RIGHT WHEEL STEERING LEVER FORWARD SPEED CONTROL LEVER (FSC) Full Forward Ground Speed Position Forward Position (No Control Change) Intermediate Ground Speed Position Neutral-Park Position Reverse Drive Wheel Motion Position Neutral-Park Position PARKING BRAKE MTL MTEFI MT Disengaged Position Fast Throttle Position Engaged Position Disengaged Position
Operating Instructions Front Body Latch Release The front portion of the tractor body hinges forward for maintenance access and is latched down in the OPERATING position. To raise the body, move the latch release forward. NOTE: The transmission plunger on the side of the transmission case (activated by the LOCKOUT LEVER) must be completely released during operation of the mower, otherwise operation of the transmission will be erratic.
Operating Instructions Instrument Panel This illustration shows the configuration of the switches and indicators located on the instrument panel.
Operating Instructions Hourmeter Water Temperature Warning Light (Model MTL) The hourmeter displays operating time accumulated while the ignition switch is in the ON position. The water temperature warning light indicates that engine coolant temperature is above the safe operating limit and the engine is overheating. If this light comes on, there may be a problem with: Voltmeter The voltmeter displays battery and charging system voltage.
Operating Instructions Ignition Switch Circuit Breakers The ignition switch is used to start and stop the engine. The switch has three positions: “O” is the OFF position, RUN is the position the key returns to after starting, and “S” is the START position. When starting the engine, turn the key clockwise to the “S” position. Do not hold the key in the “S” position longer than 10 seconds.
Operating Instructions STARTING THE ENGINE CAUTION Before operating the mower, read and understand all Safety Instructions and Operating Instructions. Cold Start Lever Engaged WARNING NEVER run the engine in an enclosed or poorly ventilated area. Engine exhaust contains carbon monoxide, an odorless and deadly gas. 1. Optional Cold Start Lever 2.
Operating Instructions IMPORTANT: For Model MT and MTL, make sure the choke is in the OFF position during normal engine operation; running with the choke in the ON position CAN damage the engine. ADJUSTING GROUND SPEED AND STEERING IMPORTANT: If the DSD52 or DSD62 Mower deck is installed on the tractor, make sure the dolly wheel is retracted BEFORE moving. CAUTION Learn to START, STOP, and MANEUVER the mower in a large, open area.
Operating Instructions ENGAGING THE MOWER Pull Steering Levers With Left Hand 1. Set the engine throttle at about 1/3 speed. Do not attempt to engage the blade clutch at high engine speeds. This will drastically shorten drive belt life. Use only moderate engine speed when engaging the blade clutch. 2. Pull the blade clutch lever SLOWLY up to engage the mower blades. CAUTION Forward Speed Control Keep Feet On Footrest (FSC) When Moving Correct Operator Hand Position on the Controls 3.
Operating Instructions WARNING A brake stops the cutter blades (and blower on GHS equipped models) from freewheeling within five (5) seconds after disengaging the clutch. If the brake system malfunctions and the blades do not stop within five (5) seconds, the brake should be adjusted or repaired before operating the mower. Refer to ADJUSTMENTS of Blade Clutch (PTO) in Maintenance Instructions. Engaged Position 4. Blade Clutch Engaged Turn the ignition switch OFF.
Operating Instructions ADJUSTING CUTTING HEIGHT 3. WARNING The engine must be stopped before adjusting cutting height. Disengage the blade clutch (PTO), stop the engine, and remove the ignition key. Wait for all movement to stop before getting off the seat. Lockout Lever Cutting height is adjusted by positioning the four retainer hitch pins in a series of seven vertical holes on the deck support pins.
Operating Instructions RECOMMENDATIONS FOR MOWING IMPORTANT: Operate the engine at full speed when mowing, to allow the engine to produce full horsepower and to increase efficiency of the engine cooling system. • Keep the mower deck and discharge chute clean. • Mow with sharp blades. A dull blade tears the • When using a side discharge mower deck, the side discharge shield must not be removed and must be kept in the lowest possible position to deflect grass clippings and thrown objects downward.
Operating Instructions RECOMMENDATIONS FOR TILT-UP DECK OPERATION/TRANSPORT To avoid potential deck and/or tractor damage while using the tilt-up deck, the following recommendations are offered: • Do not move the tractor with the deck in the tiltup position since both the roller wheels (on the back of the deck) and the GHS discharge chute may be damaged by moving the tractor. The tilt-up configuration should only be used when the tractor is parked.
Operating Instructions GRASS HANDLING SYSTEM (GHS) GHS Model Only Exhaust Screen (Removable) Catcher Door Safety Latch Grass-Pak® Vane Switch Powerfil ® Drive Motor Exhaust Deflector Actuator Rod “Full” Signal Horn Catcher Delivery Chute Catcher Door PTO Clutch Catcher Door Spring Shear Pin PTO and Blade Gear Drive Grass Catcher Dump Handle Shear Bolt Powerfil ® Delivery Spout Body Chute Assembly Blower Deck Discharge Chute Rear Discharge Mower Deck GHS Flow and Components 45
Operating Instructions General Information The Grass Handling System (GHS) consists of a rear discharge mower deck connected to a 10 in. (25 cm) blower and a rear mounted grass catcher with 7.0 bushel (246 liters) capacity or optional 9.5 bushel (335 liters) capacity. The GHS blower operates any time the mower blade clutch is engaged and moves grass through the rear discharge deck chute into the grass catcher. Blower airflow is exhausted out the back of the grass catcher, through a filtering screen.
Operating Instructions Clogging Checklist • Check the amount of flat section remaining at In case of clogging, there will be a distinct change in the sound of the blower, i.e., the blower sound will stop. Also, the mower deck will begin to leave a trail of grass clippings. When this occurs, stop the engine, disconnect the spark plug wires, and make sure all movement has stopped before attempting to unclog. blade tip. This is the area that is ground away (removed) when the blades are sharpened.
Operating Instructions • Check that the openings in the removable air exhaust screen in the grass catcher are not plugged. If the screen is clogged, refer to Cleaning the GHS Exhaust Screen in this section. NOTE: An optional exhaust screen with larger holes (3/4 is available for use when mowing in wet grass; the screen provides less airflow restriction and more clog resistance (use standard screen in dry conditions to avoid excessive material blowing out of the catcher).
Operating Instructions Dumping the Catcher For dumping, the catcher either tailgate dumps into a disposal area or dumps into the optional dump bag. The dump bag is a reusable nylon fabric bag designed to conveniently move grass clippings from the catcher to a remote disposal area or container. Tailgate Dumping 1. Open the back door by lifting on the door handle. NOTE: To prevent accidental door closure, a safety latch locks the door open in the fully opened position while the catcher is being dumped. 2.
Operating Instructions 3. Hook the bottom of the bag over the rear bumper while lifting on the handle strap(s). 4. Tilt the catcher back to dump into the bag by lifting on the catcher lift handle on the lower front corner of the catcher with the one hand while continuing to hold up on the bag strap(s) with the other hand. Refer to photos for positioning the bag and dumping.
Operating Instructions Door Actuator Arm Grass Catcher Catcher Door Gas Spring Cable Guide Lift Channel Power Dump Ram Actuator Fork Catcher Door Cable Rod Guide Cable Assembly Gas Spring Actuator Mount Assembly Dog Leg Assembly Rubber Bumper Power Dump Components 51
Maintenance Instructions CAUTION Maintenance procedures requiring special training or tools should be performed by a trained technician. MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL MT, MTEFI, MTL Service Item Daily x x x x x x x x x x 25 Hours 100 Hours 200 Hours Yearly Every 2Years Ref.
Maintenance Instructions IMPORTANT TIPS FOR CARE OF THE KOHLER ENGINE Fuel System • Fuel must be clean - free from water, dirt, and organic material. • Change fuel filter on a regular basis and when contamination is suspected or found in the fuel. • On the Model MTEFI, the fuel system is pressur- KOHLER TIPS • Operate the engine at full speed when mowing. This allows the engine to produce full horsepower and move more cooling air through the engine cooling fins.
Maintenance Instructions Oil KOHLER TIPS/LUBRICATION 1. • Use only multi-viscosity oils as specified with the viscosity matching ambient temperatures for the engine operating conditions. This will aid starting in cold weather and assure proper lubrication in hot weather. • Use only Kohler oil filters. Aftermarket filters may not seal properly and/or have the incorrect pressure relief valve for proper lubrication. LUBRICATION WARNING IMPORTANT: NEVER check or add oil with the engine running. 2.
Maintenance Instructions Changing Engine Crankcase Oil/Oil Filter For Model MT and MTEFI, change the engine crankcase oil after every 100 hours of operation and replace the oil filter every other oil change (every 200 hours of operation). For Model MTL, change the engine crankcase oil after every 200 hours of operation and replace the oil filter at the same time. 1. Park the mower on a level surface with the engine stopped. The engine oil should be warm before draining.
Maintenance Instructions Ident No.
Maintenance Instructions LUBRICATION 1 1 2 2 3 4 4 5 6 7 6 7 6 6 8 9 10 12 8 11 13 13 14 14 19 34 20 & 36 15 16 17 30 & 35 18 19 34 33 32 31 20 30 21 29 23 22 22 26 27 28 25 24 27 Chassis and Deck Lubrication Points 57
Maintenance Instructions LUBRICATION NOTE: In case the gearboxes are completely drained of oil, approximately 5 fl. oz. (15 cl) of oil per gearbox is required to refill the gear drive assembly. Mower Deck Gearbox Lubrication NOTE: These instructions apply to all mower decks with gear-driven blades. Refer to DSD52 or DSD62 Mower Deck Lubrication in this section for the DSD52 or DSD62 deck with belt-driven blades.
Maintenance Instructions 2. LUBRICATION Check the oil level in the belt drive gearbox every 100 hours (or sooner if a visible oil leak has developed). With the deck in the normal operating position, remove the level plug in the side of the gearcase. Add SAE E.P. (Extreme Pressure) 90W oil to maintain the oil level to the plug. If the oil level is low, check the gearbox for any indication of an oil leak. If an oil leak is noted, the gearbox will need to be removed and rebuilt. 3.
Maintenance Instructions LUBRICATION b. Hydrostatic Transmission Fluid Checking Hydrostatic Transmission Fluid Level * Slowly add fluid into the reservoir until fluid starts to leak from around the plug. (Transmissions are serviced from the factory with Mobil 1 (15W50) Synthetic Oil. When it is necessary to add fluid, refer to Specifications for the proper fluid.) * As soon as there is fluid leaking from around the air bleed plug, tighten the plug and fill the reservoir to the COLD level mark.
Maintenance Instructions LUBRICATION/CLEANING 3. Reinstall the lower drain plug, making sure the rubber O-ring on the plug is in place and in good condition. 6. Before installing the air bleed plug, fill the reservoir with fluid allowing a small amount to leak out of the air bleed plug hole. 4. Refill the transmission through the air bleed plug hole until it is as full as possible. 7. Install the air bleed plug and fill the reservoir to the COLD level line.
Maintenance Instructions CLEANING Turbine Precleaner The turbine precleaner is mounted on a remote air intake tube connected to the Donaldson air cleaner. A spinning fan driven by the intake airflow separates dust from the air, giving the initial stage of air cleaning. Dust particles are exhausted through a single small vent in the side of the housing. Since no dust is trapped, the precleaner operates without cleaning.
Maintenance Instructions 1. 2. 3. Release the top and bottom cover latches and remove the air cleaner cover. Wash the cover and Vacuator™ valve. Check that these components are in good condition. The Vacuator™ valve is subject to wear and deterioration and should be replaced yearly or when damaged. The lips of the valve should close and fit together; any cracks, deformation, or wear in the valve is cause for replacement. Remove the filter element by pulling it out of the canister.
Maintenance Instructions CLEANING Engine Cooling System - MT20 and MTEFI Engine Cooling Fin Access Panels Air Intake System To prevent engine overheating and possible engine damage, clean grass clippings, chaff, and dirt from the rotating engine air intake screen after every 8 hours of operation. In certain mowing conditions (dry grass, leaves, tree “cotton”, etc.), it may be necessary to check and clean the screen several times each day to prevent engine overheating.
Maintenance Instructions 2. CLEANING Inspect the radiator cooling fins for material lodged in this area which would restrict cooling airflow. Use pressurized air or water to clean. DO NOT use any tool, like a screwdriver or knife, to clean material out of the fins as this may damage the cooling fins. DO NOT use cold water on a hot radiator. IMPORTANT: Maintain proper coolant level in the radiator and coolant recovery tank.
Maintenance Instructions CLEANING NOTE: While some degree of material buildup in the mower deck housing can be tolerated, a point is finally reached where cutting quality deteriorates and clogging begins to occur because of too much buildup on the baffling and housing. 4. Lower the deck to the normal operating position and re-engage the deck lock levers. IMPORTANT: With the belt removed, the blower wheel must spin freely. Any binding or dragging of the wheel is an indication of dirt buildup.
CLEANING/ CHECKING/SERVICING Maintenance Instructions Hydrostatic Transmission Cooling Fins Keeping the cooling fins on the hydrostatic transmissions clean and free of obstruction is essential to avoid overheating the transmission fluid and shortening transmission life. The cooling fins should be checked every 100 hours; and cleaned if necessary. To clean the fins, use compressed air and/or a pressure washer.
Maintenance Instructions CHECKING/SERVICING IMPORTANT: The coolant solution of antifreeze and distilled water must be thoroughly pre-mixed before putting it in the engine (adding pure antifreeze into the radiator may cause damage to the engine by causing overheating). Important Battery Service, Installation, and Changing Tips for MTEFI: Security of Air Filtration Components • Do not allow the battery cables to touch CAUTION opposing terminals.
Maintenance Instructions CHECKING/SERVICING Cleaning the Terminals Wheel Bolt Torque If battery terminals are corroded, remove battery from the mower. Using a wire brush, remove corrosion with a solution of one part baking soda and four parts water. Rinse with clean water. Coat the terminals with petroleum jelly or terminal protector spray to retard further corrosion. Check every 100 hours the eight (8) lug bolts that mount the drive tires. They should be torqued to 75 to 85 ft-lb.
Maintenance Instructions CHECKING/SERVICING 6. WARNING DO NOT try to straighten a blade that is bent. NEVER weld a broken or cracked blade. ALWAYS replace with a new blade to assure safety. 4. If the blade cutting edge is dull or nicked, it should be sharpened. Remove blades for sharpening by grasping the end of the blade using a rag or a thick, padded glove, while loosening and removing the nut, lock washer, and flat washer that mounts the blade. 5.
Maintenance Instructions CHECKING/SERVICING Mower Deck Gearbox Oil Seals Radiator Hoses and Clamps - MTL The mower deck gearbox seals should be inspected every 25 hours for evidence of oil leaking; particularly the lower oil seal on the blade drive gearbox. This seal is protected by the trash guard on the blade hub and seal protector plate on the housing, but is still vulnerable to seal damage due to operating in an adverse environment.
Maintenance Instructions REPLACING/REPAIRING REPLACING/REPAIRING Drive Belts There are four (4) individual belts on GHS models or three (3) belts on SD models: DANGER To prevent accidental starting of the engine when replacing parts or repairing the machine, remove the key from the ignition switch and disconnect the spark plug wires. IMPORTANT: ALWAYS use genuine factory replacement parts. Substitute parts CAN result in product malfunction and possible injury to the operator and/or others.
Maintenance Instructions REPLACING/REPAIRING Engine PTO Drive Belt (3 Groove Power Band) 1. c. Raise the clutch lever (engage position) to lift the clutch idler away from the belt. d. Next remove the belt from the engine pulley and then the PTO drive pulley. To remove the engine PTO drive belt: a. Remove the jackshaft drive belt from its idler pulley (by pushing down on idler pulley) and let the belt drop down out of the way. 2.
Maintenance Instructions Jackshaft Drive Belt 1. REPLACING/REPAIRING b. Relax the belt by depressing the springloaded idler arm. c. Roll the belt off the jackshaft pulley and remove. To remove the jackshaft drive belt: a. Remove the engine PTO drive belt, as described in previous section. Push Idler Pulley Down to Relax Belt Jackshaft Idler Pulley Jackshaft Drive Belt Engine Pulley Tension Spring Jackshaft Drive Belt (Disengaged) 2.
Maintenance Instructions REPLACING/REPAIRING GHS Blower Drive Belt 1. Remove the GHS blower drive belt tension by depressing the idler pulley on the tightener arm. Roll the belt off the blower pulley and remove. Blower Drive Pulley GHS Blower Drive Belt Blower Pulley Depress Idler Pulley Down to Relax Belt Belt Tightener Idler Pulley (Disengaged) GHS Blower Drive Belt Assembly (Disengaged) Blower Drive Belt Spring Removal 2. Reverse the procedure to install the GHS blower drive belt.
Maintenance Instructions Hydrostatic Ground Drive Belt 1. REPLACING/REPAIRING b. Slide belt off pulleys, then release the idler. To remove the hydrostatic ground drive belt: a. Raise the spring-loaded belt tightener arm and idler pulley to relax belt. Belt Tightener Arm Jackshaft Idler Pulley Transmission Drive Pulley Spring Hydrostatic Ground Drive Belt Hydrostatic Ground Drive Belt Assembly (Disengaged) 2. Reverse the procedure to install the hydrostatic ground drive belt.
Maintenance Instructions Fuel Filter - Model MT and MTL REPLACING/REPAIRING Fuel Filter - MTEFI Models MT and MTL are each equipped with an inline fuel filter. Visually inspect the filter periodically, and replace the filter yearly. WARNING The MTEFI fuel system operates under high pressure. This system should be serviced by a Walker dealer or authorized Kohler service dealer. In-Line Fuel Filter Model MTEFI is equipped with a high-volume, highpressure, 10-15 micron, in-line fuel filter.
Maintenance Instructions After reinstalling the blade, check blade timing by moving blades through one (1) complete revolution. Make sure blade tips pass clear of each other. If timing is incorrect, refer to Mower Deck Gearbox Replacement in this section. REPLACING/REPAIRING Before operating the deck, inspect the blade overload shear bolts and also check blade timing (on gear driven decks) by moving blades through one (1) complete revolution. Make sure blade tips pass clear of each other.
Maintenance Instructions REPLACING/REPAIRING NOTE: With oil flow throughout the unitized gear drive assembly; if one gearbox has internal damage or excessive wear, the remaining gearboxes and connector tubes should be completely disassembled and thoroughly flushed out with solvent before reassembly. WARNING DO NOT try to straighten a blade that is bent. NEVER weld a broken or cracked blade. ALWAYS replace with a new blade to assure safety.
Maintenance Instructions REPLACING/REPAIRING 4. Mower Deck Gearboxes Remove the blower assembly from the chassis as follows: a. Remove the blower skid bar by removing front and rear mounting bolts from the skid bar (underneath the blower) and removing the bolt connecting the blower housing to the skid bar. b. Remove the blower belt tightener idler arm assembly by removing the pivot bolt. c. Remove two (2) bolts mounting the blower housing to the frame. d.
Maintenance Instructions REPLACING/REPAIRING Blower Wheel Installation 1. To install the blower wheel, reverse the removal procedures. The front bearing is mounted on the blower wheel shaft, secured by a locking collar. Drive the locking collar clockwise with a punch, and tighten the set screw. 2. Press blower wheel and front bearing into the blower housing. Use Loctite® RC/680 retaining compound on the outer bearing race and inside the bearing housing. 3.
Maintenance Instructions ADJUSTMENTS ADJUSTMENTS Steering Levers DANGER If the engine must be running to perform a maintenance adjustment, keep hands, feet, and clothing from moving parts. DO NOT wear jewelry or loose clothing. An adjustment range of approximately 3 inches is available on the steering levers - the levers can be adjusted forward or aft depending on the arm length of the operator.
Maintenance Instructions ADJUSTMENTS Blade Clutch (PTO) Clutch Engagement/Belt Tension The clutch engagement and PTO belt tension are adjusted using the clutch actuator rod. Initially, after installing a new PTO belt, after 10 hours and every 100 hours thereafter, check and adjust for the two dimensions in the clutch actuator rod as shown in the PTO Clutch Engaged and PTO Clutch Disengaged illustrations. Adjust the bolt head clearance [1/4 in. to 3/8 in. (6.35 mm to 9.
Maintenance Instructions ADJUSTMENTS Clutch Disengagement/Brake Action WARNING It is important to check and maintain blade brake action for safe operation of the machine. 2-1/8 in. (54 mm) The declutched or disengaged position of the blade clutch idler pulley is adjustable and is set to give belt release without excessive slack and to apply the blade brake. The blade brake is activated by the brake actuator rod linkage to the clutch idler pulley mechanism.
Maintenance Instructions ADJUSTMENTS Use the following procedures to check and adjust clutch disengagement and brake action: Stop Block Stop Block Eccentric Adjustment - Step 1 Use the stop block attached to PTO belt tightener arm to set the bottom position of the clutch idler pulley in the disengaged position. The stop block should contact the chassis to stop the clutch idler pulley from moving further down in the disengaged position.
Maintenance Instructions ADJUSTMENTS 2. Blade Clutch Idler Pulley 1/8 in. (3 mm) Stop Block PTO Belt Tightener After adjustments are complete, check blade brake action as described in CHECKING/SERVICING the Blade Brake Action in this section. If blades do not stop within five (5) seconds, check the following: a. Recheck 1/8 in. (3 mm) gap between stop block and chassis. b. Make sure clutch and brake linkage are working freely (no binding). c. Check the brake band lining. d.
Maintenance Instructions 3. ADJUSTMENTS Tighten the jam nut on the forward travel stop adjusting bolt. CAUTION NEVER attempt to disconnect any safety devices or defeat the purpose of these safety devices.
Maintenance Instructions ADJUSTMENTS Straight Ground Travel Adjustment - Step 4 Forward Speed Control Friction Lock 1. Sit in the seat, start the engine (operate at normal speed), and with the FSC in the NEUTRALPARK position check for forward movement of either drive wheel (if either wheel moves backward, refer back to Neutral Function Adjustment - Step 3 and readjust). Tighten the steering lever adjustment nut on the side of the mower with the wheel moving forward until wheel movement stops.
Maintenance Instructions Tilt-Up Deck Adjustable Stop When the carrier frame hinge joint is properly adjusted, the deck lock levers should move in and out of the engaged and disengaged positions freely. All four hitch pins used for height adjustment should sit flush on the washers above the deck pin bushing. On a level surface, if any pin is sticking up (likely the front pins), tighten the opposite side or loosen the existing side to lower the pin.
Maintenance Instructions Low Idle Mixture Needle Valve (May be Non-Adjustable) Fixed Main Jet Under Shutdown Solenoid Idle Speed Screw Carburetor Adjustment DANGER ADJUSTMENTS The fixed main jet carburetor is designed to deliver the correct fuel-to-air mixture to the engine under all operating conditions. The high idle is set at the factory and cannot be adjusted. The low idle mixture screw is also set at the factory and normally does not need adjustment.
Maintenance Instructions ADJUSTMENTS GHS “Full” Signal Horn with Grass-Pak® Switch WARNING If the GHS “full” signal horn is not sounding when the catcher is full, the following troubleshooting and adjustment instructions apply: 1. 2. DO NOT test the Grass-Pak® switch with the engine running. Projectiles CAN be thrown out of the grass delivery spout and CAN cause serious injury to bystanders or property damage. Check the horn. a.
Maintenance Instructions ADJUSTMENTS/ELECTRICAL SYSTEM ELECTRICAL SYSTEM Exhaust Screen For troubleshooting, refer to Wiring Diagram. 4 to 4-1/2 in. IMPORTANT: For Model MTEFI, an illuminated Engine Service Light on the control panel means that a fault has been detected in the electrical/fuel system. Contact an authorized Kohler Service Dealer to diagnose the fault. IMPORTANT: Disconnect both battery cables before unplugging any wiring connectors or making repairs on the electrical system.
Maintenance Instructions ELECTRICAL SYSTEM Wiring Diagram - Model MT R POWERFIL MOTOR BLK GRASS PAK SWITCH WALKER MODEL MT Beginning S/N 2001- 49592 R IGNITION SWITCH CIRCUITS ORG BLK BLK OFF RED + BLK STARTER STARTER SOLENOID WHT PUR PUR GRN GRN BLU BLK BLK OPTIONAL LIGHT B+A MAGNETO REGULATOR OIL PRESSURE SWITCH RELAY - B S1 = START CIRCUIT S2 = START/ACCESSORY CIRCUIT M = MAGNETO GROUND CIRCUIT B = BATTERY CIRCUIT A = ACCESSORY CIRCUIT G = GROUND CIRCUIT YEL WHT B + A / S1 + S2
Maintenance Instructions ELECTRICAL SYSTEM Wiring Diagram - Model MTEFI RED/WHT RED WALKER MODEL MT-EFI Beginning S/N 2001-49448 IGNITION SWITCH CIRCUITS G+M OFF B + A / S1 + S2 START B+A RUN WHT J21 BLK TAN BRN BLU ORG BLK BLK TO J5 TO J4 TO J8 PNK S1 = START CIRCUIT S2 = START / ACCESSORY CIRCUIT M = MAGNETO GROUND CIRCUIT B = BATTERY CIRCUIT A = ACCESSORY CIRCUIT G = GROUND CIRCUIT J1 = #1 FUEL INJECTOR J2 = #2 FUEL INJECTOR J3 = THROTTLE POSITION SENSOR J4 = OIL TEMP SENSOR J5 = OXYGEN S
Maintenance Instructions Wiring Diagram - Model MTEFI RED/WHT RED/ WHT 10 AMP FUSE J17 RED/ WHT POWERFIL MOTOR R R GRASS PAK SWITCH HORN + BLK BLK FUEL PUMP ELECTRICAL SYSTEM BLK ORG PUR ORG RED 20 AMP FUSE RED PUR 30 AMP FUSE BLK RED BLK STARTER RED STARTER SOLENOID YEL PUR BLU GRN J17 GRN BLK BLK OPTIONAL LIGHT REGULATOR OIL PRESSURE SWITCH OIL TEMP SWITCH CYLINDER HEAD TEMP SWITCH GRA GRA WHT PUR PUR WHT YEL YEL PUR RED OPTIONAL LIGHT RED BLK BLK BLK GRA
Maintenance Instructions ELECTRICAL SYSTEM WALKER MODEL MTL Beginning S/N 2001-54652 Wiring Diagram - Model MTL GRASS PAK SWITCH POWERFIL MOTOR ORG BLK/WHT BLK/WHT BLK RED BLK R IGNITION SWITCH CIRCUITS G+M OFF B + A / S1 + S2 START B+A RUN R ORG BLK/WHT BLK BLK S1 = START CIRCUIT S2 = START / ACCESSORY CIIRCUIT M = MAGNETO GROUND CIRCUIT B = BATTERY CIRCUIT A = ACCESSORY CIRCUIT G = GROUND CIRCUIT HORN + ORG/BLU WHT/ORG GRA RELAY - D BLU BRN RED 30 85 87 87A BLU BLU OFF START R
LIMITED WARRANTY FOR WALKER COMMERCIAL RIDER MOWER 1. WHAT THIS WARRANTY COVERS, AND FOR HOW LONG: Walker Manufacturing company will, at its option, repair or replace, without charge, any part covered by this warranty which is found to be defective in material and/or workmanship within one (1) year* after date of sale to the original retail purchaser unless the product is used for rental purposes, in which case this warranty is limited to ninety (90) days.
Sound - Model MT Vibration - Model MT Sound Test Vibration Level Sound test conducted was in accordance with 79/113/EEC and was performed on 22 March 96 under the conditions listed: Lwa 104 General Condition: LpA 96 OPERATOR 0.8g Clear o10 Tests were performed on 22 March 96 under the conditions listed: (C)o Temperature: 50 (F) Wind Speed: < 5 mph (< 8 kmh) Humidity: 52% Barometric Pressure: 24.
