OWNER’S MANUAL Safety, Assembly, Operating, and Maintenance Instructions Model MC (16 HP) (For Tractors with Kohler OHC-16 V-Twin Engine) ™ Please Read and Save These Instructions For Safety, Read All Safety and Operation Instructions Prior to Operating Machine Effective Date: 03-08-99 P/N 6000-1 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 ________________ 1 Operating Instructions_____________ HIGHLIGHTED INFORMATION _____________ GLOSSARY ____________________________ IDENTIFYING NUMBER LOCATIONS ________ ENGINE SERIAL NUMBER LOCATION ______ SERVICING OF ENGINE AND DRIVETRAIN COMPONENTS__________ 1 1 1 2 CONTROL IDENTIFICATION, LOCATION, AND FUNCTION _____________ Ignition Switch _______________________ Engine Choke________________________ Engine Throttle ______________________ Forward Speed Control
Table of Contents Maintenance Instructions __________ 40 MAINTENANCE SCHEDULE CHART _______ IMPORTANT TIPS FOR CARE OF THE KOHLER ENGINE _______________ Fuel System _________________________ Starting/Stopping _____________________ Cooling System ______________________ Air Cleaner System ___________________ Oil _________________________________ LUBRICATION _________________________ Engine Oil ___________________________ Engine Break-In Oil___________________ Checking Engine Crankcase Oil Level ____ Changing
General Information HIGHLIGHTED INFORMATION Walker Manufacturing recommends that any service requiring special training or tools be performed by an authorized Walker Mower Dealer. There are several general practices to be aware of in the area of safety. Most accidents associated with the operation or maintenance of a Walker Mower are caused by disregarding basic safety precautions or specific warnings. Such accidents, in most cases, can be prevented by being aware of the dangers present.
General Information SERVICING OF ENGINE AND DRIVETRAIN COMPONENTS Serial Number Tractor Serial Number Location Serial Number The detailed servicing and repair of the engine, hydrostatic transmission, and gearboxes are not covered in this manual. Only routine maintenance and general service instructions are provided. For the service of these components during the limited warranty period, it is important to find a local, authorized servicing agent of the component manufacturer.
Specifications MODEL MC ENGINE Manufacturer/Model Kohler TH16, 2 Cyl., Gasoline (Air-Cooled) Displacement 31.7 cu. in. (520 cc) HP (@ 3600 RPM) 16.0 Max. RPM (No Load) 3960 Governed RPM 3600 Max. Torque [ft-lb (N⋅ m) @ RPM] 26.2 (35.5) @ 2500 Idle RPM 1200 ± 75 Spark Plug Type Champion® RC12YC Spark Plug Gap .030 in. (.76 mm) Crankcase Capacity 1.5 qts (1.
Specifications MODEL MC TRANSMISSION (continued) Transmission Fluid Factory Service Mobil 1 Synthetic Motor Oil (15W-30) Transmission Fluid Capacity 1 qt (1 liter) Transmission Cooling Cooling Fan Mounted on Drive Pulley Ground Travel Speed Forward m.p.h. (km/h) Reverse m.p.h.
Specifications MODEL MC DIMENSIONS (continued) Height SD Model 37-1/2 in. (95 cm) GHS Model 44-1/2 in. (112 cm) Wheel Base (Tractor) 42-1/4 in. (107 cm) Tread Width (Tractor) Standard Tires 28-1/4 in. (72 cm) Optional Tires 29-3/4 in. (76 cm) MOWER DECK Width of Cut SD/GHS 36 or 42 in. (91 or 107 cm) Cutting Height 1 to 4 in. (3 to 10 cm) Height Adjustment 7 Positions - 1/2 in. (1 cm) Increment Hitch Pins Installed in Multi-Position Deck Support Blade Size 36 in. (91 cm) SD Model 20 in.
Specifications MODEL MC GHS SYSTEM (Optional) Blower 4 x 10 x 1/4 in. (10 x 25 x 1 cm) Three-Blade Paddle Wheel (Driven by Mower Engine) Blower Brake Band Brake (Works in Combination with PTO Clutch, Stops Blower within Five (5) Seconds of PTO Disengagement) Max. Blower Speed 3600 RPM Grass Catcher Capacity 63 Gallons (238 liters)/6.7 Bushels Optional Grass Catcher Capacity* 89 Gallons (335 liters)/9.
Component Identification NOTE: Control Identification shown in Operating Instructions section. Catcher Door Safety Latch Turbine Precleaner Grass Handling System 6.
Component Identification Removable Grass Catcher Screen (Not Visible) Catcher Door Gas Spring Catcher Exhaust Deflector Catcher Lift / Dump Handle Catcher Door Catcher Door Handle Anti-Scuff Roller Deck Lift Rod Muffler Left Hand Drive Wheel Tailpipe Oil Oil Drain Filter Plug Tailwheel Fork and Wheel Rear View and Left Side View 8
Component Identification Rubber Bumper (Body Support) Air Restriction Indicator (Not Visible) Donaldson Air Cleaner Air Cleaner Cover Oil Fill Cap Rubber Bumper (Body Support) Air Intake Hose Muffler Fuel Filter Throttle and Choke Linkage Fuel Pump Fuel Tank Cap Muffler Heat Shield Precleaner Tube Oil Dipstick Jackshaft PTO Clutch Lever GHS Blower Turbine Precleaner RH Hydrostatic Transmission PTO Gearbox Dipstick RH Transmission Lockout Lever LH Hydrostatic Transmission 30 Amp Circuit Breaker
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 10. Disengage the blade drive when transporting the machine across drives, sidewalks, etc. Never raise the mower deck while blades are rotating. 17. In case of a clogged or plugged mower deck or GHS catching system: 11. The maximum recommended side slope operating angle is 20 degrees or 33% grade. When operating the machine on a slope, reduce speed and use caution to start, stop, and maneuver.
Safety Instructions 4. Perform only maintenance instructions described in this manual. Unauthorized maintenance operations or machine modifications may result in unsafe operating conditions. 5. If the engine must be running to perform a maintenance adjustment, keep hands, feet, and clothing away from moving parts. Do not wear jewelry or loose clothing. 6. Always use the proper engine service manual when working on the engine.
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 Dry Battery Service Walker Mowers are shipped partially assembled. After uncrating the tractor and mower deck, initial setup is required. DANGER Activating a battery can be dangerous. The battery should be taken to a reliable service station, battery store, or power equipment dealer where a trained technician can activate the battery safely. DO NOT attempt to activate the battery unless you are experienced in battery service work.
Assembly Instructions 3. After the battery is filled with electrolyte, replace the filler caps and charge the battery. Refer to Battery Charging. WARNING Make sure the battery cap vents are open. Improper venting of the battery COULD cause a battery explosion. Battery Charging DANGER BATTERIES PRODUCE EXPLOSIVE GASES Battery Clamp Secured by Wing Nut(s) • Charge the battery in a well-ventilated area, so that gases produced while charging can dissipate.
Assembly Instructions Deck Discharge Shield Installation (Side Discharge Models Only) Grease Fitting Locations 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 NOTE: When installing the DSD52 Mower deck, make sure to retract the dolly wheel after mounting the deck on the tractor. 3. Spring-Loaded Coupler Ring In Fully Forward Position If the deck is rear discharge (GHS equipped model), the rear discharge chute will need to be aligned and connected to the blower inlet during the last 2 in. (51 mm) of slide action on the support arms. NOTE: Raising the mower body may be helpful in fitting and guiding the deck chute into the blower. 4. 5.
Assembly Instructions NOTE: A block of wood cut 4 in. (102 mm) high is a convenient gauge to measure blade height above ground during the leveling process. Spring Tension Adjustment Nut Located Under Lower Spring Hook (Not Visible) WARNING The machine must be shut off during this procedure. Counterweight Springs Clip Onto Body With Body Tilted Up Hitch Pins Lock Deck On Support Arms 2. Check the side-to-side level.
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 GEAR AXLE OIL LEVEL Counterweight Spring Clip Refer to Gear Axle Lubrication in Maintenance Instructions. Deck Lift Rod INSPECT FOUR (4) DRIVE BELTS Engine PTO Drive, Jackshaft Drive, Hydrostatic Ground Drive, and GHS Blower Drive (if equipped). CHECK HYDROSTATIC TRANSMISSION OIL LEVEL Refer to LUBRICATION for Checking Hydrostatic Transmission Fluid Level in Maintenance Instructions.
Assembly Instructions CAUTION Do not operate machine with deck tilt-up pivot joint unlocked. DANGER Do not operate the mower with deck in tiltup position. Do not move the tractor with the deck in the tilt-up position. 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.
Operating Instructions CONTROL IDENTIFICATION, LOCATION, AND FUNCTION 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. Ignition Switch The ignition switch is located on the right front of the body and is used to start and stop the engine.
Operating Instructions Forward Speed Control (FSC) OFF ON START Ignition Switch Engine Choke The choke control lever (black knob) is located on the left side of the seat. To start a cold engine, move the choke control forward to the ON position. After engine starts, move the choke control toward the OFF position, keeping enough choke to allow the engine to run smoothly as it warms up. As soon as possible, move the choke to the OFF position. A warm engine requires little or no choke for starting.
Operating Instructions Parking Brake The parking brake functions by locking a pin into the hydrostatic transmission pinion gear teeth. Moving the lever FORWARD engages the parking brake; moving the lever BACKWARD releases the brake. 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 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) Forward Position (No Control Change) Full Forward Ground Speed Position Intermediate Ground Speed Position Neutral-Park Position Reverse Drive Wheel Motion Position Neutral-Park Position BLADE CLUTCH (PTO) Pull Up to Engage Disengaged Position ON Position Fast Throttle Position Engaged Position E
Operating Instructions IMPORTANT: If the engine fails to start after approximately 10 seconds of cranking, the engine should be checked before further cranking. Turn the key to the OFF position and allow a 60 second cool-down period between starting attempts. Failure to follow these guidelines can damage the starter motor and shorten battery life. STARTING THE ENGINE CAUTION Before operating the mower, read and understand all Safety Instructions and Operating Instructions. 3.
Operating Instructions 1. Move the FSC out of NEUTRAL-PARK position to the desired forward speed. DO NOT hold forward on steering levers. It is not necessary to hold the FSC lever in position since a friction lock maintains the selected lever position (and forward travel speed). Pull Steering Levers With Left Hand NOTE: If the FSC lever will not stay in the selected position, the friction lock needs to be adjusted. Refer to ADJUSTMENTS of Forward Speed Control Friction Lock in Maintenance Instructions.
Operating Instructions ENGAGING THE MOWER 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 Engaged Position A safety interlock switch (seat switch) will cause the engine to stop if the blade clutch is engaged and the operator is not in the seat.
Operating Instructions IMPORTANT: DO NOT disengage the blade clutch with high engine speed (above 1/2 throttle) since the brake action on the blade drive will cause premature wear of the brake band. ADJUSTING CUTTING HEIGHT 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.
Operating Instructions 3. The mower will “freewheel” with the levers in the LOCKOUT position. The levers must be in the highest position to completely unlock the transmissions. RECOMMENDATIONS FOR MOWING Lockout Lever • Keep the mower deck and discharge chute clean. 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. • Mow with sharp blades.
Operating Instructions • 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. Orient the side discharge away from sidewalks or streets to minimize cleanup of clippings. When mowing close to obstacles, orient the side discharge away from obstacles to reduce the chance of damage to property by thrown objects.
Operating Instructions GRASS HANDLING SYSTEM (GHS) GHS Model Only Catcher Door Safety Latch Grass-Pak® Vane Switch Exhaust Screen (Removable) Powerfil ® Drive Motor Exhaust Deflector Actuator Rod Catcher Door “Full” Signal Horn Delivery Chute Catcher Door Spring PTO Clutch Grass Catcher PTO and Blade Gear Drive Dump Handle Powerfil ® Delivery Spout Body Chute Assembly Blower Rear Discharge Mower Deck Deck Discharge Chute GHS Flow and Components 34
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 6.7 bushel (238 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 • Check the amount of flat section remaining at Clogging Checklist 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. DANGER NEVER place hands under the mower deck or in the GHS blower discharge chute.
Operating Instructions Remember, anything that restricts airflow or material flow along the entire path from the mower deck to the grass catcher can cause clogging. Using the Tilt-Up Deck Refer to CLEANING of Grass Buildup in Mower Housing for Tilt-Up Decks in Maintenance Instructions.
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. Safety Latch Open the back door by lifting on the door handle.
Operating Instructions 3. Hook the bottom of the bag over the rear bumper while lifting on the handle strap. 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 with the other hand. Refer to photos for positioning the bag and dumping.
Maintenance Instructions CAUTION Maintenance procedures requiring special training or tools should be performed by a trained technician.
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. KOHLER TIPS Air Cleaner System • Use only Donaldson air cleaner elements. Aftermarket elements may not seal in the air cleaner housing, allowing dirt to enter the engine.
Maintenance Instructions LUBRICATION LUBRICATION 4. WARNING IMPORTANT: DO NOT operate engine without a sufficient oil supply in the crankcase. DO NOT operate with the oil level below the “L” mark or above the “F” mark on the dipstick. DO NOT attempt to lubricate the machine with the engine running. Disengage the PTO clutch, shut off the machine, and remove the ignition key. 5. Proper lubrication is an important maintenance procedure. It reduces wear and makes the machine quieter and easier to operate.
Maintenance Instructions 1. Park the mower on a level surface with the engine stopped. The engine oil should be warm before draining. If not warm from operation, start the engine and run a few minutes to warm the oil. 2. Before removing the dipstick and oil fill cap, clean the area around them to keep any dirt or debris out of the engine. 3. Remove the dipstick, oil fill cap, and oil drain plug and drain the oil into a suitable container. Be sure to allow ample time for complete drainage.
Maintenance Instructions Ident No.
Maintenance Instructions LUBRICATION Chassis and Deck Lubrication Points 45
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 Mower Deck Lubrication in this section for the DSD52 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 Hydrostatic Transmission Fluid b. If no fluid leaks from around the air bleed plug: Checking Hydrostatic Transmission Fluid Level * Slowly add fluid into the reservoir until fluid starts to leak from around the plug. (When it is necessary to add fluid, use only the factory service fluid noted in TRANSMISSION Specifications in this manual.
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 Cover 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 2. Remove the filter element by pulling it out of the canister. There will be some initial resistance as the filter seal breaks loose and slides off of the outlet tube. Gently move the end of the filter up and down and side to side or twist to loosen the seal. Use gentle action to minimize the amount of dust dislodged as the filter is removed. 3. Clean the filter element using low pressure compressed air [less than 100 PSI (689 kPa)].
Maintenance Instructions CLEANING Engine Cooling System 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 CLEANING DANGER NEVER operate cutter blades with the deck in the raised position. 1. Raise the deck lock lever handle on each side of the carrier frame and pull out to release carrier frame for tilting action. 2. Using the carrier frame lift handle, raise deck to the TILT-UP position and insert the deck hook into the tilt-up latch on the tractor body.
Maintenance Instructions CLEANING GHS Blower Normally, the GHS blower operates with no maintenance or cleaning. However, when mowing grass that is dirty and damp (especially springtime mowing), a deposit of dirt may accumulate inside the blower housing, causing wear and binding of the blower wheel. When operating in these conditions, inspect the blower frequently for dirt buildup. NOTE: A visual clue of binding of the blower wheel is the blower blade tips are polished from rubbing on dirt.
CLEANING/ CHECKING/SERVICING Maintenance Instructions 2. Inspect the air intake hose for cracks, nicks, cuts, etc., and check the hose clamps for tightness. Battery NOTE: For initial battery service during setup, refer to Battery Service in Assembly Instructions. Electrolyte Level Cooling Fan The battery electrolyte level should be checked after every 25 hours of operation. To check electrolyte level: Cooling Fins 1. Remove battery cell filler caps. 2. Check the electrolyte level.
Maintenance Instructions CHECKING/SERVICING DANGER DANGER BATTERIES PRODUCE EXPLOSIVE GASES NEVER operate cutter blades with the deck in the raised position. • Charge the battery in a well-ventilated area, so that gases produced while charging can dissipate. 3. • Keep sparks, flames, and smoking materials away from the battery at all times. • Make sure the battery cap vents are open (check manifold vent on each cap).
Maintenance Instructions Sharpen at Original 30° Angle CHECKING/SERVICING Intersection Wear Area Wing Tip 30° Do Not Grind or Sharpen on Underside Mower Blade Profile For Sharpening 6. Check blade balance by positioning the blade horizontally on a blade balancer or use a nail or shaft through the center hole. If either end of the blade rotates downward, grind (remove) metal on that end until the blade will balance. The blade is properly balanced when neither end drops.
CHECKING/SERVICING/ REPLACING/REPAIRING Maintenance Instructions Engine Starter REPLACING/REPAIRING Yearly or every 500 hours, clean and lubricate the splines on the starter drive shaft. Refer to the Kohler Service Manual for this procedure or contact an authorized Kohler engine dealer to perform this service. Engine Valve Clearance Yearly or every 500 hours, check and adjust the Kohler engine valve clearance.
Maintenance Instructions REPLACING/REPAIRING Jackshaft Drive Belt Engine PTO Belt GHS Blower Belt (GHS Model Only) Hydrostatic Ground Drive Belt Belt Locations 59
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.
Maintenance Instructions REPLACING/REPAIRING Jackshaft Drive Belt 1. 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 by unhooking the belt tension spring from the hook on the chassis frame (located above the blower pulley). Lift the belt tightener idler pulley up and roll belt off the pulleys. Blower Drive Pulley Blower Pulley Chassis Frame Hook GHS Blower Drive Belt Spring Removed Belt Tightener Idler Pulley (Disengaged) GHS Blower Drive Belt Assembly (Disengaged) Blower Drive Belt Spring Removal 2.
Maintenance Instructions REPLACING/REPAIRING Hydrostatic Ground Drive Belt 1. To remove the hydrostatic ground drive belt: a. b. Slide belt off pulleys, then release the idler. 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 REPLACING/REPAIRING Fuel Filter Turn Valve Clockwise to Close Model MC is equipped with an in-line fuel filter. Visually inspect the filter periodically, and replace the filter yearly. In-Line Fuel Filter Fuel Shut-Off Valve and Filter Blade Overload Shear Bolts The cutting blade is keyed to the blade hub by two (2) shear bolts (10-24 x 5/8 in. stainless steel machine screws).
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. PTO Shear Pin (After S/N 99-37748) The PTO drive shaft connection to the deck gearbox has a shear pin to provide shock load protection to the mower deck drive.
Maintenance Instructions WARNING REPLACING/REPAIRING 4. 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. Reinstall the blades following procedure from Sharpen Mower Blades instructions. If blades are replaced, always use Walker original equipment blades to ensure safety and optimum performance.
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.
REPLACING/REPAIRING/ ADJUSTMENTS Maintenance Instructions ADJUSTMENTS 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. Safety Switches Wheel Puller Hooked to Lugs on Bearing Housing Pressing Blower Wheel Out of Housing Seat Switch Adjust switch position in body panel to achieve a 1/32 to 1/16 in. (.79 mm to 1.
Maintenance Instructions ADJUSTMENTS Steering Levers 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. The levers can be adjusted by loosening the locknut at the pivot point and the locknut holding the lever in position in the adjustment slide. Adjust levers into most comfortable position and tighten both locknuts.
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 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. The brake is designed to stop the blades within five (5) seconds after disengaging the clutch.
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 ADJUSTMENTS Steering Lever Actuator Arms CAUTION NEVER attempt to disconnect any safety devices or defeat the purpose of these safety devices. Forward Travel Stop Bolt FSC Actuator Clevis Steering Adjustment Nut Forward Speed Control Stop and Steering Lever Adjustment LH Steering Lever (For Orientation) Neutral Safety Switch Steering Lever End Play Adjustment - Step 2 1. Position the FSC lever to the most FORWARD position. 2.
Maintenance Instructions ADJUSTMENTS Straight Ground Travel Adjustment - Step 4 Forward Speed Control Friction Lock 1. The FSC friction lock is adjusted to hold the selected forward speed when the steering levers are moved and yet the friction is not too heavy to make moving the control difficult (too much friction). The procedure for checking and adjusting the FSC friction lock is as follows: 2.
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 same side to lower the pin.
Maintenance Instructions ADJUSTMENTS b. Turn the ignition switch ON and move the blade clutch to the ENGAGED position (engine not running). c. Open the catcher back door and trigger the Grass-Pak® vane by hand as it oscillates. Low Idle Speed Adjusting Screw WARNING PINCH POINT - SPRING LOADED DOOR Carburetor Adjustment 2. Place the throttle control into the idle or slow position. Turn the low idle speed adjusting screw in or out to obtain a low idle speed of 1200 rpm (± 75 rpm).
ADJUSTMENTS/ ELECTRICAL SYSTEM Maintenance Instructions Adjustment (When Horn Sounds at the Wrong Time) ELECTRICAL SYSTEM Very little, if any, adjustment to the Grass-Pak® switch is required. However, to fine tune the timing of the full signal, the vertical position of the switch vane is adjustable approximately 3/4 in. (1.9 mm). For troubleshooting, refer to Wiring Diagram. 1. 2. Loosen the screw mounting the vane on the switch and adjust the position of the vane as follows: a.
Maintenance Instructions ELECTRICAL SYSTEM Wiring Diagram - Model MC 79
Operator’s Notes 80
Operator’s Notes 81
Operator’s Notes 82
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.
Lwa 105 Sound - Model MC Vibration - Model MC Sound Test Vibration Level Sound test conducted was in accordance with 79/113/EEC and was performed on 28 January 98 under the conditions listed: 0.7g Vibration levels at the operators handles were measured in the vertical, lateral, and longitudinal directions using calibrated vibration test equipment.
