Walker MT Owner's Manual

Contents

63Maintenance Instructions CHECKING/SERVICING/REPLACING/REPAIRINGMower Deck Gearbox Oil SealsThe mower deck gearbox seals should be inspectedevery 25 hours for evidence of oil leaking; particu-larly the lower oil seal on the blade drive gear-box. This seal is protected by the trash guard on theblade hub and seal protector plate on the housing,but is still vulnerable to seal damage due to operat-ing in an adverse environment. The mower blademust be removed for inspection of the seal, so it isrecommended to inspect the gearbox seals whenblades are removed for sharpening. If an oil leakis noted, the seal should be replaced and the gear-box assembly relubricated. Refer to Mower DeckGearbox Lubrication in this section.Spark PlugsEvery 200 hours of operation, remove the sparkplugs, inspect, clean, and reset the gap (or replacewith new plugs). Before removing the spark plugs,clean the area around the base of the plugs to keepdirt and debris out of the engine. Clean spark plugswith a wire brush. DO NOT use an abrasive grit typecleaner. If the electrodes are burned short or pitted,replace plugs with Champion type RC12YC (orequivalent). Check spark plug gap with a wire-typefeeler gauge and set the gap at 0.030 in. (.76 mm).Reinstall and tighten to between 18 and 22 ft-lb(24.4 to 29.8 N⋅m).Fuel Lines and ClampsEvery year, inspect the fuel supply line from the tankto engine for deterioration or damage. Also, inspectthe fuel line clamps for tightness. Good preventivemaintenance calls for complete replace-ment of fuellines and clamps every two (2) years.Engine StarterYearly or every 500 hours disassemble and cleanthe solenoid shift starter. Refer to the Kohler ServiceManual for this procedure or contact an authorizedKohler engine dealer to perform this service.Blade Brake ActionCheck the function of the cutter blade brake (andblower brake on GHS models) by engaging the bladeclutch (PTO), operating the engine at full throttle, thendisengaging the clutch and measuring how quicklythe blades stop. Watch the rotation of the blade driveshaft and blower pulley as a visual indication thatmovement has stopped. If the brake is workingproperly, all rotation will stop five (5) seconds af-ter disengagement of the clutch. If the brake sys-tem malfunctions - blades do not stop in five (5)seconds - adjust or repair the brake before operatingthe mower. Refer to ADJUSTMENTS of BladeClutch (PTO) in this section.REPLACING/REPAIRINGIMPORTANT: ALWAYS use genuine factory re-placement parts. Substitute parts CAN result inproduct malfunction and possible injury to the oper-ator and/or others.Drive BeltsThere are four (4) individual belts on GHS modelsor three (3) belts on SD models:• Jackshaft Drive Belt• Engine PTO Drive Belt (3 Groove Power Band)• GHS Blower Drive Belt (GHS Model Only)• Hydrostatic Ground Drive BeltThe belts may be removed and replaced using theprocedures described on the following pages.WARNINGIt is important to check and maintain bladebrake action for safe operation of the ma-chine.DANGERTo prevent accidental starting of the en-gine when replacing parts or repairing themachine, remove the key from the ignitionswitch and disconnect the spark plugwires.