Walker MBK23 Operator's Manual

Contents

55Maintenance Instructions CHECKING/SERVICINGSpark PlugsEvery 100 hours, remove the spark plugs, inspect,clean, and reset the gap (or replace with a newplug). Clean spark plug with a wire brush. If theelectrodes are burned short or pitted, replace theplug (refer to Specifications for the proper type ofreplacement plug). Check the spark plug gap witha wire-type feeler gauge and set the gap between0.028 and 0.032 in. (0.7 and 0.8 mm). Reinstall andtighten to 17 lb·ft (23.0 N·m). Both spark plugsshould be replaced yearly.Ignition WiresGood preventive maintenance calls for complete re-placement of spark plug wires every two (2) years.Fuel Lines and ClampsNOTE: The fuel system after the fuel pump moduleis pressurized and should only be serviced by aWalker dealer or authorized Kohler service dealer.Every year, inspect the fuel supply line from thetank to engine for deterioration or damage. Also,inspect the fuel line clamps for tightness. Goodpreventive maintenance calls for complete replace-ment of fuel lines and clamps every two (2) years.Blade Brake ActionWARNINGIt is important to check and maintain bladebrake action for safe operation of the ma-chine.Check the function of the cutter blade brake by en-gaging the blade clutch (PTO), operating the engineat full throttle, then disengaging the clutch and mea-suring how quickly the blades stop. Watch the rota-tion of the blade drive shaft as a visual indication thatmovement has stopped. If the brake is workingproperly, all rotation will stop five (5) secondsafter disengagement of the clutch. If the brake sys-tem malfunctions - blades do not stop in five (5) sec-onds - adjust or repair the brake before operatingthe mower. Refer to ADJUSTMENTS for ClutchDisengagement/Brake Action, Step 2 - Blade BrakeBand Adjustment, on page 69.PTO U-JointsThe PTO U-joints should be inspected yearly forlooseness and wear. If either is noticed, the respec-tive shaft or tube should be replaced. A worn U-jointcan cause vibration and extensive damage to thePTO and the whole machine.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.Safety Switch SystemWARNINGIt is important to check and maintain thesafety switch system for safe operation ofthe machine.There are three (3) safety interlock switches on thetractor; Seat Switch, FSC Neutral - Park Switch, andPTO Switch.If any of the following conditions occur during start-ing or operating, a safety interlock switch may bemalfunctioning. Contact your Walker dealer for trou-bleshooting and/or replacement.• With or without an operator in the seat, the enginestarts with the Forward Speed Control (FSC) and/orthe PTO engaged.• With an operator in the seat, the engine starts butdies soon after the Forward Speed Control (FSC) orPTO is engaged.• Without an operator in the seat, the engine con-tinues to run with the Forward Speed Control (FSC)and/or PTO engaged.• With an operator in the seat, the Forward SpeedControl (FSC) and PTO disengaged, and the OilPressure Warning Horn sounding, the starter will notengage.