Walker MDD (20.9 HP) Owner's Manual

Also see for MDD: Owner's manual Owner's manual

Contents

Maintenance Instructions KUBOTA TIPS47IMPORTANT TIPS FOR CARE OF THE KUBOTAENGINEFuel System• Fuel must be clean - free from water, dirt, and or-ganic material. Fuel contamination will greatly short-en the life of the fuel injection pump and injectors.• Change fuel filters on a regular basis and whencontamination is suspected or found in the fuel.• Model MDD is equipped with an electric fuelpump; therefore it is normally not necessary to bleedair out of the fuel system (after running out of fuel orfuel system maintenance).• When checking and bleeding the fuel system usethe air vent plug on the fuel filter and the injectorpump. DO NOT attempt to bleed the fuel system byloosening fuel lines on the fuel injection pump as thiscould damage the pump.Starting/Stopping• DO NOT use ether or any starting fluid in theair intake. This will damage the engine.• For starting in cold weather [below 40° F (4° C)],use the cold start lever to release the hydrostatictransmissions from the starter cranking load.• Start engine with the throttle advanced off idle(1/4 to 1/2 throttle). This will aid starting, especiallyin cold weather.• Keep the battery fully charged.• Match crankcase oil viscosity to the ambient tem-perature, allowing the engine to crank faster andstart easier.• Allow engine to run at idle for a few seconds be-fore stopping engine to avoid run-on or backfiring.Cooling System• Fill the cooling system with a pre-mixed solutionof 50/50 antifreeze (ethylene glycol) and distilledwater.IMPORTANT: Solution must be pre-mixed beforeputting it in the engine (adding pure antifreeze intothe radiator may cause damage to the engine bycausing overheating).• Maintain proper fluid levels in the radiator andoverflow tank.• Operate the engine at full speed when mowing.This will allow the engine to produce full horsepowerand move more cooling air through the radiator.Air Cleaner System• Use only Donaldson air cleaner elements. After-market elements may not seal in the air cleanerhousing, allowing dirt to enter the engine. Also, af-termarket filters often skimp on the filtration mediaand require more frequent cleaning and replace-ment (see following instructions).• Use the air flow restriction gauge to indicate theneed to service the air filter.• DO NOT overservice or frequently “disturb” theair filter. A dirty air filter actually cleans better thana new one. Changing and cleaning the filter too of-ten can actually reduce filter efficiency and increasethe opportunity for traces of dust to enter the engine.Wait until the element really needs servicing as indi-cated by the air flow restriction gauge.• Do frequently check the Turbine Precleaner forfree movement of the internal fan.• When the air filter element is removed or re-placed, make sure all dust is cleaned out of the aircleaner housing and hose. Use a damp cloth andwipe the interior of the canister and hose clean (alittle dirt left here will be sucked into the engine andreduce engine life). When the filter is reinstalled,make sure the element is held tight and straightin the canister for proper seating and sealing.• Periodically check the air intake hose for cuts,nicks, etc., and the hose clamps for tightness.Oil• Use any top quality oil with an API classification ofCD or greater. DO NOT use oil that is rated for gas-oline engines only (API SE/SF) as this will causeproblems in a diesel engine.• Single viscosity or multi-viscosity oils may beused with the viscosity matching ambient tempera-tures for the engine operating conditions. This willaid starting in cold weather and assure proper lu-brication in hot weather.• Use only Kubota oil filters. Aftermarket filtersmay not seal properly and/or have the incorrectpressure relief valve for proper lubrication.