Walker MB (18 HP) Owner's Manual

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Contents

Walker MB (18 HP) Owner's Manual Manual pdf 51 page image

49Maintenance Instructions REPLACING/REPAIRINGFuel FilterModel MB is equipped with an in-line fuel filter.Visually inspect the filter periodically, and replacethe filter yearly.Fuel Filter LocationIMPORTANT: Replace the fuel filter only in a cleanarea where the fuel line and connections will not becontaminated by any dust and dirt.1. Expand and slide clamps on either side of thefilter away from filter and pull fuel lines off filter.2. Replace filter.Blade Overload Shear BoltsThe cutting blade is keyed to the blade hub by two(2) shear bolts (10-24 x 5/8 in. stainless steel ma-chine screws). These bolts are designed to shearand protect the blade drive gearbox from damage ifthe blade encounters a shock load.Cutting Blade Shear BoltsNOTE: Tightening the 5/8-18 blade mounting nutto 60 ft-lb (81.3 N·m) is also important for propershock load protection. It is important to not over-tighten the mounting nut since this defeats (over-rides) the function of the shear bolts.If these bolts shear, remove the blade and installnew bolts. Refer to CHECKING/SERVICING in thissection for Sharpen Mower Blades which describesthe blade removal and installation procedure.After reinstalling the blade, check blade timing bymoving blades through one (1) complete revolu-tion. Make sure blade tips pass clear of each other.If timing is incorrect, contact your Walker Dealer.PTO Shear PinThe PTO drive shaft connection to the deck gearboxhas a shear pin to provide shock load protection to themower deck drive. This system provides primaryshock protection in case of blade impact and willnormally shear before the individual shear bolts onthe blade hub.When the PTO pin has sheared, use the followingprocedure to replace it:1. Loosen the two bolts securing the PTO shaftguard on the deck; lift the guard off. (Holes inguard are slotted for easy removal.)DANGERGasoline is extremely flammable and canbe highly explosive. To minimize danger:• Use only an approved fuel container forgasoline.• DO NOT allow open flames or sparksnear the machine while performing main-tenance or refueling; DO NOT smokewhile working with fuel.• Wipe up spilled gasoline immediatelyand completely.In-LineFuel FilterCutting BladeShear Bolts