Walker MC (18 HP) Owner's Manual

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Contents

Walker MC (18 HP) Owner's Manual Manual pdf 70 page image

Maintenance Instructions REPLACING/REPAIRING66After 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, refer to Mower Deck GearboxReplacement in this section.PTO Shear PinThe PTO drive shaft connection to the deck gearboxhas a shear pin to provide shock load protection tothe mower deck drive. This system provides prima-ry shock 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.)2. Rotate U-joint on shaft to align the shear pinhole with the hole (and shear pin fragment) inthe shaft. Use a punch to drive the remainingportion of the old shear pin out.3. Install new shear pin and secure with cotter pin.PTO Shear PinIMPORTANT: Use only Walker P/N 8067-10shear pins for replacement to provide propershock protection -- these pins are hardened toshear under a specific amount of load.4. Reinstall the PTO shaft guard.Before operating the deck, inspect the blade over-load shear bolts and also check blade timing (ongear driven decks) by moving blades through one (1)complete revolution. Make sure blade tips passclear of each other. If timing is incorrect, refer toMower Deck Gearbox Replacement in this section.Mower BladesMower blades are removed and remounted as de-scribed in Sharpen Mower Blades instructions.During the course of sharpening and inspectingmower blades, if there are any of the following con-ditions of wear or damage, blades should be re-placed for reasons of safety and performance of themachine:• An excessive amount of the flat section of theblade has been ground away (removed) when theblade is sharpened. Replace the blade when lessthan a 3/4 in. (19 mm) flat section remains at theblade tip.• Examine ends of the blade carefully, especiallythe intersection where the flat section of the bladeturns up to form the “wing tip” (refer to Mower BladeProfile for Sharpening illustration in SharpenMower Blades instructions). Since sand and abra-sive material can wear metal away in this area, theblade should be replaced when metal thicknesshas worn to 1/16 in. (1.6 mm) or less.• Check the blades for straightness by markingblade tip position inside the deck housing and thenrotating the opposite end of the blade to the sameposition and comparing. If the difference in blade tiptrack is more than 1/8 in. (3 mm), the blade is bentand should be replaced.• Inspect the blade surface, especially in formedareas, for cracks. Replace the blade if any cracksare found.Cotter PinU-JointTube AssemblyShear PinSplit Spring PinU-JointShaft AssemblyDANGERWhen blades are operated over sandysoil, and if blades are allowed to wear, a“slot” may be worn into the wing tip ofblade. Eventually a piece of the blade maybreak off creating a serious potential forinjury or damage.