Mower Blades

Maintenance Instructions

REPLACING/REPAIRING

2.Rotate U-joint on shaft to align the shear pin hole with the hole (and shear pin fragment) in the shaft. Use a punch to drive the remaining portion of the old shear pin out.

3.Install new shear pin and secure with cotter pin.

Set Screw

Shear Pin

Split Spring Pin

U-Joint

Tube Assembly

U-Joint

Shaft Assembly

Cotter Pin

PTO Shear Pin

IMPORTANT: Use only Walker P/N 8067-13 shear pins for replacement to provide proper shock protection -- these pins are hardened to shear 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 (on gear driven decks) by moving blades through one (1) complete revolution. Make sure blade tips pass clear of each other. If timing is incorrect, contact your Walker Dealer.

Mower blades are removed and remounted as de- scribed in the Sharpen Mower Blades instructions. During the course of sharpening and inspecting mower 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 the machine:

•An excessive amount of the flat section of the blade has been ground away (removed) when the blade is sharpened. Replace the blade when less than a 3/4 in. (19 mm) flat section remains at the blade tip.

•Examine ends of the blade carefully, especially the intersection where the flat section of the blade turns up to form the “wing tip” (refer to Mower Blade Pro- file For Sharpening illustration in Sharpen Mower Blades instructions). Since sand and abrasive ma- terial can wear metal away in this area, the blade should be replaced when metal thickness has worn to 1/16 in. (1.6 mm) or less.

DANGER

When blades are operated over sandy soil, and if blades are allowed to wear, a “slot” may be worn into the wing tip of blade. Eventually a piece of the blade may break off creating a serious potential for injury or damage.

•Check the blades for straightness by marking blade tip position inside the deck housing and then ro- tating the opposite end of the blade to the same po- sition and comparing. If the difference in blade tip track is more than 1/8 in. (3 mm), the blade is bent and should be replaced.

•Inspect the blade surface, especially in formed areas, for cracks. Replace the blade if any cracks are found.

WARNING

DO NOT try to straighten a blade that is bent. NEVER weld a broken or cracked blade. ALWAYS replace with a new blade to assure safety.

Reinstall the blades following procedure from Sharp- en Mower Blades instructions. If blades are re- placed, always use Walker original equipment blades to ensure safety and optimum performance. The quality and performance of replacement blades offered by other manufacturers cannot be guar- anteed, they could be dangerous.

CAUTION

ALWAYS use genuine factory replacement parts. Substitute parts CAN result in prod- uct malfunction and possible injury to the operator.