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MAINTENANCE
EC72 03/08 Maintenance Section 5-5
© 2008 Alamo Group Inc.
MAINTENANCE
SHEAR PIN YOKE LUBRICATION
Yoke is supplied with a grease fitting to lube
between gearbox shaft and yoke. This allows yoke
to spin freely on gearbox shaft when pin shears.
Failure to lube may cause yoke to gall and spin
weld to shaft. Adding even small amounts of grease
will greatly prolong life of yoke. The shear bolt (1/2”
x 2-3/4”) MUST BE a Grade 2 to ensure that it
shears when high torque load is encountered.
When attaching PTO yoke to tractor PTO shaft, it is important that spring-activated locking
collar slides freely and locking balls are seated in groove on PTO shaft. A loose shaft could
slip off and result in personal injury or damage to cutter.
BLADE SERVICING
Inspect blades before each use to determine that they are properly installed and in good condition. Replace
any blade that is bent, excessively nicked, worn, or has any other damage. Small nicks can be ground out
when sharpening.
Use only original equipment blades on this cutter. They are made of special heat-treated
alloy steel. Substitute blades may not meet specifications and may fail in a hazardous
manner that could cause injury.
BLADE SHARPENING
When sharpening blades, grind each blade the same amount to maintain balance. Follow
original sharpening pattern as shown in Figure Mnt-R-0008. Always sharpen blades by
grinding. Always sharpen both blades at same time to maintain balance. The difference in
blade weights should not exceed 1 ounce. Unbalanced blades will cause excessive
vibration which can damage gear box bearings. Vibration may also cause structural cracks
in cutter housing. DO NOT heat and pound out edge. Do not sharpen blade to a razor edge,
but leave a 1/16” blunt edge. Do not sharpen back side of blade.
Avoid personal injury. Always block the cutter up to prevent if from falling when the blades
and/ or carrier are being serviced.
Replace bent or broken blades with new blades. NEVER ATTEMPT TO STRAIGHTEN,
WELD, OR WELD HARDFACING ON BLADES SINCE THIS WILL LIKELY CRACK OR
OTHERWISE DAMAGE THE BLADE WITH SUBSEQUENT FAILURE AND POSSIBLE
SERIOUS INJURY FROM THROWN BLADES.
(SGM-10)