OPERATING
BETTCHER
AIRSHIRZ
®
INSTRUCTIONS
INDUSTRIES, INC. Rev. September 24, 2016
Page 50
9.3.5
Replacing Blade Pivot Bushings
Significant wear in any of the components usually indicates wear in mating components; therefore
all the pivoting parts should be replaced at once. However, do not interchange blades from other
blade sets. They are manufactured as a matched pair.
WARNING
KEEP THE BLADES CLOSED WHENEVER POSSIBLE
,
AND WEAR A CUT RESISTANT GLOVE
ON THE HAND HOLDING THE BLADES
.
First, remove the blade screw. (See Figure #40)
This screw normally floats loosely, being trapped by a secondary set of threads inside the locknut.
To engage these threads, pull outward on the head of the screw while rotating it counterclockwise.
Failure To Remove This Screw Before Proceeding Will Damage The Threads, Causing It To
Become Stuck
.
Use a 5/8 inch open end wrench to unscrew the locknut (counterclockwise). Remove the plastic
washer and the movable blade. Grasp the fixed blade and push the pivot bushing out of the hole.
Thoroughly clean the pivot hole and mating surfaces of both blades. Inspect the drive slot and
pivot hole of the movable blade for excessive wear. The blade set should be replaced if the surface
of the slot is worn noticeably deep or the edges are rolled outward. In this case, also check the
condition of the drive roller (see Section 9.4.12). A worn pivot hole will appear egg-shaped. If the
hole wear is not too deep, the installation of a new pivot bushing may take up enough clearance to
make the blades usable. Excessive wear causes excessive free play in the blades which leads to
inconsistent cutting action.
If the pivoting parts are to be reused, they must be thoroughly cleaned. Place the plastic washer
onto the locknut.
