WORKMASTER GO-A8-PW Operator's Manual page 29

4. The ROTOR (26) is the rotating member of the motor that transmits the
torque produced by the Blades. It is machined of heat-treated steel and
then ground to precise dimensions. Slots are milled in the body to accept
the Blades. The front-end of the Rotor Spindle is splined for driving the
HAMMER CAM (31). Examine the end faces of the Rotor for roughness
and smooth them with an India Hone if necessary. Normally, there should
be no noticeable wear on these faces, since the Rotor is .003" (approx.)
shorter than the Cylinder. Inspect the Blade slots for wear or burrs. A
new Blade should move in and out of the slot freely. If necessary, use a
honing stone to break away any sharp edges found on the corners of the
slots of the Rotor. Examine the spline or gear teeth at the driving end. If
they have become so worn that a step can be seen next to mating
surfaces, then the Rotor should be replaced.
5. The CYLINDER PLATES (24) are machined from low-carbon steel.
They provide support to the Front and Rear Bearings and enclose the
Cylinder ends. The Ball Bearings are located in each Cylinder Plate and
support the Rotor. If the face of the Front or Rear End Plate shows wear
greater than a depth of .005" (or if Cylinder Plate is cracked) it should be
replaced. Such wear is usually caused by incorrect Rotor spacing or a
dirty air supply. Light score marks can often be lapped out with a 150 grit
abrasive cloth on a flat surface plate.
6. The BEARINGS (69) provide a low friction support medium for the
Rotor. To check the condition of a Bearing, hold the inner race and rotate
the outer race by hand. If rough movement or substantial side-play are
detected, replace the Bearing. It is also possible to compare a used
Bearing with a new one to detect the amount of wear.
IMPORTANT
Open bearings may be washed in a fresh, clean
solvent and then re-packed with a good quality
bearing grease.
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