NPK M20C, Instruction Manual, Page: 102 / 152

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102
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SLEWING RING INSPECTION AND
MAINTENANCE
MEASURING MAXIMUM AXIAL MOVEMENT
1. While the unit is attached to the carrier, position the processor in a vertical position
as shown.
2. Lock the base of a dial indicator (t40) onto the lower frame of the processor.
Indicate the other end of the dial onto the top bracket face as shown. Using the
excavator, slightly rock the processor back and forth using slight stick movement.
Note the movement shown on the dial. Take this reading (d59) in four places. If
your readings are greater than shown, please contact the NPK Service Department
at 1-800-225-4379.
MODEL NEW MAXIMUM
in
(mm)
M20 <.010
(<0.25)
M28
<.010 (<0.25)
M38
<.010 (<0.25)
MAXIMUM
MODEL
ALLOWABLE
WEAR
in
(mm)
M20
0.138 (3.50)
M28 0.138 (3.50)
M38
0.138 (3.50)