24 MHP Operating & Maintenance Manual
MAINTENANCE
5. Using a micrometer, measure how far the main shaft protrudes past the main bearing, as shown in Figure
31. Record this measurement as “Measurement A”.
6. Measure the wear on the right hand end cap, as shown in Figure 31. Record this measurement as
“Measurement B”.
7.
Subtract “Measurement B” from “Measurement A”. The difference will be the total thickness of shims.
MEASURE FOR SHIMS
Figure 31
SHIMMING
1. Using the shim thickness table, put together shims that
equal the shim thickness from Figure 31.
2.
Install shims on the right hand side of the pivot group.
3.
Install the right hand end cap. Apply Loctite 242 to the
cap screw threads.
4. Using a crane, slowly open and close the upper jaw. If
shimmed properly, the jaw will move with slight drag.
5. Install the left hand end cap.
6.
Torque the right hand and left hand main pivot group
bolts to 400 ft. lbs. (550 Nm).
7. Reinstall the front cylinder.
8.
Check play as shown in “Check for End Play” on page
MEASUREMENT A
MEASUREMENT B
A
B
MEASUREMENT A
MEASUREMENT B
-
=
SHIM THICKNESS
Shim Thickness Table
Shim Color
Shim Thickness
BLUE
0.005 inches
BROWN
0.010 inches
YELLOW
0.020 inches
STEEL
0.060 inches
SHIMS
SHIM RIGHT HAND SIDE
Figure 32
