TM 5-3810-231-12
Section XV. CRANE LOWER CRAWLER SECTION
105. General
The lower crawler section is the foundation of the
machine and must be kept in perfect operating
condition. All parts are designed to withstand hard wear
but careful inspection and periodic adjustments are
required for good operation. When the machine is
traveled through, or worked in mud or water, flush out
the gear case underneath the propel gear. Refer to
Lubrication Order (para 32).
B-REMOVAL
Figure 55 Continued.
If the lining is worn to the point where the cylinder
completely retracts and the brake does not hold, move
the pin on the cylinder to the second hole. To do this,
first load the spring by tightening nut (9) until pressure is
relieved from nut (4). Insert the pin, then back off on
nut (9) to obtain a clearance of one inch between the nut
and spring seat. Tighten the jam nut, then readjust the
Figure 55. Propel brake.
brake as just described.
106. Propel Brake
If the spring is not under enough tension to hold the
brake, tighten nut (4) until the spring is tight enough to
hold the brake with the cylinder in a retracted position.
a. Adjustment.
b. Removal.
Remove propel brake as shown in
When checking the propel brake adjustment, first
check to make sure the cylinder does not bottom or
close completely when the brake is in a set position.
Remove the lock plate (3, fig. 55A) and apply pressure
c. Cleaning and Inspection.
to the cylinder to release the brake. Turn nut (2) to
(1) Clean all parts with an approved cleaning
obtain a clearance of one quarter inch between the
solvent and dry thoroughly.
lining and the clutch drum, in the center of the bottom
(2) Inspect for cracks, breaks, loose rivets
shoe. Replacement of the lock plate completes normal
and worn linings. Replace a defective or
band adjustment.
worn brake band and parts as necessary.
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