TM 5-3810-231-12
(2) Inspect for cracks, breaks, worn rollers or
pins. Replace a defective or damaged
chain.
108. Crawler Track Tension
a. Adjustment (fig. 57).
(1) Propel the machine in a forward direction
at least the length of t he crawler frame.
This will place a II of the slack on top of
the crawler belt.
(2) Insert a hydraulic jack in the hole of the
frame.
(3) Apply tension to the crawler belt until the
link pins are resting firmly against the idler
roller and a dip in the crawler belt of
approximately 1 1/2 inches is maintained
at t he ends of the track rail.
(4) Secure the adjustment by inserting shims
as necessary.
(5) Secure shims with retainer pin and
remove hydraulic jack.
Figure 57. Crawler track ten-in adjustment.
Section XVI. HOOK ROLLER ASSEMBLIES
clearance is allowed between the roller
109. General
path and the hook rollers.
(4) Install the cap screws after the adjustment
The hook roller assemblies hold the revolving frame
is complete.
to the live roller circle when the machine rotates. They
are provided with eccentric type adjustment to
(5) Check the hook roller bracket for tightness
compensate for wear.
every time the hook rollers are adjusted.
If the machine is operated with loose hook
110. Hook Roller
roller bolts, severe damage to the entire
machine may result.
a. Adjustment.
b. Removal. Remove hook roller assemblies as
(1) When there is more than 1/16 inch gap
illustrated on figure 59.
between the lower side of the roller path
and the hook roller, the hook rollers (fig.
c. Cleaning, Inspection and Repair.
(2) Lower the boom to approximately the
(1) Clean all parts
with an
approved
horizontal position and adjust the front
cleaning solvent and dry thoroughly.
hook rollers.
(2) Inspect for cracks, breaks, and excessive
(3) Remove the cap screws and rotate the
wear. Repair or replace defective parts.
eccentric pin in either direction until the
roller is snug against the bottom of the
d. Installation. Install hook roller assemblies as
roller path. A maximum of 1/16 inch
illustrated on figure 59.
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