TM 9-2330-390-14&P
Table 4-2. Unit Troubleshooting (Con't).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8.
BRAKES DRAG.
Step 1.
Step 2.
step 3.
Step 4.
Step 5.
Step 6.
If rear wheels are affected, check operation of parking brake lever. Check that lever moves freely
up and down.
Replace damaged parking brake lever (see paragraph 4-69).
Check for properly adjusted brakes (see paragraph 4-59).
Perform minor brake adjustment (see paragraph 4-59).
If rear wheels are affected, check operation of airbrake chambers. Check for leaks in air lines to
and from airbrake chambers. Check for leaks or damage to airbrake chambers. Check that spring
in each airbrake chamber is fully released. Cage brakes (see paragraph 456).
Replace damaged airbrake chambers (see paragraph 4-61).
If brakes cannot be caged, replace damaged airbrake chambers (see paragraph 4-61).
Remove hub and brakedrum (see paragraph 4-75). Check for weak or broken brakeshoe return
springs (see paragraph 4-57).
Replace weak or broken brakeshoe return springs (see paragraph 4-57). Replace any other
damaged components (see paragraph 4-57).
Check for loose wheel bearings (see paragraph 4-75).
Adjust wheel bearings (see paragraph 4-75).
Check for damage to wedge assembly (see paragraph 4-60).
Replace damaged wedge assembly (see paragraph 4-60).
9.
BRAKES GRAB.
l DO NOT disconnect ait lines and fittings while dolly set airbrake system is
pressurized. Intervehicular air lines must be disconnected and air reservoirs drained
before air lines and fittings are disconnected. A line or fitting disconnected under
pressure may explode with great force and cause serious injury to personnel.
l Wear eye protection when working with compressed air to avoid serious eye injury.
NOTE
Refer to airbrake system schematics for assistance (see paragraph 4-74).
Step 1.
Perform airbrake system leakage check (see paragraph 4-23).
Replace damaged air lines (see paragraph 4-72 or 4-73).
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