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TM 5-4210-233-14&P-1
Table 4-2 Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HYDRAULIC SYSTEM - Continued
9
SWING OPERATION SLOW IN ONLY ONE DIRECTION
Check for clogged or restricted directional control hose.
Disconnect the appropriate hose connecting the swing crossover relief manifold block to the
turntable control valve. Remove obstruction or replace hose (see para 4-9).
10
SWING OPERATION ERRATIC IN ONE DIRECTION ONLY
Step 1. Turntable bearing binding due to continuous duty and lack of lubrication.
Rotate machine in both directions several times.
Step 2. Check for clogged or restricted directional control hose.
Disconnect the appropriate hose connecting the swing crossover relief manifold block to the
turntable control valve. Remove obstruction or replace hose (see para 4-9).
11
NO SWING OPERATION IN EITHER DIRECTION
Step 1. Check for swing brake not releasing properly.
Refer to Direct Support maintenance.
Step 2. Check for defective swing motor.
Refer to Direct Support maintenance for replacement.
Step 3. Check for internal damage to planetary speed reducer.
Refer to Direct Support maintenance for replacement.
Step 4. Check operation of turntable control valve.
Refer to Direct Support maintenance.
Step 5. Check for defective swing motor thermal relief valve in port N of swing cross-over manifold
block.
Notify Direct Support.
4-63
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