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TM 5-4210-233-14&P-1
Table 5-2. Direct Support Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HYDRAULIC SYSTEM - Continued
7
NO SWING OPERATION IN EITHER DIRECTION - Continued
Step 1. Defective turntable control valve.
Replace turntable control valve (see para 5-56).
Step 2. Defective swing motor thermal relief valve.
Replace swing motor thermal relief valve in port N of swing cross-over manifold block
(see para 6-74).
8
SWING OPERATION ERRATIC IN EITHER DIRECTION
Step 1. Defective gear or bearing in planetary speed reducer.
Repair or replace planetary speed reducer as necessary (see para 5-53 or 6-72).
Step 2. Defective swing motor.
Repair or replace swing motor as necessary (see para 5-62 and 6-76).
9
SWING OPERATION SLOW IN EITHER DIRECTION
Step 1. Swing brake not releasing.
Repair as necessary (see para 5-54 and 6-73).
Step 2. Worn or defective swing motor.
Repair or replace swing motor as necessary (see para 5-62 or 6-76).
10
ERRATIC OPERATION IN ALL HYDRAULIC CIRCUITS
Step 1. Pressure reducing (de-stroking) valve defective.
Refer to hydraulic system component testing (see para 5-50) before replacing valve.
Step 2. Worn or defective hydraulic pump.
Refer to hydraulic system component testing (see para 5-50.) and repair or replace as
necessary (see para 5-61 or 6-75).
5-25
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