Table 5-2. Direct Support Troubleshooting-continued -706880695

TM 5-4210-233-14&P-1

Table 5-2. Direct Support Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

HYDRAULIC SYSTEM - Continued

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).

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).

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).

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