Table 5-2. Direct Support Troubleshooting-continued -706880694

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

Table 5-2. Direct Support Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

HYDRAULIC SYSTEM - Continued

AERIAL CONTROLS ARE INOPERATIVE

Diverter valve malfunctioning.

Replace diverter valve (see para 4-193).

LADDER RAISES OR EXTENDS SLOWLY OR ERRATICALLY

Cylinder piston seals leaking.

Remove hoist and/or extension cylinders and replace piston seals, (see para 6-70 and 6-77).

ALL LADDER OPERATIONS ERRATIC OR SLOW

Refer to hydraulic system component testing (see para 5-50) to test pressure reducing (de-stroking)

valve.

LADDER DOES NOT OPERATE

Step 1. Diverter valve has not shifted to aerial position.

Replace diverter valve (see para 4-193).

Step 2. Ladder control valve malfunctioning.

Replace control valve (see para 5-56).

LADDER WILL NOT LOWER

Ladder control valve has failed (raise or lower).

Replace ladder control valve (see para 5-56).

NO SWING OPERATION IN EITHER DIRECTION

Step 1. Swing brake not releasing properly.

Replace or repair as necessary (see para 5-54 and 6-73).

Step 2. Worn or defective swing motor.

Replace or repair as necessary (see para 5-62 and 6-76).

Step 3. Internal damage to planetary speed reducer.

Repair or replace as necessary (see para 5-53 or 6-72).

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