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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
2
AERIAL CONTROLS ARE INOPERATIVE
Diverter valve malfunctioning.
Replace diverter valve (see para 4-193).
3
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).
4
ALL LADDER OPERATIONS ERRATIC OR SLOW
Refer to hydraulic system component testing (see para 5-50) to test pressure reducing (de-stroking)
valve.
5
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).
6
LADDER WILL NOT LOWER
Ladder control valve has failed (raise or lower).
Replace ladder control valve (see para 5-56).
7
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).
5-24
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