Table 4-2. Unit Troubleshooting-continued -706880195

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

Table 4-2. Unit Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

HYDRAULIC SYSTEM - Continued

SLOW OR ERRATIC OPERATION OF OUTRIGGER EXTENSION CYLINDERS

Step 1. Check for air in system.

Purge system by extending and retracting, raising and lowering the outrigger to its full travel

limits several times.

Step 2. Check for low hydraulic oil.

Fill oil to proper level (see para 3-1).

Step 3. Check for malfunctioning outrigger control valve.

Refer to Direct Support maintenance to replace control valve.

Step 4. Check for defective outrigger extension cylinder (internal parts).

Refer to Direct Support maintenance to repair outrigger extension cylinder.

Step 5. Check for defective main hydraulic pump.

Refer to Direct Support maintenance to repair pump.

OUTRIGGER EXTENDS WHILE MACHINE IS ROADING

Step 1. Check for air in extension cylinder.

Purge system by extending and retracting, raising and lowering the outrigger several times

to its full travel limits.

Step 2. Check for leaking piston seals or internal damage in outrigger extension cylinders.

Refer to Direct Support maintenance to replace seals.

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