Table 4-2. Unit Troubleshooting-continued -706880196

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

Table 4-2. Unit Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

HYDRAULIC SYSTEM - Continued

OUTRIGGER JACK CYLINDER SLOW OR ERRATIC

Step 1. Check for air in system.

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

to its full travel limits.

Step 2. Check for defective jack cylinder check valves.

Replace check valves (see para 4-195).

Step 3. Jack cylinder piston seals worn or internal damage.

Refer to Direct Support maintenance to replace jack cylinder piston seals.

OUTRIGGER JACK CYLINDER RETRACTS UNDER LOAD

Step 1. Check for air in system.

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

limits several times.

Step 2. Check for defective jack cylinder check valves.

Replace jack cylinder check valve (see para 4-195).

Step 3. Check for leaking piston seals or internal damage in jack cylinders.

Refer to Direct Support maintenance to replace piston seals.

PUMP NOISE DUE TO CAVITATION

Step 1. Check hydraulic oil level.

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

Step 2. Check for plugged hydraulic return line filter.

Replace filter (see para 4-189).

Step 3. Check for air leakage in hydraulic suction lines with shaving cream.

Tighten or remake leaking connections (see para 4-9).

4-67