Table 4-2. Unit Troubleshooting-continued -706880193

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

Table 4-2 Unit Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

HYDRAULIC SYSTEM - Continued

SWING OPERATION ERRATIC IN EITHER DIRECTION

Step 1. Check hydraulic oil level.

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

Step 2. Check for defective gear or bearing in planetary speed reducer.

Refer to Direct Support maintenance.

Step 3. Check for insufficient turntable bearing lubrication.

Lubricate bearing (see para 3-1. ).

Step 4. Check for excessive overload on LADDER LOAD gauge.

Reduce load.

Step 5. Check for proper operation of swing motor.

Refer to Direct Support maintenance for replacement.

Step 6. Check for restricted or partly clogged hydraulic hoses or fittings.

Remove the hoses from the swing cross-over manifold block to the hydraulic motor and

inspect fittings and hoses for foreign objects or restrictions.

SWING OPERATION SLOW IN EITHER DIRECTION

Step 1. Check that swing brake is releasing.

Refer to Direct Support maintenance.

Step 2. Check for clogged or restricted hydraulic hoses or fittings.

Remove and inspect hoses and fittings from the diverter valve to the swing brake.

Step 3. Check for defective swing motor.

Refer to Direct Support maintenance.

Step 4. Check for defective swing motor relief valves.

Replace swing cross-over relief manifold relief cartridges in ports "N'", "O" or "R".

4-64