Table 4-2. Unit Troubleshooting-continued -706880197

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

Table 4-2. Unit Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

HYDRAULIC SYSTEM - Continued

FOAMING HYDRAULIC OIL

Step 1. Check hydraulic oil level.

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

Step 2. Check for broken or loose supply line.

Tighten or replace line (see para 4-9).

Step 3. Check for water in hydraulic system as indicated by white or milky hydraulic oil.

Drain, flush, and refill system (see para 3-1).

Step 4. Check for Incorrect type of oil in system.

Drain and refill system (see para 3-1).

CLOUDY HYDRAULIC OIL

Excessive moisture in system.

Drain, flush, and refill system (see para 3-1).

OVERHEATING HYDRAULIC OIL

Step 1. Check hydraulic oil level.

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

Step 2. Check for contaminated hydraulic oil.

Determine/correct cause of contamination; drain, flush and refill system (see para 3-1).

Step 3. Check for defective pressure reducing (de-stroking) valve.

Replace pressure reducing valve (see para 4-191).

EXCESSIVE PRESSURE BUILD-UP

Check for defective pump pressure compensating valve in main hydraulic pump.

Refer to Direct Support maintenance.

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