TM-5-3895-372-20

CONCRETE-MOBILE MIXER BODY M919, MODEL 8CM-24/F

TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE MANUAL

AUGUST 1980

TM-5-3895-372-20 - Page 473 of 694

TM 5-3895-372-20

Table 10-1. Hydraulic System Troubleshooting Procedures (Continued).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2.

HYDRAULIC PUMP IS NOISY:

Step 1 Check for clogged filter.

Replace clogged filter (see TM 5-3895-372-10).

Step 2. Check that lines are tight.

Tighten.

Step 3. Rebuild hydraulic pump.

Refer problem to Direct Support Maintenance.

3.

HYDRAULIC PRESSURE IS LOW:

Step 1 Check that tachometer reads 1620-1720 rpm.

Use throttle to adjust engine speed.

Step 2 When oil is hot, check hydraulic bypass valve for heat and leakage.

Clean hydraulic bypass valve para 10-9).

Step 3 Check pressure relief valve adjustment (para 10-10).

a.

Adjust pressure relief valve.

b.

Refer problem to Direct Support Maintenance.

4.

HYDRAULIC MOTOR VIBRATES:

Refer problem to Direct Support Maintenance.

5.

TACHOMETER DOES NOT WORK PROPERLY:

Step 1 Be sure setscrews at cable ends are tight.

Tighten setscrews.

Step 2 Check hydraulic pump belts. Deflection should be 5/32 in. (4.0 mm) under 6 lb

(27 N-m) pressure.

Adjust pump belts (para 4-17).

10-3