IMPACT WRENCH-continued

TM 5-2420-224-34

Table 2-1. Troubleshooting (Cont)

Malfunction

Test or inspection

Corrective Action

IMPACT WRENCH (CONT)

28. IMPACT WRENCH WILL NOT OPERATE.

Step 1. Check for sticking or broken trigger controls.

Repair

impact

wrench

Perform Malfunction 20.

Step 2.

BR67 PAVEMENT BREAKER

29. PAVEMENT BREAKER WILL NOT OPERATE OR OPERATES SLOWLY.

Step 1. Check for low accumulator charge (pressure hose will pulse more than normal).

Charge

accumulator

If charge loss continues, repair pavement breaker (page 21-24).

Perform Malfunction 20.

Step 2.

CHAIN SAW

30. CHAIN SAW WILL NOT OPERATE.

Perform Malfunction 20.

BACKHOE

31. ALL BACKHOE FUNCTIONS SLUGGISH.

Step 1. Perform Malfunction 20.

Step 2. Check for incorrect pressure setting for safety relief valves as follows:

Cycle circuit(s) to be tested until oil is at operating temperature of 120F (49C).

Place backhoe in three-point stance.

Shut off engine.

Relieve hydraulic pressure by moving controls back and forth.

Disconnect hydraulic hose from port to be tested.

Connect hand pump to port to be tested.

S t r o k e hand pump until sufficient pressure is built up in circuit to open

safety relief valve.

Continue to stroke hand pump until ail airhas been pumped out of lines.