FRONT LOADER

TM 5-2420-224-34

Table 2-1. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

CRANE (CONT)

NOTE

Monitor oil temperature during entire test. Do not allow oil temperature to exceed 140F

(60C). Failure to do so may result in incorrect readings of flow rate.

Cycle oil until oil is at operating temperature of 120F (49C).

g. Close load valve until 1000 psi (69 bar) is noted on flow meter.

h. Open load valve until 0 psi (0 bar) is noted on flow meter.

Close load valve until 1500 psi (103.4 bar) is noted on flow meter.

Open load valve until 0 psi (0 bar) is noted on flow meter.

k. Close load valve until 2000 psi (137.9 bar) is noted on flow meter. Flow

rate at this time should be 9 gpm (34 Ipm).

If flow rate is not 9 gpm (34 Ipm), replace flow regulating

38. CRANE OPERATION SLOWS DOWN.

Perform Malfunction 37, step 3.

39. CRANE OPERATION UNUSUALLY NOISY, YIELDS OR DRIFTS.

Check holding valve on noisy cylinder as follows:

Lift maximum load for crane approximately 6-8 in. off ground.

b. Extend outer boom to its maximum.

Shut off engine.

d. Monitor down drift of load for approximately 10 minutes.

If there is any down drift of load, replace holding valve on

cylinder that drifts down.

FRONT LOADER

40. CONTROL VALVE WILL NOT HOLD IN FLOAT POSITION.

Check for worn or damaged parts in mechanical detent. If parts are worn or

damaged, adjust float detent as follows: