HYDRAULIC IMPACTOR WORKS TOO SLOWLY

TM 5-2420-222-20-1

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

25. HYDRAULIC IMPACTOR DOES NOT WORK - C ONTINUED

Step 3.

Connect hydraulic system test set between impactor valve (1) and backhoe control valve (2) or

manifold (3). Have assistant start engine and run at high idle (TM 5-2420-222-10). While assistant

operates hydraulic impactor valve actuating pedal (4), note reading on hydraulic system test set

pressure gage. Pressure gage should read 1700 to 1800 psi (11,645 to 12,411 kPa). Shut down

engine (TM 5-2420-222-10). Disconnect hydraulic system test set.

a. If pressure gage reads 1700 to 1800 psi (11,645 to 12,411 kPa), install hydraulic impactor flow

regulator (page 2-1237) and replace hydraulic impactor and motor assembly (page 2-1893).

b. If pressure gage reads less than 1700 psi (11,645 kPa), replace hydraulic impactor valve (page

2-1228).

26. HYDRAULIC IMPACTOR WORKS TOO SLOWLY

Step 1.

Check hydraulic impactor flow control pedal rod (5) and link (6) for abnormal bends and binding.

a. If rod (5) or link (6) are bent or binding replace as outlined in Hydraulic Impactor Valve (page 2-

1228).

b. If rod (5) and link (6) are not bent or binding, go to step 2.

Step 2.

Operate hydraulic impactor (TM 5-2420-222-10) and check for fluid leaks.

a. If hydraulic impactor has fluid leak, replace hydraulic impactor and motor assembly (page 2-

1893).

b. If hydraulic impactor does not have fluid leak, got to step 3.

Step 3.

Lubricate hydraulic Impactor (LO 5-2420-222-12).

a. Lubricating hydraulic impactor corrects problem.

b. If lubricating hydraulic impactor does not correct problem, go to Hydraulic System Malfunction

25: Hydraulic Impactor Does Not Work (page 2-132).

2-134