BACKHOE CROWD CYLINDER DOES NOT WORK (cont)

TM 5-2420-222-20-1

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 2.

Connect hydraulic system test set in backhoe control valve-to-manifold block oil line (8 or 9)

between backhoe control valve (3) and manifold block (4). Have assistant start and run engine at

1,250 rpm (TM 5-2420-222-10). While assistant operates backhoe bucket and dipperstick control

lever (5), note reading on hydraulic system test set. Pressure gage reading should be 1700 to 1800

psi (11,645 to 12,411 kPa). Shut down engine (TM 5-2420-222-10) and disconnect hydraulic system

test set.

a. If hydraulic system test set pressure gage reads 1700 to 1800 psi (11,645 thru 12,411 kPa),

replace backhoe crowd cylinder (page 2-1740).

b. If hydraulic system test set pressure gage reads less than 1700 psi (11,645 kPa), replace

backhoe control valve (page 2-1260).

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