BACKHOE CROWD CYLINDER DOES NOT WORK

TM 5-2420-222-20-1

ORGANIZATIONAL TROUBLESHOOTING - CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

17. BACKHOE BUCKET CYLINDER DOES NOT WORK - CONTINUED

WARNING

Keep clear of area between main frame and backhoe boom, and other backhoe components, when backhoe

control levers are being operated. There is no clearance for personnel when boom is swung full-left or full-right.

Step 2.

Connect hydraulic system test set in backhoe control valve-to-manifold block oil line (1 or 2)

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 bucket cylinder (page 2-1726).

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

backhoe control valve (page 2-1260).

18. BACKHOE CROWD CYLINDER DOES NOT WORK

Step 1.

Check backhoe control valve-to-backhoe crowd cylinder oil lines (6 thru 9) for sharp bends, dents,

or kinks.

a. If backhoe control valve-to-backhoe crowd cylinder oil lines (6 thru 9) are not bent, dented, or

kinked, go to step 2.

b. If manifold block-to-crowd cylinder oil line (6 or 7) has a sharp bend, dent, or kink, replace (Serial

Numbers 235786 thru 235999 only, page 2-1580; Serial Numbers 319995 thru 342573 only,

page 2-1578).

c. If backhoe control valve-to-manifold block oil line (8 or 9) has sharp bend, dent, or kink, replace

(page 2-1558).

WARNING

Keep clear of area between main frame and backhoe boom, and other backhoe components, when backhoe

control levers are being operated. There is no clearance for personnel when boom is swung full-left or full-right.

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