TM 9-2510-247-13&P
0028 00
UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HYDRAULIC SYSTEM - Continued
6. BOOM WILL NOT OPERATE
Step 1.
Is hydraulic pressure gauge showing pressure?
If no, adjust hydraulic flow valves (WP 0003).
If yes, go to step 2.
Step 2.
Are hydraulic motors running?
If no, check batteries for voltage. Check IVEC cable connection from prime
mover. Check for voltage at solenoids.
If yes, go to step 3.
Step 3.
Will mast, extensions, and winch functions operate using the valve control levers?
If no, remove hose from hydraulic lock valve to base end of boom hydraulic
cylinder. Hold oil drain pail under open port in hydraulic cylinder. Operate control
lever BOOM RETRACT gradually.
If oil returns from cylinder, but there is no movement of booms or cylinder, the
cylinder packing is allowing oil to bypass and the hydraulic cylinder must be
replaced.
If oil does not return from cylinder when operating boom retract lever, put end of
removed hose in drain pan and gradually operate BOOM EXTEND control lever.
If oil does not flow out of hose, remove hose between control valve and lock
valve. Re-attach swivel end at control valve and put other end of hose in drain
pan. Operate BOOM EXTEND control lever.
If oil does not flow out of hose, replace control valve.
If oil does flow out of hose, replace lock valve.
If yes, go to step 4.
Step 4.
Will boom operate using the remote control?
If no, replace remote control.
If yes, return to step 3.
0028 00-3
