TM 9-2510-247-13&P
0028 00
UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HYDRAULIC SYSTEM - Continued
7. MAST 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 boom, extension, 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 MAST RETRACT gradually.
If oil returns from cylinder, but there is no movement of mast 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 MAST RETRACT lever, put
end of removed hose in drain pan and gradually operate MAST 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 MAST 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 mast operate using the remote control?
If no, replace remote control.
If yes, return to step 3.
END OF WORK PACKAGE
0028 00-4
