OUTRIGGER
JACK
EXTEND
LH O/R JACK
CONTROL
LEVER
TM 9-4940-568-34
2-40
Table 2-7. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. LEFT OUTRIGGER JACK CYLINDER DOES NOT RAISE OR LOWER (Continued).
Test 1.
Disconnect the line that comes from the outrigger jack cylinder extend fitting at left jack
control valve of three valve bank assembly. Install a flow meter in line between control
valve and line. Open pressure control valve fully by turning control knob counter clockwise
to DECREASE. Start FRS. Have assistant operate LH O/R JACK control lever to attempt
to extend outrigger jack cylinder. Slowly close pressure control valve by turning knob
clockwise to INCREASE. Create 3,000 - 3,200 psi (20,684 to 22,063 kPa) working
pressure.
If pressure is within specifications, repair or replace outrigger jack cylinder. Refer
to paragraph 3-9 or 6-2.
If pressure is not within specifications, go to Test 2.
