TM 9-4940-568-34
2-38
Table 2-7. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. OUTRIGGER BEAM DOES NOT EXTEND OR RETRACT (Continued).
Test 2.
Remove the line that comes from the outrigger beam retract fitting at middle 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 O/R EXT control lever to attempt to retract outrigger beam.
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 beam extend/retract
cylinder. Refer to paragraph 3-8 or 6-2.
If pressure is not within specifications, repair or replace control valve/shuttle valve
circuit. Refer to paragraphs 3-7 or 3-35. If fault is not corrected, repair or replace
outrigger beam extend/retract cylinder. Refer to paragraph 3-8 or 6-2.
