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Page Title: FOUR VALVE BANK FUNCTIONS (SWING, LIFT, TELESCOPE AND HOIST) DO NOT OPERATE OR OPERATE SLOWLY.
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TM 9-2320-364-34-1
2-15. MATERIAL HANDLING CRANE TROUBLESHOOTING (CONT).
4. FOUR VALVE BANK FUNCTIONS (SWING, LIFT, TELESCOPE AND HOIST)
DO NOT OPERATE OR OPERATE SLOWLY.
INITIAL SETUP
Tools and Special Tools
References
Tool Kit, General Mechanic's
TM 9-2320-364-10
(Item 240, Appendix F)
Equipment Condition
Materials/Parts
Engine OFF, (TM 9-2320-364-10)
Wire, Nonelectrical (Item 79, Appendix B)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
Outriggers down with weight off
vehicle suspension, (TM 9-2320-364-10)
START
1.
KNOWN INFO
TEST OPTIONS
Can MHC SYSTEM
Unit Troubleshooting
Operation test.
tasks completed.
HYDRAULIC PRESSURE
Outriggers operate.
REASON FOR QUESTION
MANUAL OVERRIDE push
button be pushed in?
If MHC SYSTEM HYDRAULIC
POSSIBLE PROBLEMS
PRESSURE valve is faulty, fluid
going to four valve bank will be
Solenoid valve assembly faulty.
restricted.
Four valve bank faulty.
Repair solenoid valve
assembly
NO
(Para 16-34).
Verify repair, go to
Step 5 of this Fault.
YES

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