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 TM 9-2320-364-34-1
2-15. MATERIAL HANDLING CRANE TROUBLESHOOTING (CONT).
17. BOOM CREEPS DOWN.
INITIAL SETUP
Tools and Special Tools
Materials/Parts
Tool Kit, General Mechanic's
Oil, Hydraulic (Item 34, Appendix B)
(Item 240, Appendix F)
Tags, Identification (Item 72, Appendix B)
Cap and Plug Set (Item 26, Appendix F)
Lockwasher (4) (Item 282, Appendix E)
Pan, Drain 4 gal (Item 144, Appendix F)
Packing, Preformed (3) (Item 335, Appendix E)
Pressure Test Kit (Item 165, Appendix F)
Packing, Preformed (7) (Item 336, Appendix E)
Wrench, Torque (0-175 lb-ft) (Item 277, Appendix F)
Packing, Preformed (4) (Item 389, Appendix E)
Lifting Device (Minimum Capacity
2500 lbs/1135 kg)
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
References
Wheels chocked, (TM 9-2320-364-10)
TM 9-2320-364-10
Outriggers down with weight off
TM 9-2320-364-20
vehicle suspension, (TM 9-2320-364-10)
START
1.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting
Visual inspection.
on Page 2-629
tasks completed.
Does
Boom operates.
REASON FOR QUESTION
hydraulic fluid
POSSIBLE PROBLEMS
leak from either boom lift
If holding valve in boom lift cyl-
cylinder with boom up and
inder is faulty, fluid will leak
Holding valve faulty.
from piston side of cylinder.
raise pressure hose between
Lift cylinder piston seals
them disconnected at
faulty.
cylinder?
Go to Step 2 of this
NO
Fault.
YES
Replace leaking hold-
ing valve (Para 16-7).
Verify repair, go to
Step 4 of this Fault.
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