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Page Title:
BOOM DOES NOT LOWER OR LOWERS SLOWLY. |
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 TM 9-2320-364-34-1
2-15. MATERIAL HANDLING CRANE TROUBLESHOOTING (CONT).
15. BOOM DOES NOT LOWER OR LOWERS SLOWLY.
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)
Preformed Packing (4) (Item 389, Appendix E)
Pressure Test Kit (Item 165, Appendix F)
Wooden Block (Appendix C)
Lifting Device (Minimum Capacity
Wooden Block (Appendix C)
2500 lbs/1135 kg)
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
References
Parking brake applied, (TM 9-2320-364-10)
TM 9-2320-364-10
Wheels chocked, (TM 9-2320-364-10)
TM 9-2320-364-20
Outriggers down with weight off
vehicle suspension, (TM 9-2320-364-10)
START
1.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting
Flowmeter test.
on Page 2-605
tasks completed.
Boom raises.
REASON FOR QUESTION
Are 4 gpm (15 lpm) or more
POSSIBLE PROBLEMS
If BOOM valve on four valve
measured from BOOM valve
bank is faulty, flow to boom lift
Four valve bank faulty.
cylinders will be restricted.
with valve isolated from boom
Lift cylinder faulty.
lift cylinders?
Repair four valve
bank (Para 16-26).
NO
Verify repair, go to
Step 5 of this Fault.
YES
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