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Page Title:
MAST DOES NOT OPERATE OR OPERATES SLOWLY. |
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 TM 9-2320-364-34-1
2-15. MATERIAL HANDLING CRANE TROUBLESHOOTING (CONT).
5. MAST DOES NOT OPERATE OR OPERATES SLOWLY.
INITIAL SETUP
Tools and Special Tools
Personnel Required
Tool Kit, General Mechanic's
Two
(Item 240, Appendix F)
References
Cap and Plug Set (Item 26, Appendix F)
TM 9-2320-364-10
Pan, Drain 4 gal (Item 144, Appendix F)
TM 9-2320-364-20
Pressure Test Kit (Item 165, Appendix F)
Equipment Condition
Materials/Parts
Engine OFF, (TM 9-2320-364-10)
Oil, Hydraulics (Item 34, Appendix B)
Parking brake applied, (TM 9-2320-364-10)
Tags, Identification (Item 72, Appendix B)
Wheels chocked, (TM 9-2320-364-10)
Preformed Packing (2) (Item 336, Appendix E)
Outriggers down with weight off
Preformed Packing (5) (Item 337, Appendix E)
vehicle suspension, (TM 9-2320-364-10)
Preformed Packing (3) (Item 389, Appendix E)
START
1.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
Unit Troubleshooting
Flow/pressure test.
on Page 2-483
tasks completed.
Outriggers operate.
REASON FOR QUESTION
Are 6 gpm (23 lpm) or more
If MAST valve on three valve
POSSIBLE PROBLEMS
measured from MAST valve
bank is faulty, pressure and flow
to lift cylinder will be restricted.
with valve isolated from lift
Three valve bank faulty.
cylinder?
Erection cylinder faulty.
Orifice faulty.
Tension link faulty.
Repair three valve
bank (Para 16-27).
NO
Verify repair, go to
Step 10 of this Fault.
YES
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