TM 9-2320-366-34-1
KNOWN INFO
POSSIBLE PROBLEMS
1.
YES
Is flow through boom lift
control valve OK?
START
NO
TEST OPTIONS
REASON FOR QUESTION
Four Way Control Valve
Assembly Flow Test
Repair four way control valve assembly (para 16-28).
WARNING
Read WARNING
on following page.
INITIAL SETUP
Equipment Conditions
Engine shut down (TM 9-2320-366-10-1).
Personnel Required
(2)
Tools and Special Tools
Tool Kit, Genl Mech (Item 78, Appendix B)
Tester, Hydraulic (Item 73, Appendix B)
Pan, Drain (Item 43, Appendix B)
Goggles, Industrial (Item 28, Appendix B)
l9. M1084/M1086 MATERIAL HANDLING CRANE (MHC) BOOM DOES NOT
LIFT UP OR DOWN OR HOLD UNDER LOAD
Hydraulic oil level OK.
Hydraulic hoses, tubes,
and fittings OK.
Faulty four way control
valve.
Faulty boom-up lockout
valve.
Faulty boom-down lockout
valve.
Faulty holding relief valve.
Faulty lift cylinder(s).
Faulty boom lift lockout or
four way control valve will
cause boom to not lift up
or down.
Materials/Parts
Rag, Wiping (Item 60, Appendix C)
Hose (2) (Item 40, Appendix C)
Fitting (2) (Item 31, Appendix C)
Reducer, Tube (Item 61, Appendix C)
Adapter, Swivel (Item 3, Appendix C)
Adapter, Pipe (Item 2, Appendix C)
2-1106
