TM 9-2320-366-34-1
KNOWN INFO
2.
Does boom maintain
position under load?
REASON FOR QUESTION
TEST OPTIONS
NO
YES
Holding Valve Check
Hydraulic oil level OK.
Hydraulic hoses, tubes
and fittings OK.
Hydraulic pump OK.
Monoblock valve OK.
Boom up lockout OK.
Boom down lockout OK.
Overload shutdown
system OK.
Control valve OK.
POSSIBLE PROBLEMS
Faulty holding relief valve.
Faulty boom lift cylinder(s).
Replace lift cylinder(s)
(para 16-37).
Fault corrected.
Faulty holding valve will
cause lift cylinder to drift
down.
j6. M1089 MATERIAL HANDLING CRANE (MHC) BOOM DOES NOT LIFT UP OR DOWN (CONT)
(2-1053 Blank)/2-1054