TM 9-2320-366-34-1
REASON FOR QUESTION
TEST OPTIONS
KNOWN INFO
2.
3.
YES
Does boom maintain
position under load?
NO
TEST OPTIONS
KNOWN INFO
YES
NO
Fault corrected.
Holding Valve Check
Faulty holding relief valve.
Faulty lift cylinder(s).
Replace lift cylinder(s) (para 16-7).
Faulty lift cylinder(s).
Do lift cylinders
work without leaking?
Replace lift cylinder(s) (para 16-7).
Lift Cylinders Load Test
REASON FOR QUESTION
Faulty boom lift cylinder(s)
will cause boom to not
raise and lower properly.
POSSIBLE PROBLEMS
POSSIBLE PROBLEMS
Faulty holding valve will
cause lift cylinder to drift
down.
Hydraulic oil level OK.
Hydraulic hoses, tubes,
and fittings OK.
Boom up and boom down
lockout valves OK.
Four way control valve OK.
Hydraulic oil level OK.
Hydraulic hoses, tubes,
and fittings OK.
Boom up and boom down
lockout valves OK.
Four way control valve OK.
Holding relief valve OK.
l9. M1084/M1086 MATERIAL HANDLING CRANE (MHC) BOOM DOES NOT LIFT UP OR DOWN OR HOLD
UNDER LOAD (CONT)
2-1108
