TM 9-2320-366-34-1
FOUR WAY CONTROL VALVE ASSEMBLY FLOW TEST
NOTE
Test in worst direction (boom
up or boom down). To select
boom down: substitute port B
for port A, in steps (2), (3), (14)
and (15), and operate boom
down, in step (8).
(13) Shut down engine (TM 9-2320-336-10-1).
(14) Disconnect hydraulic tester, hoses and
adapters from port A and hose.
(15) Connect hose to port A.
(16) Remove drain pan from under vehicle.
(1) Place drain pan under vehicle.
(2) Disconnect hose from port A of boom lift
control valve in four way (upper) control
valve assembly.
(3) Connect hydraulic tester between hose
and port A with test hoses and adapters.
(4) Start engine (TM 9-2320-366-10-1).
(5) Position PTO switch to on (TM
9-2320-366-10-1).
(6) Increase engine RPM to 1250-1450 RPM (TM
9-2320-366-10-1).
(7) Position MHC power switch to ON (TM
9-2320-366-10-1).
(8) Operate MHC boom up or down (TM
9-2320-366-10-1).
(9) Observe reading of about 3.5 gpm (13 lpm)
boom down or 5 gpm (19 lpm) for boom up
at 2900-3100 psi (19996-21375 kPa). If flow is
low, replace control valve.
(10) Stow MHC (TM 9-2320-366-10-1).
(11) Position MHC power switch to OFF (TM
9-2320-366-10-1).
(12) Position PTO switch to off (TM
9-2320-366-10-1).
WARNING
Wear approved eye protection when performing
pressure checks. Failure to comply may result
in oil getting into eyes. If oil contacts eyes, seek
medical attention immediately.
Drop hydraulic pressure to zero before
disconnecting any hydraulic hose, tube, or fitting.
Failure to comply may result in injury to personnel.
Fuel and oil are slippery and can cause falls.
Wipe up spilled fuel or oil with rags. Failure
to comply may result in injury to personnel.
2-1107
