TM 9-2320-366-34-1
2-1099
FOUR WAY CONTROL VALVE ASSEMBLY FLOW TEST
NOTE
If boom swings right OK but will not
swing left: substitute port B for port
A, in steps (2), (3), (14) and (15), and
operate swing control left, in step (8).
(10) Shut down MHC (TM 9-2320-366-10-1).
(11) Position MHC power to OFF (TM
9-2320-366-10-1).
(12) Position PTO switch to off (TM
9-2320-366-10-1).
(13) Shut down engine (TM 9-2320-366-10-1).
(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 swing
control valve in four way (upper) control valve
assembly.
(3) Connect hydraulic tester kit 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 swing control to the right
(TM 9-2320-366-10-1).
(9) Observe reading of 2-3 gpm (8-11 lpm),
with low pressure.
(a) If flow and pressure are low, replace
control valve (in four way control valve
assembly).
(b) If pressure is high with no flow, replace
cross relief valve. If fault not corrected,
replace hydraulic orbit motor.
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.
