TM 9-2320-366-34-1
2-1101
FOUR WAY CONTROL VALVE ASSEMBLY FLOW TEST
NOTE
Test in worst direction (tele in or tele out).
To select tele in: substitute port B for
port A, in steps (1), (2), (12) and (13); in
step (6) operate tele in and in step (7)
observe reading of about 4 gpm
(15.2 lpm).
(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).
(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
telescoping 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 telecsope out (TM
9-2320-366-10-1).
(9) Observe reading of about 8 gpm (30 lpm).
If flow is low, replace boom telescope control
valve in four way control valve assembly.
If boom will only work in tele in position,
perform visual inspection of telescopic
out lockout valve. Replace damaged
telescopic out lockout valve. If necessary,
perform electrical troubleshooting
(e115. M1084/M1086 MHC Overload
Shutdown System Stays Activated).
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.
