Hydraulic Remote Control Valve
There are three hydraulic remote control valves
armrest controls the main hoist and boom lift.
utilized in the crane cab. One is a pedal operated
Moving the control lever straight forward or back
dual function valve located under the cab. This valve
operates the main hoist function. Pushing the
is used for control of the telescope cylinder or the
control lever to either side operates boom lift.
clamshell/grapple cylinder depending on the position
Positioning the lever in a diagonal direction operates
selected on the TELE/CLAMSHELL selector switch
both functions simultaneously. The valve in the left
on the right armrest.
armrest controls the auxiliary hoist and swing.
Pushing the control lever straight forward or back
The other two hydraulic remote control valves are
controls the auxiliary hoist function. Pushing the
dual-function joystick-type valves. One valve is
control lever to either side operates swing.
located in each armrest. The valve in the right
Positioning the lever diagonally operates both
JOYSTICK CONTROL VALVES.
Ensure battery disconnect switch is in OFF position.
Remove screws (1, Figure 2-8-11), lift top cover (2), and slide bottom cover (3) from arm rest.
Tag and disconnect electrical leads for joystick assembly (6).
Tag and disconnect hydraulic lines from fittings on joystick assembly (6).
Remove screws (4), threaded plates (5), and joystick assembly (6) with mount (10) from top cover (2) of
If necessary, remove locknut (7), washers (8), screws (9), and mount (10) from joystick assembly (6).
If necessary, remove tubes (11) and o-rings (12) from ports A2, B1, B2, and T, elbow (13) from port A1,
and tube (14), o-ring (15), and adapter (16) from port P of joystick assembly (6).
If replacing joystick, remove screws and nuts and retain joystick instruction plate.
If removed, install adapter (16, Figure 2-8-11), tube (14), and new o-ring (15) in port P, elbow (13) in port
A1, and o-rings (12) and tubes (11) in ports A2, B1, B2, and T of joystick assembly (6).