Grove Published 11-10-2014, Control # 524-00 2-47
RT880E SERVICE MANUAL HYDRAULIC SYSTEM
HYDRAULIC REMOTE CONTROL VALVE
Description
Single Axis Controller
The crane has four single axis hydraulic remote control
valves Figure 2-23. Each crane function has a control lever
for the operator’s use.
The four hydraulic remote control valves are single function
type valves. Moving the control lever forward or back
operates the selected function. Two valves are located in
each armrest. The valves in the right armrest control the
main hoist and boom lift. The valves in the left armrest
control swing and telescope.
If the crane has an optional auxiliary hoist, the auxiliary hoist
function replaces the telescope function on the control lever
on the left armrest. Instead, the telescope function is
controlled by a pedal operated single function control valve.
The pedal is on the cab floor (Figure 2-25). The control valve
is mounted on the left rear underside of the cab and is
connected to the pedal by linkage.
When the armrests are up, the crane function switch is off, or
the operator leaves his seat, the controller lockout valve is
de-energized and the functions are disabled.
Dual Axis Controller
The two hydraulic remote control valves (Figure 2-24) are
dual function joystick type valves. One valve is located in
each armrest. The valve in the right armrest controls the
main hoist and boom lift. The valve in the left armrest
controls swing and telescope.
If the crane is equipped with an optional auxiliary hoist, the
auxiliary hoist function replaces the telescope function on the
control lever of the left armrest and the telescope function is
controlled by a pedal operated single function control valve.
The pedal is located on the left side of the cab floor. The
control valve is mounted beneath the cab and is connected
to the pedal by linkage.
Maintenance
Armrest Control Valve Removal
1. Gain access to the base of the control valve by raising
the armrest and removing the plastic cover screwed
onto the bottom of the armrest.
2. Tag and disconnect the hydraulic lines to the control
valve. Cap or plug the lines and ports.
3. Remove the bolts securing the control valve to the
armrest. Remove the control valve.
Armrest Control Valve Installation
1. Place the valve on the armrest. Secure the valve to the
armrest with the attaching bolts.
2. Connect the hydraulic lines to the valve as tagged during
removal.
3. Install the plastic cover on the bottom of the armrest.
Secure it with screws, washers and nuts.
Armrest Control Valve Functional Check
1. Start the engine and run it at normal speed.
2. Move each control lever to operate the function
controlled by the corresponding control valve. Verify
proper operation of the hoist motor, swing motor, lift
cylinder, and telescope cylinder.
3. Check valve and lines for leakage. Make repairs as
needed.
Telescope Pedal Control Valve Removal
1. Disconnect the pedal linkage from the control valve by
removing the pin and cotter pin.
2. Tag and disconnect the hydraulic lines from the control
valve. Cap or plug the lines and ports.
3. Remove the four bolts and washers securing the control
valve to the mounting bracket. Remove the valve.
Telescope Pedal Control Valve Installation
1. Place the valve on the mounting bracket and secure in
place with the bolts and washers.
2. Connect the hydraulic lines to the valve as tagged during
removal.
3. Connect the pedal linkage to the control valve with the
pin and cotter pin.
Telescope Pedal Control Valve Functional Check
1. Start the engine and run it at normal speed.
2. Telescope the boom the whole way out and then the
whole way back in. Verify proper telescoping.
3. Check valve and lines for leakage. Make repairs as
needed.
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