Manitowoc Grove RT770E - Description; Outrigger;Rear Steer Valve

2-47
GROVE
RT770E HYDRAULIC SYSTEM
2
Published 11/26/2014, Control # 447-05
OUTRIGGER/REAR STEER VALVE
Description
The outrigger/rear steer valve Figure 2-26 controls the
outrigger circuit and the rear steer circuit. The valve is
mounted on the front face of the carrier frame front cross
member forward of the swivel.
The inlet section contains a 172 bar (2500 psi) relief valve
and a solenoid valve. The solenoid valve is normally open
bypassing oil from the inlet port to the tank port. Activation of
either the outriggers or the rear steer energizes the solenoid
valve to close and allow oil to flow to the selected circuit.
The rear steer section contains a three position four-way
solenoid controlled directional valve.
The outrigger section contains a three position four-way
solenoid controlled directional valve.
Both four-way solenoid valves contain manual override
actuators which allow the valves to be shifted if electrical
power is lost.
FIGURE 2-26
6
2
1
5
5
5
8
1
6
7
4
3
2
7
6
8
3
2
4
7
4
7531-1
7531-2
7531-3
8