Emergency Steering Pump (Optional) - Hitachi ZW180 Technical Manual

EMERGENCY STEERING PUMP
(OPTIONAL)
The emergency steering pump is available in case
supply of pressure oil from the main pump is suddenly
stopped, and delivers pressure oil to the steering valve
in place of the main pump until the vehicle body is
moved to a safe place.
COMPONENT OPERATION / Others
Electric Motor Part
Check Valve
The emergency steering pump consists of the gear
pump, the electric motor, the relief valve and the check
valve.
T3-12-4
Gear Pump Part
Relief Valve
T4GB-03-12-008