Hitachi ZW180 Technical Manual page 94

Ride Control (Optional)
Purpose: To reduce fatigue of the operator by orga-
nizing a damper circuit in the lift arm cylinder
and reducing shock when traveling on rough
roads
Operation:
1. When the ride control switch is turned ON, MC
makes the ride control effective and the ride con-
trol indicator on the monitor is lit.
2. At vehicle speed of 7 km/h (4 mph) and above,
MC receives the signal from the vehicle speed
sensor and transmits current to the ride control
solenoid valve.
3. When the ride control solenoid valve is operated
and the spool moves, a damper circuit is organ-
ized between the rod side and the bottom side of
the lift arm cylinder. When the vehicle body travels
on rough roads, the fluctuation of the bottom
pressure of the lift arm cylinder is absorbed by the
ride control accumulator and the shock of the
whole vehicle body is reduced.
NOTE: The ride control is not made at the vehicle
speed of 7 km/h (4 mph) and below.
NOTE: In case the ride control switch or the ride
control solenoid valve becomes out of order,
the ride control is not made.
SYSTEM / Control System
T2-1-52