Dumpers with hydraulically
rotated skips
The tank, filter, pump and steering circuit
operate in basically the same manner as
for the conventional forward tipping skip.
(see the previous and following pages),
with the addition of a load sensing steer
valve and a separate flow priority valve.
Skip rotation
The skip is operated by a four-way
joystick control valve.
Joystick control valve: The control
valve (7) receives oil from the pump and
delivers it to either the tipping rams (8), or
the swivel rams (9). The rate of oil flow to
the rams is proportional to the distance
that the joystick lever is moved.
If the lever is held in one of its most
extreme positions (either left/right or
forwards/backwards, after any of the rams
have reached their full stroke, a relief
valve opens, allowing the oil to return to
the tank.
Because the joystick is fitted with a gate it
is not possible to move the lever
diagonally, therefore it is not possible to
tip and swivel simultaneously.
SERVICE 3.14A
HYDRAULIC SYSTEM
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