Gradall 534B (9020-7317) Service Manual - Manual (Page 87)

HYDRAULIC CYLINDERS
There are eight hydraulic cylinders: Sway, Lift (2),
Compensating, Tilt, Crowd (Boom In-Out), and
Rear Wheel Steering (2).
On the Tilt, Crowd and Lift Cylinders, a counter-
balance valve is used to protect against broken hoses
and to control lowering actions.
The Sway Cylinder has two piloted check valves to
provide a positive lock of oil in the cylinder. Pressure
applied to the Circuit from the valve in either
direction, unseats the check plunger and allows the
desired two-way flow of oil.
GRADALL LOED MATERIALS HANDLER 534B SYSTEM OPERATION
C h e c k Va l v e s
11
C o u n t e r B a l a n c e Va l v e