Gradall 534B (9020-7317) Service Manual - Manual (Page 82)

TRANSMISSION AND
TORQUE CONVERTER
The transmission-torque converter combination has
neutral starting, shifting without stopping, 3 speeds
forward and 3 speeds in reverse.
Gear selection lever is on the right side of the
steering column. The neutral, forward or reverse
lever is on the left side.
When the brake foot pedal is pressed down, either
for braking or inching, the transmission de-clutches
and no power goes to the front axle.
The transmission is fitted with a replaceable oil
filter. The oil cooler assembly is located in the
bottom portion of the engine radiator.
The main tandem pump for the hydraulic system is
mounted to a take-off on the back of the
transmission.
GRADALL LOED MATERIALS HANDLER 534B SYSTEM OPERATION
Oil for the steering is taken from the base pump
section through a priority flow divider valve. Any
movement of the steering wheel actuates the flow
divider plunger and allows up to 10 gpm to be
diverted to the steering orbitrol valve at the base of
the steering post. The priority flow divider valve
also has a 2000 psi steering relief valve, As the
steering wheel is turned, oil is routed to ends of the
two rear steering cylinders.
STEERING CIRCUIT
A one-way check valve is provided between the
priority valve and the orbitrol valve to prevent the
back-up of oil that might cause a kick-back at the
steering wheel.
If the steering circuit is not being used, all the fluidfrom the
pump section is routed to the Fwd / Rev
Valve.
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