Gradall 534B (9103-1390) Service Manual - Manual (Page 48)

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. This is in 1st and 2nd
gear only.
The transmission steering 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.
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 2500 psi steering relief valve. As the
steering wheel is turned, oil is routed to ends of the
two rear steering cylinders. 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 circuits not being used, all the fluid
from the pump section is routed to the Fwd/Rev
Valve.
STEERING CIRCUIT
7