3-27
Controls and Operating
BODY CONTROL
The lever to the left of the operator’s seat controls the hydraulic valve which
operates the body hoist cylinders. The four operating positions of the lever from
front to rear are as follows:
'LOWER' - This position provides hydraulic force to power-down the body. It is
needed when the body cannot be started downward from the fully raised position
by gravity. When the body starts lowering by gravity, the lever should be moved
to the 'FLOAT' position.
'FLOAT' - The lever should be moved to this position while the body is lowering
by gravity and should remain in this position until the body must be operated
again. The control lever should always be kept in 'FLOAT' while the machine is in
motion.
'HOLD' - Moving the lever to this position while the body is being raised or
lowered traps the oil in the body hoist cylinders to stop and hold the body at any
desired height. The lever will remain in the detented 'HOLD' position when
released.
'RAISE' - This position directs oil to extend the body hoist cylinders and raise
the body. When released, the lever will be spring-returned to the 'HOLD' position.
Pressurized system. Before carrying out any maintenance on the
body control system, pressure must be dissipated from the pilot valve
accumulator. Shut-off the engine and operate the body control lever
in both directions approximately 15 times to discharge the
accumulator.
Raising the Body
Before raising the body, allow the engine to slow to idle, make sure the rear
wheels are on firm level ground, shift the transmission to Neutral and hold the
machine stationary by applying the brakes with the spotting brake control.
Move the body control lever all the way back to the 'RAISE' position and
accelerate the engine. The body can be stopped at any point by moving the lever
to 'HOLD'. Decelerate the engine as the last stages of the body hoists begin to
extend to slow the raising speed as the body hoists cylinder approach their
maximum extensions.
When the body has been raised to the desired height, move the control lever to
the 'HOLD' position until the body is to be lowered.
Lowering the Body
To lower the body, move the control lever to the 'FLOAT' position to allow the
body's weight to lower it to the frame. Body descent can be stopped at any
position by moving the lever back to the 'HOLD' position. If the body does not
begin to lower by its own weight, such as after dumping downgrade, move the
control lever all the way forward to the 'LOWER' position and power the body
downward until it begins lowering by gravity. Then move the lever to 'FLOAT' to
allow the body to lower the rest of the way to the chassis.
Make sure that the body is completely lowered and the control lever is in 'FLOAT'
before releasing the brakes and moving the machine.
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