Printed in U.S.A.
3-32
918070/FP0811
Machine Operation
Joystick Controls
Extending and retracting the cylinders (boom, arm and
bucket) are controlled by the joysticks located on the
consoles attached to the operator’s seat. See page 3-17
for control configurations.
Note: The joystick controls are pilot-operated. The far-
ther the controls are moved from center, the faster the
machine will function.
Hydraulic Swivel Unit Brake
Swing frame rotation is sufficiently braked by moving
the control lever back to the initial position. Moving
the control lever in the opposite direction brakes the
swing frame with full hydraulic pressure.
The upper carriage’s rotation is sufficiently braked by
moving the control lever back to the initial position.
Moving the control lever in the opposite direction
brakes the upper carriage with full hydraulic pressure.
Mechanical Stop Brake
A multi-disc brake integrated into the rotation drive has
an additional mechanical brake effect with a time
delay. This brake is used to stop the swivel unit from
rotating in any position.
Operating Precautions
DO NOT
use machine travel or swing to provide addi-
tional breakout force when the bucket is in the ground.
IMPORTANT
Hydraulic swivel unit brake function is not
optimal if the hydraulic system has not
reached operating temperature.
DANGER
•
DO NOT elevate the front end of the
tracks by use of downward pressure on
the dozer blade. This will cause the
machine to become unstable.
•
DO NOT excavate underneath the
machine.
•
Always be sure that there is adequate
support underneath the machine. Be
aware of conditions that could cause
the earth or foundation to collapse,
resulting in risk of injury or death.
•
Do not position the machine directly
underneath structures during demoli-
tion. Falling objects or structure col-
lapse could cause severe damage or
personal injury.
•
Be sure that there is the proper clear-
ance from overhead electrical lines.
•
Be sure that all underground electrical
power and gas supply lines are clearly
marked and avoided.
WARNING
•
DO NOT rest your feet on the travel ped-
als during normal machine operation.
Unexpected machine movement could
occur.
•
On Model 603 machines, make sure there
are no obstacles in the immediate area
before rotating the swing frame because
the rear section of the swing frame pro-
trudes over the undercarriage.
•
When working close to an excavated
edge, be sure that the ground the
machine is sitting on is solid. Keep the
travel motors to the rear. See Figure 3-40.
Summary of Contents for 503Z
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