FOLDING STAIRWAY
Caterpillar 785D Haul Truck
Section 4. Operating Procedure
Pg7
PSA-CAT785-FS 25-7-13B
To Lower Stairway (from the machine)
Position machine in a level, safe area, away from the work face, whenever possible.
Apply park brake and lower engine speed to idle.
Check that the area below the Stair Access System is clear of people and
obstacles, and lower Stair by operating the two position electrical switch adjacent
to the stair, to the down position by pressing the switch down.
Hold the switch in the down position until Stair is fully lowered.
If the truck is parked on uneven ground, the bottom of the stairway may touch the
ground before the ladder is in the fully lowered position.
Should this occur, descend the Stair with caution.
To Raise Stairway
Ascend the Stair onto the landing of the truck.
Ensure the area around the Stair is clear of people and standing to the side, clear
of the area the handrails and Stair raises into, operate the electrical switch to the
raise position (up).
Hold the switch in the up position until the Stair is in the fully raised position.
The Stair is now raised and stored.
OPERATING NOTES
NOTE: FLOW CONTROL VALVE ADJUSTMENT:
The valve should be positioned to restrict the flow and speed of the Power Step when
lowering. Adjust the knob on top of the valve by turning left or right (clockwise) when the
step is being lowered, until it is lowering at a safe and reasonable speed.
When it is adjusted, lock the adjusting knob by tightening the grub screw located on the
side of the knob.
NOTE: MAGNETIC 'GO' SWITCH ADJUSTMENT:
The switch target trigger area is located on the opposite side and end from the cable entry
point on the switch. Once it is mounted to the switch bracket, adjust the switch in or out
from the stair steel trigger point, to be within 3mm - 10mm from touching each other when
the stair is in the desired rest position.
[DO NOT EXCEED 10mm DISTANCE BETWEEN THE SWITCH AND STRIKER PLATE].
Test by raising and lowering the Power Step a couple of times and adjust again if
necessary.
