Pothole Protector Interlock
Perform this test using the lower controls.
1. Stow the aerial platform on a smooth, flat, level con-
crete slab.
2. Remove all persons and materials from the plat-
form.
3. With the trays closed, check the ground clearance
under the pothole protector skids (refer to Figure
8.12). Clearance should be at least 2
3
/
4
″
(7 cm) on
both sides of the aerial platform.
Figure 8.12—Pothole Protector Skid
4. Raise the platform while watching movement of the
skids. The skids should lower to less than
3
/
4
″
(2 cm)
ground clearance when the platform is raised ap-
proximately 24
″
(61 cm).
5. Fully lower the platform while watching movement
of the skids. The skids should raise to their original
position when the platform is lowered to approxi-
mately 24
″
(61 cm).
6. Place a 1
1
/
2
″
(3.8 cm) thick board, such as a 2 x 4, un-
der the skid on the left side (refer to Figure 8.13).
Figure 8.13—Pothole Protector Interlock Test
7. The board will prevent the skid from lowering fully.
Raise the platform while watching the skid. When
the skid contacts the board, the platform should
stop raising and an alarm should sound at less than
seven feet platform floor height. The alarm should
then sound when the platform lift switch is acti-
vated. The platform should not raise any farther.
8. Lower the platform. Place the board under the skid
on the right side.
9. Raise the platform while watching the skid. When
the skid contacts the board, the platform should
stop raising and an alarm should sound at less than
seven feet platform floor height. The alarm should
then sound when the platform raise switch is acti-
vated. The platform should not raise any farther.
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury can result from such accidents. Do not alter,
disable, or override any safety device.
10. If the platform raise function is not disabled, or the
alarm does not sound remove the aerial platform
from service until the problem is corrected.
Level Sensor Interlock
Perform this test after verifying proper operation of the
pothole protector interlock.
1. Position the aerial platform on a smooth, flat, level
surface.
2. Remove all persons and materials from the plat-
form.
3. From the lower controls, raise the platform to ac-
cess the level sensor at the rear of the chassis (refer
to Figure 8.14).
Figure 8.14—Left Rear of Chassis
4. Pull the level sensor to the side as far as possible
while raising the platform. The platform should stop
raising and the alarm should sound at less than 7
′
(2 m) of platform elevation.
S1930 – 0361266
8 - 5
Chapter 8. Prestart Inspection
A
DANGER
Pothole Protector Skid
Level Sensor Access
Level Sensor
