Chapter 11. Emergency Operation
If the aerial platform cannot be operated due to a loss of
hydraulic power, such as motor or pump failure, the plat-
form lift cylinder and drive wheels may be operated
manually. Refer to the Emergency Lowering or Towing
section for the appropriate procedure.
Emergency Lowering
Use the following procedure to lower the platform.
1. Retract the platform extension, if possible.
2. Locate the emergency lowering lever at the rear of the
aerial platform (refer to Figure 11.1).
Figure 11.1—Emergency Lowering Lever
3. Make sure there is nothing in the way to obstruct the
platform when it lowers.
Pinch points exist on the scissors structure. Death
or serious injury can result from becoming
trapped within the scissors structure. Make sure
all personnel stand clear while lowering the plat-
form with the emergency lowering lever.
4. Push the lever down to lower the platform. Release
the lever to stop.
Towing
The aerial platform may be pushed or pulled after disen-
gaging the brakes. Use the following procedure to man-
ually disengage the brakes.
1. Restrain the aerial platform to prevent movement
when the brakes are released.
2. Turn the battery disconnect switch off.
The aerial platform is free to move when the brakes
and free-wheeling valve are disabled. Death or seri-
ous injury can result. Restrain the aerial platform
before disengaging the brakes and opening the
free-wheeling valve.
3. Use a
7
/
8
″
wrench to rotate each brake release cam
90° (refer to Figure 11.2). Rotate the cam on the right
brake cylinder counterclockwise and the one on the
left brake cylinder clockwise. Remove the wrench.
Figure 11.2—Brake Release Cam
4. Unlatch and swing out the hydraulic tray. The
free-wheeling valve is located on the hydraulic
m a n i fo l d ( r e fe r t o F i g u r e 1 1 . 3 ) . Tu r n t h e
free-wheeling valve counterclockwise to a fully
opened position. Close the tray.
Figure 11.3—Free-Wheeling Valve
5. Do not exceed 2 mph (3.2 km/h) when towing.
The aerial platform is free to move when the brakes
and free-wheeling valve are disabled. Death or seri-
ous injury can result. Close the free-wheeling valve
and reset the brakes before operating the aerial
platform.
6. Close the free-wheeling valve after moving the ae-
rial platform.
7. Manually reset the parking brakes using a wrench
or drive the aerial platform to reset them.
8. Verify that the drive system and brakes operate
properly.
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11 - 1
A
DANGER
A
DANGER
A
DANGER
Emergency Lowering Lever
Brake Cams
Free-Wheeling Valve
