Chapter 4 – Safety Devices
12 S2646E/S3246E – 0410051
Emergency Lowering Handle
The emergency lowering handle may be used to lower
the platform if there is a malfunction in the hydraulic or
electrical system. The handle is mounted at the rear of
the aerial platform (refer to Figure 4.4).
Figure 4.4 – Emergency Lowering Handle
The emergency lowering handle may be used to lower
the scissors arms onto the safety prop before inspecting
the machine. Pull the handle outward to lower the plat-
form. Push the handle all the way back in after lowering
the platform.
Safety Prop
The safety prop (refer to Figure 4.5) is used to support
the scissors structure when access to the scissors arm
components or the chassis is required. Always use the
safety prop when the platform is raised during inspection
and maintenance.
Figure 4.5 – Safety Prop
This protection system limits the tilt angle if a wheel is
driven into a drop-off or hole. This greatly reduces the
likelihood of the aerial platform tipping over.
The pothole protection system is for added protection
and does not justify operating near drop-offs or holes.
Drive/Lift Pothole Protector Interlock
The aerial platform drive and lift functions are interlocked
through a limit switch that senses whether or not the
pothole protection linkage is locked into position. The
drive/lift pothole interlock operates when the platform is
elevated approximately 7 to 8 feet (2.1 to 2.4 m).
If an obstruction under the skids, or some other impair-
ment prevents the skids from locking into position, the
drive and lift functions will not operate and an alarm will
sound.
Lower the platform and remove the obstruction when the
drive/lift pothole protector interlock alarm sounds.
Drive/Lift Level Sensor Interlock
The aerial platform drive and lift functions are interlocked
through a level sensor system. The drive/lift level sensor
interlock operates when the platform is elevated approxi-
mately 7 to 8 feet (2.1 to 2.4 m).
If the chassis is tilted more than two degrees side-to-
side or four degrees front-to-rear, the drive and lift func-
tions will not operate and an alarm will sound.
Lower the platform and drive to a level surface when the
drive/lift level sensor alarm sounds.
The drive/lift level sensor system is for added protection
and does not justify operating on anything other than firm,
flat, level surfaces.
Lowering Alarm
When the joystick is moved out of neutral to lower the
platform, the alarm emits a loud beeping sound to warn
personnel in the work area to stand clear.
Danger
Pinch points exist on the scissors structure. Death
or serious injury will result if the scissors structure
lowers onto personnel within the scissors arms or
under the raised platform. Stand clear while rais-
ing and lowering the platform.
Be careful when lowering the platform. Keep hands and
fingers away from the scissors structures components.
Safety Prop
Emergency Lowering Handle
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