October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page 1-12
ART_2550
1
5
Emergency Lowering Switch
EMERGENCY SYSTEMS AND PROCEDURES
IF THE CONTROL SYSTEM FAILS WHILE THE PLATFORM IS ELEVATED, HAVE AN
EXPERIENCED OPERATOR USE THE EMERGENCY LOWERING PROCEDURE TO
SAFELY LOWER THE PLATFORM.
DO NOT ATTEMPT TO CLIMB DOWN BEAMS (SCISSORS) ASSEMBLY.
Before lowering platform, retract the deck extension.
Emergency Lowering
Note: Refer to
Lift Cylinder
.
Emergency lowering system is used to lower the platform in case of power or hydraulic failure. Plat-
form descent is controlled by a flow control orifice located under the pressure hose fitting on the lift
cylinder manifold(s). Opening the down valve on the lift cylinder(s) allows hydraulic fluid to return to
the reservoir through the pressure hose(s).
ART_2368
91083
3072ES
The Emergency Lowering “T” handle is con-
nected by cable to the down valve on the lift
cylinder.
To lower the platform, pull the red “T” handle
located at the rear of the machine. Lowering
stops when you release the “T” handle.
3772ES
The Emergency Lowering switch electrically opens the down
valves on the lift cylinder manifolds. It has a dedicated battery
to ensure operation in the event of a power failure.
To lower the platform, push
down and hold the toggle
switch. Lowering stops when
you release the toggle switch.
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