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4520361-1/0302
Operation - Page 1 - 9
(Emergency Controls cont'd.)
Emergency Down Controls
The Emergency Down Controls (See Figure 1-6) are located at the end of the upper boom (accessible from the platform), and
inside the base assembly (behind the inspection cover) and are intended to be used as an emergency "down" in the event of power
failure, or down solenoid valve failure. The emergency down switch lowers the upper boom by activating an electrical solenoid
valve. The emergency down system is battery powered and operates independently of normal system power. To lower the upper
boom, activate the switch in the direction of the arrow. When the problem is corrected, fully stroke the upper boom cylinder in
both the up and down directions to purge any air from the system.
Figure 1-6
Emergency Down Controls
4520362-1/0302
Courtesy of Crane.Market
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