Elliott E190, Operation And Maintenance Manual

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Platform Install/Operation EEC-0049 V1.1
Platform Operation
The platform is permanently suspended in a yoke that can be attached to
the boom or jib head. The platform leveling system consists of a function selector
valve, a hydraulic cylinder and a hand pump assembly that includes a hydraulic
oil reservoir and handle.
Platform selector valve function positions
The leveling system can be used for the following functions:
A. Lift the yoke for alignment with the jib or boom tips for attachment
B. Swing the platform to the stow position in the yoke
C. Adjust and lock platform level when its suspended in the yoke
Lift the yoke for jib/boom head attachment
Remove the horizontal locking pin from the arm and select the PLTF LVL
CW/Yoke Up position, use hand pump to raise yoke to position for attachment to
boom or jib.
Stow the platform in the yoke
Select the PLTF LVL CCW/Yoke Down position, use pump to raise the
platform into stow position, engage the stow pins and select the float position
Release the platform from the stow position
A. Ensure the float position is selected, stand away from the platform swing
path and disengage the stow pins
B. The float function allows the platform to pivot freely until level or end of
travel of the hydraulic cylinder
Float position lock
When engaged, the flow position lock prevents accidental selection of the
float function.
To avoid unintentional platform movement , the brake should be selected and
the float lock engaged before any work commences from the platform when
boom is elevated.
Air Bleeding Process
The platform hydraulic system needs to be free of air to operate smoothly.
Any time any of the platform hydraulic lines are removed, or air is suspected in