Pneumatic System
The pneumatically operated functions control on/off, up, down and, where applicable, the side-
to-side traversing motion of the lift and/or gantry. A methodical check of the pneumatic system
starts from the hand control and works forward through the pneumatic switches on the circuit
board.
Hand Control & Airline
Unplug the hand control airline from the lift and check for blockage of the airlines by pressing
each of the function buttons in turn. A small blast of air can be felt from the brass pins at the
end of the curly cord.
Air Tubes
• Re-attach the hand control airline to the lift. (The airline end plug has a cap that has a
raised ridge on one face. The raised cap ridge aligns with and slides over the ridge on
the grommet. Correct insertion can thus be verified by touch and by sight.) Check to see
that the air tubes have been routed free and clear. If not routed properly, air tubes can
get trapped by wires, other lift components or the lift cover.
• Check to see that the air tubes are correctly connected to the circuit board switches. The
air tubes attached to the main board are color coded to correspond to the circuit board
functions (up, down X+, X-, Y+ and Y-).
• Next detach one air tube at a time from the circuit board. Check for leaks in an air tube
by pressing the function key corresponding to that air tube (the function is printed by the
air switches), then pinch the open end of the air tube between two fingers, then release
the function button. The dome of the button should stay slightly compressed when the
button is released. Repeat for each air tube.
• Air tubes are fragile. In detaching and re-attaching air tubes, do not press on the air
tubes with fingernails and be careful not to pierce the tubes with the connector pins.
• If NO air leak is found, then proceed to check the electrical system.
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