Adjusting The Hovering Position (Without Load) - probst JWK Serie Betriebsanleitung

Vacuum Hose Lifter Components
Lifting hose unit with Operating Valve Unit
Danger
4.2 Adjusting the
Hovering
Position (without
load)
Danger

Mount the rotary suction fitting (7) to the transport trailer (5) of the crane.
Fasten it safely! Insert the transport trailer into the crane jib (2).

Mount the end stop (6) at the end of the crane jib. Never work without an end
stop on the crane jib, otherwise the lifting device can fall off.

Connect the suction hose to the rotary suction fitting (4) and secure it with a
hose clamp.
If you install the suction hose, note that the hose contracts under the pressure of
vacuum by approximately 10 to 15 %.
Therefore, a loose installation with length compensation should be provided.
Longer, linear distances can also be bridged with a plastic pipe. The overall length
should not exceed 50 m. Long suction hoses reduce the capacity and the
dynamics of the tube lifter.
The hovering position of the lifting device must be adapted to the weight of the
vacuum head. A valve (2) in the tube support cylinder is used to adjust it.
When you apply the vacuum head to the load a valve is fully opened by a plunger
and the valve rod in the vacuum head. The load can be sucked and lifted.
Adjustment:

Turn the adjustment screw (1) at the operating unit (accessible from the
bottom).
Turn clockwise (direction of arrow)
Turn counter-clockwise

The farther the valve is opened the lower the device hovers.
When the valve is closed totally the device bounce up abruptly as soon the blower
is switched on!
Status 08.2012 / Index 05
 Valve becomes opened.
Valve becomes closed.
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