probst JUMBO-BV-VARIO Manual page 32

Operating
JUMBO-BV-VARIO-B
V2
When engine breakdown the load/kerb stones does not fall down (check valve).
Residual vacuum lowers the operating valve unit/lifting hose unit with the sucked in load/kerb stone slowly.
Do not use the device to jerk [sic!] seized loads/kerbstones!
No work stoppage (pause) with sucked load/kerb stone, danger of the overheating of the vacuum blower!!!
Adjust engine speed in such way that a minimum vacuum of -0.42 bar is present (see  manometer at the operating
valve unit).
26/07/16
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