probst JM-VARIO-200-B Operating Instructions Manual page 106

Operation
The distance "A" of the valve tappet on the upper side of the suction plate
(operating unit mounting side) is set and secured to 17 mm at the factory.
This distance must not be changed, otherwise the load could fall.
Risk of accident
If the motor fails, the load/curb does not drop (non-return valve).
Residual vacuum slowly lowers the control unit/lifting unit with the sucked-in load/curb.
Do not pull loose loads/curbs that are stuck!
Do not interrupt work (breaks) with the load/curb being sucked in, risk of overheating the vacuum blower!
Regulate the motor speed so that a minimum vacuum of - 0.4 bar is present.
52000029 / 52000029-150 / 52000029-200
Operating unit mounting
side
26 / 37 GB