A mobile viscous matter pump comprising a hydraulically operated support
construction, a distribution boom (16) and a pneumatic cushioned trailing
axle (42). To ensure stability during the pump operation, the trailing
axle (42) can be lifted by means of a lifting element (58) by bleeding
the pneumatic suspension, whereby the bleeding of the pneumatic
suspension (44) and the operation of the lifting element (58) and a
locking element (64) can be controlled according to the on-condition of
the auxiliary drive (NA) of the vehicle motor, used to supply the
hydraulic fluid of the drive hydraulics.