Support device for a mobile piece of equipment

The invention relates to a support device (18) for a mobile work machine, in particular a truck-mounted concrete pump (10), with a support leg (20) and a pendulum foot (22) which is mounted at a lower articulation point of the support leg (20) so as to be swivellable in all directions and which can be supported on a surface (24), wherein the articulation point comprises a bearing cup (32) and a ball head (30) secured in the bearing cup (32) by releasable connecting means (40). According to the invention, it is proposed that the connecting means (40) comprise an elastomeric sealing ring (42) which seals around the ball head (30) and a locking ring (44) which fixes the sealing ring (42) at the edge of the bearing cup (32) and which tensions against the ball head (30).