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13.7
Setting the pit jack brake
A
Lifting brake
The brake is used to fix the pit jack in the chassis.
The brake lever moves an eccentric. This in turn presses on the back of one of
the four rollers. This causes the two rollers of this jack axle to spread into the
chassis, braking the rollers of one jack axle and preBleeding the jack from
moving in the chassis.
The effectiveness of the lifting brake is based on the limited displacement and
the defined play between the lifting rollers and their guide in the chassis.
The clearance of the lifting rollers in the chassis must be set to min. 1 mm and
max. 2 mm.
The shims may only be added on the opposite side of the pit jack brake (on the
right in the picture).
On the second, unbraked, jack axle, the same number and thickness of shims
must be placed on the same side to prevent the jack from skewing and jamming
in the chassis.
Shim washers may already be present on delivery in order to ensure the
effectiveness of the brake despite production-related tolerances.
If the lever is overstressed or the eccentric is worn, it may be necessary to
restore the functional clearance with additional washers.
BA550001-en
A
B
B
Shim
C
C
Pit jack
roller
71
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