9.3
REPLACING THE DUST SEAL
The condition of the dust seal (figure 9.3.1)
must be inspected every time when replacing
the liners. Replace the seal, when it is
damaged, or when the clearance between the
seal and the slip ring is more than 1.5 mm
(1/16") (figure 9.3.1), or when the upper
and/or the lower surface of the seal has been
worn.
Remove the main shaft. Screw the ringbolt
M48, which belongs to the acessory box, in the
hole on top of the main shaft and carefully and
slowly lift the main shaft (2500 kg / 5512 lbs)
away from the crusher. If you lift too fast, the
intermediate plate of the thrust bearing may
follow the upper bearing and fall back down
thus damaging the eccentric bushing.
Put the shaft on the stand supported under the
head - NOT THE DUST SEAL - or turn it on
its side taking care not to damage the upper
and lower bearing surfaces of the shaft. Do not
drop the thrust bearing against the ground, but
use a piece of rubber as a protection in between
(figure 9.3.2).
Remove the mounting bolts of the slide circle
(figure 9.3.1) (6 pcs, M16).
Remove the slide circle by screwing 4 pcs of
the mounting bolts in the threaded holes and
forcing it away.
Protect the bushing faces of the main shaft e.g.
with a rubber plate to avoid the slide circle to
damage the bearing surface (figure 9.3.3)
when removing.
Remove the slide circle and the old dust seal.
Clean the new seal and the housing and place
the seal in the head. The seal needs no
lubrication.
Lift the slide circle on the seal. Install the slide
circle with mounting bolts. Do not forget the
washers. Make sure that the seal can freely
move in the housing (figure 9.3.3). Shims may
be used between the slide circle and head if
necessary.
Figure 9.3.1 Replace dust seal if gap
between seal and slip ring is more than 1.5
mm (1/16")
Figure 9.3.3 Inspect seal movement in
housing
Figure 9.3.2 Lift the main shaft on the
ground
Other maintenance
GP200S
12/99
140548
9-3
