8.4
REPLACING THE MANTLE
The mantle can be replaced after removing the
upper and intermediate frame, without
removing the main shaft. The thrust bearings
should be inspected at least once a year. To
inspect the thrust bearings, the main shaft
should be lifted out of the crusher. See the
chapter 9.4.
If you are going to remove the main shaft,
screw the ringbolt M56, which belongs to the
accessories of the crusher, in the hole on the
top of the main shaft and lift the shaft (2500
kg / 5512 lbs) away carefully. Put the shaft on
the stand supported under the head - NOT THE
DUST SEAL - or turn it on the 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
8.4.1).
Torch cut or grind away the torch ring (A,
figure 8.4.2) between the nut and mantle
carefully to remove the mantle.
Turn the tightening nut (B, figure 8.4.2)
clockwise by hammering it with a sledge
hammer, until it gets loose. If needed, weld a
hit plate on the nut. If the nut does not get
loose, torch cut it in two pieces. Do not damage
the thread in the shaft.
Lift the mantle and the nut away together.
Before lifting, ensure that the lifting hooks are
in safe condition. Repair them by welding if
necessary. If the mantle does not get loose, use
a sledge hammer to strike the mantle several
times to loosen it. Move the mantle out of the
way.
Clean and inspect the mantle seating surfaces
on the head and repair if necessary.
Check the condition of the dust seal and
replace it if necessary. Remove the dirty
material from the surfaces. The clearance
between the dust seal and slip ring must not
exceed 1.5 mm (1/16"). See the instructions in
chapter 9.3.
Figure 8.4.2 Torch ring (A) and fastening
nut (B)
Figure 8.4.3 No clearance is allowed
between the liner and head
Figure 8.4.1 Lower the main shaft on
ground
GP200S
Liner replacement
8-6
140548
12/99
