9.5
CHANGING THE STROKE
General
There are three strokes available for the
crusher: 18, 25 and 32 mm (3/4", 1" and
1-1/4"). The stroke can be changed by turning
the eccentric bushing of the crusher. The
stroke is generated by the eccentricity of the
eccentric bushing. At the same time the
adjustable counterweight has to be turned to
right position corresponding the stroke. The
counterweight is bolted to the hub locating
under the slipring. To change the stroke, the
upper and intermediate frames, main shaft and
the slipring must be removed. The top bearing
needs not to be replaced, it is the same for all
strokes.
Dismounting the crusher
Remove the upper and intermediate frame
from the lower frame according to the chapter
8.2 and lift it on the stand.
Remove the main shaft. Screw the eyebolt
M48, which belongs to the accessory box, in
the hole on the top of the main shaft and lift
the main shaft carefully (2500 kg / 5512 lbs)
away from the crusher.
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 9.5.1).
Remove the wear cover from the slipring by
unscrewing three bolts (M16) locating radially
under the wear cover. Unscrew the fastening
bolts and loosen the slipring of its guidance by
three jack bolts. Mount the eyebolts and lift the
slipring away.
Unscrew the mounting bolt (M10) of the
eccentric bushing. The bolt is secured with
locking compound, which can be softened by
heating.
Remove the eccentric bushing with the
special tool (figure 9.5.2). The key comes out
with the bushing. Place the bushing away.
Check the thrust bearings, one mounted below
the main shaft (figure 9.4.1) and the other
(figure 9.4.1) on the adjusting piston. They
must be replaced when the depth of the oil
grooves is 3 mm (1/8") or less (new grooves 5
mm/ 3/16"). The condition of the intermediate
plate (figure 9.4.1) must also be checked, and
replaced if necessary. See chapter 9.4.
Figure 9.5.1 Put the shaft on the stand
Figure 9.5.2 Remove the eccentric bushing
with the special tool
Other maintenance
GP200S
12/99
140548
9-5
