SECTION 4 - COUNTERSHAFT, CTRSHAFT BOX & SHEAVE ASSEMBLIES
4-14
MP SERIES CONE CRUSHER TECHNICAL REFERENCE MANUAL
Figure 4-14 Countershaft Bushing Removal by Jacking
If the bore of the bushing has become smaller from
excessive pressure when installing into an
undersize countershaft box bore or if a bent
countershaft is used, the bushing could seize onto
the shaft.
Should the shaft be twisted it is to be discarded and
a new one installed.
4.3.5 Countershaft Bushing Installation
When both the countershaft and countershaft box
have been thoroughly inspected and found to be
satisfactory, the new bushings can be installed.
Should the bushings have a loose fit within the box,
just slide the bushings in over the dowels, taking
care that the oil groove in the bore is positioned as
described in step 1. If an interference fit occurs,
pack the replacement bushings in dry ice as
described in step 2 and proceed as follows:
1. Both countershaft bushings, inner and outer
are identical. However, their position in the
bore may differ. Determine the proper
location of the bushing oil groove in relation
to the countershaft box as follows:
Bushing — Sheave End
When standing looking at the crusher
sheave end of the box, the countershaft
box bushing, that is to be assembled to
the sheave end, is to have its axial
groove at a 12 o’clock position.
Bushing — Pinion End
When standing looking at the pinion end
of the box the bushing, that is to be
assembled to the pinion end, is to have
its axial groove located at a 3 o’clock
position.
2. Pack the bore of the replacement bushings
with dry ice for two to three hours to shrink
the bushings for easy installation into the
countershaft box. Approximately 50 kg
(100 lbs) of dry ice will be required for both
countershaft bushings.
Callout Description Callout Description
1 Inner countershaft bushing 5 Threaded rod
2 Centering plate 6 Flat bar
3 Countershaft box 7 Blocking
4 Outer countershaft bushing
6
1
2
3
4
5
7
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