Metso MP1000, Technical Reference Manual

Page: 167 / 180

SECTION 4 - COUNTERSHAFT, CTRSHAFT BOX & SHEAVE ASSEMBLIES
MP SERIES CONE CRUSHER TECHNICAL REFERENCE MANUAL
4-13
4.3.4 Inspection Prior to Bushing
Installation
As a precautionary measure prior to installing a
new bushing, check the diameter of the bore in the
countershaft box.
The bushings are machined to provide a fit of
0.025 mm (0.001") tight to 0.050 mm (0.002")
loose. The inside diameter of the bore and the
outside diameter of the bushing should be checked
to make certain their diameters meet these
tolerances. Should the interference be more than
the 0.030 mm (0.001"), the box must be
remachined to meet these limits. An excessive
interference fit can cause the bushing to collapse or
the bushing bore to become smaller thereby
reducing the clearance between countershaft and
bushing. If the bore is found to be smaller than
when originally machined, this bore shrinkage can
usually be attributed to extreme heat.
Check the shaft itself for straightness or run out.
With the shaft between centers, the run out should
not exceed a total of 0.102 mm (0.004"). If more
than 0.102 mm (0.004"), the countershaft should be
replaced.
Figure 4-13 Countershaft Bushing Removal by Ramming
Callout Description Callout Description
1 Inner countershaft bushing 5 Threaded rod
2 Centering plate 6 Flat bar
3 Countershaft box 7 Dowel
4 Outer countershaft bushing 8 Timber
1
8
3
2
7
6
4
5