Twin Disc MG-5170DC, Service Manual

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Twin Disc, Incorporated
Disassembly
Marine Transmission Service Manual #1020667
4. Remove and disassemble pinion(s).
A. Remove round retaining ring from input end of shaft and remove
pinion from shaft.
B. Remove internal retaining ring from input end of pinion and
remove straight roller bearing.
Note: The straight roller bearing in the bore of the input end of
the pinion is a tight fit, and will likely be destroyed during
removal. Remove the straight roller bearing with the use
of a puller behind the roller ends.
Figure 50. Removing Round Retaining Ring From Input End Of Shaft
C. Remove tapered roller bearing outer race from bore at rear of
pinion if bearing requires replacement. This bearing race is an
interference fit in the pinion bore. To remove, use an electric
welder to weld a light bead around the I.D. of the bearing race.
This will shrink the bearing cup to facilitate removal. Bearings
removed with this method must be replaced.