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 TM 55-1905-220-14-10
5-5. MARINE GEAR MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL - REASSEMBLY (Cont)
Twin Disc uses Tapered Roller Bearing sets which are selectively
27. Matched
assembled and match marked by the bearing manufacturer. Bearings
tapered
typical of this construction are Twin Disc part numbers M2427 and
roller
bearing
this type since such a list is difficult to keep current due to additions and
sets
changes. Therefore, the following general description and procedure will
help you identify and correctly assemble this type of bearing.
This type of bearing, when properly assembled, does not require further
adjustment to provide proper bearing end play*. Desired end play is
built into the bearing set by the bearing manufacturer. This built in end
play is controlled by selectively machining the various bearing parts.
Matched bearings of this type in addition to the usual bearing
manufacturer's machine stamped part number also have a hand etched
code number and suffix letters. A typical etched code number is "65-
1319". For a given bearing set all the parts of that set will be etched with
the same code number. In addition one end of the cone and one end of
the cup will have a suffix letter. (In our example above "65-1319A".)
The suffix lettered components must be assembled adjacent to each
other. (In our example above, the "65-1319A" cone must be assembled
toward the "65-1319A" end of the cup.) Failure to observe this procedure
will certainly result in premature bearing failure.
5-140
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