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 TM 55-1905-219-14-10
5-5. MARINE GEAR MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL - REASSEMBLY (Cont)
27. Matched
Twin Disc uses Tapered Roller Bearing sets
tapered
which are selectively assembled and match
roller
marked by the bearing manufacturer. Bearings
bearing
typical of this construction are Twin Disc
sets
part numbers M2427 and M2551 in MG-514 Marine
Gears. It is not practical to list all bear-
ings of this type since such a list is
difficult to keep current due to additions
and 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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