Twin Disc MG-5170DC, Service Manual

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Twin Disc, Incorporated
Description and Specifications
Marine Transmission Service Manual #1020667
Lubrication Features
The MG-5170DC transmission has a lubrication tube located inside the main
housing. The tube extends from the front to the rear of the inside of the
housing. The lubrication tube has drilled holes in the tube that spray oil on the
transfer gears and the primary and secondary pinions. Bearings and clutches
on the primary and secondary shafts are lubricated through drilled passages
in the shafts. Output shaft bearings are gravity and splash lubricated.
Suction Strainer
The marine transmission has a serviceable suction strainer located below the
oil pump. The strainer is between the sump and the oil pump in the hydraulic
circuit. The strainer can be replaced if necessary.
Filter Assembly
A spin-on oil filter is located between the heat exchanger outlet and the selector
valve in the hydraulic circuit. The replacement element is Twin Disc part number
XB3614A. This should be replaced at 1000 hour or six month intervals, whichever
comes first.
Gears
All gears are helical, carburized, hardened and ground for smooth quiet
operation. All gears are in constant mesh. The primary and secondary transfer
gears and the output gear are mounted on keyless tapers.