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 TM 55-1905-221-14-4
6-38. TRANSFER GEAR ASSEMBLY.
a. General.
The hydraulic marine transfer gear is shown below. Power developed by the two engines is delivered through the
hydraulic marine gear system to the power drive gear (1) thence to the power driven gear (2) which is secured to and
drives the power driven shaft (3).
Each drive gear (1) is internally splined to receive the reverse gear drive shaft (4) and is mounted on two ball
bearings. The forward ball bearing (5) is carried in the reverse gear housing (6) and, the rear ball bearing (7) is carried in
the transfer gear housing (8).
Endwise movement of the drive gears is restricted by the shoulder in the bearing bore of the reverse gear housing at
the forward bearing and by the drive shaft bearing cover (9) at the rear bearing, which in turn holds the inner race of
A retaining ring groove is present in the bore of each drive gear. However, retaining rings are not used for
restraining the lateral movement of the marine gear drive shafts. Each marine gear drive shaft is held in position by a
shoulder on the shaft (at the drive gear end) and the reverse planetary retaining ring in the reverse gear assembly.
An adaptor plate (10), to which the reverse gear housings (6) are attached, is doweled and bolted to the forward face
of the transfer gear housing.
The power driven gear (2), which meshes with the power drive gears (1), is splined to the power driven shaft (3) and
positioned between a spacer (11), bearing against a shoulder on the power driven shaft at the rear, and a locknut (12) on
the forward side.
The power driven shaft (3) is mounted on a single row ball bearing (13) at the forward end, and a double row ball
bearing (14) at the rear end. The forward ball bearing (13) is carried in the adaptor plate, and the rear ball bearing is
carried in the adaptor plate, and the rear ball bearing is carried in the transfer gear housing (8).
The driven gear and driven shaft are restricted from endwise movement by locking the rear bearing against the
shoulder in the bearing bore of the transfer gear housing with the bearing retainer which, in turn, is bolted to the transfer
gear housing.
An oil seal (15) which is pressed into the driven shaft bearing retainer (16), guards against oil leaks along the drive
flange.
The drive flange (17) is splined to and retained on the power driven shaft with a nut (18) and cotter pins.
6-788
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