TM-9-2520-246-34
TRANSMISSION MODEL 3052, NSN 2520-00-347-4520
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT; MAINTENANCE MANUAL
MAY 1978
TM-9-2520-246-34 - Page 36 of 153
TM 9-2520-246-34
CHAPTER 3
REPAIR OF TRANSMISSIONS
Section I. DESCRIPTION, OPERATION, AND DATA (MODEL 3052)
3-1. General.
This chapter contains the repair
instructions for transmission models 3052 and 3053A.
This section provides the description, operation, and
data pertinent to the five-speed synchromesh,
manually shifted transmission model 3052.
3-2. Description.
a. General.
Transmission model 3052, shown in
figure 3-1, is utilized on the 2½-ton, 6x6, M44 series
vehicles using a gas engine, not equipped with a front
winch. This same transmission is used with vehicles
equipped with a front winch. The transmission has a
power takeoff mounted on the left side (fig. 3-2) which
is used to drive the winch. The construction of the
transmission is illustrated in figures 3-3 to 3-11.
b. Operation.
(1) Power Flow.
The flow of power through the
transmission gear train and shafts is graphically shown
in figure 3-12. In operation, the input gear is
constantly applying power to the countershaft,
regardless of the speed selected by the operator,
because the input gear and countershaft drive gear are
continuously meshed. Because the countershaft gears
are integral with, or keyed to, the countershaft, power
is continuously available at any countershaft gear.
Due to the constant mesh of second, third, and fifth
(overdrive) gears of the mainshaft and countershaft,
locking any one of these gears to the mainshaft causes
the mainshaft to rotate at a rate proportionate to the
ratio of that gear to the countershaft gear with which
it is meshed. Rotation of the mainshaft is in the same
direction as that of the input shaft, except in reverse
gear.
(2) Reverse Gear Power Flow.
Power is
transmitted by the countershaft second-speed reverse-
idler gear and the constantly meshed reverse-idler gear
to the mainshaft first-speed reverse gear, which is
splined to the mainshaft, driving the mainshaft in the
direction opposite to the input shaft. (See fig. 3-12,
view A.)
(3) First Speed Power Flow.
Power is transmitted
by the countershaft and mainshaft first-speed gears to
the mainshaft. (See fig. 3-12, view B.)
Figure 3-1. Transmission Models 3052 and 3053A - Exterior Components.
3-1
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