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 62 of 153
TM 9-2520-246-34
CHAPTER 4
REPAIR OF TRANSFERS
Section I. DESCRIPTION, OPERATION, AND DATA
(MODEL T-136-27)
4-1. General.
This chapter provides the repair
instructions for positive locking transfer model T-136-
27. (See fig. 4-1 and 4-2.)
4-2. Description and Operation.
a. Description.
The positive locking transfer is a
two-speed synchromesh unit with front and rear
output shafts. The transfer unit is driven by the
regular 5-speed transmission through a propeller shaft.
Low or high gear selection through the transfer gives
the truck a total of ten forward gears, and two reverse
gears. With the operation of an air selector valve (fig.
4-1), the air locking assembly engages the front output
shaft to the rear output shaft to drive the front axle.
The transfer distributes the power to front and rear
axles through the propeller shafts. The handbrake
drum is mounted in the transfer rear output shaft
companion flange. (See fig. 4-2.) The handbrake inner
and outer brakeshoe and lever assembly is supported
on the transfer rear output rear bearing cover.
b. Operation.
The selection of high or low range in
the transfer is accomplished by a shifting mechanism,
which moves the synchronizer into contact with the
input-shaft low-speed gear or the input-shaft high-
speed gear. With positive locking engaged, power is
distributed to front and rear axles when transmission
is placed in the selected gear.
(1) Low Range.
When the transfer is shifted to
low range, the synchronizer assembly is moved
forward on the input shaft to engage the input-shaft
low-speed gear which is in mesh with the countershaft
low-speed gear. Because the low-speed gear is keyed to
the countershaft, the power flow is through the
countershaft gears, to the rear (and front if lock-up
assembly is engaged) output-shaft gears and to the
companion flanges.
Figure 4-1. Positive Locking Transfer Model T-136-27 — Front View.
4-1
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