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 115 of 153
TM 9-2520-246-34
Section IX. DESCRIPTION, OPERATION, AND DATA
(MODEL P-136-C)
5-22. General.
a.
Cleaning and repair procedures are contained in
Chapter 2, section III of this manual.
b.
Use a separate container for parts of each
assembly. If more than one power takeoff is being
rebuilt at one time, some provisions must be made for
keeping the parts of each power takeoff separated,
This is especially important when some parts are to be
used again.
c.
Power takeoff disassembly and assembly are
accomplished by following the logical step-by-step
procedures. Assembly procedures are provided only
where special attention to a particular part or an
assembly is needed. Assembly of the power takeoff is
the exact opposite of disassembly, unless otherwise
specified. (Refer to para 5-27 for assembly sequence.)
5-23. Description.
The power takeoff is a single
drive, one-speed unit and is designed to be mounted
only on transfers. The power takeoff is cylindrical in
shape and is secured to the transfer by six capscrews.
A small pump (fig. 5-27), located on the exterior of
the carrier (fig. 5-27), pumps lubricant from the
transfer case into the power takeoff carrier; the
lubricant then flows back into the transfer case
through the input shaft or relief valve. The pump is
driven by the power takeoff output shaft (fig. 5-27).
The center of the output shaft contains a pump cam
lobe (C, fig. 5-28) which raises and lowers the pump
plunger (N, fig. 5-28) thus creating the suction that
pulls the lubricant from the transfer case. There are
two check valves (V, fig. 5-28) in the oil pump instead
of one at the transfer case. The jaws of the clutch
halves (A and P, fig. 5-28) are designed to provide
highly efficient lubrication and drive in both directions
of rotation. Shifting is accomplished by the shift lever
(fig. 5-27) mounted on the side of the power takeoff
carrier, which moves the shifter shaft (fig. 5-27) and
shifter fork (B, fig. 5-28) back and forth to engage or
disengaged the power takeoff sliding clutch (A, fig. 5-
28) from the transfer output shaft driving clutch (P,
fig. 5-28).
5-24. Operation.
NOTE
The reference letters in parentheses pertain
to figure 5-28.
On trucks powered by gasoline engines, the
speed at which the power takeoff operates is governed
by the vehicle governor. The governor is attached to
5-16
the power takeoff by removing the governor plug (D)
on the power takeoff and installing the vehicle
governor drive assembly so as to engage the governor
gear (E) of the power takeoff drive shaft (K). When
the power takeoff exceeds a set limit of operation, the
vehicle engine governor cuts in, governing the output
speed of the power takeoff. On trucks powered by
multifuel engines, speed regulation is maintained by
throttle position, connected by Bowden wire from the
PTO shift lever to the control lever on the injection
pump. Normal operation of the governor section of
the injection pump maintains the engine speed
determined by this throttle setting.
5-25. Data.
National stock number . . . . . . . . . . 2520-00-229-5673
Ordnance number . . . . . . . . . . . . . . . . . . . . . . 11609228
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-136-C
Speeds . . . . . . . .
One (variable with engine rpm and
transmission gear selection)
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transfer
Output shaft . . . . . . . . . . . . . Tapered 1½ in. to 1 in.
Bearing:
Output shaft . . . . . . . . . . . . . . . . . . Two-roller type
Horsepower delivered . . . . . . . Same as engine HP
Figure 5-27. Power Takeoff Model P-136-C.
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