Section IX. DESCRIPTION, OPERATION, AND DATA (MODEL P-136-C)

TM 9-2520-246-34

Section IX. DESCRIPTION, OPERATION, AND DATA

(MODEL P-136-C)

5-22. General.

the power takeoff by removing the governor plug (D)

on the power takeoff and installing the vehicle

a. Cleaning and repair procedures are contained in

governor drive assembly so as to engage the governor

Chapter 2, section III of this manual.

gear (E) of the power takeoff drive shaft (K). When

the power takeoff exceeds a set limit of operation, the

b. Use a separate container for parts of each

vehicle engine governor cuts in, governing the output

assembly. If more than one power takeoff is being

speed of the power takeoff. On trucks powered by

rebuilt at one time, some provisions must be made for

multifuel engines, speed regulation is maintained by

keeping the parts of each power takeoff separated,

throttle position, connected by Bowden wire from the

This is especially important when some parts are to be

PTO shift lever to the control lever on the injection

used again.

pump. Normal operation of the governor section of

the injection pump maintains the engine speed

c. Power takeoff disassembly and assembly are

determined by this throttle setting.

accomplished by following the logical step-by-step

procedures. Assembly procedures are provided only

5-25. Data.

where special attention to a particular part or an

assembly is needed. Assembly of the power takeoff is

National stock number . . . . . . . . . . 2520-00-229-5673

the exact opposite of disassembly, unless otherwise

Ordnance number . . . . . . . . . . . . . . . . . . . . . . 11609228

specified. (Refer to para 5-27 for assembly sequence.)

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-136-C

Speeds . . . . . . . . One (variable with engine rpm and

transmission gear selection)

5-23. Description. The power takeoff is a single

Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transfer

drive, one-speed unit and is designed to be mounted

Output shaft . . . . . . . . . . . . . Tapered 1 in. to 1 in.

only on transfers. The power takeoff is cylindrical in

Bearing:

shape and is secured to the transfer by six capscrews.

Output shaft . . . . . . . . . . . . . . . . . . Two-roller type

A small pump (fig. 5-27), located on the exterior of

Horsepower delivered . . . . . . . Same as engine HP

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

Figure 5-27. Power Takeoff Model P-136-C.

by the vehicle governor. The governor is attached to

5-16