Quill Shaft Assembly.

TM 9-2910-226-34

NOTE

refer to figure 1-16. The tappet assembly is

The hydraulic heads on code F and G in-

located between the camshaft and the lower

end of the fuel plunger. It consists of a

jection pumps, (fig. 1-14 and 1-15) had

additional passages that directed the flow of

tappet roller (YY), tappet roller pin (F), and

lubricating oil to the lower portion of the fuel

a tappet guide (G). The tappet guide con-

tains a slot which rides on the tappet guide

plunger and the plunger drive gear. If these

hydraulic heads are replaced by later model

pin in the injection pump housing.

heads it will be necessary to plug the oil

1-12. Quill Shaft Assembly.

passage in the injection pump housing with

NOTE

parts kit 5704374.

The key letters shown below in parentheses

d. The fuel plunger is lapped and fitted into the

refer to figure 1-13. The quill shaft assembly

hydraulic head as well as in the plunger sleeve. Two

transmits the rotary motion of the camshaft

parallel flat surfaces on the lower extension of the

to the fuel plunger at one-half camshaft

fuel plunger lock the plunger drive gear with the

speed. The quill shaft assembly consists

plunger guide (M). The plunger guide is designed to

of a quill shaft (L), quill shaft bushing (K)

shear if the fuel plunger freezes,

two shaft spacers (H), and a camshaft

e. The drive gear thrust washer (Q) is placed

driven gear (G). The quill shaft assembly is

between the drive gear and hydraulic head to take

held in position in the injection pump hous-

the thrust of the plunger drive gear, The spring

ing by a machine screw (J).

upper and lower seats (L and H) and plunger inner

spring (K) are held on the plunger by two plunger

1-13. Governors (Typical).

locks (J), The plunger button (X) mates the round

NOTE

surface of the fuel plunger end to the flat surface of

The key letters shown below in parentheses

the tappet guide (G). The preceding components are

refer to figures 1-16 and 1-17, except where

fastened to the head by the drive gear retainer (N).

otherwise indicated.

This retainer is cut away to permit the meshing of

a. The governor, with its weight and spider

the plunger drive gear with the quill shaft gear and is

assembly attached to the camshaft, is an integral

also used for fuel pump timing.

part of the fuel injection pump. The governor is a

1-9. Overflow Valve Assembly. The overflow valve

variable speed, mechanical and centrifugal type. The

assembly (A, fig. 1-13 ) returns the excess fuel from

governing action is accomplished by two governor

the hydraulic head to the vehicle fuel tank. The valve

weights (UU) acting against a movable sliding sleeve

assembly is located on the fuel outlet passage of the

(VV) which is backed up by governor inner and outer

hydraulic head. It consists of an overflow valve and

springs (RR and SS) loaded in opposite directions.

valve spring which maintains a constant fuel

(1) The governor on code A injection pump (fig.

pressure in the hydraulic head. The overflow valve

1-1 7) is the same except a torque control link ((D),

has a small opening which allows any air ac-

fig. 1-18) has been added.

cumulation in fuel passages to escape. The opening

(2) The control link retards governor action

also serves as a continuous bleed of fuel to permit

during automatic transmission shift and does not

cooling of the pump.

allow engine speed or torque increase during the

1-10. Camshaft.

change of gear ratios within the transmission. This

NOTE

action alleviates shift shock to the transmission.

KEY to fig. 1-18

The key letters shown in parentheses refer to

A Weight and spider assembly

figure 1-16. The camshaft (ZZ) is supported

B Oil baffle

at the front of the fuel pump housing by the

C Torque link spring

camshaft ball bearing (AB) and at the rear

D Torque link

by the camshaft bushing type bearing (XX).

E Guide

The camshaft is comprised of a shaft with a

F Sliding stop wedge

G Smoke limit

three-lobed cam and a spiral worm gear. The

E Stop plate

worm gear drives the quill shaft and the fuel

J Fulcrum lever assembly

supply pump.

K Torque link pin

L Contact surface

1-11. Tappet Assembly.

M Operating shaft

NOTE

N Torque link pin

The key letters shown below in parentheses

P Contact surface

1-20