Paragraphs 152-152A
hydraulic head. Remove the timing
window cover (21—Fig. AC64A) and
crank engine until the line mark on
the apex of one of the teeth on the
pump plunger drive gear is in reg-
ister with the "O" mark or arrow
stamped on the lower face of the tim-
ing window hole as shown in Fi;^.
AC64B.
Remove the two screws and
carefully withdraw the control assem-
bly, being careful not to lose plunger
sleeve pin (24—Fig. AC64A). Un-
screw and remove lube oil filter (91).
Remove the hydraulic head retaining
Stud nuts and carefully withdraw the
hydraulic head assembly from the
pump housing. Do not use force when
attempting to withdraw the hydraulic
head. If difficulty is encountered,
check to make certain that the plunger
drive gear is properly positioned as
shown in Fig. AC64B.
When installing a new hydraulic
head assembly, make certain that the
line marked plunger drive gear tooth
is in register with the "O" mark or
arrow in the timing window as shown
in Fig. AC64B and that open tooth on
quill shaft gear is in register with
punch mark in pump housing as
shown at (A) in Fig. AC65. When
installing the control sleeve assembly,
the plunger sleeve pin (24—Fig. AC-
64A) must be lined up with tTie slot
in the control block. The remainder
of the reassembly procedure is evi-
dent .
152.
REMOVE AND REINSTALL
INJECTION PUMP. Before attempt-
ing to remove the injection pump,
thoroughly wash the pump and con-
nections with clean diesel fuel. Dis-
connect the injection lines from in-
jection pump and the inlet and outlet
lines from the transfer pump. Discon-
nect the remaining lines and control
rods.
Cover all fuel line connections
with tape or composition caps to
eliminate the entrance of dirt. Crank
engine until No. 1 piston is coming up
on compression stroke and the fly-
wheel mark "FPI" is in the exact
center of the timing hole. Remove
ALLIS-CHALMERS
the pump mounting cap screws and
withdraw the pump.
152A. To install the injection pump,
first make certain that the flywheel
mark *'FPI" is in the exact center of
the timing hole when No. 1 piston is
coming up on compression stroke.
Loosen the three pump drive gear re-
taining cap screws. Remove the tim-
ing window cover (21—Fig. AC64A)
from side of pump housing. Turn the
pump hub until the line mark on the
apex of one of the pump plunger
drive gear teeth is approximately in
the center of the timing window.
Then, continue turning the hub until
the line mark (50—Fig. AC63A) on the
drive gear hub is in register with the
pointer (51) extending from the front
face of the pump. Mount the injec-
tion pump on the engine. The pump
drive gear should be meshed with
the camshaft gear so that the three
drive gear retaining cap screws are
approximately in the center of the
elongated drive gear holes when the
Fig.
AC64A ~ PartiaHy exploded view of Bosch model PSB infection pump.
21.
Timing window
cover
24.
Sleeve pin
25.
Snap ring
2G. Control unit
assembly
37.
Snap ring
38.
Gear
39.
Seal
46.
Transfer pump
_8.
"O" ring
89.
Fiiter screen
00.
Gasket
91.
Filter screw
99.
Hydraulic head
assembly
114.
Gasket
115.
Delivery \ alve
spring
117.
Gasket
Fig.
AC64B—Side view of Bosch model PSB
Injection pump with timing window cover
removed.
Notice that the line on one of
the gear teeth is in register with the "O"
mark or arrow on the housing.
Fig.
AC65—When installing a hydrauiic
head on a modei PSB infection pump, maice
certain that open tooth on quili shaft gear
is in register with punch mark In housing
as shown at (A),
46
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