Paragraph 325
ALLIS-CHALMERS
CONTROL VALVES. After remov-
ing the pump, remove control housing
plate (57) and cover containing the
volume adjusting screw (D). Remove
valves (7 & 19) and sleeves (6 & 18)
from rear of pump. Keep valves and
sleeves in matched pairs. The valves
for the ram and small (5/16) plunger
form one unit which is sealed to the
body by two "O" rings (62). Reinstall
the valve sleeves and spacer (60) with
notched ends of sleeves facing rear-
ward. Spring washer (61) is installed
between spacer and sleeve as shown
in Fig. AC166. Be sure to use new
**O"
ring seals when reassembling the
unit
DISCHARGE VALVES. Seats (51)
for the discharge valves should not be
removed unless known to be defec-
tive.
A leaky valve can often be cor-
rected by reseating a new ball (20)
to same by striking the ball a heavy
blow using a one pound hammer and
a soft drift interposed between ball
and hammer. Valve seat inserts (51)
can be removed by drilling and tap-
ping the insert orifice to permit use of
a puller screw.
DRAWBAR CONTROL UNIT. This
unit, Fig. AC167, can be removed from
the rear end face of the pump after
removing the 4 bolts or screws which
retain it to the pump. Method of dis-
assembly is self evident after refer-
71
72
Fig. ACt68-Model 6
hydraulic pump, and
belt pulley unit drive
housing assembly
which is mounted on
left side of engine
clutch housing.
ring to the exploded view of the unit.
Check cams and shafts and bushings
for wear. Split type bushings may re-
quire final sizing after installation.
For final sizing use a spirally fiuted
reamer or a hone.
325.
TEST OF PUMP AND VALVES.
In the absence of a test fixture for op-
erating the plunger, the unit including
hold valve and draft control can be
tested by reinstalling it to the trac-
tor. Pump should be primed before in-
76
77 78
73
Fig, ACl67^Model
CA
hydraulic pump drawbar control which Is mounted on rear face
of pump body. Model WD is similar.
A. Draft resulatins
lock-out Berew
8. Control valve level
71.
Resrulatixiff shaft
72.
on seal
73.
Bushinff (short)
74.
Control housinsT
75.
Lever link
76.
Gasket
77.
Housing cover
78.
Pump body gasket
79.
Hand control lever
80.
Regulating cam
81.
Begulating lever
82.
Gasket
83.
Cam pivot screw
84.
Lock-out screw
spring
85.
Lock-out wrm
86.
Oil seal
87.
Oil seal
88.
Bushing
Fig.
ACl69—Model
G hydraulic pump unit
gears when pump body is removed,
stalling by turning it upside down and
pouring approved oil into inlet while
working the plungers by hand. For
temperatures above 10" F use SAE 20
or 20W oil. After running pump for a
few minutes with control lever at bot-
tom of quadrant bleed the system at
ram packing nuts.
DELAYED LIFT. To test delayed
lift valve first turn lockout screw (A—
Fig. AC164) into pump body'and lever
screw (B) out of pump body. Turn ad-
justing screws (C) and (D) out. Con-
nect a pressure gauge of 1000 pounds
capacity at point (R) in series with
the right (rear gang) ram. With the
pump in operation, move hand control
lever to top of quadrant. A gage pres-
sure of 875-975 psi should be regis-
tered before the rear gang commences
to move upward. To adjust the pres-
sure,
add or remove shims (W) lo-
cated between adjusting screw (C)
and spring.
92
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