ALLIS'CHALMERS
Paragraph
324
Cont.
25
26 28 29
30
2 31 1 W 32 C
Fig. AC165^Model
CA
hydraulic pump hold positioning valve
assembly
whUh
is
mounted
on
top of fhe
pump
unit.
Models
WD and
WD45
are
similar except
for
differences
in
the hand control linkage
(33),
2.
Plunger
25.
Snap ting
26.
Washer
27.
Dust seal
29.
Body retaininsf bolt
30.
Valve body
31.
Ball seat
32.
Seal ringr
B.
Control lever lock
screw
C. Control valve ad-
justing: screw
W. Hold position valve
BprinsT shims
1.
Hold position valve
ball
33.
Hand control lever
34.
Snap ring
35.
Camshaft
36.
Detent ball
37.
Detent spring
38.
Seal ring
39.
Dust seal
40.
Valve body seal ring
**O"
ring
(40).
Similar rings
are
used
on
the
camshaft. Always
use new "O"
rings when reassembling
and
rein-
stalling.
UNLOADING VALVE.
To
remove
this valve from
the
pump body
re-
move
the
screws from
the
cover (57—
Fig. AC 166)
and
remove cover. Care-
fully extract valve
(54)
from body
with pliets. This valve
is
serviced
as a
selective
fit
assembly
and if
renewal
is necessary
it
should
be
replaced
as a
unit.
As an
emergency measure
a
leaking valve
can
often
be
corrected
by using
a
suitable press
to
push
a
new
ball
(16)
against
the
seat
at 5000 pounds pressure.
If
seat
orifice measures less than
3/32
diam-
eter after this procedure,
it
should
be
reamed
to
that size.
End of
plunger
(15) which
has the
drilled hole should
be assembled towards
the
ball. Valve
should unload when pump pressure
is 3400-3700 pounds.
If it is
positively
known that valve does
not
leak,
it
can
be
adjusted
to
unload
at
desired
3400-3700
lbs. by
varying shims
(X).
48
56
42
58
D.
Volume control adjust-
ing screw
X. Unloading valve spring
shims
6. Lowering control valve
sleeve
7.
Lowering control valve
11.
Unloading valve piston
12.
Pump plungers (pistons)
Fig, AC166-Models CA,
WD and
WD4S hydraulic pump.
14.
Cam followers
15.
Unloading valve plunger
16.
Unloading valve ball
17.
Unloading valve assembly
18.
Control valve sleeves
19.
Control valve plunger
20.
Discharge valve (ball)
42.
Check valve plug
43.
Gasket
44.
Spring
45.
Check valve (ball)
46.
Check valve seat
47.
Gasket
48.
Front discharge plug
49.
Rear discharge plug
50.
Spring
51.
Discharge valve seat
52.
Retainer
53.
Spring
54.
Unloading valve body
55.
Seal rings
56.
Seal ring
57.
Cover
58.
Cover gasket
59.
Back-up spring
60.
Sleeve spacer
61.
Spring washer
62.
Sealrizigi
63.
Plunger spring (11/16")
64.
Plunger spring (6/16")
65.
Car follower pivot pin
66.
Piston rod
67.
Guide
68.
Spring stop spacer
69.
Linkage loadi
70.
Snap ring
91
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