ALLIS-CHALMERS
Paragraphs 322-324
14
Fig. ACI6l-Mocrefs
1.
Pump body
2.
Discharge valve insert
3.
Discharge valve ball
4.
Discharge valve
springr
6. Discharge valve plugr
6. Relief valve plus
7.
Control rod
9. Relief valve insert
10.
Relief valve ball
11.
Relief valve spring
plunger
B,
and C
power lift hydraulit pump—exploded view
12.
Relief valve thimble
13.
Control shaft
14.
Torsion spring
16.
Shaft oil seal
17.
Plunger spring
19.
Intake valve insert
pin
20.
Intake valve sleeve
21.
Intake valve ball
22.
Intake valve plug
23.
Intake pipe
24.
Plunger
25.
Cam arm
26.
Cam roller
27.
Cam arm pin
30.
Washer
31.
Gasket
32.
Relief valve spring
33.
Control plate
34.
Friction plate
35.
Lowering rate ad-
justing screw
37.
Intake valve insert
38.
Gasket
Fig. AC 162
-
Modmis
B, and C
fiydroufic
pump dhcharge yalves which were
used
in
diWmrenf
style pumps.
(A)
Part
No.
213471
at used
in
pumps with serial number AT
and
up,
(B; Fart
No.
213005
as
used
in
pumps with serial number 2585
fo
10114.
(C) Fart
no.
211360
as
used
in
pumps with
serial number prior
to
2585.
If intake valve plugs will
not
screw
all
the way in
when insert
is
clear
of
plunger spring, install extra copper
ring gasket between head
of
plug
and
pump body.
In
some cases
the
valve
plugs
can be
used
as
screw pushers
to move
the
seat inserts into position
after
the
inserts have been pressed
in
far enough
to
permit engaging
the
first three threads
of the
plug.
Seat
new or old
valves after instal-
lation (except relief valve)
by
tapping
balls against their seats with
a ham-
mer
and
soft punch.
322.
TEST
OF
PUMP AND VALVES.
In
the
absence
of a
test fixture
for op-
erating
the
plungers
the
unit
can be
tested
by
reinstalling
it to the pto
housing. Before doing
so
however,
first turn
the
pump upside down
and
prime
it by
pouring approved fiuid
into inlet while working plungers
by
hand.
If
only
one
copper washer
is
used under
the
pump attaching screws
it should
be
under
the
head
of the
long
screw
in
front lower hole
in
pump.
After running pump
for a few min-
utes bleed
the
system
at ram
packing
nuts with control
in
raised position.
Retighten
the
packing nuts before
moving
the
control
to
"lowering"
po-
sition.
Attach pressure gauge
to
pump
out-
let. Operate pump with control valve
in "lift" position until pressure reach-
es 3,200 pounds,
and
relief valve
opens.
Relief valve opening will
be
accompanied
by a
squealing
or
chat-
tering noise
in the
pump.
If
relief
Fig, AC163-Model WD
hydraulic lift pump
installation
on
right
side
of
tractor torque
tube. Model WD4S
is
similar.
valve opens below 3,200 pounds, push
relief valve seat deeper into pump
so
as
to
increase
the
effective spring
pressure. With pressure
at
about
3,100
pounds
and
control valve
in
"lift"
po-
sition, stop pump
and
watch pressure
drop.
Pressure drop should
be
slow
and should
not
drop below
1,500
pounds.
The
same results should
be
obtained when test
is
repeated
in
"hold" position.
With adjusting screw backed
out,
move control valve
to
"lowering"
po-
sition.
If
pressure does
not
immediate-
ly drop
to 100
pounds
or
less, relief
valve seat
has
been driven
too
deeply
into pump body. Turning adjusting
screw
in,
retards lowering rate.
Models CA-WD-WD45
Pump
on
model
CA is
mounted
on
the side
of the
m,ain
pto
housing which
is bolted
to the
rear face
of the
trans-
mission housing
as
shown
in Fig.
AC150.
The CA
pump
is
driven
by 4
cams which
are
integral with
the pto
shaft
On WD and
WD45, pump
is
mounted
on the
right side
of the
torque
tube,
as
shown
in Fig.
AC163
and re-
ceives
its
drive from
4
cams which
are
integral with
the
engine clutch shaft.
Both pumps,
Fig.
AC164,
are of the
4 plunger type having
3
plungers
oj
11/16 inch diameter
and one
plunger
of
5/16
inch diameter. Bolted
to the
top
of the
pump body
is a
subassembly
called
the
hold position valve—and
to
the rear face
is
another subassembly
which
is the
draft control Hydraulic
system
on
these tractors includes
two
rams,
(a
remote
ram is
available
for
trail type implements)
a
rockshaft and
a load measuring spring providing
draft control.
324.
R&R AND
OVERHAUL.
On
CA
to
remove pump
and
hold valve
unit disconnect hand control linkage
and hoses
and
unbolt pump
and
valve
unit from
pto
housing.
The
hold valve
may
be
detached from
the
pump
before
or
after removing
the
pump
from
the pto.
On models WD
and
WD45
to
remove
the hydraulic pump, proceed
as fol-
lows:
Remove magnetic type drain
plug from pump section
of
torque
tube.
Disconnect pump-to-ram hose
89
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