ALLIS-CHALMERS
Paragraphs 326-328
1.
Bearing cover
2.
Gasket
3.
Shaft
nut
4.
Ball bearing
5.
Shifter
6. Shifter pins
7.
Drive shaft
8. Roller bearing
9. Housing
10.
Shift arm
U. Shift
lug
12.
Snap ring
13.
Belt pulley bevel
drive gear
14.
Seal ring
15.
Hydraulic pump
intake tube
16.
Gasket
17.
Bushing
18.
Thrust washer
19.
Needle bearing
20.
Pump body
21.
Pump center plate
22.
Drive gear
23.
Gasket
25.
Pump gear (idler)
2G. Seal
27.
Shifter lever (to place
BP
in
operation)
28.
Detent spring
29.
Gasket
30.
Detent retainer
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
Detent ball
Needle bearing
Pump gear (idler) shaft
Pump gear (drive)
Dowel
pin
Spring
Plug
Gasket
Retainer
Detent spring
'TL
1
r'^^
1
^—
41.
Valve lever
42.
Valve cover
43.
Spring
44.
Adjusting screw
45.
Oil seal
46.
Control'valve
47.
Valve cover stud
48.
Ball seat
49.
Ball
51.
Detent ball
In
Fig.
ACITO^Model
G
hydraulic lift pump,
and
belt pulley drive unit which
is
mounted
on
left side
of «„-• I !i. u - r
(24)
is
used
on
housing
(9)
when unit
is not
equipped with
a
belt pullet.
"^'
UNLOADING VALVE.
The
pump
unloads only when
the
rams
are
fully
extended
or the
load
is
greater than
the pressure required
to
unload
the
pump.
To
check
and
adjust
the un-
loading valve
(15 &
16—Fig. AC164);
turn screw
(A) out of
pump body.
Turn screw
(B)
into pump body
sep-
arating
the
levers. Turn screws
(C)
and
(D) out as far as
possible.
Con-
nect
a
pressure gage
of
sufficient
ca-
pacity (5000
lbs.) to the
outlet side
(R)
of the
pressure manifold (right
rear
ram
pressure connection). With
pump operating, move hand control
lever dowmvard.
The
valve should
un-
load when
the
pressure
is
within
the
range
of
3300-3700
psi.
Adjust
the un-
loading pressure
by
adding
or
remov-
ing shims
(X)
located between retain-
er
and
unloading valve spring.
326.
TROUBLE SHOOTING. Causes
for faulty pump
or
valve operation
are outlined below:
DELAYED ACTION CANNOT
BE
OBTAINED. Screw
(C)
incorrectly
ad-
justed. Check valve
(5) not
seating.
Rams incorrectly connected. Binding
implement and/or rams. Incorrectly
adjusted linkage between pump
and
hold valve
(2).
IMPLEMENT RAISES
BUT
WILL
NOT LOWER. Hold valve
(1) not
opening. Hold position link
rod in-
correctly adjusted. Binding implement
and/or rams.
ERRATIC PUMP OPERATION.
In-
correctly adjusted implement. Binding
drawbar. Incorrectly adjusted pump-
to-hand control link
rod.
Binding
rams.
Pressure line leak. Sticking
con-
trol valves
(7 & 19).
Worn control
linkage
(8 & 9).
Incorrectly adjusted
pump-to-hold valve linkage
(3).
Leaking
*'O*'
rings. Sticking plunger
or broken plunger springs.
LOW
OIL
PRESSURE. Unloading
valve assembly
(17)
leaking
at
ball
valve
(16)
and/or
"O'*
sealing rings.
Sticking control valve
(7) in
rear
portion
of
pump. Pump plungers stick-
ing
or
springs broken. Insufficient
oil
in pump reservoir.
HIGH
OIL
PRESSURE. Unloading
valve seat orifice
(17)
restricted from
ball hammering
the
seat
or
from dirt.
Sticking control valves
(19) in for-
ward portion
of
pump.
Model
G
The gear type pump
Fig.
AC168
is
held
to the
combined hydraulic purnp
and belt pulley housing
by cap
screws.
It
can be
serviced without removing
the housing from
the
clutch housing.
If
the inner needle bearing
for
lower
pump gear
or the
drive shaft
is to be
renewed
it
will
be
necessary
to
remove
the pump
and
pump drive unit from
the clutch housing.
328.
PUMP OVERHAUL. Pump
is
removed
by
removing
the 9 cap
screws
which retain
the
pump body
(20). Be
sure
to use a
suitable
non
hardening'
sealing compound
on
screw washers
and underside
of the
head
of
each
of
the screws when reinstalling
the
pump. Refer
to
Fig. AC170.
With
the
body (cover) removed,
the
gears
and
their bearings
are
exposed
for inspection
as
shown
in
Fig. AC169.
End play
of
gears should
be
.002-,004.
The mating faces
of the
center plate
and pump body (cover)
are lap fin-
ished
to
provide
a
gasketless joint.
Avoid scratching
or
nicking
of
these
surfaces.
The
pump gear shafts rotate
in needle bearings some
of
which have
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