ALLIS-CHALMERS
51A
as a
reference. Thoroughly wash
all parts
and
blow
out all
passages
with compressed
air.
Inspect each part
carefully
and
discard
any
which
are
worn.
Before reassembling
the
unit, note
dimension (X—Fig.
AC51)
which
is
measured from
the
face
on the
high
pressure side
of the
casting
to the
inside
of the
groove
in the
valve
lev-
er when valve
is
held firmly shut
as
shown
in
Fig.
AC51B.
If
dimension
(X)
which
can be
measured with Ensign
gauge
No.
8276
or
with
a
depth rule
is more
or
less than
^
inch, bend
the lever until this setting
is
obtained.
Paragraph
115
A boss
or
post (T—Fig. AC51C)
is
machined
and
marked with
an
arrow
to assist
in
setting
the
lever.
Be
sure
to center
the
lever
on the
arrow
be-
fore tightening
the
screws which
re-
tain
the
valve block.
The top of the
lever should
be
flush with
the top
of
the
boss
or
post
(T).
NON-DIESEL GOVERNOR
Models B-C-CA-RC
115.
Adjust engine speed
by
short-
ening
or
lengthening quadrant lever
rod
by
means
of set
screw (A—Fig.
AC52)
to
values shown below. Linkage
adjustment consists
of
making sure
that
the
system operates freely
and
that
the
link
rod
connected
to the car-
buretor throttle shaft puts
a
slight
preload
on the
cross shaft
arm
when
carburetor throttle
and
hand throttle
are
in
full speed position. This
is
done
by having
the
link
rod 1/32
inch longer
than necessary
to
connect
its two at-
taching levers when they
are in the
wide open, full speed position.
To ob-
tain this effect,
it may be
necessary
to bend
the
cross shaft
arm
(12^—Fig.
AC52A) slightly.
Engine High Idle
B
& C 1850
CA 2000
Engine Loaded Speed
B
(BE Eng.) 1400
B
& C (CE Eng.) 1500
CA ,. 1650
18
16
^^^*?!'^'*
"' ^'
^1?^^^ governor assembly.
On
early production models,
the
gear
hub
carries
a 10-24
screw
(II.
Later
and
current models
B and C. and all
CA models
do not
Kave magneto gear screw
CD.
2.
Gear bushing
3.
Governor gear
4.
Housing gasket
5.
Control lever buahing
6. Thrust bearing
7. Governor shaft
8. Governor sbaft
9.
Governor weight
10.
Weight pin
11.
Manual control levei
12.
Cross sbaft
13.
Spring lever
14.
Cross shaft collar
15.
Cross shaft bushing
16.
Control housing
17.
Dowel pin
18.
Control lever spring
19.
Surge spring
Fig.
AC52—Models
B. C. CA, and RC gov-
emor control lever
and
quadrant. Maxi-
mum engine speed
is
controlled
by
length,
ening
or
shortening iever
rod by
means
af
set
screw
(A).
10
'^'^!i®'
i^^
governor assembly
as
used
on
engines equipped with magneto
xploded view. Later
and
current model
B, and
later model
C
governore
are
similar. Refer
tp Fig.
AC52A
for
legend.
39
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