MASSEY FERGUSON MF230 Shop Manual page 24

SERVICE MANUAL
plug (12), discharge jet (15), main jet
(llA) and well vent jet (14) from fuel
bowl. Remove throttle and choke valves,
shafts and packing.
Discard all gaskets and packing and
clean remainder of parts in a suitable
carburetor cleaner. Rinse in clean
mineral solvent and blow out passages
in body and bowl with compressed air.
Renew all gaskets and packing and any
other parts which are worn or damaged.
Refer to Fig. 44 and the following
specifications for the two different car­
bw·etors.
Zenith 13795
V entw-i (10)
Main Jet (1 1A) . . . No. 27
Idle Jet (6) . . . . . . . No. 16
Idle Air
Restriction . . . . . No. 28
Main Discharge
Jet (15) . . . . . . . . No. 60
Well V ent (14) . . . . No. 20
Fuel Valve
Seat (7) . . . . . . . . No. 35
Zenith OE3435
V enturi (10) . . . . .
(llB)
.
Main Jet . . . No. 18
Idle Jet (6) . . . . . . . No. 1 1
Main Discharge
Jet (15) . . . . . . . . No. 55
Well V ent (14) . . . . No. 22
Fuel Valve
Seat (7) . . . . . . . . No. 35
Assemble by reversing the disassem­
bly procedure, using new gaskets and
packing. Install throttle plate (1) so
beveled edges will fit throttle body bore
with throttle closed, with side of throt­
tle plate farthest from mounting flange
aligned with idle port. Adjust float
h
height to 7.14 mm (9/32 inch) for MF230
models, 3.97 mm (5/32 inch) for MF235
and MF245 models. Measure float
,,ght from gasket to nearest edge of
float as shown in Fig. 45. Drill bits can
Fig. 45-Drlll bit of correct size can be used as
shown to check float height.
be used as gages as shown.
is required, carefully bend float arms us­
ing needle nose pliers or a bending tool,
keeping the two halves of float parallel
and equal. Check idle mixture and idle
speed ad justments after installation as
outlined in paragraph 46.
All Gasoline Models
48. ADJUSTMENT.
be sure ignition is correct. Adjust idle
21 mm
m.m
1.35
0.80 m.m
2.80 mm
1.00 mm
1.75 mm
15 mm
0.95 mm
Fig. 46-Drawlng of throttle conrroi llnkage typical
0.55 mm
of ell except Orchard models. Refer to text for
points of adjustment and to Fig. 47 for legend.
2.75 mm
1.1 mm
1.75 mm
rod
5
Fig. 47-Drawing of throttle
linkage typical of Orchard
7
models.
4 Throttle
Foot throttle
6
Fr iction ad.Jilllling nut
Hand throttle lever
B
Spring bracket
C. Clomp orm
L
Lower hole
rod
R Re ar
S
Arm
U. Upper hole
Fig. 48-View of governor
linkage mounted
engine.
Cnrburetor control
l.
2. Governor control lever
Governor
3. rod
Throttle rod
4.
If
adjustment
GOVERNOR
Start engine and
·�-- � 9
pedal
111
front of
rod
Paragt•aph
speed stop screw (2-Fig. 4 3 t to obtain
correct idle speed of725-775 rpm. Adjust
mixture needle to obtain highest
smoothest idle, then readjust idle speed
if necessary.
Stop engine and disconnect carburetor
link (1-Fig. 48) from governor arm (2).
Move hand throtlle lever to maximum
(fast) position to create tension on spring.
Move carburetor rqd (1) to wide open
correct .
position and adjust length of rod until
approximately 1 mm (1/32 inch) too
short.. Reconnect rod afLer adjustment is
High no-load speed should be ad­
justed t.o 2200-2250 rpm for MF230
models; 2425-2500 rpm for all MF235
and MF245 models. High speed adjust­
ment is accomplished by changing the
length of rod (3).
Initial adjustment of linkage can be ac­
complished as follows: Measure length
of rod (3-Fig. 48) from centerline of
end at top to lower end of sleeve inside
spring. Conect distance is 236.5 mm
(9-5/16 inches) for MF230 models; 239.7
mm
(9-7/16 inches) for MF235 and
MF245 Orchard models; 242.9
9/16 inches) for all other MF235 and
MF245 models. Correct length f1·om
center-to-center of rod (4-Fig. 46 or 47)
is 565.2 mm (22-l/4 inches) for MF235
48
rod
mm (9-
25