Paragraphs
1 1 9-1 21
MASSEY -FERGUSON
SIX-SPEED TRANSM ISSION
ferentaal housing as outlined in
paragraph 119. Remove detent springs
(4-Fig. 122) and plungers (3) from top
Models MF230, MF235 and MF245
may be equ1pped with three-speed
sliding gear :;et compounded by a dual
range planetary reduction gear set
which
prov1des six forward speeds and
two reverse speeds.
TRANSMISSION REMOVAL
All Models So Equipped
119.
'Ib
remove the complete six-speed
transmission unit from the tractor, first
drain transmission and hydraulic system
fluid and separate engine with fuel tank
from transmission as outlined in para·
graph 112.
Remove battery support with air
cleaner from tractor. Remove cap screws
attaching shift cover to top oftransmis·
sion. Attach a suitable hoist to steering
support, then
lift
steering column, in·
s
t.
J
umen
t.
panel and shift cover from
t
r
ansmi
ss
ion
.
Remove both step plates, d1sconnect
clutch pedal rod and both brake rods,
then unbolt clutch pedal bracket. Attach
hoist to transmission and support dif·
ferential housing, then unbolt transm1s·
sion from differential housing.
Install
guide studs and carefully slide
transmis·
sion forward away from differential
housing.
Rejoin transmission to differential
housing completely before installing the
attaching screws. It may be necessary to
reach through response control opening
to turn pto coupling before transmission
will slide up to differential housing.
Tighten the screws attaching differential
housing to transmission housmg to
68-75
N
·
m (50-55 ft..Jbs.) torque.
When reinstalling shift. cover, place all
gears in neutral and be sure detent pins
and springs are correctly positioned
under gasket. Lower cover into position
over guide studs making sure levers
50
Fig. 122-Exploded view of
shlfler ralls end forks of the
lype used on six-speed
models.
1 Expanaoon
plug
2
Planeuory reol
3 OtouonL plun11er
4 Spron11
5
Fork
"'" a<r•w
12 S.le<IA)r
IS S.I«U>r
lock
pon
16
Stop pia�
17
Cap
acr.,.
18
Planttary
ahofl
fork
19 Low It no••rw rail
20
Stcond
&
howh
raol
21
& 21A
Shofl
foru
engage shift rails. Tighten cover screws
to 47
N ·
m (35 ft..lbs.l torque.
Reconnect transmiSSion to engine as
outlined in paragraph 112.
SHIFTER RAILS AND FORKS
All Models So Equipped
120. 'Ib
remove shifter rai Is and forks,
first remove transmission top cover and
detach transmission housing from
dif.
F1g.
123-V'- of
pl-r.ry ..-nbly
/Mr.l'-d on
f'Hr of
trarwnla/on caN.
eut...y ..ctlon ol ,..,
pfele
{41)
ehould � on low.r rlflhl·h•nd ekH u
ehown. Cap ecrew (S) ehould
� lner.l'-d
without
lockwNh•r. Refer
to
Fig.
124
for
leg•nd.
Fig. 124-Exploded view of
plenelary assembly.
of housing. Remove shift rail interlock
plate {16) from rear of housing. Remove
set screws retaining shift forks to rails,
then withdraw shifl. rails and forks from
transmission case.
When reinstalling, be sure planetary
selector (12) is positioned with fork up·
ward and set screw hole towards outside
of case. Shifl. forks (21 and 21A) are in·
terchangeable, but shift rails (19 and 20)
are
not.
Be
sure shift. rails are positioned
so
milled flat area of each
shaft
i
s at the
rear and facing upward and the notch m
rear end of each shaft for interlock pin
is
facing mward. Tighten set screws
securely and lockwire in place.
PLANETARY UNIT
All Models So Equipped
121. The planetary unit can be
re·
moved after separating transmlSSion
case
from differential
housing. Remove
planetary
s
h
i
ft fork 08-Fig. 123) and
coupler (42). Remove cap screws retain·
ing planetary rear cover (41) and ring
gear (32) to transmission case. Withdraw
planetary carrier assembly from ring
gear, then use two screwdrivers to pry
ring gear and dowels from case.
Planet pinion shafts (39-Fig. 124) are
a tight press fit in planet carrier (40); use
a suitable press when removing and in
stalling.
Two
rows of (27 each) loose nee
dle rollers (38) are used in each planet
pinion, separated and spaced by three
washers (36). Use viscous grease to stick
thrust washers (35) to gears, and com
pletely assemble the bearing, before at
tempting to install the pinion shafts (39).
Be sure shim (30) and front plate (31)
are
positioned with cutaway slot
towards
top of planetary.
Oil
groove side of front
and rear plates (31 and 41) shouJd face
inward. Use light. coating of grease to
hold thrust. washers (33) in position.
Cutaway section of rear plate (41) should
be on bottom right-hand corner as
shown
in Fig. 123. Cap screw
(S)
should be in·
stalled without. lockwasher. Tighten re·
taining cap screws to 41-47
N
·
m (30-35
ft
.
.
Jbs.) torque.
30 Shorn
31 Front
pia�
32 ltlng
goar
33 Thruat
wuher
:u Do
31
34 33
35 Thnat
b.,r
36
Spa�r w11her
37 Planet
gear
38 Nttdle
rollero
39 Shall
40
Planet camer
41
Rear
cover
42 Shll\
coupler
33
