Differential Lock - MASSEY FERGUSON MF230 Shop Manual

SERVICE MANUAL
renewed, bearing preload should be
checked and adjusted as outlined in
paragraph 159.
159. CARRIER BEARING PRE·
LOAD. The differential carrier bearing
preload is ad justed b y installing correct
thickness spacer shield (3-Fig. 155), or
shim depending on differential type,
under r ight-hand carrier bearing cup (4).
The recommended method of checking
the preload ad justment is by use of
Massey-Ferguson special
245UK). If tool is not available, an alter­
nate procedure (although not as ac­
to
curate) can be used as follows:
This adjustment procedure should be
performed with bevel drive pinion gear
(22) removed prevent interference with
movement of differential. Install dif­
ferential assembly and left-hand axle
housing, or carrier bearing housing (19),
depending on differential type. Install a
1.27 mm (0.050 inch) spacer shield, or
several shims, and bearing cup into
right-hand axle housing or carrier hous­
ing (1).
it
NOTE: A spacer shield thickness change
Is likely using this procedure. When shield
is removed Is usually distorted beyond
reuse.
Position axle housing or carrier hous­ "0"
ing (without gasket or
f erential housing and install three or
four equally spaced retaining cap screws.
Tighten cap screws evenly until end play
of differential is just removed. Rotate dif­
ferential several turns to make certain
that bearings are properly seated. Use
a f eeler gage to measure gap between ax­
le housing and differential housing at
several different locations. Preload will
be correct when measured gap is 0.43-
0.55 mm (0.017-0.022 inch) on models
with drum brake axles, or 0.25-0.38 mm
(0.010-0.015 inch) on models with disc
brake axles. Remove axle housing or car­
rier housing and change spacer or shim
thickness as necessary.
Fig. 156-VIew of differential lock pedal (12),
clevis (11) and locknut (9) used on Orchard
models and MF250 models. Refer to text for
adjustment.

DIFFERENTIAL LOCK

All Models So Equipped
160. OPERA TION. When the dif­
f erential lock foot pedal is depressed, the
axle half of coupler is forced inward to
contact the differential case half of the
coupler. If slippage is occurring at one
wheel, depressing the pedal will cause
the coupler dogs to lock the diff erential
case to the right axle. The differential
tool <MFN
and both drive wheels then rotate
together as a unit.
made by the coupler dogs, the pressure
wlll keep the differential lock engaged
and foot pedal may be released. When
ground traction on both drive wheels
again becomes equal, coupler dog con­
tact pressure will be relieved and the
coupler will automatically disengage.
161. ADJUSTMENT. On all except
Orchard models and MF250 models, dif­
f erential Jock coupler should be fully
engaged when pedal (16-Fig. 158) clears
tra t r step plate
c o
If
adjustment is required, loosen clamp
screw (17) and reposition pedal (16) on
actuating shaft (11). Retighten clamp
screw when adjustment is complete. On
dif.
ring) onto
Fig. 157-Exploded view of
differential lock actuetlng
mechanism and assoclaterl
parts used on models with
disc brakes.
I. Coupling half
2. Coupling half
3. Shin. fork
4. "0., ring
5. Actuat ing thaJ\
6. Wuher
7. Spring
8. Snap r1ng
9. L«knut
10. Boot
11. Cle._...
Pedal
12.
13. Pivot pin
Fig. 158-Exploded view of
differential lock mechanism
typical of all models except
Orchard models and MF250
models.
Axle housing (R. RJ
I.
2. Fork bracket
3. Sh01t
4. Actuating fork
P ivot bolt
6.
6. Oil seal
7. Coupling
8.
Spacer sh1eld
9. Shim
10 Bearing
l l Actuating cam
12 Pin
13 Bushing
14 Bracket
Return 6prmg
15
dal
1 6 P e
17. Clamp bolt
18. Bushing
As
soon as contact is
12 (1/2
by mm inch).
cup
Paragraphs
Orchard models and MF250 models,
pedal (12-Fig. 156) should
stop (S) when released. If not against
stop, loosen locknut (9) and turn clevis
(11) until pedal arm just contacts stop
(S). Tighten locknut (9) after aclj u stment
is complete.
162. REMOVE AND REINSTALL.
'Ib remove the differential lock coupler
halves (6 and 8-Fig. 155), first drain
transmission and hydraulic reservoir,
block up under diffet·ential housing and
remove right f ender and rear tire and
wheel assembly. Remove right lower
hitch link and disconnect right brake
linkage. Support rear axle housing
assembly in a hoist and remove retain­
ing stud nuts, then slide right rear axle
and housing as a unit away from dif·
f erential housing.
Remove bearing cone (7) from coupling
half (8). Remove the diff erential case re­
taining cap screws and lift off t.he
pling (8). Wben installing,
differential case cap screws
(80
of 108
N · m ft.-lbs.).
'Ib remove axle half of coupler on
models without planetary final drive,
upbolt rear axle outer bearing retainer
from axle housing {1-Fig. 158) and
1 59-1 6 2
be against
to
cou­
tighten
a torque
65