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Massey Ferguson 5445, 5465, 5470 - Rear axle differential
The crown wheel and pinion, driven by the gearbox output shaft, drives
the rear axle. The helical pinion is supported on either side of its
teeth by two tapered roller bearings fitted in opposition. Lubrication
of the bearing (30) (37) is ensured by a flow of transmission oil from
the PTO top cover plate located at the rear of the MF 5435, 5445, 5455,
5460, 5465, 5470, 5475 tractor. The bearing cones are force fitted to
the pinion and the rear cup, smeared with Loctite 603, is also force
fitted in the rear axle housing. The front cup is free in its bore to
allow for shimming of the pinion.
The ring gear is fixed to the differential unit by rivets. The
differential assembly turns on two tapered roller bearings supported by
two lateral flanges centred by rings and screwed to the rear axle
housing. The differential assembly comprises two half-units holding two
planet gears for models up to 75 hp and four planet gears for models
whose power output exceeds 75 hp. The unit also holds two sun gears. The
pinion is fitted in the rear axle housing.
The crown wheel and pinion is adjusted using shims fitted between the
centre housing and the bearing cup (37). The pre-loading of the tapered
roller bearings (31) (33) and (30) (37) is obtained by shim(s) placed
between the hand brake plate and the centre housing. The pre-load
shimming of the differential assembly is carried out by deflectors (13)
of different thicknesses fitted behind the left-hand bearing cup (14).
If needed, an additional shim (49) can be fitted between flange (9) and
the deflector.
Massey Ferguson 5435, 5445, 5455, 5460, 5465,
5470, 5475 - Removing the differential assembly
Disconnect the tractor between the gearbox and the rear axle (the cab
remains attached to the gearbox). Remove the wheels. Separate the left
and right-hand trumpet housings from the centre housing. Remove the
linkage cover plate. Remove the hitch hook support. Remove the PTO top
cover plate, the driving gear and the intermediate shaft. Take off the
pipe (40).
Remove the brake pistons. Carefully fit a sling to the differential
assembly using a clamp. Before working on the screws (56) and the nut
(42). Loosen the screws (56) and the nut (42) alternately to gradually
release the spring (6). Remove flange (9), the spring (6), the dog
clutch (7) and the washer (11). Remove the screws (26). Remove the
flange (25). Take out the differential assembly from the centre housing.
MF 5435, 5445, 5455, 5460, 5465, 5470, 5475 -
Disassembling the differential assembly and the ring gear
Disassembling the differential assembly
Place the differential assembly on a workbench. Extract the cones (17)
(28) and cup (27), recover shims (38). Mark the two half-units (29) with
two joining paint lines. Remove the screws (15). Remove the fixed dog
clutch (16). Separate the two half-units (29).
Remove the washers (18), the sun gears (19), the planet gears (20), the
washers (21) and the spider (22). If the ring gear is replaced, the
pinion must also be replaced. These components both bear the same
number. They must be fitted as pairs. The ring gear and unit are
originally assembled using rivets. During repairs, these rivets are
replaced by screws and nuts.
Disassembling the ring gear
Remove the ring gear from the unit. Centre punch each rivet (24) (on the
toothed side of the ring gear). Using a 5 mm drill bit, drill the rivets
to a depth of 10 mm. Carry out a second drilling operation with a 12 mm
drill to the same depth. Drive out the rivets using a suitable pin
punch.
Removing and disassembling the pinion
Remove: right and left-hand hydraulic cover plate assembly; circlip (1);
gear (2) (if fitted); hand brake mechanism assembly; screws (32), the
thrust plate (35) and the shims (36); cup (33) and the pinion complete
with cones (30) and (31); lubrication pipe (47). Remove and discard the
plug (41), extract the cup (37) and recover the shims (50).
Disassembling the pinion - Extract the cones (30) (31).
Massey Ferguson 5435, 5445, 5455, 5460, 5465, 5470, 5475 - Reassembling
the ring gear and the differential assembly
Reassembling the ring gear
Check that the ring gear and pinion bear the same number. Clean the
mating faces of the new ring gear (23) and the unit (29) and the nuts
and screws referenced in the spare parts catalogue.
Smear the first threads of the screws (1) with Loctite 270 and place
them in the ring gear and unit. Tighten and lock the nuts (2) to a
torque of 150-160 Nm.
MF 5435, 5445, 5455, 5460, 5465, 5470, 5475 - Reassembling the
differential assembly
Check the components and replace those that are defective. Reassemble
the differential assembly. Smear the screws (15) with Loctite 270 then
tighten to a torque of 85-130 Nm. The clearance "J1" between the planet
gears and the sun gears must be between 0.08 and 0.30 mm. Insert the
cones (17) (28) respectively in the bottom of the shoulder of the fixed
dog clutch (16) and the right-hand flange (25), using a press and a
suitable fixture. Place shim(s) (38) in the half-unit (29) to pre-adjust
the backlash and then Install the cup (27).
Adjusting the taper distance
Check the components and replace those that are defective. Using a press
and a suitable fixture, Install the cone (30) fully onto the pinion
shoulder.
The taper distance must be adjusted before the pre-load shimming of the
pinion bearings. The thickness of shims "E" (50) required to position
the pinion is calculated according to the formula below: E = Z + T - (X
+ Y). E = 184.955 + T - (X +90.520).
Z - Nominal pinion dimension = 184.955 mm, T - Correction of the nominal
dimension engraved on the end of the pinion; this may be a positive or a
negative value, X - Dimension of the centre housing stamped on the rear
right-hand side of the housing, behind the lift ram, Y - Dimension of
the pinion with bearing = 90.520 mm.
Reinstall
Using a press and a suitable fixture, Install the bearing cone (31)
fully onto the pinion shoulder. Install the shims (50), their thickness
determined by the above formula. Lightly smear the external surface of
the cup (37) with Loctite 603 or equivalent and Install it to make
contact with the shims (50) using a suitable fixture. Eliminate all
traces of Loctite. The cones and cups must be cleaned and lubricated
after fitting. Install the pinion and the cup (33).
Determine a thickness of shims greater than the overhang dimension "a"
on the cup (33) measured in relation to the housing face to obtain a
provisional clearance of 0.10 mm to 0.15 mm maximum for the preload
shimming that follows.
Screw two diametrically opposed guide studs onto the housing. Place the
shims (36) determined during step and Install the thrust plate (35).
Install and tighten the screws (32) to 90-120 Nm after removing the
studs.
Shimming the pinion
Remove or add shims (36) to obtain a pinion rotational torque of 0.80 to
2 Nm, measured using a Dial type torque wrench, with the pinion turning
at approximately 1 to 5 rpm. Once the correct torque has been obtained,
refit the screws (32) lightly smeared with Loctite 270 or equivalent,
then tighten to a torque of 90 - 120 Nm.
Position the plug (41) in the housing, then refit the union (52) and the
lubrication pipe clip nuts.
Massey Ferguson 5435, 5445, 5455, 5460, 5465, 5470, 5475 - Reinstall and
shimming the differential assembly
Reinstall the right-hand flange (25) - Carefully place the assembled
differential in the housing. The right-hand flange (25) is assembled on
the centre housing in a similar way to the left-hand flange (9). The
positioning is ensured by the locating ring (45). Reinstall the
left-hand flange (9). Remove the cup (14) and the deflector (13) from
the flange (9). Place the cup on the cone (17). Install the tool on the
housing, using two screws (56) tightened to a torque of 85-100 Nm.
Tighten the central screw to a torque of 10 Nm. Check that the ring gear
is not restricted by the pinion and turn it several times to correctly
"seat" the cones in the cups. Check the tightening torque of the tool
central screw again.
Assemble and moderately tighten the hexagonal calibrated spacers "A" in
the other two holes. Check that they are in contact with the housing.
Carry out shimming to obtain: P2 = 0 to 0.25 mm.
Place a ruler edge against the two calibrated spacers. Using a set of
shims, measure the clearance "J" between the finger of the tool and the
ruler "B".
Calculate the dimension "C" between the cup (14) and the mating face of
the flange (9). C = (114 + J) – 70.
On flange (9), measure dimension "Y" using a depth gauge and a ruler.
Select the thickness "E" of the deflector (13) and shim (49) (if used)
to obtain: E = P2 + (C - Y).
To carry out "P2" shimming, there are nine classes of deflector, each of
a different thickness. If possible, shim to the maximum tolerance.
Remove the shimming tool and cup (14). In flange (9), place deflector
(13) and shim (49) (if used) and cup (14). The shim (49) (if used) must
be fitted between the flange (9) and the deflector (13). Ensure the
deflector is fitted in the right direction.
Reinstall the flange (9). Install the pipe (40). Check the backlash.
Adjusting and checking the backlash
The backlash between the ring gear and the pinion ensures crownwheel and
pinion reliability and correct operation of the assembly. This backlash
must be checked or adjusted after: adjusting the taper distance,
shimming the differential unit.
Preadjustment - Prepare a thickness of shims (38) of 0.30 mm. Do not
take into consideration the DC (ring gear offset, e.g. -0.20) engraved
on the external surface of the ring gear after the pairing number. The
pre-adjustment can be followed by an adjustment at a later stage, if the
backlash is incorrect during the final check. Install the previously
prepared shim(s) in the cavity of the half-unit (29). Lubricate and
Install the cup (27). Reinstall and shim the differential assembly unit.
Checking the J2 backlash (J2 = 0.15 to 0.40 mm) - Place the dial gauge
feeler pin half-way along a ring gear tooth. Check that the backlash is
between 0.15 and 0.40 mm. Carry out this check on three points of the
ring gear, at intervals of approx. 120°. If the backlash is incorrect,
select and Install a new thickness of shim(s). Then offset the ring gear
(23) in the desired direction, by increasing the value of the shims (38)
and by reducing by the same amount the thickness of the deflector (13)
or vice versa, in order to obtain the required backlash, without
modifying the differential unit preload.
Reinstall the hand brake mechanism assembly. The plate (5) is
rectangular. It must be positioned horizontally, lengthways, so that the
pin (6) is correctly positioned against the rod (13). Reinstall the gear
(2) (if fitted) and the circlip (1).
Reinstall the left-hand cover plate. Install the hand brake control
support, the proportional PTO support (if fitted on the cover plate),
remove the guide studs, Install and tighten the screws to a torque of
72-96 Nm. Position the control rod and adjust the hand brake mechanism.
Reinstall: right-hand hydraulic cover plate; intermediate shaft, the
driving gear and the top link support; linkage cover plate and the brake
pistons; left and right-hand trumpet housings; stabiliser supports;
hitch hook; wheels. Tighten to a torque of 400-450 Nm.
Reconnect the tractor between the gearbox and the rear axle. Top up the
oil level in the housings and check the level on the gauge located at
the back of the rear axle. Remove the safety chocks. Reinstall the body
(if removed). Start up. Bleed the main brakes and the trailer brake (if
fitted). Carry out a road test. Check the correct operation of the
controls and the electrical circuits. Check the tightness of the trumpet
housing mating faces on the housing, the cover plates and the hydraulic
unions.
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MF TRACTORS SPECIFICATIONS |
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MF FRONT END LOADERS |
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MF TRACTORS MAINTENANCE |
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MF TRACTORS TROUBLESHOOTING | ||||
1652 | 1749 | 2620 | 2725 | 2805 |
3050 | 3120 | 3640 | 3709 | 4245 |
4455 | 5320 | 5455 | 5613 | 6150 |
6280 | 6480 | 6615 | 7618 | 7720 |