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Massey Ferguson 5465, 6465, 6475, 6485 - Carraro differential unit
Massey Ferguson 5465, 6465, 6475, 6485 -
Carraro front axle differential unit reassembly
Mount the new tapered roller bearings on the half-bearings. Position one
of the half bearings on a workbench and install the internal parts
(thrust washer, sun gear, planet gears, spider) as shown in the figure.
Insert the pin into its housing, holding the planet gears and spider
correctly in place. Lock the pin by inserting the locating dowel in the
hole provided on the bearing and pin. Turn the pin manually to align the
hole of the dowel with that of the bearing. Definitively position the
locating dowel.
Position all the internal parts in the bearing: planet gears, discs and
counter-discs. Install new "O" rings in the seatings provided on the
piston and on the differential cover plate. Insert the piston and fit
the cover plate in the differential housing. Apply a film of Loctite 476
between the bevel ring gear and the differential housing surface.
Position the bevel ring gear on the cover plate, apply Loctite 270 to
the threads and attach the assembly, tightening the screws to a torque
of 70 Nm.
Massey Ferguson 5465, 6465, 6475, 6485 -
Install the differential housing assembly
Install the external tapered roller bearing cups on the two differential
bearings and install the washer and spacer on the crownwheel and pinion
side with new seals, previously smeared with a thin layer of grease.
Before positioning the differential unit in the differential housing,
install a new seal B and washer A at the bearing base on the bevel ring
gear side, over the oil hydraulic port. Install the unit assembly on the
differential housing. Take care not to invert the external cups of the
tapered roller bearings and ensure that the bevel ring gear assembly is
fitted on the correct side.
Move the differential assembly so that the bevel ring gear can be
positioned on the pinion. Ensure that all rings E are in position in
their seatings and place both half-bearings D on their seats, following
the marks made during disassembly. Lock the two half-bearings with their
screws C.
Assemble and tighten the two adjustment nuts in the differential housing
to eliminate the backlash and slightly preload the differential
bearings. As the two nuts are different, take care to return them to
their original positions relative to the bevel ring gear. Check that the
bearings are correctly mounted in their seats, and, if necessary, tap
them gently with a rubber hammer to secure them in place.
Place a dial gauge with a magnetic stand on the differential housing and
move the dial gauge feeler pin until it comes into contact with a ring
gear tooth at a 90 deg angle. Lock the pinion and move the ring gear
alternately to the right and left, using the dial gauge to measure the
backlash between the pinion and the ring gear. Repeat the operation on
at least two teeth, turning the ring gear, to calculate an average
value. Check that the measured backlash value is within the permissible
tolerances: 0.18 to 0.23 mm. Fine-tune the shimming by adjusting the two
nuts.
When tightening nuts, always remember that: if the measured backlash is
lower than the permissible tolerance, the nut on the bevel ring gear
side must be loosened and the opposite screw must be screwed to the same
value. If the measured backlash is higher than the permissible
tolerance, the nut on the side opposite the bevel ring gear side must be
loosened and the screw on the other side must be screwed to the same
value. When the backlash between the pinion and ring gear has been
adjusted, check that the bearing preload of the differential unit is
minimal. Repeat the sequence of steps described above until the required
conditions are met.
Once the correct backlash has been obtained between the pinion and ring
gear, measure the total bearing torque T (pinion-bevel ring gear
system). The measured value must remain within the following limits: T=
(P+1.82) to (P+2.12) N.m where P represents the actual measured pinion
torque. All torques must be measured without the seal. If the measured
value is outside the permissible tolerances, check the assembly of each
part carefully and adjust the differential housing adjustment nuts: if
the total torque is lower than the permissible values, tighten both nuts
identically without modifying the backlash between the pinion and ring
gear. If the total torque is higher than the permissible values, loosen
both nuts identically without modifying the backlash between the pinion
and ring gear.
To test the marking of the crownwheel and pinion teeth, apply a tiny
amount of paint to the ring gear. This marking test must be carried out
systematically on the bevel ring gear teeth and on each face. OK =
Correct contact.
If the crownwheel and pinion are adjusted correctly, a uniform layer of
paint is left on the surfaces of the teeth: Z: Excessive contact at the
tip of the teeth. Move the pinion closer to the ring gear then move the
ring gear away to correct the backlash. X: Excessive contact at the base
of the teeth. Move the pinion away from the ring gear, then move the
ring gear closer to correct the backlash. Corrective action: Move the
pinion in the direction of the arrow to adjust an X type contact. Move
the pinion in the direction of the arrow to adjust a Z type contact.
When the shimming procedure is complete, Install the nut retainers with
their screws and tighten to the required torque (13 Nm) using a torque
wrench. The nut and its corresponding counter-nut are different on the
ring gear side and the opposite side of the differential unit; turn the
nuts slightly to align them with their retainers.
Tighten the screws of the two half-bearings with a torque wrench to the
required torque (266 Nm). Before bringing two surfaces into contact,
ensure that both are perfectly clean. Degrease and clean them with
suitable cleaning products. Apply a thin film of Loctite 510 to the
mating surface between the axle beam and the differential housing.
Install the differential housing on the axle housing and screw to the
required torque (169 Nm). Install a new previously lubricated seal C on
the end of the pinion then install the flange A. Position the flange
screws B with their respective nuts. Tighten the screws and nuts with a
torque wrench to the required torque (57 Nm).
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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 |