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Massey Ferguson 5445, 5455, 5465 - Rear axle
MF 5435, 5445, 5455, 5460, 5465, 5470, 5475 tractor rear axle comprises four main housings: the centre housing which contains the crow nwheel and pinion, the power take-off transmission in all variants as well as the 4-wheel drive tractor transmission, the hand brake control mechanism and the main brakes.
It also supports the two trumpet housings, the linkage cover plate, and
the side cover plates. The right and left-hand trumpet housings fixed to
each side of the centre housing, acting as a housing for the rear wheel
drive system. The linkage cover plate fitted to the top of the centre
housing supports the linkage arms, which are connected to the tractor
hitch.
Massey Ferguson 5435, 5445, 5455, 5460, 5465,
5470, 5475 Rear axle - Centre housing assembly
Differential
The pinion is driven by the gearbox output shaft, attached to the
connecting shaft by splined sleeves. The helical crown wheel and pinion
assembly transmits the drive to the trumpet final drive units. A
differential lock system with a dog clutch and activated by hydraulic
pressure is incorporated into the unit. The differential lock is
controlled either by the Autotronic 5 for models fitted with a Power
Shuttle, or by an electrical circuit for models fitted with a mechanical
reverse shuttle.
4-wheel drive clutch
A driving gear attached to the pinion drives the counter driven gear of
the 4WD clutch assembly. Drive is then transmitted via the Belleville
washers to the clutch output shaft. The 4WD clutch is hydraulically
activated. There is therefore no possibility of accidental disengagement
of the 4WD clutch in the event of hydraulic failure.
Power take-off drive line
The rotation of the shaft passing through the gearbox, proportional to
engine speed, is transmitted to the hydraulic clutch located at the
front of the centre housing. In the clutch engaged position, drive is
transmitted by an intermediate shaft and a set of driving and driven
gears to the 540 or 1000 rpm PTO shaft. Speeds are selected by a system
of interchangeable shafts or by shifting. A hydraulic brake mechanism
stops the rotation of the PTO shaft in the disengaged position. Two
additional options are offered: 4 speed economy PTO, Ground Speed PTO.
MF 5435, 5445, 5455, 5460, 5465, 5470, 5475
Rear axle - Hand brake assembly
A brake assembly comprising three discs and an expanding mechanism is
fitted to the pinion.
Main brakes
Two pistons fitted laterally into two cavities in the centre housing act
on two discs attached to the trumpet housing input sun gears. The brake
pistons are activated hydraulically.
J - Clearance, P - Preload, E - Taper distance, Z - Nominal dimension of
the pinion = 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
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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 |