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Massey Ferguson 6465, 6480, 6485 - Rear PTO
Massey Ferguson 6465, 6480, 6485 - Rear PTO operation
The housing installed to the rear of the GPA40 rear axle contains all
the rear mechanical power take-off components. These components rest on
the tapered roller bearings, the bearing cups of which are on the rear
PTO housing and its removable compartment and fitted freely and firmly
respectively.
Profile P of the 1000 rpm gear train teeth (driving and driven gears)
differs according to the type of tractor and the transmission equipment
fitted: Power Boost. The rear PTO is independent for MF 6465, 6480,
6485, 6490 tractor except for the Ground speed PTO version, which uses
the tractor's forward speed for operation. The Ground speed PTO is
fitted to tractors as an option.
The rear PTO can be divided into four sections:
1. Clutch - The clutch is located on the upper PTO shaftline and at the
front of the centre housing. It is supported by two ball bearings fitted
in a support mounted on the centre housing.
2. Upper shaftline - The upper shaftline of the rear PTO transmits the
engine speed to the driving gears located inside the rear housing of the
PTO via the clutch and a series of three shafts. The tapered roller
bearings supporting - the driving gear shaft are shimmed with a
clearance using shim(s) inserted between the front bearing cup and the
removable compartment.
3. Lower shaftline - The lower shaftline of the rear PTO is supported by
two tapered roller bearings fitted respectively in the rear PTO housing
and in the removable compartment. The tapered roller bearings are held
in position by a nut screwed onto the front end of the output shaft. The
preload shimming of the tapered roller bearings is carried out using
shim(s) inserted between the front bearing cup and the removable
compartment. The output shaft is sealed by a lip seal fitted into the
rear PTO housing. The output shaft is fitted with an interchangeable end
fitting which may be: of varying length; fitted with 6, 20 or 21
splines. The specifications of the output shaft depend on the type of
implement to be driven and on the rotational speed to be observed.
4. Power take-off brake - The rear PTO is fitted with a brake housed
inside the rear housing opposite the 1000 rpm driven gear. The rear PTO
brake gradually slows down the output shaft inertia until it stops
completely when the rear PTO clutch is disengaged. It is also used to
immobilise the gear trains (driving and driven gears) to prevent the
"drag" effect.
Massey Ferguson 6465, 6480, 6485 - Lubrication of the rear PTO
components
The clutch - The parts inside the rear PTO clutch are lubricated under
pressure via a pipe located above and in front of the centre housing.
The upper shaftline - An external pipe carries the lubrication oil under
pressure to the upper shaftline of the rear PTO. The flow of oil to the
driving gears and the tapered roller bearings is controlled by two
restrictors and an oil deflector located respectively in the rear
housing of the PTO (power take-off) and in the upper shaftline.
The lower shaftline - The lower shaftline of the rear PTO is supplied
with pressurised oil carried by a pipe to the front end of the output
shaft. This oil lubricates the rear bearing and the splines of the
output shaft driven gears.
The power take-off brake - The PTO brake is not lubricated under
pressure. Just the splashing of oil from the rear PTO housing is
sufficient to lubricate the friction washer, which is in contact with
the machined face of the 1000 rpm driven gear when the rear PTO (power
take-off) line is locked.
Massey Ferguson 6465, 6480, 6485 Rear PTO - Layout of the main components and
kinematics
MF 6465, 6480 Tractors installed with GTA1040 transmission
MF 6485, 6490 Tractors installed with GTA1540 transmission
The lower fixture of the rear PTO housing on MF 6485, 6490 tractors
installed with GTA1540 transmission is reinforced by fitting six 20 mm
diameter screws instead of the four 16 mm diameter screws used on MF
6465, 6480 tractors fitted with GTA1040 transmission.
Parts list: A - 540E control mechanism, B - Interlock
mechanism/adjustable sleeve assembly, C - 540-1000 rpm control
mechanism, D - Upper PTO shaftline, E - Lower PTO shaftline, F - Rear
housing of the PTO (power take-off), G - Ground Speed PTO shaftline (optional), H -
Smooth ring, I - Shouldered ring, J - Ground Speed PTO control mechanism
(optional), K - Interchangeable end fitting, L - Transmission oil level
gauge, M - Rear housing standard fixing (1040), M - Rear housing
reinforced fixing (1540), N - Removable compartment, O - Fixing for
linkage effort sensor, P - PTO brake mechanism and 1000 rpm driven gear,
Q - Pin, R - Restrictor D=1 mm
2-speed PTO with coupler control
Parts list: S - Power take-off driving shaft, T - 540 and 1000 rpm speed
selection coupler, U - Output shaft with interchangeable end fitting, V
- Driven gear train, W - Lubrication pipe, Z - Driving gear train
Kinematics
The 540 and 1000 rpm driving gears of the upper shaftline have spur cut
teeth and are constantly meshed with the respective 540-1000 rpm gears
of output shaft U. They drive the output shaft at a speed of 540 or 1000
rpm depending on the position of selection coupler T.
3-speed PTO with coupler control
Parts list: S - Power take-off driving shaft, T - 540 and 1000 rpm speed
selection coupler, U - Output shaft with interchangeable end fitting, V
- Driven gear train, W - Lubrication pipe, X - 540E selection coupler, Z
- Driving gear train
Kinematics
The 540-1000 rpm and 540E gears have spur cut teeth and are constantly
meshed with the respective 540-1000 rpm and 540E gears of output shaft
U. They drive the output shaft at a speed of 540-1000 rpm or 540E
depending on the position of selection couplers T and X. The 540E speed
is an economic ratio. It is obtained via an additional gear and a
coupler fitted to the front end of the driving gear train. When
selection coupler X is engaged, two interlock mechanisms joined by an
adjustable sleeve prevent selection coupler T from engaging. When a
coupler is engaged, the interlock mechanisms lock the passive coupler in
neutral at the control rod locking groove.
Ground Speed PTO with coupler control
Ground Speed PTO is fitted to tractors as an option.
Parts list: S - Power take-off driving shaft, T - Ground Speed PTO selection
coupler, U - Output shaft with interchangeable end fitting, V - Driven
gear (attached to gear Y by a screw), W - Lubrication pipe, Y - Driven
gear, Z - Driving gear
Kinematics
The Ground Speed PTO driving and driven gears have spur cut teeth and
are constantly meshed. They drive output shaft U at a speed proportional
to the tractor's forward speed when selection coupler T is moved to the
left. Ground Speed PTO is activated when the 540-1000 rpm PTO is deactivated.
The rotational movement of the Ground Speed PTO is transmitted via the
rear axle pinion (crown wheel and pinion) and a gear train 4 wheel drive
(4WD) at output shaft U via a driving shaft S and two gears Z and V.
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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 |