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Massey Ferguson 6465, 6480, 6485 - Rear PTO output shaft and brake
On MF 6465, 6480, 6485, 6490 tractors equipped with GTA1040 or GTA1540
transmission, the rear PTO may be installed with a 540E economy version.
The economy version follows the principle of the 540-1000 rpm standard
equipment and is produced by fitting an additional 540E gear (10)
centred and fitted to the 540 rpm gear (7) via a screw (11). The profile
of the 1000 rpm driven gear differs according to the transmission type
and equipment installed.
The profile of the 1000 rpm driving gear also differs according to the
transmission type and equipment fitted. Regardless of the type of PTO,
the driven gears are constantly meshed with the driving gears driven by
the upper shaftline. The output shaft (13) is fitted on tapered roller
bearings (3) (8) and (19) (21) mounted respectively in the rear PTO
housing and in the removable front support (12).
The 540-1000 rpm gears (7) (18) are splined to the output shaft and
clamped between the bearing cones by the nut (2). The rear bearing is
sealed by the seal (14). The preload of the tapered roller bearings is
adjusted by using the shims (23) inserted between the removable front
support (12) and the bearing cup (19). Sensor C (if fitted) located to
the right of the PTO housing informs the tractor's electronic system of
the speed of the output shaft via the 540 rpm driven gear. A threaded
plug C blocks the sensor port if the sensor is not fitted.
The rear PTO brake is a cylindrical piston (25) fitted with an "O" ring
(17). This piston is housed in a bore of the rear PTO housing. When the
PTO clutch supply is interrupted, the 17 or 21 bar pressure is applied
to the brake. The piston then travels towards the machined face of the
1000 rpm driven gear (18) and compresses this gear via a friction washer
(26) in order to gradually slow down the rotation of the mechanical
sections of the PTO until they are completely immobilised.
Massey Ferguson 6465, 6480, 6485, 6490 - PTO
Lubrication
The lower shaftline of the PTO is lubricated by a pipe (5) which carries
transmission oil to the axial port and the radial holes in the output
shaft (13). The oil lubricates the splines on the 540-1000 rpm gears and
the rear bearing (8) (21). The front bearing (3) (19) is lubricated by
oil splashing from the gears as they move.
Parts list: (1) Screw (2) Undercut nut (3) Bearing cone
(4) Long or short flanged shaft (interchangeable shaft) (5) Lubrication
pipe (6) Screw (7) 540 rpm driven gear (8) Bearing cone (9) Guard (10)
540 E driven gear (11) Screw (12) Removable front support (13) Output
shaft (14) Seal (18) 1000 rpm driven gear (19) Bearing cup (21) Bearing
cup (23) Shims (24) "O" ring, A - Details 540-1000 rpm PTO/ 540E PTO
MF 6465, 6480, 6485, 6490 - Disassembling and
reassembling the 540-1000 PTO
Disconnect the PTO housing from the centre housing. All operations on
the PTO lower shaftline, including removal of the rear bearing gasket,
involves removing and install the PTO housing. Only the flanged shaft
(4) can be disassembled without having to carry out this removal
operation. Remove the sensor (if fitted) located to the right of the
rear housing of the PTO. Remove the 540-1000 rpm (2-speed) or 540E
(3-speed) PTO selection mechanism and the front removable support (12).
Disassembling the 540-1000 rpm driven gears
Immobilise the output shaft (13) by inserting a locally obtained M16
screw into hole T located between the rim of the output shaft and the
rear housing of the PTO. Unlock the nut (2) and loosen it using a
standard socket (55 mm flat). Extract the bearing cone (3). Remove the
540-1000 rpm driven gears (7) (18) from the rear housing of the PTO.
Using a soft hammer, tap the inside end of the output shaft and drive
the output shaft outwards. Recover the bearing cone (8). Drive out the
bearing cup (21). Drive out the seal (14) from the rear housing of the
PTO. Discard it.
Reassembling the 540-1000 rpm driven gears
Correctly position the new seal (14) in the rear housing of the PTO.
Using tool, gradually Install the new seal at a distance of 240 mm from
the face of the rear housing of the PTO. Install the bearing cup (21).
Lubricate the mating face of the seal (14) on the output shaft with
clean transmission oil. Engage the output shaft in the port on the rear
housing of the PTO. Install the bearing cone (8) on the output shaft
using a suitable locally obtained fitting drift. If necessary, shim the
tapered roller bearings (3) (19) and (8) (21).
Reinstall: driving gears;
540-1000 rpm driven gears (7) (18). Using a suitable fixture, Install
the bearing cone (3). Clean the threads of the new screw (2) and the
output shaft (13). Lightly smear the thread of the nut with Loctite 270
or equivalent. Screw this nut onto the output shaft. Immobilise the
output shaft. Definitively tighten the nut to 160-240 Nm. Using a
suitable punch, lock the nut in place by bending the collar into the
grooves of the output shaft without breaking it.
Massey Ferguson 6465, 6480, 6485, 6490 - Disassembly and reassembly the
540E PTO
Disassembling the 540E driven gears
Immobilise the output shaft (13) by inserting a locally obtained M16
screw into hole T located between the rim of the output shaft and the
rear housing of the PTO. Unlock the nut (2) and loosen it using a
standard socket (55 mm flat). Extract the bearing cone (3). Remove the
540E driven gears (7) (10) from the rear housing of the rear PTO. Turn
the 540E gear set over in order to access the screw heads (11). Then
slide the overturned 540E gear set onto the output shaft (13).
Immobilise the output shaft. Unscrew the screws (11). Remove the 540E
gear set from the rear housing of the PTO again and separate it. Using a
soft hammer, tap the inside end of the output shaft and drive the output
shaft outwards. Recover the bearing cone (8). Drive out the bearing cup
(21). Drive out the seal (14) from the rear housing of the PTO. Discard
it.
Reassembling the 540E driven gears
Correctly position the new seal (14) in the rear housing of the PTO.
Using tool, gradually Install the new seal at a distance of 240 mm from
the face of the rear housing of the PTO. Install the bearing cup (21).
Lubricate the mating face of the seal (14) on the output shaft with
clean transmission oil. Engage the output shaft in the port on the rear
housing of the PTO. Install the bearing cone (8) on the output shaft
using a suitable locally obtained fitting drift. Clean the tapped holes
on the gear (10) and the screw (11) threads. Reassemble the 540E gear
set (7) (10). Lightly smear the thread of the screws (11) with Loctite
270 or equivalent. Screw in and tighten these screws to 110-140 Nm.
If necessary, shim the tapered roller bearings (3) (19) and (8) (21).
Reinstall: driving gears; 540E driven gears. Using a suitable fixture,
fit the bearing cone (3). Clean the threads of the new screw (2) and the
output shaft (13). Lightly smear the thread of the nut with Loctite 270
or equivalent. Screw this nut onto the output shaft. Immobilise the
output shaft. Definitively tighten the nut to 160-240 Nm. Using a
suitable punch, lock the nut in place by bending the collar into the
grooves of the output shaft without breaking it.
Install the 540-1000 rpm (2-speed) or 540E (3-speed) PTO mechanism and
the front removable support (12). If necessary and depending on the
option, Install the sensor located to the right of the rear PTO housing.
During the refitting process: lightly smear the sensor thread with
Loctite Form A Gasket 2 or equivalent; tighten home the sensor, without
forcing, until its end is positioned against the gear (7), unscrew the
sensor by three quarters of a turn; moderately tighten the nut.
Reconnect the PTO housing to the centre housing. Start the tractor
engine and check the PTO operation.
MF 6465, 6480, 6485, 6490 PTO - Shimming the output shaft
540-1000 rpm PTO
540E PTO
Preparation for shimming - Temporarily reassemble the lower PTO
shaftline in the rear housing with the output shaft (13), the lubricated
bearings and the driven gears. To reduce the inertia caused by the gears
during the alternating movement (right/left) from the output shaft
during the shimming operation, it is advisable to temporarily remove the
driving gears from the upper shaftline. Tighten the nut (2) to 160-240
Nm without Loctite. In space E of the removable front support (12),
slide a shim (23) thickness reduced from 0.15 to a maximum of 0.20 mm in
relation to the thickness found during disassembly. Install the bearing
cup (19). Temporarily fix the removable front support (12) to the rear
housing of the PTO. Tighten a few opposing V screws to 68-92 Nm.
Shimming
If necessary, to obtain a smooth area for the dial gauge feeler pin
contact, gently surface the rear end of the output shaft (13) using an
oilstone. Install the dial gauge feeler pin to the end of the output
shaft. Push firmly on the output shaft, turning it alternately to the
right and left in order to correctly fit the cones in the bearing cups.
Set the dial gauge to zero. According to the temporary clearance reading
measured on the dial gauge, determine another shim (23) thickness to
obtain a preload P1 = 0 to 0.10 mm. As far as possible, shim to the
maximum tolerance.
Massey Ferguson 6465, 6480, 6485, 6490 - Disassembling and reassembling
the rear PTO brake
Remove the 540-1000 rpm or 540E driven gears (depending on version).
Remove the friction washer (26) (bi-metal). Using a jet of compressed
air, carefully drive out the brake piston (25) from the rear housing of
the PTO. Remove the "O" ring (27). Discard it. Clean the hydraulic
chamber of the brake piston (25). Check that there is no dirt inside the
17 or 21 bar channel. Install a new "O" ring (17) in the brake piston
(25) groove.
Install the brake piston fitted with its "O" ring in the rear housing of
the PTO, positioning its chamfered edge towards the hydraulic chamber.
The chamfer provides a correct hydraulic supply to the brake piston.
Refit the friction washer (26) (bi-metal) to the brake piston,
positioning its ribbed face towards the driven gear (18). The
lubrication between the brake piston and the friction washer is provided
by splashing caused by the moving parts. Reinstall the 540-1000 rpm or
540E driven gears (depending on version).
MF 6465, 6480, 6485, 6490 - Replacing the interchangeable shaft or
flanged shaft
If it is necessary to remove and reinstall the interchangeable shaft
(4), proceed as follows. Immobilise the output shaft (13) by inserting a
locally obtained V M16 screw in hole T. Unscrew the screws (6). Remove
the interchangeable shaft (4). Check that the dowel (28) is present.
Install the interchangeable shaft. Screw in the screws. Tighten to a
torque of 120-140 Nm, immobilising the output shaft (13).
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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 |