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Massey Ferguson 6465, 6480, 6485 Rear axle - Trumpet housing assembly
The Normal Duty (ND) trumpet housings on MF 6465, 6480, 6485, 6490
tractors fitted with GTA-1040 or GTA-1540 transmission support the right
and left-hand axle shafts. They contain the final drive units that
transmit the rotation from the differential assembly. Tractors fitted
with GTA-1540 transmission may be fitted with trumpet housings with a
flanged axle shaft or straight axle shaft. The two trumpet housings are
symmetrical. They are fitted either side of the centre housing.
Massey Ferguson 6465, 6480, 6485 -
Construction of trumpet housing assembly
The axle shaft (2) is supported by two tapered roller bearings (7) (8)
and (12) (13) fitted opposite one another. External tightness is ensured
via a three-lipped seal (5) and internal tightness by a single lip seal
(11). The planet carrier assembly of the final drive unit (25) has three
planet gears (22). It is splined to the axle shaft (2) in rotation. The
shims (26) fitted at the end of the shaft allow for preloading of the
tapered roller bearings. The final drive ring gear (15) is force fitted
into the trumpet housing. It has five pins (14),which ensure the
centring of the brake plate (30). Differential rotation is transmitted
to the planet gears of the final drive via a sun gear shaft (29) on the
teeth of which the brake disc (35) is fitted. The brakes are lubricated
via a port O drilled in the trumpet housing.
On MF 6485, 6490 tractors fitted with GTA-1540 transmission, the axle
shaft (2) and planet carrier (25) are held in place by the tripod washer
(27), the M20 screw (28) and the lock washer.
On MF 6465, 6480 tractors fitted with GTA-1040 transmission, the axle
shaft (2) and the planet carrier (25) are held in place by the tripod
washer (27) and the M20 screw (28) smeared with Loctite.
Parts list (MF 6465, 6480 Tractors fitted with GTA1040
transmission) - (2) Flanged axle shaft (5) Three-lipped seal
(6) Friction cage (7) Bearing cone (8) Bearing cup (9) Threaded plug
(10) Trumpet housing (11) Single lip seal (12) Bearing cup (13) Bearing
cone (14) Pins (15) Ring gear (16) Tab washer (17) Spacer (18) Screw
(19) Circlip (20) Planet gear pins (21) Washers (22) Planet gears (23)
Needle rollers (24) Spacers (25) Planet carrier (26) Shim(s) (27) Tripod
washer (28) M20 screw (29) Sun gear (30) Brake plate (35) Brake disc
(36) Wheel stud (39) Screw (40) Dowel (44) M16 stud, washers and nuts
A - Grease chamber, B - Details, D - Silicone seal, E - Imprint on
planet gears, O - Brake lubricating port
Parts list (MF 6485, 6490 Tractors fitted with GTA1540
transmission) - (1) Lock washer (2) Straight axle shaft (2)
Flanged axle shaft (3) HNBR seal (5) Three-lipped seal (6) Friction cage
(7) Bearing cone (8) Bearing cup (9) Threaded plug (10) Trumpet housing
(11) Single lip seal (12) Bearing cup (13) Bearing cone (14) Pins (15)
Ring gear (16) Tab washer(17) Spacer (18) Screw (19) Circlip (20) Planet
gear pins (21) Washers (22) Planet gears (23) Needle rollers (24)
Spacers (25) Planet carrier (26) Shim(s) (27) Tripod washer (28) M20
screw (29) Sun gear (30) Brake plate (35) Brake disc (36) Wheel stud
(39) Screw (40) Dowel (44) M16 stud, washers and nuts
A - Grease chamber, E - Imprint on planet gears, O - Brake lubricating
port
Massey Ferguson 6465, 6480, 6485 - Removing
and refitting the trumpet housing assembly
GTA1040
GTA1540
Removal
Drain the centre housing. Immobilise the tractor. If the tractor is not
fitted with a ParkLock device, engage the hand brake. Chock between the
frame and the front axle. Remove the wheel concerned. Place an axle
stand in position. Visually anticipate the separation of the trumpet
housing from the centre housing, checking that the trumpet housing and
cab will not obstruct each other. If this is not the case, proceed as
follows: Unscrew the cab attachment screws on the trumpet housing
support. Raise the rear of the cab slightly until the trumpet housing
separates from the centre housing. Chock the cab.
Remove: the stabilising support; the lower pivot pin of the lift ram. If
necessary, remove the guard (draft sensor harness) from the trumpet
housing. Support the trumpet housing with a suitable fixture and a
trolley jack or a hydraulic table.
Remove: the screws (39); the nuts screwed to the M16 studs (44); the
washers. Split the trumpet housing assembly from the centre housing.
Remove: the brake disc (35); the sun gear (29); the dowel (40) (if
necessary); the brake plate (30).
Refitting
Massey Ferguson 6465, 6480 Tractors - Clean the mating faces of the
trumpet housing and centre housing with solvent. Remove all traces of
the previous sealing product. Dry the components. Evenly smear the
mating face of the trumpet housing (10) against the centre housing with
a sealing product (Loctite 5206 or equivalent).
Evenly fill angle D of the centre housing (1) with a silicone seal
(Loctite 5910 or equivalent). The diameter of the seal must be: uniform;
of small section. The seal must not have gaps. The join must be located
at the top of the centre housing. On the trumpet housing, refit the
brake plate (30), applying three spots of miscible grease to ensure that
it sticks to the ring gear (15). On the centre housing, refit the dowel
(if removed). On the trumpet housing or the centre housing (as
required), refit the sun gear (29) and the brake disc (35). Ensure that
the latter slides freely on the sun gear splines.
Massey Ferguson 6485, 6490 Tractors - Clean the mating faces of the
trumpet housing and centre housing with solvent. Check that the groove
of the seal on the centre housing is free of dirt. Dry the components.
Fit a new HNBR seal (3) to service tool. The HNBR seal (3) has no spurs
P. Do not confuse it with the NBR seal (4). These two seals are not
exposed to the same temperatures when the transmission is operating
(e.g. the HNBR seal (3) is exposed to higher temperatures when the brake
is engaged). Their components are therefore different and they must be
fitted correctly in their respective positions. Attach the tool fitted
with the HNBR seal (3) to the centre housing. Manually exert high
pressure around the tool while simultaneously turning it so that the
seal fits correctly into the groove of the centre housing (1). It is
strongly recommended that the HNBR seal (3) is fitted using the service
tool.
Fitting it without the tool will stretch the seal and cause a loop to
form in the final assembly phase. Remove the service tool. Ensure the
HNBR seal (3) is positioned correctly on the centre housing. Apply three
spots of miscible grease to the relevant mating face of the brake plate
(30) and stick the plate against the ring gear (15) of the trumpet
housing. The brake plates (30) on tractors fitted with GTA 1540
transmission (50 kph) have a notch E, which must be positioned facing
upwards.
MF 6485, 6490 Tractors fitted with GTA1540 transmission (50 kph) are
assisted by a return travel limit mechanism on the brake pistons. As a
result, before replacing the brake plates (30), it is advisable to push
the brake pistons fully into their cavity so that this return travel
limit mechanism once again returns the brake pistons correctly after the
operation. On the centre housing, refit the dowel (if removed).
On the trumpet housing or the centre housing (as required), refit the
sun gear (29) and the brake disc (35). Ensure that the latter slides
freely on the sun gear splines. Tractors fitted with GTA1540
transmission (50 kph) are assisted by a return travel limit mechanism on
the brake pistons. As a result, before replacing the brake discs (35),
it is advisable to push the brake pistons fully into their cavity so
that this return travel limit mechanism once again returns the brake
pistons correctly after the operation.
Tractors fitted with GTA1040 or GTA1540 transmission - Support the
trumpet housing using the equipment used for removal. Engage the splines
of the sun gear (29) in the differential or planet carrier (as
required). If they do not engage, rotate the axle shaft and push the
trumpet housing horizontally to couple it with the centre housing.
Tighten: M16 screws (39) to 220-300 Nm; M16 nuts (44) to 220-280 Nm. If
required, refit the guard (draft sensor harness). Refit: lower pivot pin
of the lift ram; stabilising support. If it was necessary to lift the
cab, reposition it on the trumpet housing support(s). Screw in the cab
attachment screws.
Refit any parts removed from around the trumpet housing. Refit the
wheel. Tighten the screws and nuts to their indicated torque, depending
on the version. Top up the centre housing oil level. Check it using the
sight glass located to the left of the PTO housing. Remove the shims
between the frame and the front axle. Check the linkage operation. Carry
out a road test on the brake system. Check the tightness of the trumpet
housing, the hydraulic unions and the plugs.
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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 |