________________________________________________________________________________
Massey Ferguson 6465, 6480, 6485 - Rear axle pinion
Massey Ferguson 6465, 6480, 6485, 6490 -
Construction of rear axle pinion
The crownwheel and pinion, driven by the gearbox output shaft, drives
the rear axle. The helical pinion is supported by two tapered roller
bearings fitted opposite one another. The bearing cone (7) is force
fitted onto the pinion. The bearing cup (2) is fitted tightly into the
cover plate (13). The bearing cup (10) is fitted tightly into the hand
brake unit. The bearing cone (1), freely mounted on the pinion, allows
the fitting of shims (3) required for shimming. The pinion supports the
4WD drive gear (17). Its position can be adjusted using the shim(s) (12)
fitted between the centre housing compartment and the hand brake unit
(15). The preload on the tapered roller bearings is obtained using the
shim(s) (3) fitted between the bearing cone (1) and the thrust washer
(4).
On MF 6465, 6480 tractor the pinion fitting and adjusting principle is
the same for the three current types of differential: 5" hydromechanical
differential; 5" multidisc differential; 7" multidisc differential.
On MF 6485, 6490 tractor the pinion fitting and adjusting principle is
the same for the two current types of differential: 5" multidisc
differential; 7" multidisc differential.
Lubrication
The oil is directed via a pipe to the axial channel and the radial holes
of the pinion to lubricate the hand brake mechanism and the tapered
roller bearings. The pipe is connected to the hydraulic manifold located
above the centre housing.
Parts lists: (1) Bearing cone (2) Bearing cup (3)
Shim(s) (4) Thrust washer (5) Allen screws (6) Hand brake mechanism (7)
Bearing cone (8) Allen screw (9) Pinion (10) Bearing cup (11) Washer
(12) Shim(s) (13) Hand brake unit cover plate (14) Locating pin (15)
Hand brake unit (17) 4WD drive gear (18) Nut (45) Centre housing (62)
Lubrication pipe
1 - GTA1040 transmission (MF 6465, 6480), 2 - GTA1540 transmission (MF
6485, 6490), A - Details, B - Details, L - Lubrication
Massey Ferguson 6465, 6480, 6485, 6490 -
Removing and refitting the pinion/hand brake unit assembly, removing and
refitting the pinion
Disconnect the tractor between the gearbox and the rear axle. Remove the
right-hand hydraulic cover plate (LS 110 l/min hydraulics). Remove the
left-hand hydraulic cover plate (LS 110 l/min hydraulics). Remove the
rear power take-off clutch.
Remove the 4WD shaft and its clutch: Remove the creeper unit control
mechanism (if fitted). Remove the circlip (5) and the thrust washer (2).
Visually note the position of the shim(s) (6) and remove it/them. Remove
the 4WD gear (17), sliding it along the pinion.
Removing the pinion/hand brake unit assembly
The pinion/hand brake unit assembly must be removed in order to work
efficiently on the pinion. Loosen and immobilise the nut (18). Using
special socket, turn the pinion clockwise to unlock the nut without
unscrewing it completely. The nut is not removed completely until the
hand brake unit is on the workbench for stripping. Unscrew the eight M12
hexagonal head screws (8). Remove their washers (11). Unscrew the M20
screw (1) from the hand brake actuator lever.
Unscrew the two M12 Allen screws (5) that attach the hand brake unit
(15) to the centre housing compartment. Slide tool onto the pinion
splines. Moderately tighten the tool's three screws V in groove R of the
pinion.
Sling the tool using a makeshift handling bar and a suitable lifting
device. Carefully pull the pinion/hand brake unit assembly forwards and
release it from the centre housing.
Recover the shims (12) (internal diameter approx. 175 mm) on the hand
brake unit assembly. The shims inserted between the hand brake unit and
the centre housing compartment are used for adjusting the taper
distance. Separate the sling and tool from the pinion/hand brake unit
assembly.
Massey Ferguson 6465, 6480, 6485, 6490 -
Disassembling the pinion
Place the pinion/hand brake unit assembly vertically on the workbench.
Completely unscrew the nut (18) and discard it. Remove: tapered roller
bearing cone (1); shim(s) (3); thrust washer (4), marking its position.
Remove the cover plate (13) and the hand brake mechanism (6). Remove the
pinion, separating it from the hand brake unit (15). If necessary,
extract the tapered roller bearing cone (7) from the pinion. Remove:
bearing cup (2) from the cover plate (13), locating pin (14) from the
hand brake unit (15).
Reassembling the pinion
The shimming with preload on the pinion's tapered roller bearings and
the adjustment of the pinion/hand brake unit assembly position must be
checked after one or more of the following parts are replaced: centre
housing; pinion; head bearing (tapered bearing cone (7) and the cup
(10)); hand brake unit (15); unit cover plate (13); end bearing (tapered
bearing cone (1) and cup (2)). Clean and check all components. Replace
those that are defective.
If disassembled, use a press and a suitable fixture to fit the tapered
roller bearing cone (7) against the pinion shoulder. Fit the tapered
roller bearing cone (10) against the shoulder of the hand brake unit.
Check that the elements are properly supported by their respective
bases. Place the hand brake unit (15) vertically on the workbench,
having fitted the pinion beforehand. Reassemble the hand brake mechanism
inside the unit (15). Fit the tapered roller bearing cup (2) against the
cover plate shoulder (13). Fit the cover plate (13) after checking that
the locating pin (14) is present.
On the pinion, slide the thrust washer (4) against shoulder E together
with the shim(s) (3) used to preload the tapered roller bearings. The
shim(s) (3) required for shimming by preloading the tapered roller
bearings (1) (2) and (7) (10) must be inserted between the thrust washer
(4) and the tapered roller bearing cone (1). Fit the tapered roller
bearing cone (1) after lubricating the cone with clean transmission oil.
Tighten the new nut (18) without locking it. If necessary, carry out the
shimming with preload on the pinion tapered roller bearings and the
adjustment of the position of the pinion/hand brake unit assembly. The
new nut (18) will be definitively locked when the pinion/hand brake unit
assembly (15) is refitted to the centre housing.
MF 6465, 6480, 6485, 6490 - Refitting the
pinion/hand brake unit assembly
Clean and check all components. Replace those that are defective.
Position the shim(s) (12) on the fitting area of the hand brake unit
(15). Refit the pinion/hand brake unit assembly against face F of the
centre housing compartment. During the refitting process, refit the hand
brake actuator lever at the same time.
Press the hand brake unit towards the centre housing compartment, in
preparation for fitting. Align the three fixing holes on the hand brake
unit with the compartment holes by screwing a guide stud into a tapped
hole located at the top of the centre housing. Clean the thread of the
screws (5) (8) and lightly smear with Loctite 242 or equivalent. Screw
in the Allen screws (5). Screw in the hexagonal head screws (8) fitted
with their washers (11) while removing the guide stud at the same time.
Tighten the diametrically opposed screws (5) (8) uniformly and
step-by-step to a tightening torque of 100-130 Nm. This tightening
method ensures that the hand brake unit (15) is fitted gradually and
smoothly into the centre housing compartment and that the shim(s) (12)
are applied appropriately. Adjust the hand brake mechanism. Degrease the
threads of the new nut (18) and the pinion. Lightly smear the thread of
the nut with Loctite 270 or equivalent. Lock the nut. Using socket ref.
3378119 M1, turn the pinion anti-clockwise to a tightening torque of
200-250 Nm. Ensure that the torque wrench is properly positioned in
order to obtain the correct tightening torque for the nut. Remove tools.
Using a suitable punch, lock the nut by bending its collar, without
breaking it, into the three pinion grooves. Slide the 4WD gear (17) over
the pinion splines. Fit the following, observing the correct fitting
order: shim(s) (6) then thrust washer (2) then circlip (5). Check the
axial clearance of the 4WD gear (17): it should be between 0 and 0.55
mm. As far as possible, shim to the minimum tolerance. Refit: left-hand
hydraulic cover plate (LS 110 l/min equipment); right-hand hydraulic
cover plate (LS 110 l/min equipment); creeper unit control mechanism (if
fitted); 4WD clutch and its shaft; power take-off clutch. Reconnect the
tractor between the gearbox and the rear axle.
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
MF TRACTORS SPECIFICATIONS |
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
MF FRONT END LOADERS |
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
MF TRACTORS MAINTENANCE |
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
________________________________________________________________________________________
MF TRACTORS TROUBLESHOOTING | ||||
1652 | 1749 | 2620 | 2725 | 2805 |
3050 | 3120 | 3640 | 3709 | 4245 |
4455 | 5320 | 5455 | 5613 | 6150 |
6280 | 6480 | 6615 | 7618 | 7720 |