Specifications, Service and Repair of Farm and Lawn Tractors

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Massey Ferguson 5445, 5465, 5470 - Rear axle differential

The crown wheel and pinion, driven by the gearbox output shaft, drives the rear axle. The helical pinion is supported on either side of its teeth by two tapered roller bearings fitted in opposition. Lubrication of the bearing (30) (37) is ensured by a flow of transmission oil from the PTO top cover plate located at the rear of the MF 5435, 5445, 5455, 5460, 5465, 5470, 5475 tractor. The bearing cones are force fitted to the pinion and the rear cup, smeared with Loctite 603, is also force fitted in the rear axle housing. The front cup is free in its bore to allow for shimming of the pinion.

The ring gear is fixed to the differential unit by rivets. The differential assembly turns on two tapered roller bearings supported by two lateral flanges centred by rings and screwed to the rear axle housing. The differential assembly comprises two half-units holding two planet gears for models up to 75 hp and four planet gears for models whose power output exceeds 75 hp. The unit also holds two sun gears. The pinion is fitted in the rear axle housing.

The crown wheel and pinion is adjusted using shims fitted between the centre housing and the bearing cup (37). The pre-loading of the tapered roller bearings (31) (33) and (30) (37) is obtained by shim(s) placed between the hand brake plate and the centre housing. The pre-load shimming of the differential assembly is carried out by deflectors (13) of different thicknesses fitted behind the left-hand bearing cup (14). If needed, an additional shim (49) can be fitted between flange (9) and the deflector.

Massey Ferguson 5435, 5445, 5455, 5460, 5465, 5470, 5475 - Removing the differential assembly

Disconnect the tractor between the gearbox and the rear axle (the cab remains attached to the gearbox). Remove the wheels. Separate the left and right-hand trumpet housings from the centre housing. Remove the linkage cover plate. Remove the hitch hook support. Remove the PTO top cover plate, the driving gear and the intermediate shaft. Take off the pipe (40).

Remove the brake pistons. Carefully fit a sling to the differential assembly using a clamp. Before working on the screws (56) and the nut (42). Loosen the screws (56) and the nut (42) alternately to gradually release the spring (6). Remove flange (9), the spring (6), the dog clutch (7) and the washer (11). Remove the screws (26). Remove the flange (25). Take out the differential assembly from the centre housing.

MF 5435, 5445, 5455, 5460, 5465, 5470, 5475 - Disassembling the differential assembly and the ring gear

Disassembling the differential assembly

Place the differential assembly on a workbench. Extract the cones (17) (28) and cup (27), recover shims (38). Mark the two half-units (29) with two joining paint lines. Remove the screws (15). Remove the fixed dog clutch (16). Separate the two half-units (29).



Remove the washers (18), the sun gears (19), the planet gears (20), the washers (21) and the spider (22). If the ring gear is replaced, the pinion must also be replaced. These components both bear the same number. They must be fitted as pairs. The ring gear and unit are originally assembled using rivets. During repairs, these rivets are replaced by screws and nuts.

Disassembling the ring gear

Remove the ring gear from the unit. Centre punch each rivet (24) (on the toothed side of the ring gear). Using a 5 mm drill bit, drill the rivets to a depth of 10 mm. Carry out a second drilling operation with a 12 mm drill to the same depth. Drive out the rivets using a suitable pin punch.

Removing and disassembling the pinion



Remove: right and left-hand hydraulic cover plate assembly; circlip (1); gear (2) (if fitted); hand brake mechanism assembly; screws (32), the thrust plate (35) and the shims (36); cup (33) and the pinion complete with cones (30) and (31); lubrication pipe (47). Remove and discard the plug (41), extract the cup (37) and recover the shims (50). Disassembling the pinion - Extract the cones (30) (31).

Massey Ferguson 5435, 5445, 5455, 5460, 5465, 5470, 5475 - Reassembling the ring gear and the differential assembly

Reassembling the ring gear

Check that the ring gear and pinion bear the same number. Clean the mating faces of the new ring gear (23) and the unit (29) and the nuts and screws referenced in the spare parts catalogue.



Smear the first threads of the screws (1) with Loctite 270 and place them in the ring gear and unit. Tighten and lock the nuts (2) to a torque of 150-160 Nm.



MF 5435, 5445, 5455, 5460, 5465, 5470, 5475 - Reassembling the differential assembly

Check the components and replace those that are defective. Reassemble the differential assembly. Smear the screws (15) with Loctite 270 then tighten to a torque of 85-130 Nm. The clearance "J1" between the planet gears and the sun gears must be between 0.08 and 0.30 mm. Insert the cones (17) (28) respectively in the bottom of the shoulder of the fixed dog clutch (16) and the right-hand flange (25), using a press and a suitable fixture. Place shim(s) (38) in the half-unit (29) to pre-adjust the backlash and then Install the cup (27).

Adjusting the taper distance

Check the components and replace those that are defective. Using a press and a suitable fixture, Install the cone (30) fully onto the pinion shoulder.



The taper distance must be adjusted before the pre-load shimming of the pinion bearings. The thickness of shims "E" (50) required to position the pinion is calculated according to the formula below: E = Z + T - (X + Y). E = 184.955 + T - (X +90.520).



Z - Nominal pinion dimension = 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 mm.

Reinstall

Using a press and a suitable fixture, Install the bearing cone (31) fully onto the pinion shoulder. Install the shims (50), their thickness determined by the above formula. Lightly smear the external surface of the cup (37) with Loctite 603 or equivalent and Install it to make contact with the shims (50) using a suitable fixture. Eliminate all traces of Loctite. The cones and cups must be cleaned and lubricated after fitting. Install the pinion and the cup (33).

Determine a thickness of shims greater than the overhang dimension "a" on the cup (33) measured in relation to the housing face to obtain a provisional clearance of 0.10 mm to 0.15 mm maximum for the preload shimming that follows.



Screw two diametrically opposed guide studs onto the housing. Place the shims (36) determined during step and Install the thrust plate (35). Install and tighten the screws (32) to 90-120 Nm after removing the studs.

Shimming the pinion

Remove or add shims (36) to obtain a pinion rotational torque of 0.80 to 2 Nm, measured using a Dial type torque wrench, with the pinion turning at approximately 1 to 5 rpm. Once the correct torque has been obtained, refit the screws (32) lightly smeared with Loctite 270 or equivalent, then tighten to a torque of 90 - 120 Nm.



Position the plug (41) in the housing, then refit the union (52) and the lubrication pipe clip nuts.

Massey Ferguson 5435, 5445, 5455, 5460, 5465, 5470, 5475 - Reinstall and shimming the differential assembly

Reinstall the right-hand flange (25) - Carefully place the assembled differential in the housing. The right-hand flange (25) is assembled on the centre housing in a similar way to the left-hand flange (9). The positioning is ensured by the locating ring (45). Reinstall the left-hand flange (9). Remove the cup (14) and the deflector (13) from the flange (9). Place the cup on the cone (17). Install the tool on the housing, using two screws (56) tightened to a torque of 85-100 Nm. Tighten the central screw to a torque of 10 Nm. Check that the ring gear is not restricted by the pinion and turn it several times to correctly "seat" the cones in the cups. Check the tightening torque of the tool central screw again.



Assemble and moderately tighten the hexagonal calibrated spacers "A" in the other two holes. Check that they are in contact with the housing. Carry out shimming to obtain: P2 = 0 to 0.25 mm.



Place a ruler edge against the two calibrated spacers. Using a set of shims, measure the clearance "J" between the finger of the tool and the ruler "B".



Calculate the dimension "C" between the cup (14) and the mating face of the flange (9). C = (114 + J) – 70.



On flange (9), measure dimension "Y" using a depth gauge and a ruler. Select the thickness "E" of the deflector (13) and shim (49) (if used) to obtain: E = P2 + (C - Y).



To carry out "P2" shimming, there are nine classes of deflector, each of a different thickness. If possible, shim to the maximum tolerance. Remove the shimming tool and cup (14). In flange (9), place deflector (13) and shim (49) (if used) and cup (14). The shim (49) (if used) must be fitted between the flange (9) and the deflector (13). Ensure the deflector is fitted in the right direction.



Reinstall the flange (9). Install the pipe (40). Check the backlash.

Adjusting and checking the backlash

The backlash between the ring gear and the pinion ensures crownwheel and pinion reliability and correct operation of the assembly. This backlash must be checked or adjusted after: adjusting the taper distance, shimming the differential unit.



Preadjustment - Prepare a thickness of shims (38) of 0.30 mm. Do not take into consideration the DC (ring gear offset, e.g. -0.20) engraved on the external surface of the ring gear after the pairing number. The pre-adjustment can be followed by an adjustment at a later stage, if the backlash is incorrect during the final check. Install the previously prepared shim(s) in the cavity of the half-unit (29). Lubricate and Install the cup (27). Reinstall and shim the differential assembly unit.

Checking the J2 backlash (J2 = 0.15 to 0.40 mm) - Place the dial gauge feeler pin half-way along a ring gear tooth. Check that the backlash is between 0.15 and 0.40 mm. Carry out this check on three points of the ring gear, at intervals of approx. 120°. If the backlash is incorrect, select and Install a new thickness of shim(s). Then offset the ring gear (23) in the desired direction, by increasing the value of the shims (38) and by reducing by the same amount the thickness of the deflector (13) or vice versa, in order to obtain the required backlash, without modifying the differential unit preload.



Reinstall the hand brake mechanism assembly. The plate (5) is rectangular. It must be positioned horizontally, lengthways, so that the pin (6) is correctly positioned against the rod (13). Reinstall the gear (2) (if fitted) and the circlip (1).



Reinstall the left-hand cover plate. Install the hand brake control support, the proportional PTO support (if fitted on the cover plate), remove the guide studs, Install and tighten the screws to a torque of 72-96 Nm. Position the control rod and adjust the hand brake mechanism. Reinstall: right-hand hydraulic cover plate; intermediate shaft, the driving gear and the top link support; linkage cover plate and the brake pistons; left and right-hand trumpet housings; stabiliser supports; hitch hook; wheels. Tighten to a torque of 400-450 Nm.

Reconnect the tractor between the gearbox and the rear axle. Top up the oil level in the housings and check the level on the gauge located at the back of the rear axle. Remove the safety chocks. Reinstall the body (if removed). Start up. Bleed the main brakes and the trailer brake (if fitted). Carry out a road test. Check the correct operation of the controls and the electrical circuits. Check the tightness of the trumpet housing mating faces on the housing, the cover plates and the hydraulic unions.

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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