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Massey Ferguson 6465, 6480, 6490 - Rear axle planet carrier

MF 6400 Series Tractors Service and Repair

Massey Ferguson 6465, 6480, 6490 Rear axle - Removing and refitting, disassembling and reassembling the planet carrier

Removal

MF 6465, 6480 Tractor - Remove the trumpet housing assembly. If possible, place it in a vertical position with the planet carrier facing upwards. Immobilise the axle shaft or the planet carrier (25). Remove: M20 screw (28); tripod washer (27); shim(s) (26); planet carrier (25) of the ring gear.

MF 6485, 6490 Tractor - Remove the trumpet housing assembly. If possible, place it in a vertical position with the planet carrier facing upwards. Immobilise the axle shaft or the planet carrier (25). Remove: lock washer (1). The lock washer is fixed with Loctite 401; M20 screw (28); tripod washer (27); shim(s) (26); planet carrier (25) of the ring gear.

Disassembly

Remove: screw (18); spacer (17); snap ring (19) by moving its two ends apart. Using a hammer, tap gently on the three pins (20). Remove the three pins and the snap ring. Remove: three planet gears (22); needle rollers (23); spacers (24); friction washers (21).

Reassembly

Clean the planet carrier, the pins and the planet gears. Check the parts. Smear the needle rollers with miscible grease. Fit each planet gear with two rows of needle rollers (23) separated by a spacer (24). Fit the planet gears. Centre the friction washers (21) in the planet carrier. Imprint E on one surface of the planet gears (22) (punch mark or groove) must face the opposite way to the splined hub of the planet carrier. Engage the three pins (20) with the snap ring (19).

Open the snap ring (19). Tap gently on the three pins so that the snap ring fits into the groove of the planet carrier. Manually check the axial clearance of each planet gear. Position one end of the snap ring against the pin (20). Clean the thread of the screw (18) and the tapped hole for this screw in the planet carrier. Fit the spacer (17). Fit and tighten the screw to 34-50 Nm, after lightly smearing its thread with Loctite 270 or equivalent.

Refitting

MF 6465, 6480 Tractor - Check that the tab washer (16) is present. Refit the planet carrier (25). If necessary, shim the tapered roller bearings of the axle shaft. Immobilise the axle shaft (2) or the planet carrier (25). Refit the shim(s) (26) and the tripod washer (27). Screw in and tighten the M20 screw (28) to 374-506 Nm after lightly smearing its thread with Loctite 270 or equivalent. Refit the trumpet housing assembly.

MF 6485, 6490 Tractor - Check for the presence of the tab washer (16). Refit the planet carrier (25). If necessary, shim the tapered roller bearings of the axle shaft. Immobilise the axle shaft (2) or the planet carrier (25). Refit the shim(s) (26) and the tripod washer (27). Screw in and tighten the M20 screw (28) to 410 Nm. Slide a lock washer (1) onto the head of the M20 screw (28). Ensure its tabs B are correctly housed in moulded slots E of the planet carrier (25).

If this is not the case, repeat the step with the second lock washer; if this is still not the case, repeat the step with the third. Three lock washers (1) are available from the spare parts catalogue. Each of the lock washers has a 10° angular offset.

Case 1: A lock washer is selected - Apply three spots of Loctite 401 or equivalent to the mating face of the selected lock washer which is turned towards the tripod washer (27). Loctite 401 prevents the lock washer (1) from moving when the trumpet housing is being refitted to the centre housing. When the trumpet housing is refitted, the sun gear (29) holds the lock washer in place. Case 2: No lock washer is selected - Gently retighten the M20 screw (28), taking care not to exceed the maximum torque of 560 Nm. Refit the trumpet housing assembly.

Massey Ferguson 6465, 6480, 6490 - Replacing tapered roller bearings and seals

Disassembly

Remove: trumpet housing assembly; planet carrier (25). Remove: tab washer (16); axle shaft (2); bearing cone (13). If necessary, extract: bearing cone (7); seals (5) (11) and discard them. Using a suitable puller or a makeshift tool, extract or drive out: bearing cups (8) (12); friction cage (6).

Reassembly

Clean and check all components. Replace those that are defective. Smear the external surface of the seal (11) with a film of clean transmission oil. Using a suitable fitting drift, fit the seal (11) to within approximately 8 mm of the shoulder of the cup (12) on the trumpet housing, positioning its lip towards the bearing cone. If a groove has been worn into the axle shaft at the location of the old seal (11), offset the new seal slightly so that its lip ensures the axle shaft is completely sealed beyond the worn groove. Fit: bearing cups (8) (12) against their respective shoulders; friction cage (6) according to the distance indicated.

MF 6465, 6480 tractors fitted with GTA1040 transmission

MF 6485, 6490 tractors fitted with GTA1540 transmission

MF 6465, 6480 Tractor - Fit the new three-lipped seal (5) level with shoulder E of the flanged axle shaft or straight axle shaft. Fit the bearing cone against its shoulder on the flanged axle shaft or straight axle shaft using a suitable tool.

MF 6485, 6490 Tractor - Fit the new three-lipped seal (5): 4.0 ± 0.5 mm from shoulder E of the flanged axle shaft; 5.5 ± 0.5 mm from shoulder E of the straight axle shaft.

Fit the bearing cone against its shoulder on the flanged axle shaft or straight axle shaft using a suitable tool.

Lightly smear the bearing cone (7) and the lips of the seals (5) (11) with bearing grease. Protect the seal lip (11) by temporarily masking the splines on the axle shaft with a flexible protection. Insert the prepared axle shaft into the trumpet housing fitted with the seal (11) and the bearing cones (8) (12), positioning the three lips of the seal (5) towards the outside of the trumpet housing. Refit: bearing cone (13); tab washer (16); planet carrier (25). If necessary, shim the tapered roller bearings; trumpet housing assembly.

Temporarily replace the plug (9) with a grease nipple. Partially fill cavity A with BP Agricharge grease or equivalent. Remove the grease nipple. Screw in the plug.

Massey Ferguson 6465, 6480, 6490 - Shimming the tapered roller bearings of the axle shaft

If the following parts are to be replaced, the shimming of the tapered roller bearings on the axle shaft must be checked or carried out: the flanged or straight axle shaft (2); the tapered roller bearings; the trumpet housing (10); the tab washer (16); the planet carrier (25). The preload shimming of the tapered roller bearings on the axle shaft is carried out using shim(s) (26) fitted between the end of the axle shaft (2) and the tripod washer (27). In order to correctly shim the tapered roller bearings, fit the trumpet housing in a vertical position.

Preparing for shimming

Fit: bearing cone (13); tab washer (16); planet carrier (25). Shim(s) (26) with a thickness greater than the space between the end of the axle shaft (2) and the mating face of the tripod washer (27) on the planet carrier. This should give a temporary clearance J.

Temporarily lock the M20 screw (28) at: 374 Nm (tractors fitted with GTA1040 transmission); 410 Nm (tractors fitted with GTA1540 transmission).

Shimming

Tap the rim of the planet carrier with a plastic hammer while turning the trumpet housing by several turns. Fit a dial gauge on the trumpet housing (10) with its feeler pin positioned near the centre of the planet carrier (25). Set the dial gauge needle to zero. Using suitable levers, move the planet carrier vertically. Measure clearance J indicated on the dial gauge. Repeat the step several times. Calculate the average of the clearance J readings.

Reduce the shim (26) thickness according to value J + (0.02 to 0.12) to obtain a preload P1 = 0.02 to 0.12 mm. If possible, shim to the maximum tolerance.

MF 6465, 6480 Tractor - Definitively fit the tripod washer (27). Lightly smear the thread of the M20 screw (28) with Loctite 270 or equivalent. Tighten this screw to a torque of 374-506 Nm.

MF 6485, 6490 Tractor - Definitively fit the tripod washer (27). Tighten the M20 screw (28) to 410 Nm. From the three possible lock washers, select the lock washer (1) which will be fitted definitively. Replacing a stud on the flanged axle shaft. If necessary, remove the wheel from the relevant flanged axle shaft. Drive out the defective stud. Clean the new stud and its housing in the flange. Lightly smear the ribbed part of the new stud with Loctite 270 or equivalent and fit it using a bronze drift and a suitable hammer.

MF TRACTORS TROUBLESHOOTING
1652	1749	2620	2725	2805
3050	3120	3640	3709	4245
4455	5320	5455	5613	6150
6280	6480	6615	7618	7720