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Massey Ferguson 3115, 3120, 3125 - Rear Axle Trumpet Housings
On MF 3115, 3120, 3125 tractors, the trumpet housings support the RH and
LH axle shafts and house the final reduction units which transmit the
drive from the differential assembly. The two trumpet housings are
identical and are fitted on either side of the center housing.
Massey Ferguson 3115, 3120, 3125 - Construction Trumpet Housings
The half shaft (2) is supported by two taper roller bearings (5) and (8)
fitted opposite each other. The unit is sealed on the outside by a
triple lip seal (3) and on the inside by a single lip seal (7). The
final reduction planetary carrier assembly (21) fitted with three
pinions (18) is splined onto the half shaft (2). Shims (22) located at
the end of the axle shaft allow the taper roller bearing preload to be
adjusted.
The half shaft (2) and the planetary carrier assembly (21) are
held by the washer (23) and the bolt (24). The ring gear (10) is a force
fit in the trumpet housing. It comprises five locating dowels (9) which
center the brake plate (26). Drive from the differential is transmitted
to the final reduction planetary gears through a planetary shaft (25) on
to which the brake disc (27) is splined.
Parts List - (1) Wheel stud, (2) Axle shaft, (3) Triple
lip seal, (4) Seal housing, (5) Bearing cup, (5A) Bearing cone, (6)
Trumpet housing, (7) Seal, (8) Bearing cup, (8A) Bearing cone, (9)
Locating dowel, (10) Planetary ring gear, (11) Spur washer, (12) Plug,
(13) Bolt, (14) Spacer, (15) Circlip, (16) Planetary gear pin, (17)
Thrust washer, (18) Planetary gear, (19) Spacer, (20) Needle roller,
(21) Planetary carrier, (22) Shim(s), (23) Retaining washer, (24) Bolt,
(25) Sun wheel, (26) Brake plate, (27) Brake disc, (28) Locating dowel,
(29) Bolt
MF 3115, 3120, 3125 - Trumpet housing assembly
Removal
Immobilize the tractor. Apply the handbrake. Fit chocks between the
frame and the front axle. Drain the rear axle only. Using a trolley
jack, raise the side of the tractor involved. Support the tractor with
an axle stand. Remove the wheel. Remove the stabilizer bracket.
Disconnect the draft control sensor harness (without disconnecting the
harness).
Remove the cab attaching bolts (A) with the nuts. Raise the cab sufficiently to lift the support spacer (B) clear. Check the clearance between the hood and the windscreen (if insufficient remove the sheet metal). Position a suitable support on a trolley jack under the trumpet housing. For the LH trumpet housing disconnect the lift hydraulics valve supply hose (plug the ends).
Unscrew the attaching
bolts (29). Separate the trumpet housing from the rear axle housing.
Remove: brake disc (27); planetary shaft (25); locating dowel (28). To
prevent the brake piston from coming out of the housing, it is
recommended that two wide washers and two bolts be fitted diametrically
opposite each other to hold it in place. Remove the brake plate (26).
Massey Ferguson 3115, 3120, 3125 - Trumpet Housings Refitment
Clean the mating faces of the center housing and the trumpet housing
with a non-greasy solvent. Apply a bead of oil resistant silicone
(Silicomet type) to the inner edge of the center housing. Do not block
up the oil drain hole in the housing. Check that the disk (27) slides
freely on the planetary shaft (25). Refit the locating dowel (28), the
planetary shaft (25) and the brake disc (27).
Screw two dowel pins into diametrically opposite positions on the center housing. Refit the brake plate (26) in the trumpet housing. To retain the plate, apply three spots of "Amber Technical" or equivalent grease to the surface of the ring gear (10). Fit the trumpet housing to the center housing. Turn the shaft (2) to engage the planetary shaft (25) in the planetary gears (18).
Clean the bolts (32) and coat them with Plastex, Hylomar or an equivalent gasket sealant. Fit and tighten the bolts (29) to a torque of 170-210 Nm. Refit the cab attaching bolts with the nuts and locknuts to a torque of: Nut - 27-35 Nm, Locknut - 13-20 Nm (with Loctite 270). Refit the draft control sensor.
Lightly coat the draft control sensor
with Loctite Anti-seize or equivalent grease. Refit the wheel. Tighten
to a torque of 400-450 Nm. Remove the axle stand. Test the hydraulic
lift and brake circuits. Check for leaks: between the trumpet housing
and the center housing, from the lift system valve supply hose (LH
trumpet housing).
MF 3115, 3120, 3125 - Planetary carrier assembly
Disassembly
Remove the trumpet housing. Remove the bolt (24). Remove the retaining
washer (23) and the shim(s). Remove the planetary carrier assembly (21).
Remove the bolt (13) and the spacer (14). Open out the circlip (15).
Using a copper tipped mallet, tap lightly on the three pins (16). Remove
the three pins (16) and the circlip (15). Remove the three planetary
gears (18), the needle rollers (20), the spacers (19) and the thrust
washers (17).
Reassembly
Clean the planetary carrier (21), the pins (16) and the planetary gears
(18). Check the condition of the parts. Coat the needle rollers (20)
with "Amber Technical" or an equivalent grease. Into each planetary gear
(18) insert two rows of needle rollers separated by a spacer (19). Each
planetary gear has 56 needle rollers. Fit the planetary gears (18) and
the thrust washers (17). Fit three pins (16) with the circlip (15).
Open
out the circlip (15). Tap lightly on the three pins to insert the
circlip (15) into the planetary carrier groove. Position one end of the
circlip in contact with the pin (16). Clean the threads of the bolt
(13). Fit the spacer (14). Coat the bolt (13) with Loctite 270 before
fitting. Tighten to a torque of 34-50 Nm. Check that the spur washer
(11) is fitted. Refit the planetary carrier. Fit shims to obtain the
required preload. Refit the trumpet housing.
Bearings and Seals
Disassembly
Separate the trumpet housing from the center housing. Remove the
planetary carrier. Remove: spur washer (11), bearing cone (8A) (runs
free on shaft). Withdraw the shaft (2) from the trumpet housing. Extract
the cone (5A). Drive out the triple lip seal (3). Using an extractor,
remove: cup (5); housing (4) for seal (3); cup (8). Drive out the seal
(7).
Reassembly
Clean the seal contact surfaces, the cup seats and the cones in the
trumpet housing and on the shaft. The seal, cup and cone contact
surfaces must be free from burrs and damage. Coat the outside diameter
of the seal with Loctite 542. Fit the seal the correct way round.
Replacement of seal (7): Without replacing the shaft (2) - So that the
seal lip is not in the same place on the shaft, press on the seal until
it is 9 mm from the shoulder of the cup. Replacing the shaft (2) -
Position the seal 8 mm from the shoulder of the cup. Lubricate the cups
(8) and (5) and press them fully on to the shoulder.
Press the housing (4) to within 20 mm of the trumpet housing. Push the
triple lip seal (3) up against the shaft shoulder. Ensure that the seal
is fitted the correct way round. Lubricate the shaft (2) and press the
cone (5A) against the shoulder. Lightly grease the cone (5A), the lips
of seals (3) and (7) (use BP Agricharge or an equivalent grease).
Protect the splines of the shaft (2) and insert it into the trumpet
housing.
The lips of the seal (3) must face outwards. Remove the
protection from the shaft and lightly lubricate the cone (8A). Fit shims
to obtain the required preload. Replace the plug (12) by a grease
nipple. Partly fill the cavity at the end of the trumpet housing between
the cone (5A) and the seal (3) with BP Agricharge or an equivalent
grease. Remove the grease nipple and refit the plug. Refit the trumpet
housing.
Massey Ferguson 3115, 3120, 3125 - Axle shaft bearings preload
Place the trumpet housing assembly in a vertical position. Remove the
bolt (24) and the washer (23). Seat the cones (5A) and (8A) in their
cups by turning the trumpet housing on its shaft. Fit shims (22)
required to provide thickness greater than dimension X to obtain end
play. Fit the washer (23) and the bolt (24) and tighten to a torque of
270-440 Nm.
Using a dial gauge, check the end play by moving the planetary carrier laterally. Remove the bolt (24) and the washer (23). On the basis of the reading obtained, remove the number of shims required to obtain a preload of: P1 =0.025 to 0.125. Clean the threads at the end of the shaft (2). Refit the washer (23). Clean the bolt (24) and coat it with Loctite 241. Tighten to a torque of 270-440 Nm.
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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 |