Removing and install - Standard trumpets

 Removing and install the trumpet housing assembly

Drain the centre housing.
Immobilize the tractor. Take off the wheel concerned. Position an axle stand.
Remove the cab fixing bolts and the stabilizer support.
Take out the lift ram pin.
Support the trumpet housings with an appropriate support and an adapted trolley jack.
Take out bolts (39) excluding bolt (40) (Fig.1).


Separate the centre housing, the trumpet housing assembly, crownwheel (15) and brake plate (30). The sun gear (29) and brake disc (35) remaining on the housing (Fig.1). If necessary, take out the sun gear and the brake disc.
The piston of brake "P" remains in the housing (1) (Fig.1).
Clean the mating faces of trumpet and centre housings. Remove any remaining traces of sealing compound. Dry the parts.
Place a bead of silicone sealing compound (Silicomet type) in angle "D" of the centre housing (1) (Fig.2).


The diameter of the bead must be uniform, of small section and without joins.
Introduce the sun gear shaft (29) into the differential. Refit the brake disc (35) while checking that it slides freely on the splines of the shaft.
Support the trumpet housing with the equipment used to remove it. If necessary, screw two guide studs on to the centre housing. Engage the trumpet housing. Turn the axle shaft and push the trumpet housing until it makes contact with the centre housing.
If used, remove the guide studs. Smear the bolts (39) with a sealing compound such as "Plastex" or "Hylomar" and tighten them to a torque of 220 - 300 Nm.
Replace the various components around the trumpet housing. Refit the wheel and tighten the studs or wheel nuts to the correct torque depending on the version.
Top up the oil level in the housings and check it in the transparent tube located on the left-hand side of the centre housing.
Check the lift ram operation. Carry out a road test of the brake circuit. Check the oil tightness of the trumpet housing and hydraulic unions.

Removing and install the brake plate and crownwheel assembly

Remove the trumpet housing assembly.


If possible, place the trumpet housing on an appropriate stand (plain axle) or on the flange (flanged axle) with the sun gear (29) upwards. Remove bolts (40).
Free and take off the brake plate (30) and the crownwheel (15).
Clean the mating faces of the trumpet housing, crownwheel and brake plate with solvent. Remove all traces of previous sealing compound. Dry the parts.
Place a bead of sealing compound (Silicomet type) in angles "B" and "C" located on the trumpet housing (10) and the brake plate (30) according to the arrows in Fig.3.
Install the crownwheel and the brake plate. Fit and tighten the bolts (40) to 100 - 300 Nm.
Install the trumpet housing.

Removing and disassembling the planetary carrier

Remove the trumpet housing.
Free and take off the brake plate assembly (30) and crownwheel (15).
Immobilise the axle shaft and planetary carrier.
Take off bolts (28), washers (1) (27), and the shim(s) (26). Remove the planetary carrier assembly (25) (Fig.4).

Remove the bolts (18) and spacer (17). Remove snap ring (19) by opening its two ends (Fig.5).
Drive out and remove the pins (20). Take out the friction washers (21) and the planetary gears (22) from the planetary carrier. Recover the two ranks of needle bearings (23) separated by spacer (24).

Reassembling and refitting the planetary carrier

In the planetary gears, fit the needle bearings (23) previously coated lightly with miscible grease.
Install the planetary gears. Carry out operation 28 in reverse order. Place the spacer (17). Lightly smear bolts (18) with Loctite 270 (Fig.5) and tighten to a torque of 34 - 50 Nm.
Check for the presence of the tab washer (16). Install the planetary carrier assembly (25) (Fig. 7). If necessary, shim the bearings.
Immobilise the axle shaft and the planetary carrier. Install washers (1) (27) with the shim(s) (26) between them. Fit bolt (28) previously lightly smeared with Loctite 270 or equivalent, and tighten to the following torque:
- 270 - 440 Nm : flanged axle shaft, Ø 82 mm.
- 340 - 500 Nm : straight axle shaft, Ø 95mm.
Install the brake plate assembly (30) and crownwheel (15).
Install the trumpet housing.

Replacing the axle shaft bearings

- trumpet housing assembly.
- brake plate assembly (30) and crownwheel.
- planetary carrier assembly.
Take off tab washer (16) and shaft assembly (2).
On the shaft:
- remove bearing cone (13)
- extract bearing cone (7) and seal (5).
Using an extractor or a locally manufactured tool, remove the bearing cups (8) (12) and cage (6).
During the replacement of the bearings, the replacement of seal (11) is also recommended.
Clean and check the components. Replace any parts found to be defective.
Positioning the seal (11)


Smear the external diameter of the seal with Loctite 542 and insert it 8 mm from the shoulder of bearing cup (12) (Fig.6), with the lip of the seal turned towards the drive unit.
If a circumferential groove appears on the shaft (2) at seal (11) location, offset the new seal slightly so that the lip runs on a different section of the shaft. Bush is sealed with Loctite 648 and force fitted on to shaft.


- bearing cups (8) (12) thrust against their respective shoulders
- cage (6) according to Fig.7
- bearing cone (7), lubricated, and thrust against the shoulder on shaft (2), depending on the version.

Positioning the three-lipped seal (5)
Insert the new seal, respecting the direction of assembly and with the seal thrust against bearing cone (7) (Fig.7).


Moderately grease the cone and seal lips (5) (11) (BP Agricharge grease or equivalent).
Protect the lip seal (11) by temporarily masking the splines on the axle shaft with a flexible protection.
Introduce the prepared shaft into the trumpet housing fitted with its seal and its cups, and with the lips of the seal (5) turned outwards. Install cone (13) and replace the tab washer (16).
Install the planetary carrier (25) assembly.
Carry out shimming of the bearings.
Install the brake plate assembly (30) and crownwheel.
Temporarily replace plug (9) with a grease nipple. Partially fill cavity "A" (Fig.8) of the trumpet housing with grease (BP Agricharge or equivalent). Remove the grease nipple. Screw in the plug.
Install the trumpet housing assembly.


Shimming the axle shaft bearings

Components concerned by the shimming

The axle shaft (2), the taper roller bearings (7) (8) (12) (13), the trumpet housing, tab washer (16) and planetary carrier (25). The pre-loaded shimming of taper roller bearings on the axle shaft is carried out via the shim(s) (26) placed between washers (1) (27) (Fig.9). To carry out the correct shimming of the bearings, place the trumpet housing in a vertical position (Fig.9).


With the bearing cone (13), tab washer (16), planetary carrier (25) and washer (1) already fitted, place a thickness of shims (26) greater than the space between washer (1) and the thrust face of the washer (27) on the planetary carrier (Fig. 13), so as to obtain a provisional clearance of approximately 0.10 mm to 0.15 mm, in order to carry out the final shimming with pre-loading.
Place washer (27). Provisionally tighten bolt (28).

Shimming (Fig.10)


Press hard on the planetary carrier and simultaneously turn the trumpet housing several times.
Place a dial gauge on the planetary carrier, the index positioned towards its centre.
Set the dial gauge to zero.
Using two appropriate levers, move the planetary carrier upwards.
In relation to the clearance "J" measured, remove a shim (26) thickness to obtain pre-loading of:
P1 = 0.02 mm to 0.12 mm (Fig.9) according: J – (0.02 to 0.12).
Definitively fit washer (27) and bolt (28) previously lightly smeared with Loctite 270 or equivalent, and tighten in accordance with the torque indicated.

Replacing a wheel stud on the axle flange

Drive out the defective stud.
Clean the new stud and its lodging in the hub.
Smear the ridges of the stud with Loctite 270 or equivalent and insert it using a bronze drift and an appropriate hammer.