Removable PTO shaft


On some tractors, the driven pinions (7) (18) are fitted on the power take-off PTO shaft located on the lower rear housing. These pinions are constantly engaged with the driving pinion(s) (depending on version) and driven by the upper shaft line where the engine speed is transmitted by the power take-off clutch. At the front, the removable shaft (12) turns on a roller bearing (24) inserted into a fixed bearing block on the rear of the centre housing. At the rear, the shaft is supported by a splined sleeve (5) that turns in taper roller bearings.



Washer (4) is integral via a tab with sleeve (5) which itself is integral with shaft (12) via splines. The sleeve is serrated all around its outside edge and transmits speed information to the onboard electronic system via the sensor located on the right-hand side of the rear housing. An oil splash from the centre housing along with a central port and radial channels drilled in the shaft provide lubrication of the:
- friction washers (10)
- taper roller bearings.

In the 540 rpm or 750 rpm (optional) configurations, the shaft (12) is integral with pinion (7) via splines. Pinion (18) is an idling gear that runs on the hubs of pinion (7) and sleeve (5). In the 1000 rpm configuration, the shaft (12) is integral with pinion (18) via splines. Pinion (7) is an idling gear that runs on the hub of pinion (18) and the front bearing. The oil tightness of the rear bearing is provided by cassette seal (14) and O’ring (15). Bearing clearance is adjusted by shim(s) (23) placed between the rear housing and bearing (22).


Part list 
(1) Front bearing (2) Bearing cup (3) Bearing cone (4) Castellated washer (5) Serrated sleeve (6) Snap ring (7) 540 or 750 rpm driven pinion (8) Bearing cone (9) Protector (10) Friction washer (11) Bolt (12) Shaft (13) Bolt (14) Cassette seal (15) O'ring (16) Circlip (17) Circlip (18) 1000 rpm driven pinion (19) O'ring (20) Friction washer (21) Bearing cup (22) Bearing (23) Shim(s) (24) Roller bearing

Special point
- The removal and refitting of the power take-off PTO housing is necessary for all maintenance operations on the layshaft apart from the removal of bearing (22), the replacement of seals (14) (15) and shaft (12). The centre housing must be drained either partially or completely depending on the operation and must be brought up to level again after the maintenance.

Disassembling and reassembling pinions 540 - 1000 rpm or 750 - 1000 rpm


- The 540 - 1000 rpm and 750 - 1000 rpm versions have the same assembly configuration. The only difference is that the 540 rpm and 750 rpm pinions have a different number of teeth.
Uncouple the power take-off housing from the centre housing.
Recover the friction washer (20).
Remove snap ring (6) and support driven pinions (7) (18).
Pull shaft (12). Remove the pinions. Recover the friction washer (10).
Clean and check the components. Replace any parts found to be defective. Check that the oil channels in shaft (12) are not obstructed. Check that the interior of sleeve (5) is clean and free of burrs. Lubricate and fit a new O’ring (19).

Assemble driven pinions (7) (18) and friction washers (10) smeared with miscible grease and placed
according to the overall view. Maintain the pinions inserted and thrust against sleeve (5).
Engage shaft (12) against the shoulder of the sleeve.
Install snap ring (6).
Smear friction washer (20) with miscible grease and apply it against bearing (24).
Couple the PTO housing to the centre housing.

Disassembling and reassembling the front bearing block (1)
Uncouple the power take-off housing from the centre housing.
Take out bolts (11). Remove the front bearing block (1).
Where necessary, note the manner in which bearing (24) is assembled and then extract it from the bearing block.
Clean and check the components. Replace any parts found to be defective.
If disassembled, position bearing (24) using an appropriate insertion drift, with the rounded cage holding the rollers turned to face the forward end of shaft (12).
Install bearing block (1). Fit and tighten bolts (11) with their threads lightly smeared with Loctite 241 and tighten to a torque of 27 - 35 Nm. .
Couple the power take-off housing to the centre housing.

Disassembling and reassembling the bearings


Uncouple the power take-off housing from the centre housing.
Take out the bolt from the lower sensor and remove it. Disassemble the pinions and the shaft (see A).
Take out bolts (13), remove bearing block assembly (22) comprising sleeve (5), oil seal (14), O’rings (15) (19), shim(s) (23), bearing cup (21), bearing cones (3) (8) and castellated washer (4).
Take off bearing cup (2).
On sleeve (5), remove circlip (17). Remove bearing cone (3), castellated washer (4), bearing cone (8and circlip (16).

Special point
- If the power take-off housing, bearing block (22), taper roller bearings (2) (3) (8) (21) or castellated washer (4) had to be replaced, the bearings must be shimmed again.
Clean and check the components. Replace any parts found to be defective. Check that the oil channels in shaft (12) are not obstructed.
On sleeve (5), place circlip (16), bearing cones (3) (8) separated by castellated washer (4). Fit circlip (17).
Install cup (2), sleeve (5) assembled, cup (21), bearing block (22) with shim(s) (23, O’rings (15) (19). Install and tighten bolts (13) to a torque of 72 - 96 Nm.
Install the 540 - 1000 rpm or 750 - 1000 rpm pinions and shaft (12).
Couple the power take-off PTO to the centre housing.
Install the sensor, O’ring and bolt

Removing and refitting the shaft and replacing the oil seal


Partially drain the centre housing in order to avoid oil from running through the shaft bore, or raise the rear axle of the tractor (after chocking the front wheels).
Remove O’ring (6). Take out shaft (12). Take off O’ring (19).
Check that the interior of sleeve (5) is clean and free of burrs. Lubricate and fit a new O’ring.
Check that the channel in the shaft is not obstructed. Clean and then engage the shaft thrust up against the shoulder on sleeve (5). Install snap ring (6).

Remove the trolley jack.
Replacing the oil seal on rear bearing block
Partially drain the centre housing.
Take out bolts (13), remove bearing block (22) while holding the shaft (12) pushed forwards in order not to displace sleeve (5) on pinion (18). Take off seal (15). Recover the shim(s) (23).
Note the direction of assembly of seal (14) and then extract it.
Clean and check the components. Replace any parts found to be defective.
If necessary, before fitting seal (14). Lightly smear the external diameter of seal (14) with Loctite 542. Using a press, insert the cassette seal into the bearing block (22) with its lip turned to face taper roller bearing (8) (21).
Screw two diametrically opposed threaded rods (Ø 10 x 150, length approximately 50 mm) in place of bolts (13). Check that sleeve (5) is free from burrs. Lubricate the internal diameter of cassette seal (14with transmission oil. Refit the bearing block fitted with lubricated seal (15) and the shims (23) removed during disassembly.

Hold the shaft (12) pushed forwards, as described in operation 35.
Alternatively and uniformly screw two bolts and washers on the threaded rods so as to insert the bearing parallel with the face of the housing.
Remove the threaded rods. Fit and tighten the initial bolts (13) to 72-96 Nm.
Top up the oil level in the housings and check it on the transparent tube mounted on the left-side of the centre housing.

Shimming 



Carry out the shimming of bearings (2) (3) and (8) (21) before fitting seal (14).
Using a depth gauge, measure dimension A on the power take-off PTO housing.
Place the sleeve prepared in operation 24, the bearing cups and bearing block (22) thrust against a locally manufactured support.



With the help of an operator, apply strong continuous pressure around the rim of the cup (2). At the same time, alternately turn the sleeve left and right in order to correctly seat the bearing cones in their cups. Measure dimension B at two opposing points. Take the average of the two measurements.
Apply the formula B - A. Place a thickness of shim(s) (23) in order to provide a clearance of: J1 = 0.05 mm to 0.15 mm.