4-speed PTO


Engine speed is transmitted to the PTO clutch (1) fitted at the front of the centre housing. The intermediate shaft (2) is linked via splines at one end to the clutch and at the other end either to the double gear (13) for the 2-speed power take-off PTO version, or to the dog clutch sleeve (31) for the economy 4-speed PTO version. The double gear (13) turns on the two tapered roller bearings (3) (4) and (7) (8) respectively mounted in the bore of the centre housing and the cover plate (10). A piston (9), housed in the cover plate and controlled by the 17 bar hydraulic system, allows braking of the double gear (13) when the control lever is placed in the PTO brake position.

4-speed PTO

This feature allows the 540 rpm or 1000 rpm speeds to be obtained at an engine speed of 1550 rpm.

Standard position
When the sleeve (31) is moved forwards, the intermediate shaft (2) is secured to the shaft (35) that drives
the double driving gear (13). This configuration is identical to the 2-speed power take-off PTO version.

Economy position
By moving the sleeve (31) backwards, the drive is transmitted to the dog gear (34) (which rotates freely on the shaft (35)) and to the double gear (18) which drives the driving gear (13). The ratio of the double gear (18) is 1.292.

PTO brake
When the button is in the power take-off PTO brake position, the PTO brake solenoid valve mounted on the right-hand cover plate is opened. The chamber behind the piston (9) is supplied. The piston moves, compressing the cup (8) on the cone (7) while gradually immobilising the driving gear (13), constantly engaged with the 540 rpm and 1000 rpm gears.



4-speed PTO
(1) Clutch  (2) Intermediate shaft  (3) Cup  (4) Cone  (5) Washer  (6) Screw  (7) Cone  (8) Cup (9) Brake piston  (10) Cover plate  (11) Shims  (12) "O" ring  (13) Driving gear  (14) Double gear assembly  (15) Deflector  (16) Washer  (17) Needle roller bearing  (18) Double gear  (19) Spacer (20) Needle roller bearing  (21) Washer  (22) Set screw  (23) Pin  (24) Locking screw  (25) Nut
 (32) Circlip  (33) Washer  (34) Dog gear  (35) Shaft  (26) Fork  (27) Screw  (28) Needle roller bearing  (29) Circlip  (30) Ring  (31) Dog clutch sleeve


4-speed economy PTO (without shimming)


Remove the nut (25) and the locking screw (24) from the fork (26).
Remove the set screw (22).
Take out the pin (23) from the double gear assembly (14) in order to disengage the fork (26). To release only the fork, pull the pin (23) back slightly.
Remove the friction washers (16) (21). Take care not to let the washers to fall into the housing.
Take out the double gear assembly (14) (through the spool valve support aperture, only for the version without shimming).

Remove the needle roller bearings (17) (20) and the spacer (19) from the gear (18).
Remove the circlip (32). To facilitate access to the circlip, use short-handled pliers.
Take out the gear (13) and shaft (35) assembly held in place by the washer (5) and the screw (6).
Remove the washer with flat section (33). Take care not to let the washer or the circlip fall into the housing. Hold in place the dog gear (34) and the needle roller bearing (28). The cone (4) remains in the cup (3) during removal of the gear.
Remove the dog gear (34) and the needle roller bearing (28).
Remove the bearing cone (4).
Remove the Allen screw (27) (if necessary).
Take out the shaft (2) and the dog clutch sleeve (31) (if necessary). The circlip (29) remains on the shaft (2).

Check and clean the components. Replace any defective parts.
Install the shaft (2) and the dog clutch sleeve (31) (if removed).
Smear the screw (27) with Loctite 221 and tighten (if removed).
Install the cone (4). Move the gear (13) prepared with the shaft (35) forwards. Fit the dog gear (34), the needle roller bearing (28), the washer (33) and the circlip (32). Push on the gear (13). Position the washer (33). Install the circlip (32).
In the gear (18), position the spacer (19) and the needle roller bearings (17) (20). Position the double gear assembly (14). Fit the washer (16) smeared with miscible grease (Amber Technical or equivalent).

Check that the channels in the pin (23) are not blocked. They are used for lubricating the needle roller bearings (17) (20) and the front bearing of the pinion. Slightly engage the pin (23) in order to hold the washer (16) in place. Position the washer (21) smeared with miscible grease. Centre the double gear assembly (14).
Definitively fit the pin (23) into the gear assembly (14) and in the fork (26) while ensuring the correct positioning of the hole for the set screw (22).
Smear screw (22) with Loctite 542 and tighten to a torque of 28 - 43 Nm.
Clean the mating face of the cover plate (10).
Smear the mating face of the housing with a sealing product (Loctite 510 or equivalent).
Check for the presence of the cup (8). Tighten the screws (3) to 130-170 Nm.
Reconnect the pipes (1) (2).
Fit the screw (24) and the nut (25) onto the fork (26).

Adjust the locking of the fork (26):
- Position the fork (26), with the locking screw (24) on flat "M" of the pin (23) (between the two locking slots) and tighten the screw to compress the ball.
- Loosen the screw by one-quarter turn. Smear the nut (25) with Loctite 241. Tighten to a torque of 15 - 20 Nm.
- Check that the fork locks correctly.
Adjust the control.
Clean the mating face of the spool valve support.
Smear the mating face of the spool valve support cover plate with a sealing product (Loctite 510 or equivalent).
Install the spool valve support.
Smear the thread of the two lower screws (4) with Loctite 510. Tighten the 4 screws to a torque of 50 - 70 Nm.
Check PTO and PTO brake operation.
Check tightness:
- of the mating faces (spool valve support, cover plate, linkage cover plate)
- Hydraulic unions

4-speed economy PTO (with shimming)


The shimming J/P is to be carried out when working on the following components: the gear (13), the deflector (15), the cones (4) (7), the cups (3) (8), the piston (9) and the cover plate (10). For correct shimming of the cones (4) (7) and the cups (3) (8), it is necessary to remove the linkage cover plate.

Remove the linkage cover plate.
Remove the power take-off PTO gears.
Separate the gear (13) from the shaft (35) using a press and a suitable fixture. The friction ring (30) is force fitted into the shaft (35).
Extract the bearing cone (7) and the deflector (15). To extract the cup (3), the 540/1000 rpm gears must be removed. Partially drain the axle housing.

Check and clean the components. Replace any defective parts. For correct lubrication of the ring (30), a deflector (15) is fitted between the gear (13) and the bearing cone (7), in contact with the cup.
Install the deflector (15) on the gear (13), and press-fit the cone (7) fully home into the shoulder.
Install the cone (4) into the cup (3). If the cup (3) has been replaced, refit the 540/1000 rpm gears. Top up the housing oil level.
Preparing and shimming the gear (13).
Take out the gear (13) and assemble it with the shaft (35), then fit the washer (5) and the screw (6). Tighten the screw to a torque of 50 Nm.
Refit the cone (4), the dog gear (34) and the needle roller bearing (28).
Install the gear (13) and shaft (35) assembly. Check for the presence of the dog clutch sleeve (31).

Position the washer (33) and fit the circlip (32).
In the gear (18), position the spacer (19) and the needle roller bearings (17) (20). Position the double gear assembly (14). Fit the washer (16) smeared with miscible grease (Amber Technical or equivalent).
Ensure that the channels in the pin (23) are not blocked; the channels are used to lubricate the needle roller bearings (17) (20) and the pinion front bearing. Slightly engage the pin (23) in order to hold the washer (16) in place. Position the washer (21) smeared with miscible grease. Centre the double gear assembly (14).
Definitively fit the pin (23) into the gear assembly (14) and in the fork (26) while ensuring the correct positioning of the hole for the set screw (22).
Smear the set screw (22) with Loctite 542. Tighten to a torque of 28 - 43 Nm.
Clean the mating face of the cover plate (10).
Smear the mating face of the housing with a sealing product (Loctite 510 or equivalent).
Check for the presence of the cup (8) and fit the cover plate (10) with the screws (3) and tighten to a torque of 130-170 Nm.

Reconnect the pipes (1) (2).
Fit the locking screw (24) and the nut (25). Adjust the fork (26).
Install the linkage cover plate.
Adjust the economy power take-off PTO control.
Check PTO and PTO brake operation.
Check tightness:
- of the mating faces (spool valve support, cover plate)
- Hydraulic unions

Assembling and adjusting the 4-speed economy PTO control


Move the control lever to the 1550 rpm economy position.
Screw the clevis (1) level with the end of the threaded part of the cable (6).
Install the clevis (1) onto lever L with the clip (7).
Adjust the sheath end (5) so that the nut (3) is level with the end of the threaded part.
Tighten nut (4), ensuring that the cable is not pinched.
Place lever M in the 1550 rpm economy position (sleeve meshed with the dog gear and the fork locked).
Screw the clevis (1) level with the threaded part of the cable (6) and fit it onto lever using the clip (7). Tighten the nut (2).

Adjust the sheath end (5), while checking that lever remains locked.
Tighten the nuts (3) (4) and check that the cable is not pinched.
Check the locking of the control in the 2000 rpm position (b) and check for the correct operation of the indicator light on the instrument panel.