2-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.

2-speed PTO
When the button is pressed and turned clockwise, the PTO solenoid valve supplies the clutch and the intermediate shaft (2) is driven. The shaft in turn drives the double driving gear (13) which is in permanent contact with the 540 rpm and 1000 rpm gears on the lower shaftline.



2-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  (15) Deflector  (22) Set screw  (36) Pin  (37) Seal



2-speed PTO (without shimming)


Remove the hitch support and top link support.
Remove:
- the trailer electrical connector (1)
- the spool valve control cables (2)
- the hydraulic unions connected to the spool valves (3)
- the trailer brake connector (if fitted) and its support, by undoing the unions at both ends.
Take out the spool valve support screws and remove the spool valve support.
Disconnect the power take-off brake supply pipe (1).
Disconnect the lubrication pipe (2).
Remove the 6 screws (3) and the cover plate (10).
Take out the gear (13) and shaft (2) assembly held in place by the washer (5) and the screw (6). Remove the cone (4). The shaft (2) is fitted into the clutch (1) without a locking screw.

Check and clean the components. Replace any defective parts.
Install the cone (4). Fit the gear (13) and shaft (2) assembly held by the washer (5) and the screw (6).
Clean the mating face of the cover plate (10).
Smear the mating face of the housing with a sealing product (Loctite 510 or equivalent). In order to ensure lubrication of the cone (7), a pin (36) fixed by a set screw (22) is fitted at the location of the pin (23) in the 4-speed economy power take-off PTO. The pin is sealed by the seal (37), the central channel in the pin is used to lubricate the pinion front bearing.
Install the cover plate (10). Tighten the 6 screws (3) to a torque of 130 - 170 Nm. Check for the presence of the cup (8).

Reconnect the power take-off brake supply pipe (1) and the lubrication pipe (2).
Clean the mating face of the spool valve support.
Smear the mating face of the spool valve support with a sealing product (Loctite 510 or equivalent).
Install the support. Smear the thread of the two lower screws with Loctite 510. Fit and tighten them to a torque of 50-70 Nm.
Check PTO and PTO brake operation.
Check tightness:
- of the mating faces (spool valve support, cover plate)
- Hydraulic unions

2-speed PTO (with shimming)


The shimming (preload or clearance of 0.05) is to be carried out when working on the following components: the gear (13), the deflector (15), the bearing cones (4) (7) and the cups (3) (8); the linkage cover plate must be removed. 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 hitch support and top link support.
Disconnect the power take-off PTO brake supply pipe (1) and the lubrication pipe (2).
Remove the screws (3) from the cover plate (10) and remove the cover plate.
Take out the gear (13) and shaft (2) assembly held by the washer (5) and the screw (6). The shaft (2) is fitted into the clutch (1) without a locking screw.
Remove the screw (6) and the washer (5).
Separate the gear (13) from the shaft (2). A deflector (15) is fitted between the gear (13) and the bearing cone (7) in contact with the bearing cup (8).
Extract the cone (7) and the deflector (15) and then remove the cone (4). To extract the cup (3), the 540/1000 rpm gears must be removed. Partially drain the rear axle housing.

Check and clean the components. Replace any defective parts.
Install the deflector (15) on the gear (13), and press-fit the bearing cone (7) fully home into the shoulder.
Lubricate the cone (4) and fit it in the cup (3). If the cup (3) has been replaced, refit the 540/1000 rpm gears (see chapter 7). Top up the rear axle oil level.
Take the piston (9) out through the cover plate (10).
Remove the shims (11) and the "O" ring (12) to prepare for the shimming operation.
Install the piston (9) and the cup (8) into the cover plate (10).
Lubricate the bearing cup and the bearing cone (7).
Install the gear (13) in the housing. In order to ensure lubrication of the cone (7), a pin (36) fixed by a set screw (22) is fitted at the location of the pin (23) in the 4-speed economy PTO. The pin is sealed by the seal (37), the central channel is used to lubricate the pinion front bearing.
Install the cover plate. Tighten the screws to a torque of 130-170 Nm.
Carry out the J/P shimming to obtain a preload of 0.05 with a clearance of 0.05.

Place the dial gauge at the end of the gear (13)
Pull on the gear while turning it alternately left and right in order to compress the deflector (15) and correctly "seat" the cone (7) in the cup (8).
Set the dial gauge to zero.
Push on the gear while turning it alternately left and right in order to "seat" the cone (4) correctly in the cup (3).
According to the value read on the dial gauge, select the thickness of shims in order to obtain J/P.
Remove the cover plate (10) and take out the cup (8) and the piston (9).
Install the shims (11) selected during step 41 in the cover plate (10).
Install the piston (9) with a new "O" ring (12). Turn the lubricating holes on the piston towards the bearing.
Install the cup (8) into the support.
Take out the gear (13) and assemble it with the shaft (2), the washer (5) and the screw (6). Tighten to a torque of 50 Nm.

Install the cone (4). Fit the gear (13) and shaft (2) assembly.
Smear the mating face of the cover plate (10) on the rear axle housing with a sealing product (Master joint 510 or equivalent).
Install the cover plate (10). Fit and tighten the screws (3) to a torque of 130-170 Nm. Check for the presence of the cup (8).
Reconnect the power take-off brake supply pipe (1) and the lubrication pipe (2).
Install the linkage cover plate. Refit the hitch support.
Check PTO and PTO brake operation.
Check tightness:
- of the mating faces (spool valve support, cover plate, linkage cover plate)
- Hydraulic unions