Existing power take-off PTO types


- The PTO drive mechanism is fitted in the rear part of the axle, behind the differential. The gear assembly rests on tapered roller bearings supported by the axle housing at the front and by the PTO cover plate at the rear.
- The assembly is driven by the engine via a shaft that passes through the gearbox primary shaft.

Clutch
- The clutch is located on the upper power take-off shaftline at the front of the centre housing.
- It is supported by two bearings fitted in the housing.

Upper shaftline
- The power take-off PTO upper shaftline transmits drive from the engine to the driving gears, either directly or via a dog clutch/sliding sleeve allowing the economy speeds to be selected (depending on version).
- The system mainly consists of 2 shafts (3 if economy version):
- Input shaft
- Secondary shaft
- Intermediate shaft (if economy version)

Standard power take-off PTO
The input shaft drives a double gear, which transmits the drive to two gears on the secondary shaft. The PTO speed is selected by connecting one of these two gears to the secondary shaft via internal splines or by engaging the dog clutch (depending on option).

Standard and economy power take-off PTO
The input shaft drives:
- either a double gear via the dog clutch/sleeve sliding forwards, which transmits the drive like the standard PTO,
- or a series of idle-mounted gears driving the double gear when the dog clutch/sleeve is slid backwards. Drive speed is therefore multiplied, allowing the PTO speeds to be obtained at an engine speed of 1550 rpm.
- The bearings supporting the driving gear shaft are adjusted with clearance using one or more shims inserted between the rear cup and the removable cover plate.
- An internal channel system carries lubricating oil to the bearings and the driving gears via an oil gallery in the housing and the radial bores in the shaft.

Lower shaftline
- The lower shaftline is supported at the front by a bearing force fitted into the housing, and at the rear by a bearing.
- The lower shaftline output shaft is lubricated at the front bearing by a deflector and by radial bores in the output shaft.
- The shaft is sealed by a lip seal fitted into the rear cover plate of the housing.
- The PTO shaft type may differ, depending on the model:

Removable power take-off PTO
the shaft can be removed by removing a circlip. Two shafts are available; each one corresponds to a different PTO speed (540/1000rpm). The splines of these shafts match with the splines of the 540 and 1000 rpm gears. Each shaft is driven by the gear that corresponds to its operating speed.

Shiftable power take-off PTO
the 540 and 1000 rpm gears are idle-mounted on the PTO shaft. The speed is selected using a dog clutch situated between the two gears. Depending on the option, the shaft may be a flanged shaft holding an end fitting with 6 or 21 splines, or a non-removable shaft comprising a number of fixed splines.

PTO brake
- The rear power take-off is equipped with a brake located in the rear housing.

Proportional PTO
- The proportional PTO is driven by a shaft coupled to the front axle clutch by a sliding sleeve. This shaft then drives the 540 rpm gear on the lower shaftline.
- The sleeve sliding on the splines secures the front axle clutch shaft or allows it to rotate freely.

Existing power take-off PTO types


Removable PTO
- The drive shaft is secured to the double driving gear.
- The ratio is selected by changing the power take-off PTO output shaft, which is provided either with splines to be driven by the 540 rpm gear or with splines to be driven by the 1000 rpm gear. When the 1000 rpm gear drives the shaft, the 540 rpm gear turns idle on the shaft.
- The shaft used for the 540 rpm speed has 6 splines. The shaft used for the 1000 rpm speed has 21 splines.
- The PTO brake acts on the rear bearing cup of the double driving gear.

Shiftable PTO
- The drive shaft, connected to the PTO clutch, is attached to a sleeve/dog clutch which selects the standard or economy speeds.
- The double driving gear drives both the 540 and 1000 rpm gears. These gears are then secured to the PTO output shaft by a dog clutch.
- The PTO brake acts on the rear bearing cup of the double driving gear.

Shiftable PTO and flanged shaft
- The operation is the same as for the shiftable PTO.
- The power take-off PTO output shaft has an interchangeable end fitting to adapt the number of splines to the hitched implement (6 or 21 splines).

Economy PTO
- Economy power take-off PTO mode is selected by moving a sleeve/dog clutch. The drive is no longer transmitted directly to the double gear, but passes via an idler gear.
- The ratio of the additional double gear allows the PTO speeds to be obtained when the engine speed is 1550 rpm.

Proportional PTO
- The proportional PTO drive is obtained via the front axle clutch. A sleeve sliding on the splines secures the front axle clutch bell housing. Drive is transmitted to the 540 rpm PTO gear. For 2WD tractors equipped with a creeper unit, a gear is fitted in place of the front axle clutch.
- The speed of the power take-off PTO output shaft is then proportional to the tractor forward speed.

PTO with reinforced sealing
- This type of PTO has reinforced sealing at the PTO output shaft.
- The output shaft turns at the rear on two tapered roller bearings. A seal is fitted behind these bearings.
- The PTO operates in exactly the same way as the other shiftable versions.