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Tractor Power Take-off (РТО)

The power take-off housing, fitted to the rear of the centre housing, houses all mechanical components of the rear power take-off on the tractors. The power take-off PTO is independent of the transmission.

On tractors fitted with a Heavy gearbox, the input shaft is integral via splines with the vibration damper fixed to the engine flywheel. It transmits the engine speed to the power take-off multidisc clutch via a shaft line comprising two layshafts.

The first layshaft is linked by splines to the engine input shaft and, at the front, to the hydraulic pump drive pinion. The second layshaft is splined at the front on the hydraulic pump drive pinion and at the rear on the power take-off PTO clutch.

On tractors fitted with an AG150 or AG250 Powershift gearboxes, the engine speed is transmitted to the power take-off clutch by a shaft line comprising four shafts.

The first shaft is likewise driven via the vibration damper fitted to the engine flywheel. The second shaft, passing through the gearbox, is linked to the third shaft by a sleeve and drives the hydraulic pump drive pinion.

As in the version mentioned above, the last shaft is splined at the front on the hydraulic pump drive pinion and at the rear on the PTO clutch.

Types of power take-off (PTO) available

"a" : with long or short removable shaft - 540 / 1000 rpm or with an option of 750 / 1000 rpm

"b" : with a jaw coupler and short or long shaft with disc - 540 / 1000 rpm or 750 / 1000 rpm

"c" : with fixed coupler and shaft with disc - 1000 rpm

PTO Type "a"

- the clutch unit is integral via splines with a double pinion that is constantly engaged with the 540 / 1000 rpm or 750 / 1000 rpm pinions that rotate the 1000 rpm shaft or the 750 rpm shaft at the required speed.

PTO Type "b"

- the clutch unit is integral via splines with two pinions that are constantly engaged with the 540 / 1000 rpm or 750 / 1000 rpm pinions that rotate the power take-off РТО output shaft when the coupler is either moved forwards, to the 540 / 1000 rpm position, or rearwards to the 1000 rpm position, depending on the speed required.

PTO Type "c"

- the clutch unit is integral via splines with a single pinion that is constantly engaged with the 1000 rpm pinion that rotates the power take-off PTO output shaft.

- In the type "c", a spacer replaces the 540 or 750 rpm drive pinion. The coupler is integral via splines with the 1000 rpm drive pinion. It is held in place by a snap ring located on the hub. This hub is itself immobilised by another snap ring fitted on the output shaft.

When the clutch is disengaged and the control button in the cab is placed in the PTO brake position, the 17 bar pressure acts upon piston (1) and it enters in contact with the outside edge of unit (6) and thus brakes its rotation.

Construction PTO

The clutch, located on the upper shaftline, is supported by two taper roller bearings. The bearing cups are fitted in two carriers fixed to the power take-off PTO housing and the bearing cones are positioned on two spans inside the clutch housing.

The front bearing cone is force fitted on:

- the clutch unit (PTO type "a")

- the 540 or 750 rpm pinion drive pinion (PTO type "b")

- the spacer (PTO type "c")

The rear bearing cone is mounted free on all types. The bearing clearance is adjusted by means of shims placed between the two carriers.

The lower shaft line comprises:

- A unit fixed by bolts on the rear of the centre housing, in which a roller bearing (type "a" PTO) is fitted. On the other types, this bearing is force fitted, preceded by an oil deflector, in the centre housing.

- A rear bearing comprising two taper roller bearings; their clearance is adjusted by shims placed between the power take-off housing and the bearing.

On the type "a" power take-off, the previously stated bearings are fitted on a sleeve integral with the power take-off output shaft.

- A cassette seal provides oil tightness for the bearing. Depending on the type of power take-off, the type of tool that is to be driven and the recommended rotational speed, the output shafts ((removable or with interchangeable end-piece) may be of different lengths and have 6, 20 or 21 splines.