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| Illustration 1 | g00544962 |
Power take-off clutch (typical example) (1) Ring. (2) Driven disc. (3) Link assemblies. (4) Lever. (5) Key. (6) Collar assembly. (7) Nut. (8) Yoke assembly. (9) Hub. (10) Plate. (11) Output shaft. | |
The power take-off clutch (PTO) is used to send power from the engine to the accessory components. A PTO can be used to drive an air compressor. A PTO can also drive a water pump.
The PTO is driven by a ring (1). The ring has spline teeth around the inside diameter. The ring can be connected to the front of the engine crankshaft or to the rear of the engine crankshaft. The ring (1) is connected to the crankshaft by an adapter.
Note: A PTO that is located at the rear of the engine could have ring (1) as part of the flywheel.
The spline teeth on the ring (1) engage with the spline teeth on the outside diameter of driven discs (2). As lever (4) is moved to the "ENGAGED" position, yoke assembly (8) moves collar assembly (6) in the direction of the engine. The collar assembly is connected to four link assemblies (3). The action of the link assemblies will hold the faces of driven discs (2), plates (10) and hub (9) together.
Friction between these faces permits the flow of torque from ring (1). Then, the flow of torque travels through driven discs (2) to plates (10) and to hub (9). Spline teeth on the inside diameter of the plates drive the hub (9). The hub (9) is held in position on the output shaft (11) by a taper, nut (7) and key (5) .
Note: A PTO can have one to three driven discs (2) with a respective number of plates.
As lever (4) is moved to the "NOT ENGAGED" position, yoke assembly (8) moves collar assembly (6) to the left. The movement of the collar assembly (6) will release link assemblies (3). Once the link assemblies are released, there will not be enough friction between the faces of the clutch assembly. There will be no flow of torque.