PTO Gearboxes
PTO or Increase gear boxes are primarily used on agricultural tractors where more hydraulic power is necessary than the system on the tractor can provide.
The quick release coupling upon the gear box attaches to the tractor PTO shaft and steps up the PTO speed to one much more suitable for the efficient speed of a hydraulic pump. A Gear pump is suited to the other aspect of the apparatus box.
The Power Take-Off, mostly described by its acronym, PTO, is a common kind of mechanical power delivery in the mobile machine market. The PTO is certainly a way of transferring high power and torque from the engine (usually via the transmitting) of trucks and tractors. In mixture with gearboxes and pump mounts, almost any type of mechanical power transmitting is possible.
There are three common power take-off methods in the mobile machine market; tractor style, truck transmission style and engine crankshaft-powered, although the latter is not commonly referred to as a PTO. The crankshaft-driven approach to power transmission is often used for hydraulic pumps installed to leading of an on-highway vehicle, like a plow/spreader or cement mixer. A small shaft with U-joints attaches to a yoke coupler to turn the pump. This configuration of drive isn’t generally referred to as a PTO, however.
The tractor PTO dates back pretty much as far as tractors. The majority of early PTOs were driven from the transmission, which being located behind the tractor, permits easy location of an output shaft. The transmission kind of PTO is only engaged when the tranny clutch can be engaged, and is definitely coupled right to transmission, so that when the clutch is depressed, the PTO isn’t driven.

If the transmission is driving the wheels, then the transmission PTO is turning. This does mean the implement can backward-power the transmitting aswell when the clutch is definitely depressed, such as down a hill or if the attachment includes a mechanism with high rotational inertia, resulting in surging of the drive tires. This was prevented by the addition of a dedicated overrunning clutch for the PTO, which prevents torque from becoming applied in the opposite direction.

A live PTO often uses a transmission clutch with two levels. The initial stage of the clutch works the driven portion of the transmitting, and the next stage of the clutch handles the engagement of the PTO. This method allows independent control of the transmission, so that the PTO maintains operation regardless of transmission clutch activity, including stopping of the tractor itself. For a tractor with a mower attachment, for example, this is the very least requirement; you can’t have the mower turn off when you feather the clutch up a hill and around a tree.

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