PTO Gearboxes
PTO or Speed up 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 on the apparatus box attaches to the tractor PTO shaft and steps up the PTO speed to one much more suited to the efficient speed of a hydraulic pump. A Gear pump is fitted to the other aspect of the gear box.
The Power Take-Off, mostly referred to by its acronym, PTO, is a common form of mechanical power delivery in the mobile machine marketplace. The PTO is usually a way of transferring high power and torque from the engine (usually via the tranny) of trucks and tractors. In combination with gearboxes and pump mounts, 
nearly any type of mechanical power tranny is possible.
There are three common power take-off methods in the mobile machine market; tractor design, truck transmission style and engine crankshaft-powered, although the latter isn’t commonly known as a PTO. The crankshaft-driven method of power transmission is often used for hydraulic pumps installed to leading of an on-highway truck, such as a plow/spreader or cement mixer. A small shaft with U-joints attaches to a yoke coupler to carefully 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. Many early PTOs were powered from the tranny, which being proudly located behind the tractor, permits easy area of an output shaft. The transmission type of PTO is only engaged when the transmitting clutch is also engaged, and is coupled directly to transmission, to ensure that when the clutch can be depressed, the PTO isn’t driven.
If the transmission is driving the wheels, then your transmission PTO is turning. This also means the put into action can backward-power the transmitting as well when the clutch is definitely depressed, such as down a hill or if the attachment has a mechanism with high rotational inertia, resulting in surging of the drive wheels. This was prevented by the addition of a dedicated overrunning clutch for the PTO, which prevents torque from being applied in the opposite direction.
A live PTO often runs on the transmitting clutch with two phases. The 1st stage of the clutch functions the driven part of the tranny, and the next stage of the clutch handles the engagement of the PTO. This technique enables independent control of the transmission, so that the PTO maintains procedure regardless of transmitting clutch activity, including stopping of the tractor itself. For a tractor with a mower attachment, for instance, this is a minimum 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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