PTO Gearboxes
PTO or Speed up gear boxes are primarily used on agricultural tractors where more hydraulic power is required than the system on the tractor can provide.
The quick release coupling on the apparatus box pto gearbox 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 suited to the other aspect of the gear box.
The Power Take-Off, mostly described by its acronym, PTO, is a common form of mechanical power delivery in 
the mobile machine marketplace. The PTO is a way of transferring high power and torque from the engine (generally 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 approach to power transmission is often used for hydraulic pumps installed to leading of an on-highway vehicle, 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 so far as tractors. Many early PTOs were powered from the transmission, which being located at the back of the tractor, allows for 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, so that when the clutch is definitely depressed, the PTO isn’t driven.
If the transmission is driving the wheels, then the transmission PTO is turning. This also means the apply can backward-power the tranny as well when the clutch is definitely depressed, such as for example down a hill or if the attachment has a system with high rotational inertia, resulting in surging of the drive wheels. This was prevented by the addition of a devoted overrunning clutch for the PTO, which prevents torque from getting applied in the opposite direction.
A live PTO often runs on the tranny clutch with two phases. The first stage of the clutch functions the driven portion of the transmission, and the next stage of the clutch handles the engagement of the PTO. This method allows independent control of the transmission, to ensure that the PTO maintains operation regardless of transmitting clutch activity, including stopping of the tractor itself. For a tractor with a mower attachment, for example, 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.