PTO Gearboxes
PTO or Speed up gear boxes are mainly applied to agricultural tractors where more hydraulic power is required than the program on the tractor can provide.
The quick release coupling on 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 fitted to the other part of the apparatus box.
The Power Take-Off, most commonly described by its acronym, PTO, is a common kind of mechanical power delivery in the mobile machine market. The PTO is definitely a method of transferring high power and torque from the engine (generally via the transmission) of trucks and tractors. In mixture with gearboxes and pump mounts, almost any kind of mechanical power transmission is possible.
There are three common power take-off methods in the mobile machine market; tractor design, truck transmission design and engine crankshaft-powered, although the pto gearbox latter is not commonly referred to as a PTO. The crankshaft-driven method of power transmission is often used for hydraulic pumps installed to the front of an on-highway truck, 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 is not generally referred to as a PTO, however.
The tractor PTO goes back pretty much as far as tractors. The majority of early PTOs were driven from the transmitting, which being proudly located at the back of the tractor, allows for easy location of an output shaft. The transmission type of PTO is only engaged when the tranny clutch is also engaged, and is usually coupled right to transmission, so that when the clutch is definitely depressed, the PTO isn’t driven.
If the transmission is driving the wheels, then your transmission PTO is turning. This does mean the apply can backward-power the tranny aswell when the clutch is depressed, such as for example down a hill or if the attachment includes 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 becoming applied in the opposite direction.
A live PTO often uses a transmitting clutch with two phases. The initial stage of the clutch operates the driven part of the transmitting, and the next stage of the clutch controls the engagement of the PTO. This technique allows independent control of the transmitting, 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 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.