PTO Gearboxes
PTO or Speed up gear boxes are mainly 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 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, mostly described by its acronym, PTO, is a common form of mechanical power delivery in the mobile machine market. The PTO can be a way of transferring high power and torque from the engine (generally via the transmission) of trucks and tractors. In combination with gearboxes and pump mounts, almost any kind of mechanical power tranny is possible.
There are three common power take-away methods in the mobile machine market; tractor design, truck transmission style and engine crankshaft-powered, although the latter is not commonly referred to as a PTO. The crankshaft-driven method of power transmission is often used for hydraulic pumps mounted to the front of an on-highway pickup 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 isn’t generally referred to as a PTO, however.
The tractor PTO goes back pretty much as far as tractors. Many early PTOs were driven from the transmitting, which being proudly located behind the tractor, allows for easy area of an result shaft. The transmission type of PTO is engaged when the transmitting clutch is also engaged, and is definitely coupled directly to transmission, so that when the clutch can be depressed, the PTO isn’t driven.
If the transmission is driving the wheels, then the transmission PTO is turning. This also means the put into action can backward-power the transmission as well when the clutch can be depressed, such as down a hill or if the attachment has a system with high rotational inertia, leading to surging of the drive tires. This was prevented by the addition of a devoted overrunning clutch for the PTO, which prevents torque from getting applied in the contrary direction.
A live PTO often runs on the transmission clutch with two phases. The initial stage of the clutch works the driven part of the transmission, and the second stage of the clutch regulates the engagement of the PTO. This method enables independent control of the transmission, so that the PTO maintains procedure regardless of tranny clutch activity, which includes stopping of the tractor itself. For a tractor with a mower attachment, for instance, this is a minimum pto gearbox requirement; you can’t have the mower turn off when you feather the clutch up a hill and around a tree.