The PTO is a set of variable speed gears, also known as power output, generally by the gearbox, clutch combination, and the gearbox using gear connection, and lift pump is the shaft connection, is a separate gear in the gearbox, hang this gear, a throttle, lift pump can operate. Lifting pump is a hydraulic device, lifting the car box, to achieve self-unloading function. Dump trucks, fire engines truck , cement mixers truck, refrigeration and other special vehicles that require additional power are obtained through a force collector, which is an additional device mounted on the outside of the gearbox (the cement mixer's force is on the clutch housing), which obtains power from one of the gearbox's gears. The connection or disconnect of this power is controlled by an solenoid valve in the cab.

The high pressure oil pump is driven by the force collector, the pump is driven for the fire engine, the compressor is driven for the refrigeration vehicle, and the rotary mixing tank of the hydraulic motor is driven. Force collector is generally connected to the drive shaft or directly connected to the gear pump, in the domestic is generally the transmission shaft, few people design and gear pump direct connection, in Europe, North America, due to the design of the force is diverse, a wide variety. Force manufacturers (e.g. Italy Hydrocar, PZB, USA Muncie, etc.) have designed different interfaces at the actuator output to meet different types of interface requirements. Commonly used output interface forms are: DIN 5462, SAE "B" 2&4, SAE "C" 2&4, etc., the output flange form is generally: DIN20, DIN10, SP1300, SP1400 and so on.

In the European DIN 5462 interface is very common, gear pump manufacturers will be designed according to this interface, in order to perfectly connect with the force, save the Middle drive shaft, reduce space. Most of the domestic force is used in the dump truck, so the requirements for the Force collector are relatively single.

In Europe, North America, due to the special car requirements for the power collector is very high, the force manufacturer will design a multi-output force, or with the clutch of the force, the Force control mode is also diverse, there are: mechanical control, hydraulic control, gas control, vacuum source control, electronic control, among which air control is more common. In recent years, due to the rapid development of China's commercial vehicle market, some international professional force collector manufacturers, such as: Italy pop also landed in China. With the development of time, China's power converters will become more and more diversified, professional. 

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