Gear motors operate in the reverse way to gear pumps. The driven and the idler gear receive pressurised fluid from the inlet port and circulate it around to the outlet port. The fluid is used at the same time as a form of lubrication.
Lubrication is also provided by the oil that bleeds through a bearing or drain port to the low-pressure side of the pump.
Gear motors make an ideal choice in a wide range of applications, including industrial, agricultural and construction. They can handle high back pressure and extremely low system pressure, making them a popular motor.
The secure meshing of the gears prevents backflow of the fluid. Gear motors do not generally stop abruptly, generally deteriorating over time instead, this means that you are not left with a sudden, expensive failure.