What is gear?

gear tooth pattern

Glossary “gear tooth pattern” Definition:
With the use of gear marking compound, the gear tooth patterns will appear as marking on both the drive and coast sides of the ring gear tooth. Patterns can be describes as being high or low (deep) and towards the heel or the toe.

gear roll over

Glossary “gear roll over” Definition:
Noise that can be heard with the transmission in neutral and the engine idling. It is caused by the speeding up and slowing down of the crankshaft at idle. This causes the gears to impact one another, causing a rapping noise, this is a normal condition.

gear shift

Glossary “gear shift” Definition:
1). A floor or steering colume mounted lever used to manually change gears in the transmission. 2). Linkage type mechanism by which the gears in a transmission are engaged.

gear rattle

Glossary “gear rattle” Definition:
A repetitive metallic impact or rapping noise that occurs when the vehicle is lugging in gear. The intensity of the noise increases with operating temperature and engine torque, and decreases with increasing vehicle speed.

gear pump

Glossary “gear pump” Definition:
Positive displacement pump that uses an inner drive gear and an outer driven gear, separated on one side by a crescent, to produce oil flow. Gear pumps may use either helical or spur gears and are sometimes called gear-and-crescent pumps.

gear ratio

Glossary “gear ratio” Definition:
1). The speed relationship that exists between a driving (input) and a driven (output) gear. For example, a driving gear that revolves twice for each driven gear revolution has a 2 to 1 (2:1) ratio. 2). The number of turns, or revolutions, made by the drive gear compared to the number of turns made by the driven gear.

gear oil

Glossary “gear oil” Definition:
A thick lubricant, generally with an SAE number of 80 or above, used in standard transmissions or differentials. These often contain additives, such as an EP additive, to guard against being squeezed out from between gear teeth.