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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 reduction

Glossary “gear reduction” Definition:
Condition in which the drive gear rotates faster than the driven gear. Output speeds of the driven gear is reduced, while output torque is increased.

gear pattern

Glossary “gear pattern” Definition:
Pattern taken off of the ring gear teeth from a coating of colored paste applied to the gear teeth. Shows the contact areas of the ring ring and pinion.

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 noise

Glossary “gear noise” Definition:
The howling or whining of the ring gear and pinion due to an improper gear set pattern, gear damage, or improper bearing preload.

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.

GCWR

Glossary “GCWR” Definition:
Gross Combined Weight Rating. The maximum allowable combined weight of the tow vehicle and the attached towed vehicle. GCWR assumes both vehicles has functioning brakes, with exceptions in some cases for very light towed vehicles, normally less than 1,500 pounds. (check your chassis manual or towing guide) see also WEIGHTS.

GAWR

Glossary “GAWR” Definition:
Gross Axle Weight Rating. Maximum allowable weight each axle is designed to carry, as measured at the tires, therefore including the weight of the axle assemble itself. GAWR is established by considering the weight of each of its components (tires, wheels, springs, axle) and rating the axle on its weakest link. The GAWR assumes that the load is equal on each side.