Manual gear transmission

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50p 123859674 02-07-2012 91 15   Download

When compared to the constant lubrication problems associated with chain drives, or the mechanical problems and high costs associated with gear drives, belts are the most cost-effective, reliable means of power transmission. However, optimum belt drive performance requires proper maintenance. The potential for long service life is built into every Gates belt. When coupled with a regularly scheduled maintenance program, belt drives will run relatively trouble-free for a long time.

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The transmission provides a match between engine speed and vehicle speed. within its optimal performance range regardless of the vehicle load or speed. It provides a gear ratio between the engine speed and vehicle speed such that the engine provides adequate power to drive the vehicle at any speed. To accomplish this with a manual transmission, the driver selects the correct gear ratio from a set of possible gear ratios (usually three to five for passenger cars). An automatic transmission selects this gear ratio by means of an automatic control system.

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The PDC control unit performs a system test after the ignition has been turned on. The parking aid is ready for operation on successful completion of the system test. The parking aid is activated automatically by engaging reverse gear. A delay of approximately 1 second is programmed on both automatic and manual transmission vehicles. The purpose of the delay in activating the PDC when engaging reverse gear on vehicles with an automatic transmission is to prevent unintentional activation of the PDC when passing through the R-position when changing the drive stage.

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