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These three components are important in the non-computerized transmissions. They provide the inputs that tell the transmission when to shift. The Governor is connected to the output shaft and regulates hydraulic pressure based on vehicle speed. It accomplishes this using centrifugal force to spin a pair of hinged weights against pull-back springs. As the weights pull further out against the springs, more oil pressure is allowed past the governor to act on the shift valves that are in the valve body which then signal the appropriate shifts.
Of course, vehicle speed is not the only thing that controls when a transmission should shift, the load that the engine is under is also important. The more load you place on the engine, the longer the transmission will hold a gear before shifting to the next one.
There are two types of devices that serve the purpose of monitoring the engine load: the Throttle Cable and the Vacuum Modulator. A transmission will use one or the other but generally not both of these devices. Each works in a different way to monitor engine load.
The Throttle Cable simply monitors the position of the gas pedal through a cable that runs from the gas pedal to the throttle valve in the valve body.
The Vacuum Modulator monitors engine vacuum by a rubber vacuum hose which is connected to the engine. Engine vacuum reacts very accurately to engine load with high vacuum produced when the engine is under light load and diminishing down to zero vacuum when the engine is under a heavy load. The modulator is attached to the outside of the transmission case and has a shaft which passes through the case and attaches to the throttle valve in the valve body. When an engine is under a light load or no load, high vacuum acts on the modulator which moves the throttle valve in one direction to allow the transmission to shift early and soft. As the engine load increases, vacuum is diminished which moves the valve in the other direction causing the transmission to shift later and more firmly.
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∙ 12y ago
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Why do they use spur cut gears in performance transmissions?
They don't. Most racing trans have straight cut gears. Spur cuts are a little easier to shift.
What causes the gears in a Mercedes Benz A class 160 automatic gearbox to slip and not shift up to higher gears?
One of the most common causes of gears in a Mercedes Benz A class 160 automatic gearbox to slip and not shift up to higher gears is a bad transmission. If the transmission is failing, or not working properly, you won't get the gears to shift up.
Why does a car have transmission but a bicycle doesn't?
Cars have transmissions so they can shift gears, a bike's transmission is the gears that change your speed. The lower the gear you're in, the faster you peddle.
Why does a car have a transmission but a bicycle doesn't?
Cars have transmissions so they can shift gears, a bike's transmission is the gears that change your speed. The lower the gear you're in, the faster you peddle.
Do electric train motors have gears and transmissions?
No, the electric train are gearless. They do not have have gears in their transmissions.
What causes the gears in a Mercedes A160 automati gearbox to slip and not shift up to higher gears?
There can be several causes for the gears in a Mercedes A160 automatic gearbox to slip and not shift up to higher gears. One of the main causes is a leak in the intake. This could be a leak from a connection, or even a case of the intake bolts not tightened enough.
Your 67 Mustang 289 has no transmission dip stick What do you do?
Use the clutch and shift the gears. Manual transmissions don't have dip sticks.
What is the benefit of fitting a straight cut gearbox?
none. Henry fords engineers found that helical cut gears for transmissions ran much quieter and the transmissions were easier to shift. The same year that ford went to helical cut gears they added syncromesh to the transmission.
What causes a man not to be able to nut?
what can cause your car not to shift gears besides the transmission
What is sport mode in automatic transmissions?
Sports mode changes both the shift points(increases the rpm) and the firmness of the shift(decreasing the amount of time it takes to shift gears), thus increasing acceleration performance of said vehicular object. :)
What causes the automatic transmission in a 1996 gran prix not to shift gears?
could it be low fluid
What do you think operates with gears?
Transmissions of all kinds.
