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Old 10-16-2011, 01:26 PM   #1
camaross
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Default What is the role of auxiliary transmission fluid pump

I understand that the role of transmission pump is to provide the pressure needed for gear shift. What is the role of auxiliary transmission pump?
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Old 10-16-2011, 03:40 PM   #2
bgott
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Default Re: What is the role of auxiliary transmission fluid pump

Old cars used to have a rear pump so they could be push started. On a newer car, I've never heard of an auxiliary pump.
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Old 10-16-2011, 03:48 PM   #3
Lotek
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Default Re: What is the role of auxiliary transmission fluid pump

On a hybrid, it provides line pressure to the transmission/electric motor/generator unit when the ICE isn't running.
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Old 10-16-2011, 03:53 PM   #4
theoldwizard1
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Default Re: What is the role of auxiliary transmission fluid pump

The only time I have heard of an auxiliary transmission fluid pump is for use when a vehicle is being "flat towed" (4 wheels down).

When a vehicle is being flat towed, heat builds up in the transmission and because the fluid is not being circulated through the cooler, the fluid overheats or foams. Foaming can be so bad that some of the fluid will come out the fill tube. Either way, the transmission is ruined.

The aux pump circulates the fluid through the cooler. The pump needs to be connected to the tow vehicle (not the TOWED vehicle) or it will kill the battery and still over heat the transmission.
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Old 10-16-2011, 04:31 PM   #5
camaross
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Default Re: What is the role of auxiliary transmission fluid pump

Thanks. This sounds like it is serving a good purpose.


Quote:
Originally Posted by theoldwizard1 View Post
The only time I have heard of an auxiliary transmission fluid pump is for use when a vehicle is being "flat towed" (4 wheels down).

When a vehicle is being flat towed, heat builds up in the transmission and because the fluid is not being circulated through the cooler, the fluid overheats or foams. Foaming can be so bad that some of the fluid will come out the fill tube. Either way, the transmission is ruined.

The aux pump circulates the fluid through the cooler. The pump needs to be connected to the tow vehicle (not the TOWED vehicle) or it will kill the battery and still over heat the transmission.
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Old 10-16-2011, 08:41 PM   #6
bgott
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Default Re: What is the role of auxiliary transmission fluid pump

Two good answers. I think I learned something here today!
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Old 10-16-2011, 08:44 PM   #7
checkthisout
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Default Re: What is the role of auxiliary transmission fluid pump

Quote:
Originally Posted by camaross View Post
I understand that the role of transmission pump is to provide the pressure needed for gear shift. What is the role of auxiliary transmission pump?
In what application?
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