Tranny fluid pump
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Senior User
Joined: Nov 2005
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From: Heber UT
Tranny fluid pump
Is the tranny fluid pumped through the tranny cooler by a seperate pump?
I unpluged the hoses to my tranny cooler with the engine running and nothing is coming out of either hose.
I unpluged the hoses to my tranny cooler with the engine running and nothing is coming out of either hose.
Not a liberal...
Joined: Jul 2006
Posts: 6,635
Likes: 4
From: Cut & Shoot, Texas
I do not think that it is a seperate pump. The reason why I say this is because of this testing procedure that I read at DieselSite not too long ago when I was shopping for a cooler.
This is the test procedure to determine if your bypass valve has gone south or not. You can also use it to check the operation of the pump.
TESTING:
Bring the transmission up to temperature. It needs to be at least 100 degrees for this test.
Turn the truck off.
Remove the rear line from the transmission and place it into a bucket or similar container so that you can measure volume of your flow.
Have someone turn the truck on.
At idle (in park), you should measure 32 ounces of fluid in your bucket - in 15 seconds or less. This is an absolute minimum number. A properly working transmission will flow that amount in about 10 seconds or less. You should not see ANY fluid pumping out of the rear transmission port.
TEST RESULTS:
If you have the proper amount of flow, your transmission pump and coolers are working fine. SO, if you are running hot and have the proper flow (with no fluid coming out of the rear transmission port), you most likely have a mechanical problem causing high heat. This could be torque converter slippage or one of many other internal problems. You may have to see a professional at this point to help diagnose the problem.
If you do not have proper flow, OR you have fluid coming out of the transmission rear port, you either have a cooler blockage, OR a faulty cooler bypass valve. Here's how to tell.
Trace the forward transmission line to the front of the truck.
Remove the line from the 1st place it enters a cooler or the radiator (if so equipped).
Now, do the same flow test checking flow at this point.
There are two outcomes.
The first is that you now have enough fluid flow- this means your cooler /coolers are partially blocked. To determine which cooler is plugged you would perform the same flow test through one cooler at a time.
The second outcome will be that you don't have enough flow even with all coolers disconnected. This means you have an internal pump problem.
IMPORTANT! The outcome of this test assumes that you have NO fluid exiting the rear port of the transmission. If you perform a flow test with the coolers disconnected and you get fluid from the rear port on the transmission, your cooler bypass valve is bad.
This is the test procedure to determine if your bypass valve has gone south or not. You can also use it to check the operation of the pump.
TESTING:
Bring the transmission up to temperature. It needs to be at least 100 degrees for this test.
Turn the truck off.
Remove the rear line from the transmission and place it into a bucket or similar container so that you can measure volume of your flow.
Have someone turn the truck on.
At idle (in park), you should measure 32 ounces of fluid in your bucket - in 15 seconds or less. This is an absolute minimum number. A properly working transmission will flow that amount in about 10 seconds or less. You should not see ANY fluid pumping out of the rear transmission port.
TEST RESULTS:
If you have the proper amount of flow, your transmission pump and coolers are working fine. SO, if you are running hot and have the proper flow (with no fluid coming out of the rear transmission port), you most likely have a mechanical problem causing high heat. This could be torque converter slippage or one of many other internal problems. You may have to see a professional at this point to help diagnose the problem.
If you do not have proper flow, OR you have fluid coming out of the transmission rear port, you either have a cooler blockage, OR a faulty cooler bypass valve. Here's how to tell.
Trace the forward transmission line to the front of the truck.
Remove the line from the 1st place it enters a cooler or the radiator (if so equipped).
Now, do the same flow test checking flow at this point.
There are two outcomes.
The first is that you now have enough fluid flow- this means your cooler /coolers are partially blocked. To determine which cooler is plugged you would perform the same flow test through one cooler at a time.
The second outcome will be that you don't have enough flow even with all coolers disconnected. This means you have an internal pump problem.
IMPORTANT! The outcome of this test assumes that you have NO fluid exiting the rear port of the transmission. If you perform a flow test with the coolers disconnected and you get fluid from the rear port on the transmission, your cooler bypass valve is bad.
Posting Guru
Joined: Jul 2003
Posts: 2,210
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Originally Posted by dryfly
I do believe the tranny needs to be in gear in order for the pump to operate.You should not get flow if the tranny is in neutral or park.Someone correct me if I'm wrong.
The pump runs anytimke the engine is running.
If there is no flow, the cooler is probably plugged, and/or the cooler bypass is stuck open. Try blowing through the cooler lines. Air should flow very easily.
The bypass is in the tube on the passenger's side of the trans that connects the two cooler line fittings. I'd just replace it. They don't cost that much and they do fail.
Elder User
Joined: Jun 2007
Posts: 853
Likes: 1
I stand corrected.sorry for the bad info,I was always under that impression for some reason.Thank you for clearing that up Casey
Originally Posted by Casey
You're wrong.
The pump runs anytimke the engine is running.
If there is no flow, the cooler is probably plugged, and/or the cooler bypass is stuck open. Try blowing through the cooler lines. Air should flow very easily.
The bypass is in the tube on the passenger's side of the trans that connects the two cooler line fittings. I'd just replace it. They don't cost that much and they do fail.
The pump runs anytimke the engine is running.
If there is no flow, the cooler is probably plugged, and/or the cooler bypass is stuck open. Try blowing through the cooler lines. Air should flow very easily.
The bypass is in the tube on the passenger's side of the trans that connects the two cooler line fittings. I'd just replace it. They don't cost that much and they do fail.
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Here's the part:
http://www.dieselsite.com/index.asp?...ROD&ProdID=172.
It seems very straight forward and easy to do.
http://www.dieselsite.com/index.asp?...ROD&ProdID=172.
It seems very straight forward and easy to do.
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