D6t torque convertor failure analysis

[Nige]

Just curious what the drain test procedure/spec is. I am having a similar issue

What model of machine are you dealing with.?
There isn’t really a spec per se but someone will at least be able to give you an idea.

 

[CRR]

D6T. KJL01024

 

[Nige]

So here's my swing at it. As I said earlier there is no spec that I'm aware of. You'll need a few bodies to do this test. Two as a minimum but an extra one ot two probably wouldn't hurt. Whoever is under the machine during the test needs to be well aware that the machine could potentially move.

1. Run the machine and warm up both the engine & transmission oil to normal operating temperature. Stop the engine.
2. Remove the plug from the bottom of the converter housing and drain all the accumulated oil from it. Leave the drain plug out.
3. Place an empty bucket under the converter. Make a mark in it that approximates to around 8-10 quarts.
4. Start the engine and immediately shift the transmission into 3rd speed.
5. Stall the converter against the brakes with the governor control at the max setting.
6. Measure the time taken for the measured amount of oil from Step 3 to dump into the bucket. Shift to neutral, shut down, and replace the drain plug.

 

[Simon C]

So here's my swing at it. As I said earlier there is no spec that I'm aware of. You'll need a few bodies to do this test. Two as a minimum but an extra one ot two probably wouldn't hurt. Whoever is under the machine during the test needs to be well aware that the machine could potentially move.

1. Run the machine and warm up both the engine & transmission oil to normal operating temperature. Stop the engine.
2. Remove the plug from the bottom of the converter housing and drain all the accumulated oil from it. Leave the drain plug out.
3. Place an empty bucket under the converter. Make a mark in it that approximates to around 8-10 quarts.
4. Start the engine and immediately shift the transmission into 3rd speed.
5. Stall the converter against the brakes with the governor control at the max setting.
6. Measure the time taken for the measured amount of oil from Step 3 to dump into the bucket. Shift to neutral, shut down, and replace the drain plug.

What an easy way to do a live convertor test with tangible results. Hard to argue with what is in the pail. So does Cat have a spec., for how many quarts in 30 seconds or 1 minute.
Thanks for sharing.
Simon C

 

[Nige]

What an easy way to do a live convertor test with tangible results. Hard to argue with what is in the pail. So does Cat have a spec., for how many quarts in 30 seconds or 1 minute.
Thanks for sharing.
Simon C

It's all anecdotal handed down through the ranks over the years AFAIK. There is no spec and it all depends on how big the converter is. The leakage on a D6 converter would be expected to be far less than that on a D11. Another thing to look at is the size of the oil stream falling out of the drain plug hole. if it looks as though the oil is "backing up" in the converter housing it's leaking too much internally.

 

[Simon C]

It's all anecdotal handed down through the ranks over the years AFAIK. There is no spec and it all depends on how big the converter is. The leakage on a D6 converter would be expected to be far less than that on a D11. Another thing to look at is the size of the oil stream falling out of the drain plug hole. if it looks as though the oil is "backing up" in the converter housing it's leaking too much internally.

Its kind of what I thought as when I worked at Finning in McMurray on D11N,R they are a whole lot more torque than a D6,7. If a heavy stream probably has some heavy wear inside.
Easy enough to compare one from another if you have 2 machines.
Thanks
Simon C

 

[chidog]

The part with the crack? What is the material, and wall thickness? Its more like a high stress point is the reason.

 

[D5Dan]

Nige your test/steps in post 23 jogged my memory I had seen a video of a guy doing the bucket test (on old D8)…the difference is it appeared he was by himself, which meant he had to do the test based on time (1 minute at stall) to then see what he had in the bucket.
I suspect your test is smarter since the machine won’t lose as much oil given the observer can wave off the test once the bucket is half full…

If you start at the 26-27 minute mark he shows the test. Certainly a quick way to fill a 5-gallon bucket!!!

 

[Vetech63]

Nige your test/steps in post 23 jogged my memory I had seen a video of a guy doing the bucket test (on old D8)…the difference is it appeared he was by himself, which meant he had to do the test based on time (1 minute at stall) to then see what he had in the bucket.
I suspect your test is smarter since the machine won’t lose as much oil given the observer can wave off the test once the bucket is half full…

If you start at the 26-27 minute mark he shows the test. Certainly a quick way to fill a 5-gallon bucket!!!

She should have an apron on and holding a pan of cookies.