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Allison trans fluid amount

Posted by Mike on June 24, 2017 at 5:51 am

Oddly a friend (who bought my old 2004 Itasca Meridian) with a Cat C7 and a mh3000 transmission used his shift pad to find his trans fluid level to read 7 quarts low. (Dip stick looked right). After adding 4 quarts and continuing on his way to his camp ground it now reads 8 quarts low.

The trans shows no sign of leaks. Drives and shifts great. – in fact he said it shifted a little smoother after adding the fluid. He had no indicator lights on the dash and temperature ran fine -185-195 degrees.

Can anyone share what symptoms you would see / feel from over filling? It has run well for the last 5k miles before adding this fluid. Previously he had just watched and trusted the dip stick.

It just doesn’t add up that the shift pad has provided such different readings. Is there a calibration required – perhaps a faulty sensor?

Edward & Sandy replied 9 years, 3 months ago 4 Members · 3 Replies
3 Replies

Archived

Member
June 24, 2017 at 7:51 am

Generally if it is over filled it tends to foam and the transmission temps run high.
Edward & Sandy

Member
June 24, 2017 at 9:16 am

I have the same discrepancy comparing dip stick markings with shift pad read outs. I’m way overfilled according to the dip stick but right on the money when checking with the shift pad. So far I’m not relying on the dip stick markings for more than just making sure there is oil in the transmission before I start the engine. That is one heck of a long flexible dip stick; can’t be that accurate.

Could the shift pad sensor be wrong? I do have a small oil leak at the transmission output shaft when driving, none when parked. I put 7 gallons of oil in the transmission last time I changed oil and filters. Is that about right?

Gerald
Harry

Member
June 24, 2017 at 5:29 pm

From what I have learned from Allison dealers is that the stick is a rough reference, but when they want to get accurate the touch pad is what they go by.

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