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Old 02-16-2014, 10:41 AM   #1
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Overfilled Transmission leaking

I discovered that my Allison 1000 transmission is leaking after mountain driving from Yuma to El Cajon CA.. The cold fluid level is just below the the hot hash marks. Checking again after a short trip to dump and with the transmission temp approx 115 the level is 1/2" above the hot hash marks. I had the fluid changed 2,800 miles ago in Holland MI. They may have overfilled. I can't pinpoint the leak but the drips are from the front pan bolts and from the drive shaft carrier at the rear of the transmission. The tranny temp did not go above 180 on the mountain grades. Not sure how long it has been leaking as this is the first time the coach has been parked on payment since leaving MI.
The nearest certified Allison service is 30 miles away but a recommanded local transmission service is nearby. Not sure about a course of action. Any feed back?
Thanks.
Jack H
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Old 02-16-2014, 10:57 AM   #2
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IF IT IS OVER full then it will leak out the over flow tube on top of the tranny. I would say get it serviced as soon as you can over filling can hurt a tranny just as bad as under filling. hope this helps.
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Old 02-16-2014, 12:14 PM   #3
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I have to assume you are checking it with the engine running, the brake set and the shift lever in Park?

Who did the change? Were they familiar with the Allison 1000? I change my own and you do not drop the pan. There is a drain plug just like your engine oil has.

Did they change the spin on transmission filter cartridge?
That should be changed after the first 5,000 miles. It too looks like a regular oil filter except it is orange. I change mine at every fluid change

The fact your pan is leaking makes me wonder if they dropped the pan. Allison says never to do that unless you are repairing the transmission.
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Old 02-16-2014, 02:36 PM   #4
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My thoughts go along with an over serviced condition. The fact that you got a over serviced indication after a short drive would back that up. The unit should be driven at some length to bring the temp up to operating range.

BTW, how are you measuring your transmission temp? On my unit 175-180 degrees are normal flat land temps, possibly lower winter OAT is keeping your temps down.

When my transmission was over-serviced, it blew fluid out the top breather.

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Old 02-18-2014, 10:59 AM   #5
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More info. Temperature from Scan gauge. Checked with engine running cold and warm (110-115). Drip from pan bolts could be runoff. Conserned that if the fluid came from breather why still leaking? Holland Motor home did service. (second change) and will "help with cost".
Have appointment tomorrow at Valley trans here in El Cajon. Will have them drain overfill and give diagnosis. Repair will have to be at Allison Service center.

Thanks for your feed back.
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Old 02-18-2014, 01:11 PM   #6
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Just out of curiosity, have you switched to TranSynd?

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Old 02-18-2014, 01:25 PM   #7
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Quote:
Originally Posted by Arch Hoagland View Post
I have to assume you are checking it with the engine running, the brake set and the shift lever in Park?

Who did the change? Were they familiar with the Allison 1000? I change my own and you do not drop the pan. There is a drain plug just like your engine oil has.

Did they change the spin on transmission filter cartridge?
That should be changed after the first 5,000 miles. It too looks like a regular oil filter except it is orange. I change mine at every fluid change

The fact your pan is leaking makes me wonder if they dropped the pan. Allison says never to do that unless you are repairing the transmission.
I agree with Arch.
I would go to an authorized Allison Facility. If the facility that did the work is also an Authorized Dealer, that may help with warrantee and cost to solve the problem. If you use TranSynd, the fluid is good for 5 years or 50K miles.
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Old 02-18-2014, 01:29 PM   #8
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Quote:
Originally Posted by Fred and Bonnie View Post
Just out of curiosity, have you switched to TranSynd?

Fred
Yes. 2 changes 15k apart.
Thanks.
Jack H
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Old 02-18-2014, 01:49 PM   #9
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I would post your question and concerns over on the Allison Category where Tom Johnson hangs out who is Mr. TranSynd and retired from Allison.

Allison Transmission Forum - iRV2 Forums

I am sure you will get the best recommendation from him.

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Old 02-18-2014, 01:57 PM   #10
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Quote:
Originally Posted by Dr4Film View Post
I would post your question and concerns over on the Allison Category where Tom Johnson hangs out who is Mr. TranSynd and retired from Allison.

Allison Transmission Forum - iRV2 Forums

I am sure you will get the best recommendation from him.

Dr4Film ----- Richard
Thanks. I first posted on the Allison forum.
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Old 03-09-2014, 03:14 PM   #11
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Update

Quote:
Originally Posted by chili's trip View Post
I discovered that my Allison 1000 transmission is leaking after mountain driving from Yuma to El Cajon CA.. The cold fluid level is just below the the hot hash marks. Checking again after a short trip to dump and with the transmission temp approx 115 the level is 1/2" above the hot hash marks. I had the fluid changed 2,800 miles ago in Holland MI. They may have overfilled. I can't pinpoint the leak but the drips are from the front pan bolts and from the drive shaft carrier at the rear of the transmission. The tranny temp did not go above 180 on the mountain grades. Not sure how long it has been leaking as this is the first time the coach has been parked on payment since leaving MI.
The nearest certified Allison service is 30 miles away but a recommanded local transmission service is nearby. Not sure about a course of action. Any feed back?
Thanks.
Jack H
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This is a follow up to leaking problem of the Allison transmission in my 2005 Fleetwood Bounder. I had the leak diagnosed by Inland Kenworth El Cajon CA a certified Aliison service center. ($155) They determined that Transmission was over filled and drained 1.5 qts to bring level back to normal, this is after approx 2,800 since serviced The leaks are coming from 3 areas - the linkage seal, the pan gasket, and the rear transmission seal. The emergency brake shoes are impregnated with fluid and will need to be replaced. The transmission showed evidence of overflow from the top vent.
They want to keep the rig for 2 days and a major service
THe leak disappeared for a week but now has a very slow drip. I need to head east this week over the mountains and not certain of a course of action.
Thanks.
Jack H
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Old 03-09-2014, 03:53 PM   #12
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If you are heading back to Holland MI, I know what MY course of action would be!

I would suggest that you keep all records, receipts, documents, text messages, phone messages etc.

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