HT740 slipping

[Paso One]

When I switched to TES 295 when in Florida. I could not believe the difference  how the V730 performed.
I had a real good comparison as I drove down there with Dexron 3 came back with Transynds version of TES 295.
Made me a believer, even though i took a loan out to pay for the TES 295. :0

[luvrbus]

That used to be true, but Allison dropped recommending oil and Dexron fluids with Service Tip #1099 (June 2018). They recommend approved TES 295 fluids (not just Transyd) for all series including HT700. I realize Cliff says HT740's love having oil in them, and it was used for severe service duty for years in vehicles like garbage trucks, but the Allison Engineers have revised their thinking even though the HT740 is considered obsolete.

Now Walter read all of it starting with the beginning serial number that applies to that service tip 251023350088 was the 1st 740 to have the new lining material for the 295 spec,One thing good about systemics it stands more heat and less fluid changes if you have retarder transmission, the B500 was living proof 295 did not extend the life of those     

[lostagain]

My new transmission is a MCI Coach Guard rebuid. Serial no: 30-29833. Is 15W40 OK in it?

[luvrbus]

My new transmission is a MCI Coach Guard rebuid. Serial no: 30-29833. Is 15W40 OK in it?

You would be fine with that 29833 number,you can have the fluid that it was dynoed with tested most on a dyno are tested with a synthetic same color as the Dexron they use one type oil for all  B500 or the MT 640 makes no difference,I had my Allison 4060 serviced at Williams and thought I lost a family member almost a 100 bucks a gal for Transynd  Transmax  Allison spec 353 not the 295 spec because my hyd fan runs off a pto on the Allison 
 

[Jim Blackwood]

So what oil does the B500 use?

[luvrbus]

So what oil does the B500 use?

Transynd is preferred now but back in the mid 90's till around 2002 they used Dexron,C-4 engine oil.or Transynd what ever the operator chose cost wise that worked for him   

[DoubleEagle]

   

Now Walter read all of it starting with the beginning serial number that applies to that service tip 251023350088 was the 1st 740 to have the new lining material for the 295 spec

You might have a different version or a more complete bulletin, the 28 page Service Tip I have is 1099, Rev U, dated June 2018, and I don't see any indication of beginning serial numbers. I sure would not use $100 a gallon Transynd in an old 700 series, but I would consider Mobil Delvac 1 at $33.99 (Summit Racing in Ohio). 

[luvrbus]

You might have a different version or a more complete bulletin, the 28 page Service Tip I have is 1099, Rev U, dated June 2018, and I don't see any indication of beginning serial numbers. I sure would not use $100 a gallon Transynd in an old 700 series, but I would consider Mobil Delvac 1 at $33.99 (Summit Racing in Ohio). 

Walter 1099 came out in 2002 they revise and retract it weekly ,read it close it's a recommendation,since Allison no longer supports the 700,or 600 series and hasn't in over ten years they change specs,me I never heard of the 353 spec except for off highway use.Williams used the 353 spec was supposed to be latest spec for my 4060 with the PTO driven hyd pump.

Walter I fell into the Transynd trap with my FS 740 Allison back in 1999 ,I changed over from Dexron because of the hype on these boards one day I shifted into gear from being parked at a Eagle rally and nothing happen.I called Bob Ware a Allison guru in Ca asking for help the 1st thing he asked did you change over Transynd I said yes he told me that is the problem the clutch lining feel off sure enough when they pulled the pan the linings were in the pan from then on I been leery about changing fluids in the older transmission,lol by the way the Transynd was almost a 100 bucks a gal in 1999 the prices have dropped a lot in the past 20 years   
   

[6805eagleguy]

 My local oil man has a terrible opinion on synthetic so we're rolling with dextron 111 in the b500. I expect to get at least another 50000 miles out of this tranny, which currently has an estimated 450,000. Clifford did say some last till 600,000, so we're taking the chance I guess.

I mean Allison said it was ok for the first 15 years and the tranny sure didn't change...

[DoubleEagle]

So then, it looks like oil or Dexron III are what is safest for older 740's. My last Eagle was purchased from a Allison re-builder, and they serviced it with Dexron III. I asked whether TES 295 was an option, but they said it came with Dexron III, and they were sticking with it. Now there will be a few people wondering what to do with their particular Allison. This important detail of changing the lining material to be compatible with Transynd should be spelled out a bit better even though they no longer support the 700 series. I remember them announcing in 2002 that they were testing Transynd in various series, but I never saw the results. Looks like your trans was an early result. Thanks for straightening this out Cliff.

[lostagain]

So I will fill mine with 15W40. It worked good in my other 740...

[luvrbus]

You have to weigh the cost option is Transynd worth the price no more miles than the average person drives his bus a year ,when William did mine Tranysnd was the new best thing since sliced bread, they done it twice for 800 bucks a pop to make sure all the old fluid was out,I was told it would run cooler and it did about 3 degrees and my FS 740 with the Bennett shifter shifted so smooth I never could never tell the difference with Transynd.My hyd fan holds 20 gals and I thought about switching and asked the manufacture and he said in no uncertain words stick with the Dexron lll that it came with so I will     

[sledhead]

in late 2016  I changed the Allison 4000 fluid and the 2006 filters ?  with this stuff
https://lubricants.petro-canada.com/en-us/brand/duratran-xl-synthetic-blend

and at the time it was rated for the tes 295 

this spring I had to replace some  o rings in 2 of the lines and at that time I changed the fluid and filters again with the same duratran fluid as it is not that much $$$ at about $ 105 for 5 gal. pail so when I buy 3 pails the price is not that bad

any one else using this ?

thanks   dave 

[uncle ned]

On my trip to Blytheville last year I lost the return hose from the transmission cooler to the sump of the v730.

  In replacing the hose and the leaking I lost about a gallon of oil. Not having the manual with me  so looking at the remaining oil i just replaced it with 10w30 rotella.

After I got home ever one on the boars gave me a hart time. they said to use transend.
I finally found in the manual that came with the v730 and it said to use 10 weight mineral oil.
Had worked for 25 years so i figure it is good enough now.

uncle ned

[lostagain]

Finally finished reconnecting everything. Takes a lot of time. Lots of details to take care of. Took it out for a test drive. Works great! I think it shifts smoother than the old one. Only a couple of things don't work: the cruise control (odd because it is an air operated Bendix that is all up front in the spare tire compartment and is not related to taking the engine out). Will have to look into it. And the pyrometer doesn't work. All I did was take the probe out and put it back in... Will look into that too. But otherwise all good. Also thanks to Joe for letting me use his gurney/cart/ cradle (whatever it is called) to pull my engine onto. Well built, solid and plenty big enough and just the right size. I pulled the engine with a chain come-along, and pushed it back in with my skid steer. That part is easy with the right tools. It is the disconnecting and reconnecting all the wiring and coolant and hydraulic lines that takes all the time. And the fixing and improving things as you find them...

Anyway, done. Yea!