Rerouting tranny hose and filter

[David Anderson]

Wow, I knew it would be a bear to get these hoses off.  8 hours and I've removed 2 of 3 hoses.  In doing this its seems Eagle could have done better in the routing of the hoses.  Here is the way it is plumbed.

On the curb side of the tranny, a hose comes out of the case and makes a wide loop over the top of the transmission case to the top fitting on the heat exchanger located street side.   
The second hose comes out of the bottom of the heat exchanger and makes a long loop over the top of the tranny and connects to the oil filter on the curb side.
From the opposite end of the oil filter housing a hose leaves there and makes a long loop over the tranny top to the street side of the tranny case.  I'm not sure why they plumbed it this way with all these big hoses running across the tranny top to get in the way of everything.   Each hose is about 6' long.

My thought was to move the oil filter to the street side which would eliminate two loops over the top of the tranny case.  There looks like I have enough room to do this.  I assume the static level of the filter needs to be higher than the sump to avoid drain out when changing the filter. 

Any gotchas in moving the oil filter to a new location?  The filter housing bracket can bolt to just about anything.

David

[luvrbus]

David, move it to inside the battery compartment on the road  side and fwiw the filter or the transmission doesn't care if it is on suction or return side if that helps in routing the hoses, Eagle did do better routing on the 740 they go under the transmission lol 

good luck

[David Anderson]

David, move it to inside the battery compartment on the road  side and fwiw the filter or the transmission doesn't care if it is on suction or return side if that helps in routing the hoses, Eagle did do better routing on the 740 they go under the transmission lol 

good luck

Thanks Clifford. 

I haven't studied it closely, but is looks like the fluid travel is:   heated oil out of the tranny, then to heat exchanger, then to filter, and back to tranny. I'm assuming this is the logical plumbing configuration, correct?

David

[bevans6]

If I had to make a choice, I would put the filter before the cooler.  Why clog up the cooler with stuff the filter could catch?

Brian

[lostagain]

The longer the hoses, the more cooling? Or is it not significant?

JC

[JackConrad]

On our 740 there are 4 hose connections on the transmission. Per Allison 740 manual, 2 are for the cooler and 2 for the filter (separate circuits). We moved the filter to the passenger side engine compartment for easier accessibility. We also added an auxiliary cooler. The cooler circuit goes from the transmission to the auxiliary cooler, then to the OEM engine mounted cooler, then returns to the transmission.  Jack

[luvrbus]

Guys,remember David doesn't have a Allison and fwiw Allison requires 2 filters on the 740 now on all new rebuilds or the warranty is void I have always used 2 long before Allison came out with their service bulletins 

[David Anderson]

Wow wee, this has been a job.  I had to remove the radiator to get the last fitting off.  After a thorough examination, there is really no room to move the filter cartridge to the street side, so I'm going to plumb it back the same way.  I figured it lasted 25 years that way, so I probably won't do this again, I hope.

Now is the time to thoroughly inspect everything behind the radiator.  First thing, I'm replacing is the street side exhaust manifold.  Mine is very thin.  As soon as Luke finds one it will be on its way. 

The fluid flow from the Voith manual is hot oil from the tranny to the heat exchanger, then through the filter, then back to the tranny.  The arrows on the filter housing corroborate this.  Lots of oil moves through those 1 1/4" lines and the heat exchanger is 2x as big as the DD oil cooler.  It is needed when I ride that retarder down those Rocky Mountain passes.   

My whole body aches from turning wrenches for 3 days.

David

[thomasinnv]

hey guys, not meaning to thread highjack but...i have an alison 740 how would i know if i have a retarder?  would i see a switch somewhere?  there is a light on the dummy light panel that says 'retarder' but i don't see a switch anywhere.  is it a safe assumption that i do not have a retarder setup?

[luvrbus]

The 740 had no retarder 

good luck

[thomasinnv]

The 740 had no retarder 

good luck

thanks.  learning something every day.

[Dreamscape]

David, Good to hear your fix is almost put to rest! Also happy you did not incurr any major problems from your experience.

Take care and stay cool!

Paul

[JackConrad]

Guys,remember David doesn't have a Allison and fwiw Allison requires 2 filters on the 740 now on all new rebuilds or the warranty is void I have always used 2 long before Allison came out with their service bulletins 

Clifford,
  Do they put both filters in the filter circuit or do they put 1 in the cooler circuit and 1 in the filter circuit?  I might add a second filter.  Jack

[luvrbus]

Jack they use a extra in the return www.utxchange.com has the drawing on their site.


good luck

[David Anderson]

I got the hoses made today by Taylor Made Hose Co in San Antonio.  I went to my local NAPA dealer to get it done.  He called me back before starting and asked, "you know how much this will cost?"  It was $390 just for the fittings   He said the my existing fittings are field reusable, but he doesn't have the equipment to make that type of hose.  He suggested I go to Talyor in San Antonio.  

It took the guy an hour to get the fittings off and make new hoses.  It still costs $216 just for the hose with my old fittings.  It took me 3 hours to get them all back on and everything tie wrapped and lots of cussing how difficult it was to turn the 2" wrench on the fittings.  Oh how Eagle could have thought this installation through a bit better than it is.  

After I get the exhaust parts and the radiator back in I sure hope nothing leaks.  If so, I get to cry and do this again.

David