We recently replaced the internal screen and gasket on the Allison HT 740 and in the process
found someone had installed a sheetmetal screw with a rubber gasket to plug a hole in the sidewall of the pan.
We welded it closed and have now found out that there are some other thin areas and I would like to just replace it.
Where would be a good lead on purchasing one?
Phil
We bought ours new from a transmission place called WW Williams. http://www.wwwilliams.com/ The cost of the pan & gasket was around $450. This was new. They installed it along with some new cooler hoses, fluid, and gave our bus a little check over, for $500. We didn't have any other options, we blew a cooler line on the road. Previous owner had backed over something and crushed the bottom of the pan in, so we just replaced the pan when we had the hose fixed.
Any Allision dealer will have 1 just get the same depth you have now because there are 3 different depths on the pans
I did find one for 373.36 for the 6 incher low profile pan.
I just replaced all the fluid and changed the screen and now I have to do it all over.
At least I can install the modulator for the air throttle at the same time the fluid is out.
When we changed the fluid the manual stated to add 26 quarts and then 1 at a time until showing up on dipstick.
Does this assume that it is a normal pan drain because it took quite a bit more to show up on the dip stick.
Also I think my Neutral position switch is bad, but I have not noticed that it is keeping anything from working so should I worry about getting this fixed also.
I've heard that the high idle would be one thing that depends on this, but my high idle is not working so I will not worry about it.
( maybe this is why the high idle is not working!)
My 740 takes 8 gals with the 6 inch pan fwiw
Quote from: Chariotdriver on August 12, 2008, 07:07:23 AM
I've heard that the high idle would be one thing that depends on this, but my high idle is not working so I will not worry about it.
( maybe this is why the high idle is not working!)
Yes, the high idle should have a couple interlock circuits that only allow the fast idle to engage when in neutral with the parking brake applied. I do not know how much a neutral start switch is, but while you have all the fluid drained??? Jack
the last switch I bought was 18 bucks from NAPA
Care needs to be taken when filling an auto transmission after a simple pan removal.
There is an undetermined amount of fluid up in the transmission, the torque converter being the big unknown. You can't really determine a rate at which it may or may not drain to pan level.
Allison has suggested the smallest amount that you can safely blind pour into the pan, then you have to go gently, checking that you don't over do it.
For those who use the forum as their only maintenance book, remember this is with the engine running.
If you have to know how much, for a rough idea, you could measure what came out...
happy coaching!
buswarrior
Also on that pan you might score a used 1 reasonable from just about any Allison dealer or maybe try
Sam Caylor @
Caylor Supply, LLC
http://caylorsupply.com/index.html
4712 Rock Creek Rd
Rantoul, KS 66079
785-878-3405 phone (almost always has what I need, reasonable $, ships fast & reasonable!)
Don Bowen @
Choo Choo Express Tours & Garage
135 Prater Rd.
Rossville, GA 39741
706-891-1242 (has been parting out a bunch of buses lately and may have one laying around reasonable)
Nimco/ bus divsion
www.nimcobus.com
PO Box 5157
Newark, NJ 07105
973-589-9265 or 800-526-8055 (huge inventory of all kinds)
Luke or Mike @
US Coach
Berlin, NJ
888-262-2434 (recently moved hopefully Nick, Jack or someone can provide updated info)
FWIW these are some of the sources I use! ;D BK ;D
Just stole this from another thread!
New Addres and #'s for US Coach
U.S. Coach & Equipment Sales Inc.
3366 N. Mill Rd.
Vineland, N.J.
856-794-3104 office
856-794-3108 fax
uscoach@att.net
Thanks for all the sources of info, will call Wed.
Phil