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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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  #1  
Old 2 Weeks Ago
badandy badandy is offline
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Default Transmission gurgling

The engine is off (hasn't run in 30 days), I'm playing with the throttle/cruise cable, and with the accelerator pedal to the floor and trans in gear it's making a gurgling sound. I suspect the modulator has sprung a leak and is pushing air into the trans? Or is this normal? If I let up on the throttle it no longer gurgles.
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Old 2 Weeks Ago
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[QUOTE=badandy;447725]The engine is off (hasn't run in 30 days), I'm playing with the throttle/cruise cable, and with the accelerator pedal to the floor and trans in gear it's making a gurgling sound. I suspect the modulator has sprung a leak and is pushing air into the trans? Or is this normal? If I let up on the throttle it no longer gurgles.[/QUOTE

Mike H is the man but I would guess modulator/kick down.
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Old 2 Weeks Ago
badandy badandy is offline
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I don't think there's anything else with air on the old-fashioned Allison... The gurgling though, I thought I was hearing things.
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Old 2 Weeks Ago
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Sounds like you need a new one of these-

https://www.cw-industrialgroup.com/P...sion-Modulator
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Old 2 Weeks Ago
badandy badandy is offline
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Ordered it last night... Weird thing though, you'd never know it was doing this. It seems to have been working fine.
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Old 2 Weeks Ago
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Randy Dupree Randy Dupree is offline
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It must not have been leaking much air,you would think the extra air would want to escaped out of the tranny vent,bringing some fluid mist with it.
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  #7  
Old 2 Weeks Ago
badandy badandy is offline
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It might have just started doing this over the winter while it sat. It hasn't moved since late November. I let it gurgle for 30 minutes and nothing came out of the vent, but I bet it would if it were running. It's a real gurgle, it is loud enough that it sounds like the water fill vent!
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From what I remember, this was a part that needed to be changed at 50K or 100K mile intervals... not a very long service life! It is always working back and forth in a somewhat hot environment. My best guess is that the internal o-rings get brittle/hard in a pretty short amount of time and start to leak air. Old guys that would know are getting fewer

You want this part to be doing it's job at 100%. It is the only thing telling the tranny to bump down into a lower gear when climbing hills. Newer PT coaches (after '88-1/2) have electrical inputs from the DDEC. Even the early, mechanical 8V92's after '86 had a physical cable that would sense throttle position and give the 700 series Allison control module an electrical input as opposed to air.
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Old 4 Days Ago
badandy badandy is offline
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The new modulator has arrived. The install sheet with it says to change it every 12 months/50k miles or at every oil change!
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Old 3 Days Ago
oldmansax oldmansax is offline
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Quote:
Originally Posted by badandy View Post
The new modulator has arrived. The install sheet with it says to change it every 12 months/50k miles or at every oil change!

I hope that's a joke, misprint, or you didn't get the right Chinese translation!!


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