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

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  #11  
Old 12-13-2012
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Rob Robinson Rob Robinson is offline
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John I talked with Jim this afternoon and half the conversation consisted of your expertise. Speaks for itself. Yet another example of a Wanderlodge Owners Group member coming to the aide of another.
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  #12  
Old 12-14-2012
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Mallie Lennon Mallie Lennon is offline
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I enjoyed reading this thread. Good example of what the WOG bunch is all about. And John Wyatt is one of a kind.
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  #13  
Old 12-14-2012
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Quote:
Originally Posted by Mallie Lennon View Post
I enjoyed reading this thread. Good example of what the WOG bunch is all about. And John Wyatt is one of a kind.



Wyatt kind is he ?
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  #14  
Old 12-14-2012
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Quote:
Originally Posted by yesmar View Post
Jim Nichols came to TGO looking for John Wyatt to trouble shoot why his neutral light on his transmission stayed on even though it was in drive. It seems he had talked to a couple of transmission specialist who did not seem to know. John fixed it!

Jim wanted john to dive right in and start plugging and unplugging, but john would have none of that. Instead of try this, try that, etc., John took the prints, manual,etc. and studied them rather than blindly going forward without a clue. Sure enough, john went directly to the problem and fixed it. What is amazing, John did not tear anything else up in the process. That maybe is why they would only work on it while I was away.

Hish hosted a social for Jim at his lovely home with all the Blue Birders in the park. A great time was had by all. I gave Jim the ten cent tour in my golf cart with out enclosures in the rain. Jim must be pretty smart, because he wore a rain suit while I got wet. It was nice of Sue Ameral to dry my clothes at the social.

Now that my report is filed, see you later.
Now the rest of the Story as I see it.
John Wyatt did a great job on the Jim Nichol's year long confused tranny issue.
John W. had some drawings & better Yet, he knows how to read them.

Richard was kind enough to invite about 20 people to his place.
Since it rained & Richard got wet, Richard then invited everyone to Hish and Sue's place. Lots of good food and we all had a great time at Richard's party held at Hish's house. Thanks Hish & Sue.
As usual Jim baked a batch of his famous cookies. Bill (me) was responsible for delivering the cookies since Jim had to leave for Clearwater.

So, if you received the cookies they were great, if you attended this gathering and did not get cookies,
I (Bill) ate them. Yum Yum.
Attached is a picture of a Golf Cart Float in a Famous Florida Christmas Parade.
Does anyone know this "GOOD SPORT"

Happy Holidays to All
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  #15  
Old 12-14-2012
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Quote:
Originally Posted by Joatha View Post
So, where was the issue (with the electrical portion of the transmission that is...I don't want to know the issue around wearing each other's clothes. LOL)?
Early this past summer, Jim Nichols called to ask if I had any idea what could cause the “Do Not Shift” warning light and the “Neutral” indicator LED on the transmission touch pad to intermittently turn on and off while the coach sat parked at night.

We talked about a few things to try such as checking the bulkhead connector on the transmission and the connectors on the transmission ECU for signs of water or corrosion, checking the ignition switch circuit, checking a few relays in the lower front component panel, etc, etc, but none of that solved the problem.

Later in the year Jim told me that his “Do Not Shift” light had stopped working (even at start up) and that the “Neutral” LED was staying “on” all the time when the ignition switch was in the “off” position.

By the time we got together at TGO Jim had installed a spare Transmission ECU and he had proved that the ignition switch wasn’t the problem.

A couple of noteworthy things that we found when Jim got here was that with the ignition switch “off” you could press the button for any gear on the touch pad and it would light the LED for that gear.

We also found that the “Check Tran” light was no longer coming on when the ignition switch was first turned “on”. The other lights and buzzers that normally come on when the ignition switch is turned “on” were acting normal.

Looking over the prints I saw that the ECU relay (K20 in the lower component panel) could be picked up by a pressure switch called the “ECU oil pressure switch”.

At first I thought they were referring to the internal transmission “lube” pressure switch located in the transmission valve body but after looking at the prints again, I found that the voltage from the “ECU oil pressure switch” didn’t come through the transmission bulk head fitting, it came through the engine AMP connector “B”. At that point I realized that the pressure switch in question was actually an “engine” oil pressure switch, not a “transmission” oil pressure switch.

From there my guess was that the oil pressure switch we were looking for might be on the same manifold that the engine oil pressure sender is on. A voltage measurement confirmed that the “normally open” 3 psi pressure switch was conducting enough power to pick up the transmission ECU relay even when there was no engine oil pressure.

Removing one of the pressure switch wires verified that we had found the problem – the transmission touch pad started working like it’s supposed to with no “neutral” light unless the ignition switch was “on” and the “do not shift” light came on when the ignition switch was first turned “on” like it’s supposed to.

Jim is going to have the switch and the oil pressure sender replaced when he gets to Tampa – we didn’t want to risk getting oil on TGO’s concrete pad.

I’m confident that we found the problem but it won’t really be “fixed” until Jim gets the pressure switch replaced.

The bad pressure switch is item 33 in this print from the WOG files:
http://www.wanderlodgeownersgroup.com/downloads/1991-1994%20diagrams/92-4DdecII%20MastrA.pdf

It took a lot longer to type this than it took to find the trouble but hopefully it will help someone.
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  #16  
Old 12-14-2012
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Randy Dupree Randy Dupree is offline
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Very interesting.
I wonder if that oil pressure switch is on all 8V92s with the 754? trans?
Not just on Birds,but on home built bus conversions with mismatched engine and trans combos?
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  #17  
Old 12-15-2012
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Quote:
Originally Posted by Randy Dupree View Post
Very interesting.
I wonder if that oil pressure switch is on all 8V92s with the 754? trans?
Not just on Birds,but on home built bus conversions with mismatched engine and trans combos?
Hi Randy,

I looked at the prints for my 91 and it shows it using the same pressure switch but at this point the only one I can confirm is Jim's 93.

My 91 has an Allison HT-755CR transmission.
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1991 40' WLWB-WTB
Body Number F095567
My Location: http://www.bbirdmaps.com/user1.cfm?user=4

1991 40' WB ...From 2008 - Present
1984 ½ PT-36 .From 2000 - 2008
1973 FC-31 .....From 1991 - 2001
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  #18  
Old 12-15-2012
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giderich giderich is offline
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John, you and I talked at RATS about my 88WB having an issue with the neutral light coming on after the coach had set for a few hours, even though the ignition switch was in the OFF position. When this neutral light is ON, I can push any button on the Allison keypad and the neutral light will go off and the pressed button will light up. My transmission is a Allison HT741. I'm guessing, as a test, if a jumper is placed across that Kysor 3 psi 1042-24900-03 pressure switch, the neutral button on the touch pad will light up...

Thanks for your insightful troubleshooting efforts...we owe you big time!!!

Tomorrow I will have a look at the 3 psi Kysor switch......
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  #19  
Old 12-15-2012
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[QUOTE=giderich;
Thanks for your insightful troubleshooting efforts...we owe you big time!!!

Maybe we all (especially me) better start [B]paying up big time[/B] - for fear John may curtail his advise program and close the Wanderlodge sick bay clinic

I for one would cry
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  #20  
Old 12-15-2012
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This oil pressure switch has me thinking about the problems we have at times with the "do not shift" light.

I knew that the trans computer talked to the engine computer,but had no idea other than:
Engine speed
Road Speed
and who knows what else..

I never suspected the engine oil pressure was a factor.
Interesting topic.
Its sure nice to have someone on WOG that knows what all the squiggly things on the prints mean!
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