Author Topic: Why won't B500 with WTEC III shift into gear from shift pad?  (Read 70 times)

Offline belfert

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Why won't B500 with WTEC III shift into gear from shift pad?
« on: October 08, 2025, 03:07:21 PM »
I flew out to look at a 1999 Dina about ten days ago.  However, the transmission on the bus no longer goes into drive.  I took the bus out for a twenty or thirty minute drive where everything was working fine.  I parked the bus back at the car lot, and turned it off.  They wanted me to back up the bus into the spot it had been sitting.  I backed up a ways, but I needed to pull forward because they wanted it over further.  The bus would no longer shift into drive.  I turned it off, and started it again to no avail.  The bus hasn't moved from that spot since I left as it won't shift into drive anymore.  They got someone to replace the front brake chambers as one of the Rotochambers was leaking air bad.

I am pretty sure this B500 has a WTEC III.  Any ideas why a B500 with WTEC III won't shift from the shift pad?  Could there be an interlock with the entry door, or with the entry step?  I am going to look over the wiring diagrams.

I am starting to wonder if this is a sign I shouldn't buy the bus.  I already spent almost $500 on a plane ticket, but I would rather throw away $500 than spend $5,000 on a bus that I can't drive due to transmission issues. 

Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN

Offline belfert

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Re: Why won't B500 with WTEC III shift into gear from shift pad?
« Reply #1 on: October 08, 2025, 05:16:14 PM »
I have been looking at the electrical schematics for my Dina.  My schematics are dated 1997 so not sure if anything changed with the WTEC III.

Anyhow I see the Telma electric brake switch is connected to the WTEC.  I suspect the Telma has been taken out.  I turned on the electric brake while on my test drive, and may have left it on.  Any chance the electric brake switch being on is causing issues?
Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN

Offline belfert

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Re: Why won't B500 with WTEC III shift into gear from shift pad?
« Reply #2 on: October 08, 2025, 05:43:36 PM »
Fixed!  The guy at the car lot was so curious if it was the electric brake switch that he went over to the lot and looked at the bus.  He found the electric brake switch to be in the on position.  He turned the electric brake switch off, and the transmission works fine after that.  He was able to go forward and reverse with no issues.  I am planning to fly out to get the bus on Sunday.  I already delayed my trip from last weekend as the front brake chambers were not replaced yet.  The front brake chambers are replaced now.  (I was able to change my flight with no change fee.)

I am almost certain now that the Telma electric brake has been removed.  I recall seeing the same drive shaft as my bus, and not thinking anything of it at the time.
Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN

Offline CrabbyMilton

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Sometimes it pays not to draw conclusions too soon. We look forward to some pictures at some point.

Offline belfert

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No sane person would ever think that turning on the electric brake would kill the transmission.  It was only after poring over the electrical schematics that I realized that the electric brake switch goes through the transmission.

I was reasonably sure I left the switch on so I figured it couldn’t hurt to try turning the switch off.
Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN

 

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