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Topic: VDO Speedometer Sender for 643 Allison (Read 514 times) previous topic - next topic

VDO Speedometer Sender for 643 Allison

My sender has gone Tango Uniform and the VDO speedometer (installed by a PO) now reads about 50% of actual speed. Does anyone know the part number for the sender? Do I need to provide more information? Nothing on a Google search leaped out at me.

Craig
1993 U225 36' Unihome GV with PACBRAKE exhaust retarder, Banks Stinger and Solar Panels.
Toad: 1999 Jeep Wrangler 2-door soft-top.

"No one has ever had to evacuate a city because the solar panels broke."

Re: VDO Speedometer Sender for 643 Allison

Reply #1 –
Before I would condemn the sender I would check the drive assembly pins and also for grease as they often do not get greased not sure which cruise control you have but some also have their sender on the same adapter
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: VDO Speedometer Sender for 643 Allison

Reply #2 –
It is gear driven. One on the sender and a pencil gear that drives both the speedo and cruise. I would look there first. Replaced the pencil gear on my '87.
1994 U280, Build 4490
Deming, NM.

Re: VDO Speedometer Sender for 643 Allison

Reply #3 –
Quote from: red tractor –
Before I would condemn the sender I would check the drive assembly pins and also for grease as they often do not get greased not sure which cruise control you have but some also have their sender on the same adapter
Can take the assembly apart without all the transmission fluid coming out? I actually do suspect the drive assembly. I have managed to take a photo of a plate that appears to give its s/n and hoping that I can get the appropriate part from Allison.

Craig
1993 U225 36' Unihome GV with PACBRAKE exhaust retarder, Banks Stinger and Solar Panels.
Toad: 1999 Jeep Wrangler 2-door soft-top.

"No one has ever had to evacuate a city because the solar panels broke."

Re: VDO Speedometer Sender for 643 Allison

Reply #4 –
You can take the adapter off of the pencil gear and disassemble it first and check the drive pins the pencil gear assembly can be removed without losing fluid
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: VDO Speedometer Sender for 643 Allison

Reply #5 –
I think I have the same problem. Can someone post a photo of the drive assembly or point me to a mechanical drawing?
1993 U225 Build #: 4285
500 Watts Solar
Honda CRV AWD
Former 1981 Foretravel Travco
Retired, Full Time Off Grid Snowbird

Re: VDO Speedometer Sender for 643 Allison

Reply #6 –
You will find it on the passenger of the transmission towards the driveshaft end toward the upper part of the transmission
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: VDO Speedometer Sender for 643 Allison

Reply #7 –
On our U225 I think the speed sender is on the driver side at the forward end of the transmission. There is a metal placard next to the connector that gives the data to be able to order the new parts. The sender is fully mechanical and gear driven (according to my mechanic). I sent him a photo of the placard and he thinks he can order a new part. The cable that connects to the transmission is pretty thick.

Photo is of my placard.

Craig
1993 U225 36' Unihome GV with PACBRAKE exhaust retarder, Banks Stinger and Solar Panels.
Toad: 1999 Jeep Wrangler 2-door soft-top.

"No one has ever had to evacuate a city because the solar panels broke."
 

Re: VDO Speedometer Sender for 643 Allison

Reply #8 –
Google, Woodward Mini Gen and see if this is what you need.
The selected media item is not currently available.Bill&Doris 97 U270 36'
University of Parris Island Class of 66
Semper Fi  Build# 5174 MC#17094