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Topic: speedometer (Read 764 times) previous topic - next topic

speedometer

I am replacing the original non-functioning speedometer in my '93 U240.  It has the MD3060 Allison 6 speed.
I bought the new speedometer at North Hollywood Speedometer and they sent me a wiring diagram with
3 wiring options depending on which sending unit is in the trans. Does anyone happen to know if the sending
unit is hall-effect, inductive, or engine control unit?  Thanks, Ron
Ron & Bette Ringhand previous/1979 33 ft appollo/ 1993 gv u240/ 2003 40ft beaver Marquis/1993 gv u300 40 ft

Re: speedometer

Reply #1 –
Sorry, I can not answer your question.  Try calling Allison and ask them.  There is a label on the driver side of the transmission with serial # model, etc.  You may have to clean the dirt and grease off to read it or take a picture.
Jerry Whiteaker former owner 96 U270  36' #4831 Austin,TX-Owner Mods LCD TV w/front cabinet rebuild - LCD TV bedroom - Dual Central AC, either can cool coach w 30 amp - Skylights at roof AC openings - Drop ceiling for ducting of AC - Shower skylight white gelcoat/wood/epoxy frame - Air Springs/Shocks replaced - 2014 CRV - 8K Home Solar - Chevy Volt

Re: speedometer

Reply #2 –
The Speed-o-meter,
is (most likely) the single cheapest replacement item FT sells.
I pulled out my old one and put the new one in without any issues.  pc
S/W Houston 95" U320C SE/40' 
Build #4778  Cummins M11
Repairs & Covered RV Parking (BAO)
PPL is close..

Re: speedometer

Reply #3 –
Quote from: rinron –
I am replacing the original non-functioning speedometer in my '93 U240.  It has the MD3060 Allison 6 speed.
I bought the new speedometer at North Hollywood Speedometer and they sent me a wiring diagram with
3 wiring options depending on which sending unit is in the trans. Does anyone happen to know if the sending
unit is hall-effect, inductive, or engine control unit?  Thanks, Ron
So, I am running to this same issue and was wondering if anyone ever found an answer to Ron's question. Thanks in advance, Brian
1993 U-240
KD0GEG

Re: speedometer

Reply #4 –
Quote from: MRpotter –
So, I am running to this same issue and was wondering if anyone ever found an answer to Ron's question. Thanks in advance, Brian

First you put on your coveralls.
Second you block you rig up so that it can't squash you.
Third you slide (squirm) up to your transmission and write down all of the numbers on the Data plate.
Finally you go here: Allison Transmission Home
1992 Foretravel Grand Villa
U225 SBID Build No. 4134
1986 Rockwood Driftwood
1968 S.I.A.T.A. Spring
1962 Studebaker Lark
1986 Honda VF700C
1983 Honda VF750C
Charlie, the Dog was broken out of jail 24 Oct 2023
N1RPN
AA1OH (H)e who must be obeyed.

Re: speedometer

Reply #5 –
"First you put on your coveralls.
Second you block you rig up so that it can't squash you.
Third you slide (squirm) up to your transmission and write down all of the numbers on the Data plate."

Ja, shure, you betcha! The data plate will be on the OTHER side, no matter which side I start with. The engine, transmission, and all of those other very solid metal things under there don't move up when I push the raise button. Fifty years ago I was skinny enough to fit under there, and had good enough vision to read those numbers and letters.

The speedometer on my coach reads 0 all the time. It does count the miles, though, so I'm thinking that either something is disconnected somewhere or the needle is loose. If the problem can be cured by changing the speedometer in the dash I'll get a replacement from Foretravel and do it myself while I'm at The Ranch. If the problem is back by the transmission I'll let the young, skinny guys take care of it.

Re: speedometer

Reply #6 –
Usually if one part of the speedo works, the input signal is good.
 FWIW ,if the sender has 3 wires,  it could be a hall sender. Ground,  12 v or 5V plus, signal.
  2 Wires could be VR sender.  + , _ 
 

Re: speedometer

Reply #7 –
Quote from: kb0zke –
"First you put on your coveralls.
Second you block you rig up so that it can't squash you.
Third you slide (squirm) up to your transmission and write down all of the numbers on the Data plate."

Ja, shure, you betcha! The data plate will be on the OTHER side, no matter which side I start with.

The speedometer on my coach reads 0 all the time. It does count the miles, though,

Ok.  How about a $20 and a skinny neighbor kid?

If the odometer works then you've everything you need and the electronics in the speedometer head have gone south.  You might get lucky if you open up the speedo and look for broken solder joints.  High magnification and bright lights can be purchased on-line for short money.  Other than that you need to know the sender type.  Then again the VDO dealer might be able to look at your speedo head and sell you what you need given that you still have a signal.
1992 Foretravel Grand Villa
U225 SBID Build No. 4134
1986 Rockwood Driftwood
1968 S.I.A.T.A. Spring
1962 Studebaker Lark
1986 Honda VF700C
1983 Honda VF750C
Charlie, the Dog was broken out of jail 24 Oct 2023
N1RPN
AA1OH (H)e who must be obeyed.