My Volvo 94 850 odometer stop working, I bought

This is a common problem with 850s. The speedometer is driven electrically, while the odometer is mechanical.

There's a tiny little gear inside the odometer that runs it from a motor; it's no longer tied directly to a speedometer cable like older models. What happens is the gear gets old and brittle and loses teeth, at which point it can no longer turn the odometer.

My wife's '96 850 had the same issue when I got it, and a little internet research turned up the answer above. There are companies that make replacement gears you can buy fairly cheaply, but it does require a fair amount of mechanical aptitude to pull the instrument panel and disassemble the speedometer assembly.

One note of caution that I learned the hard way: you have to take the front cover off the instrument panel, exposing all of the gauges. Be very careful not to disturb the position of those little needles; I ended up messing up the gas gauge, speedometer and temperature gauge, and it took a lot of trial and error to get them put back in so they showed the right readings.

If I recall correctly, I found instructions for doing the gear replacement online, but it's been so long that I don't have the web page(s) I found any more. A lot of times the manufacturer of the replacement gears have instructions on their web sites.

IPD USA sells them and has instructions.

850 Odometer Gear

If the odometer stopped but it shows speed it is not the cable. There is a small plastic gear in the speedometer which will strip if you reset the trip odometer while the car is moving. Any speedo shop can repair it

There is a gear in the speedometer that is stripped and is causing the odometer to stop working. You can get a replacement gear from Odometer Gears (Jeff Caplan) 757-593-3478. You will need special tools to replace these gears, so you may want to take the speedo or the car to a speedometer shop.

If you want to solve your problem, click on the link I attached
https://www.reliable-store.com/products/volvo-850-service-repair-manual-1992-1996-download

You have a broken odometer gear wheel which is very delicate and hard to change it cost less than fifty bucks but it will take a volvo expert one hour or more to change if your not volvo acquinted dont attempt to fix it.you will mess the dash board

you need a new odometer there are some worn teeth that when it gets to this spot it stops i am a volvo tech see it often on the 240 and 740 series cars

Possibly a little gear inside the odometer has broken down. You find theese gears easily on E-Bay. http://shop.ebay.com/?_from=R40&_trksid=m38.l1313&_nkw=volvo+850+odometer&_sacat=See-All-Categories

The problem is going to be a worn or broken odometer gear. You can purchase the gear at odometergears.com for $29.00 with the shipping. Follow their how to repair on the Mustang to help in the repair. I believe you will have just the worm gear to replace.
http://www.odometergears.com/subpages/MustangHowTo.html

Suggest you visit this website... http://www.hyperocity.com/volvo240/volvoodometer.htm
Odometer is turned by a mechanical gear wheel, which is the likely culprit.

check the wires plugged to the rear axle center /pull on them/if its the odometer the replace the gear in the speedo head IPD site