Light switch needs to be replaced. The vinyl cab curtains show all of their 30 years and need to be replaced or just remove the cab entirely.
I also just noticed that apparently some mice were chewing on the engine harness, needs some tape or something; that's pretty recent as it wasn't like that this past winter (see pic). As far as running condition, engine runs great and is indicative of it's low hours (480 hours).
If you want to start using it right away you can, although I would probably change that hose that's spurting some diesel before too long. As noted, the loader works great, the 4WD works great, it runs and drives fine for a 30 year old tractor.
The only thing not currently working is the backhoe which needs that cylinder tended to. Includes the 3-point hitch hardware, a couple new hydraulic cylinders, a new seat, oil (gear, hydraulic, and engine), and a few filters (engine oil and fuel filter) - (see photos). The original backhoe seat is included as well, although not shown in the photos. Please study the photos carefully as they form a part of the description.
Tractor is listed locally and I reserve the right end the listing early. The item "JOHN DEERE 855 COMPACT UTILITY TRACTOR 4WD with 52 Loader and 7 Backhoe, DIESEL" is in sale since Sunday, June 6, 2021. This item is in the category "Business & Industrial\Heavy Equipment, Parts & Attachments\Heavy Equipment\Tractors".
The seller is "vintagelectron" and is located in Andover, New Hampshire. This item can't be shipped, the buyer must pick up the item.