According to Echo which is a Japanese company the John Deere 55v is a CS500VL I have one of each an echo and a John Deere and they are identical except for color
SRM2301
Echo (cs-650evl) branded for John Deere (ty65sva)
Swis
The displacment is 71cc The model is the same as an echo CS-702 VLhttp://store.chainsawr.com/The Echo CS-601 is 59.8 cc
A John Deere model A holds 9.25 qts of oil.
The John Deere 850 is a compact tractor and the most recent model available is John Deere Z850A. This newer model offers more horsepower and hitching capability compared to the John Deere 850.
It will fit according to John Deere Attachment Fit Guide
The best place to find a John Deere Model A tractor would be on the official John Deere site. Their site would give one information on where a tractor can be purchased.
The John Deere model 60 was made from 1952-1956. Here's a website full of information about the model 60...see related link...
The most successful tractor model built by John Deere was the Dain All-Wheel-Drive. The most successful two-cylinder tractor produced by John Deere was the model A. The 730 was also very popular, as was the 4020.
No John Deere break down all of the time where i work they have John Deere and it seems like they spend more time in the mechanic then being used for work