Tractor Size Recomendations

[Hollow]

Was looking at some of the used JD 4720s online. Noticed that they quote 2 HP ratings 58 and 66? Sometimes in the same year. I thought it was PTO vs Engine but PTO is listed as 56 at JD. Did they change something?

Engine, drawbar and pto?

 

[foreman Etexas]

Engine, drawbar and pto?

I looked at tractor data and it seemed like maybe they had an engine upgrade in 09 or something cause hp ratings increased alittle from the 05 specs....

 

[jenkinsph]

In 2009 Deere increased the power of the 4520 and 4720, the 2009 4520 I bought is 60 hp engine and 50 pto. The 4720 was increased to 66hp engine and 56 hp pto. That was a decent increase in power imo.