2009 4720 with 66 HP- How did JD increase HP

[MidGALandscaper]

I purchased my 4720 back in 2006 with 58 hp, 50 at the PTO. Did JD change the engine or is there an engine setting somewhere they changed. Can I take mine back to the dealer and let them turn it up? I want those extra horses too.

 

[Heywood Jannockitov]

They may have added an intercooler. Or it could be partly marketing BS too

 

[slowzuki]

Quite a few companies have changed engine power rating standards causing quite a few blips. The other thing is the engine is likely now a tier 3 with quite a few changes including hp.

 

[Dutch445]

Actually meets Tier IV...
leaner and cleaner...