Eaton 1100 ground speed

[bds1984 1,444]

Over the years I have owned a few Wheel Horses with an Eaton 1100; C195, C175, and a 520H (which I still own).  The 520 is primarily a plow tractor which serves me just fine except that it is slow compared to the other two.  I understand the difference in ground speed with the C195 is probably due to the larger rear tires on it, not a big deal.  Before you ask, yes, I have checked the adjustments of the linkage and what not, I have checked the belt, the fluid and filter were changed within the last year, tires are the same size (23" tall), and it'll push/pull pretty much anything asked of it so I know the pump is not weak.  So, let me pick your brains.... why is my 520 noticeably slower than my C175 and C195?  Any ideas?  

[lynnmor 7,354]

The 520HC had gearing for a higher ground speed than the 520H, perhaps someone knows if that is the case with the other tractors you mentioned.