Re: 660 ground speed

Posted by Wardner on November 28, 2006 at 15:04:17 from (206.148.20.196):

In Reply to: Re: 660 ground speed posted by randy hall on November 28, 2006 at 14:27:00:

Randy,
From the parts book:

Farmall 560 15/49 teeth (slower)
IH 560 16/49 teeth (faster)
IH 660 15/49 teeth (slower)

The main shafts (pinion gear at end) all have different part numbers.

This appears opposite of your intuition. The 660 is geared slower at the ring and pinion than the IH 560. To get both tractors runing a top speed of approximately 16 mph, the 660 is made to run at 2400 rpm vs 1800 rpm(?) for the IH 560.

If you have the time, you can do the math that I outlined previously. Suffice it to say that the reduction of the planetaries is more than offset by the higher engine rpm.

Other differential gear sets will fit the 660. They come from the SMTA, 400/450, and corresponding W models. They will all dramatically increase the speed of any 560 or 660. Top speed might be in the 19 to 22 mph range. I am not going to look up teeth counts on them and do the math unless you beg me.

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