Matt you are hooking to an implement designed for the newer hydraulic systems that the older standard was 2250 PSI ans they now run as high as 3000 PSI.
If you look at the lift cylinder on the rake it is small diameter. That is so it will work fast on a new tractor. You tractor with it's 1000 PSI does not have enough pressure to make it lift. It was made for a higher pressure tractor.
That is why you see 3 and 4 inch diameter cylinders on smaller equipment that was used on the older tractors.
The IH "M" is a low pressure tractor. (Letter series JDs are too) IH changed the pressure some in the 400/450 and then went to the 2000/2250 PSI standard by the early to mid 1960s.
So you either need a larger cylinder on the implement or a after market pump/kit that gives you higher pressures. The larger lift cylinder is the simplest but it will still not work very fast as the hydraulics on the IH "M" are lower pressure and lower flow too.
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