With the limited information you supplied, there were 3 runs of the 1641 depending on serial number range.
The 1641 had a Hydro Gear transmission different from the Sundstrand that was normally used.
I looked through my Library and could not find anything as far as a Service Manual for the Tractor Chassis, nor anything on Hydro Gear.
The best I can come up with is a Owner's Manual.
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[B]Roland Bedell[/B]
CC Models: 100, 105, 1450, 782, (2) 784, & 2072
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