I have the 1955 to 1960 Ford manual (reprint). As Sean stated, there is no adjstment procedure for the ORC. There is a procedure for pulling, replacing, etc. but it obviously requires splitting the tractor and some disassembly of the transmission.
R1 and R2 giving you trouble may point to Clutch 1 not applying when the oil is cold. The only other gears affected by this would be 9th and 10th which seldom get used. The following six problems may contribute to a Clutch 1 problem as stated in the manual:
a. Leaking valve body gasket
b. Leaking piston "O" rings
c. Mainshaft seals
d. "C" sun gear seals
e. Leaking servo seals
f. scored or burred piston
a-e would likely get worse as your oil warmed up. A scored or burred piston may contribute when the oil is cold and insufficient pressure is being provided, but the problem could correct itself as the oil warms up and pumps better.
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