Circuitry wise I don't think the lube is cut off in R but the planetary is being subjected to very high rpms with the drum being held by C4. Couple that up with PTO work such as a blower is done at rated rpm and you really have a possibility of excessive heat buildup. Lube pressure is 75 lbs regardless of the selector position. From a design standpoint it may have been better to have an oil spray right onto the planetary set but I have seen very few planetaries damaged by this operation. It happened rarely but is always good fodder for critics of the RPS.
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