They don't "slip" anything when the accumulators are low.
When there is insufficient oil left to make up or down shifts the flow sensor spool drops down and disengages the Master Clutch until pressure is built in all three transmission clutch circuits then M/C pressure will be available again. This can happen during multiple quick shifts, up or down, even if the accumulators are fully charged.
This feature is the main reason the Magnum transmissions survive as well as they do.
Charging the accumulators is a routine maintenance item, low charge is not indicative of an internal transmission problem in any way.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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