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When you move the gear shift lever through the cross over slot from the lo to hi sides of the quadrant, do you feel any detents? If you don't feel detents (they're only at the extreme right & left ends of the crossover slot) you either have a broken or seriously rusted detent spring, ball or plunger on the hi lo shifter or the shifter shaft is loose. When you move the gear shift through this cross over slot, you're doing the same thing you did on the older B's when you moved the "other, HI LO gearshift". If the detent is not working, the tractor can slide into the neutral between the lo & hi positions. If the shaft is loose, the shaft, shifter and sliding gear can all very easily move out of the HI range position in particular. Park it. Shift it into 4th gear (makes reasssembly easier) then remove the steering wheel, steering shaft, steering pedestal, shifter quadrant and top cover of the transmission as a unit & take an inspection tour. Since your trouble appears related to HI & LO, pay particular attention to the "odd" shifter. It is taller and towards the front of the tractor from the other three shifters. Don't keep using it as is or you'll soon (if not already) have GEAR trouble too! Let us know what you find. Later.
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