On the low clearance MF50 there is an inner axle seal that is supposed to keep the transmission oil from getting to the wheel bearing so you must pull the axle out and pack the bearing with grease. There is an outer seal that is supposed to keep the grease from getting to the brakes. I think greasing the bearing is listed as one of the periodic service items in the owners manual.
I looked in the online parts book for the 50 and did not see a different rear axle assembly listed for the high clearance 50, so I assume servicing the high clearance rear wheel bearings would be the same as the low clearance.
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