I have been having the exact same problem in a top load Kenmore 80, starting about a year ago when I replaced the pump because the old one, (30 years old), finally
seized it's bearings.
The new pump design has some rough edges near the water exit port and lint
slowly collects there until it stops it from draining properly. Since the lint clumps do move around a bit, when the problem first starts
occurring it is an intermittent problem, but as more lint accumulates it gets worse and worse.
The old pump couldn't be taken apart, (and never
need to be taken apart), but the new one can be disassembled rather easily and when the lint clumps are removed
everything works great for another month or two.
The pump is the so called direct replacement from Sears, for the washing machine that they sell, but obviously is not well suited for machines like mine that do not have lint filters.
I suspect they want to render my machine obsolete so that I buy a new one, after all they don't make much money selling 1 washer every 30+ years, especially if it rarely needs service. Why else would they sell pumps that don't work in place of pumps that worked well and lasted over 20 years.
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