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(ET) E20 transmission whine and overhaul advice request
The transmission whine while mowing the grass has been getting louder over the last 2
years. Yesterday the whine was so loud that I started thinking of getting ear plugs, or
taking the transmission apart and replacing the (imagined) offending bearing.
I took the transmission apart, 90W oil was clean and proper level, no metal flakes at
all in case. I used heat and a brake drum puller to remove wheel hubs (remove 2 set
screws on each hub), a bearing puller to remove axle shaft housing & outboard bearing.
The gears and bearings all look good (after 30 years of use?!), only minor shifting gear
wear. I think the offending whine maker is an idler shaft that has a splined gear and
a integral gear, and maybe a missing thrust washer. The splines (fine splines) are
loose and the gear warbles where it should be tight (the splines are not for shifting,
maybe for assembly or maybe the gear could be welded (maybe clearance problems with
welding) on the shaft. The side face of the splined gear had a thrust washer against
the (pulley side) bearing boss & needle bearing, the other end of the shaft did not have
a thrust washer at the (brake side)case needle bearing.
Does anyone have a exploded view of the transmission guts, showing thrust washers etc.?
Has anyone encountered a whine caused by a loose splined idler gear? Am I on the
right track?
jim leuba
leuba at cncrepair.com