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Old 09-13-2017, 03:40 AM   #10
ComputerChips
Senior Member
 
Brand: Thor Motor Coach
Model: ACE 27.1
State: Virginia
Posts: 315
THOR #7607
Try this:
Remove the nut, then flip the wiper back until it locks into to the outward position. That should remove the tension the arm is placing on the shaft.
You should be able to jostle the arm now and get it to slip off the shaft.
The shaft has two flat sides at its base. There is a tapered knuruled driver that slides onto the shaft (shown above). If that part is stuck in the wiper arm when you get it off you can tap it out with a screwdriver or other tool from the top to make it fall out of the wiper arm. If you over tighten the nut, you might crack the knurled part. So check it before you put it back on the shaft. The wiper arm has the same little knurled pattern so you can increment the position you desire the arm to be in as you re-assemble. I usually keep the wiper flipped back while I reposition the arm, then lay the arm back down to judge its position, repeat until you are happy wth the position and the install the washer and nut...carefully tightened. Somewhere on this site is a post with the torque setting for the nut.
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