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Old 12-16-2018, 02:55 PM
Tacco Tacco is offline
Join Date: Jan 2017
Location: White Salmon, WA
Posts: 124

David's right. The reason given is that the Matco bearing grease seals are not supposed to rotate with the wheel. This generates a small amount of rotational drag hence the torque required to turn the wheel. My documentation, for my part number, says 8-10 inch pounds. There is no bearing play, or pre-load, that I can feel and the brake pads are not dragging.
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Old 12-16-2018, 11:24 PM
rcarsey rcarsey is offline
Join Date: Jul 2012
Location: North Brunswick, NJ
Posts: 137

before adding shims and stuff, would it be prudent to eliminate some possible causes:

1. crosswind. taxi up and down the same taxiway.
2. extra weight on left side. taxi plane with pilot seated on right side.
3. p-factor. taxi at a moderate speed, get on the taxiway centerline, then throttle back or turn off the engine.
4. brake caliper or wheel drag. measure torque to turn each wheel.

Failing all of those, then the only thing left is the toe-out... ?
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Old 12-17-2018, 02:45 PM
Mitch757 Mitch757 is offline
Join Date: Aug 2005
Location: Falmouth, MA
Posts: 320

I would also check the perpendicular component of the nose gear leg. If it's tilted it could influence the direction the castering nose gear tends to point.
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Old 12-20-2018, 06:52 PM
Tacco Tacco is offline
Join Date: Jan 2017
Location: White Salmon, WA
Posts: 124

Never thought to check geometry of nose gear.

In any event, taxied from the right seat today and sure enough, pulled slightly right. Itís about the same when I sit on the left side and it pulls left (after adding the shim). I think at this point my particular aircraft is as good as itís going to get. I donít want to overstate the pull. The aircraft is imminently controllable and rolls pretty straight above about 15kts.
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Old 08-12-2019, 11:02 AM
Tacco Tacco is offline
Join Date: Jan 2017
Location: White Salmon, WA
Posts: 124

An update. Provided everything else is straight and you fly solo a lot with partial fuel, increasing the tire pressure in the left tire makes a big difference.
Steve Morrow
RV-12 N12SM
Builder 121036
White Salmon, WA

2019 Donation Paid
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