PT20J Posted September 4, 2018 Report Posted September 4, 2018 I've noticed a bit of wobble in the trim wheel on my M20J. It wobbles maybe a quarter inch left to right when the wheel is grasped at the top or front. Anyone know how much wobble in the bushing is normal?
milotron Posted September 4, 2018 Report Posted September 4, 2018 Trim wheel on my K is wobbly also and would like to know how this turns out... easy 1/3 to 1/2" movement at the end of the wheel. This is definitely not chain slop; it is in the bushing/bearing/axle tolerances. There was mention of a roll pin in @yetti s link. Maybe that helps iain
PT20J Posted September 7, 2018 Author Report Posted September 7, 2018 I removed the trim wheel and gearbox assembly from the airplane to examine it. The steel trim wheel shaft runs through a hardened brass bushing. In my case, both parts were worn causing the wobble. The service manual doesn't mention lubricating this part -- probably because there really isn't a good way to lubricate the bushing without removing the chain, driving the roll pin out of the sprocket and removing the trim wheel/shaft and applying grease. A better design would have been to use a standard size oilite (oil impregnated sintered bronze) bushing. I ordered a new shaft and bushing and plan to drill a small hole in the top of the bushing. That way, at annual I can remove the plastic chain cover and pump some grease in with a grease needle. Skip 1
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