Trim worm drive cleaning photos?

[flyingchump]

Gents,

I have some friction in my trim that I've been chasing and I've narrowed it down to the worm drive.  66E.  It certainly looks like it hasn't been cleaned and lubed in a while.

I'm apprehensive about taking it apart without more information.  The parts manual and service shows very little about the internals...  

Anyone have more detailed diagrams or photos?

[RobertGary1]

Are you sure the two jacks screws are getting lubed at annual? Those are common areas for tight spots if not kept lubed. 

[flyingchump]

54 minutes ago, RobertGary1 said:

Are you sure the two jacks screws are getting lubed at annual? Those are common areas for tight spots if not kept lubed. 

Yes, the annual was recently done.  The trim system is fully functional but has a tight spot I'd like to fix before anything gets worse. 

Like I said I've been chasing it down.  All have been recently cleaned and lubed.  I have verified smooth operation for the rest of the "trim system" and nothing seems to be binding.   

[carusoam]

See if you can describe where the friction becomes noticeable...

If you trim from full up to full down...  verify the limits from outside the plane...

If it is Jack screw related... it is usually at the extremes of full up or down...

If it is gearbox related... it may just come and go related to the gears inside the box...

 

There is thread around here related to taking the gear box apart... to clean it...

The old grease likes to turn into rocks over the decades...

It is a job for a knowledgable person, it has some requirements of shimming and sealing...

 

See if you can find the thread...

Best regards,

-a-

[Tim Jodice]

Does it change with temperature?

[PT20J]

Check the chain tension as you rotate the wheel. Mine had a worn bushing where the trim wheel shaft rides, but even after replacing it, there was a slight eccentricity and I found I had to adjust the chain a bit looser to keep it from being too tight and binding at the tightest point of the trim wheel rotation. Keep some light oil on the chain (Mooney calls for grease which makes no sense since the grease won’t get down into the rollers).

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