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Old Oct 12, 2012, 07:14 AM
billisfree is offline
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Grease for Nylon gears


My Super Cub Cessna has ruined two sets of gearboxes now, overheated the bearings and prop shaft flew off. Somebody sold me this plane without the instruction manual.

What is best lubercant to use on nylon to plastic surfaces?

Vaseline? Light machine oil? Lithium grease?
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Old Oct 12, 2012, 10:10 AM
dedStik is offline
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Be aware that petroleum based lubes may actually damage the nylon, try this http://secure.hobbyzone.com/search/t...FQqZ4AodfFMAkg
Old Oct 12, 2012, 10:28 AM
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You should NOT have to lubricate nylon gears. I would check the clearance between gears, and ensure that they are not too tightly meshed.

Les
Old Oct 12, 2012, 11:05 AM
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Quote:
Originally Posted by LesUyeda View Post
You should NOT have to lubricate nylon gears. I would check the clearance between gears, and ensure that they are not too tightly meshed.

Les
AHAA, Don't servos have grease on their nylon gears?
Old Oct 12, 2012, 11:33 AM
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I use white lithium grease on my servo gears. Never had to lube a gearbox. I would go with Les on that one. Make sure your gears are meshing correctly, not too tight or loose, and everything is lined up straight and no bent shafts. If your prop is way out of balance, that could stress the system too.
Old Oct 12, 2012, 01:10 PM
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Quote:
Originally Posted by billisfree View Post
overheated bearings

Light machine oil
Lube the bearings, not the gears.
Old Oct 12, 2012, 01:16 PM
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Lube


Quote:
Originally Posted by Ron H View Post
Lube the bearings, not the gears.
Petroleum based lubricants are not friendly to plastic or nylon parts. Nylon gears don't need lube.
Old Oct 12, 2012, 01:52 PM
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Quote:
Originally Posted by lcm1977 View Post
I use white lithium grease on my servo gears. Never had to lube a gearbox. I would go with Les on that one. Make sure your gears are meshing correctly, not too tight or loose, and everything is lined up straight and no bent shafts. If your prop is way out of balance, that could stress the system too.
I was gonna say Lithium Grease too. It's what I use on my Fishing Reels that have nylon gears, which ain't NONE of my Saltwater stuff...
Old Oct 12, 2012, 02:54 PM
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The grease can attract dirt, which will contribute to rapid wear. All by itself grease will not harm the nylon gears. If they are exposed during ground maneuvers the overall effect will probably be more damage than help.

I've used a spray on DRY Teflon lube I found in a hardware store. Seemed to help a tad.
Old Oct 12, 2012, 05:56 PM
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Nylon is a tough & slick material. If you get the teeth too tight. they can distort for a while & cause some noise
Old Oct 12, 2012, 07:42 PM
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I use dry graphite powder sold as a lock lubricant. Once you get a nice even coat of it in the gears it is there for good and doesn't need to be replaced or replenished. It's dry, so it won't attract dirt and it also won't harm the plastic. It really quiets the gear noise too.
Glenn
Old Oct 12, 2012, 09:18 PM
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Lithium white grease is synthetic so won't hurt the gears.

Gord.
Old Oct 12, 2012, 09:52 PM
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Silicone lubricant also won't hurt plastic.
Old Oct 12, 2012, 10:50 PM
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Thanks all.

My "melted" area is the pressure plate between the gear and the plastic.

It gets hot... nylon gear hub gets soft... plane seems to have weak power for a bit, then shaft pulls free of the gear... prop goes bye-bye. Hub and plastic show signs of meltdown.

OK, I won't try to lub the gears now.


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