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JBernier(at)dart.org
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 Posted: Thu Sep 07, 2006 7:17 am Post subject: Prop seal replacement and subsequent vibration |
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Walt
While we are on the topic of prop hubs, how much grease should be in the hub? And what weight is best?
Jim B
Someone has probably suggested this already but just in case!!!!!! Have you
checked the blade angles to see if one blade has moved in the clamp?
There is no way that replacing the pitch change seals could result in the
vibration you describe. The problem is somewhere else. If the blade angles
are OK the next thing I would suggest is a measurement of piston
displacement to check for a bent rod. Good luck
Walt
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Scooter
Joined: 10 Jan 2006
Posts: 155
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| Posted: Thu Sep 07, 2006 8:18 am Post subject: Re: Prop seal replacement and subsequent vibration |
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I've read that Aeroshell 22 is good (see www.Yak-52.net).
This is something I found on the net at some point. It's part of a three page document written by george coy on "overhauling" the prop:
"The blades are removed by removing the cotter key at the nut at the back of the counterweight / clamp assembly. Loosen the nut / bolt and thus the clamp. Grab the blade and unscrew it from the hub in the normal thread direction. (rightly tightly lefty loosey) Repeat for the other blade. You can now see in the hub and see if you can get away with packing a little grease in at this point, or if it will need further disassembly. There are three areas that need grease. The main collar that moves back and forth, this has an internal fiber bearing that you cannot see. Make sure that there is a good film of grease on the large diameter polished shaft that the collar slides on. This collar also has two ( one on each side ) curved cut outs that the blade retainer pin and shoe bearing ride in. These should also be packed with a little grease. Finally, put some grease just inside the blade bearing collar ( the part the blade screws into ) this will work out and hopefully lubricate the blade roller bearings."
[quote="JBernier(at)dart.org"]Walt
While we are on the topic of prop hubs, how much grease should be in the hub? And what weight is best?
Jim B
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wlannon(at)cablerocket.co
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| Posted: Thu Sep 07, 2006 2:00 pm Post subject: Prop seal replacement and subsequent vibration |
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Jim;
There is only one grease for these props or the equivalent Hamilton Standard
2B20,2D30, 12D40, etc. It is Aeroshell grease 5. Do not use any synthetic
product like Aeroshell Grease 22. As a matter of fact Aeroshell 5 is the
only grease you should use anywhere else on the aircraft.
Do not mix grease brands. If you are changing brands clean out all of the
old grease.
Bear in mind I am an old fart and rather set in my ways but I started in
aviation overhauling propellors 56 years ago. Some years back Shell stopped
making #5 as the MIL Standard was declared obsolete and advised prop.
overhaul facilities to use their new grease #6. That led to numerous
problems and grease 5 was reinstated. It was manufactured for Shell by Royal
Lubricants. Whether that is still the case I don't know. In any event it is
readily available.
As to greasing of the G1 or B530 hub assy. that is basically a shop
function. The critical areas that require grease must be disassembled to
accomplish that. Most critical is the blade bearing assy. including the
micarta (fiber) spacer. There is no way to properly grease these areas
without disassembly.
Cheers
Walt
As to greasing the hub
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