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Post by englishnguyen on Mar 22, 2023 9:47:51 GMT
I will replace Main wheel for next time but I can not find the torque value of axle nut ( O-ring) in AMM. Normally, with other airplane, I torque 2 times, the first for tighten bearing, after that unscrew and re-torque with 1/3 first value. I wonder if it is the same with Technam aircraft and what are the two value torque? Help me pls, thank you.  |
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Post by Ed Midgley on Mar 22, 2023 12:11:54 GMT
It depends on which wheels you have. The non Berlinger wheel bearings can be damaged easily. The nut must be set neutral. (No play and no torque on the bearings.
The Berlinger wheels have a positive stop and can be tightened to a reasonable torque.
Ed
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Post by englishnguyen on Mar 22, 2023 22:27:49 GMT
It depends on which wheels you have. The non Berlinger wheel bearings can be damaged easily. The nut must be set neutral. (No play and no torque on the bearings. The Berlinger wheels have a positive stop and can be tightened to a reasonable torque. Ed Thank Ed, I use Cleveland Wheel PN: 40-78B. What is the reasonable torque range for Cleveland wheel? Because on my aircraft configuration, there is not safety bolt on axle, so I need exactly torque value. Thank for your help   |
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Post by Ed Midgley on Mar 22, 2023 23:35:37 GMT
If the bearings are one piece sealed bearings you can’t put any torque on them. If they are two piece Timken Tapered bearings then they will require a very small amount of torque.
The nut you have is similar to a nylon nut and has a built in resistance to turning. The bolt that holds the fairing attachment to the end of the axle is what keeps the wheel on if the nut comes loose.
If they are sealed bearings and Cleavland don’t have a positive stop axle like Berlinger then any torque will cause the bearings to fail in a few hours of flight.
Sorry but, without knowing the exact setup Cleavland is using I can’t give you a definite answer.
Ed
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Post by Ed Midgley on Mar 22, 2023 23:54:26 GMT
I did some more research and you do have Timken Tapered Bearings. With the type of nut you have it would be hard to use a torque wrench as the nut could have more resistance than the the torque. Tighten the nut until you feel it not wanting to turn easily anymore and make sure there’s no play in the wheel.
Timken bearings can function under a wide range of torque so it isn’t as critical as the sealed ball bearings.
If I was there I could show you how to do it in five minutes.
Hope this helps
Ed
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Post by LSA Flyer on Mar 23, 2023 0:25:01 GMT
There is a Tecnam NCA-53 that covers the sealed ball bearings. Ed's advice is perfect for both types of bearing. Tecnam will sell you a socket that will specifically fit that wheel nut. Pricey but worth not mucking it up.
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Post by englishnguyen on Mar 23, 2023 2:04:43 GMT
Thank for your answering. I think this is one kind of Nylon nut. So as Ed said, I will torque until feeling it not wanting to turn easily anymore and make sure there’s no play in the wheel with my socket.   |
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Post by englishnguyen on Mar 27, 2023 4:14:14 GMT
 Today, I replaced new main wheel assembly. Axle nut is Nylon nut as Ed said and I wonder with type of nylon nut, when do I discard this axle nut? Every time we remove main wheel or until friction torque less than minimum recommend value? |
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Post by Ed Midgley on Mar 27, 2023 12:46:10 GMT
It’s a judgment call. If you can turn it with your hand then it’s obviously too loose.
If you have a total bearing failure and lockup then the nut will spin no matter how tight it was.
Ed
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Post by technammech on Mar 28, 2023 14:36:22 GMT
There is a Tecnam NCA-53 that covers the sealed ball bearings. Ed's advice is perfect for both types of bearing. Tecnam will sell you a socket that will specifically fit that wheel nut. Pricey but worth not mucking it up. We had one made for our P92 and I bought one from Tecnam for our P2006T and still had to modify it to adapt a 3/8" ratchet/ breaker bar. We bent a bar trying to take the wheels off with it. |
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Post by technammech on Mar 28, 2023 14:36:53 GMT
The wheel nuts have so much locking torque. Tecnam engineering say they are one time use. Advice for the berringer wheels was spot on yet we had a bearing fail on our P92 from the factory before the first 100hrs. When putting the wheels on the P2006T. I ran it down so it was snug and backed it off 1/2 a turn.
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Post by englishnguyen on Apr 4, 2023 3:23:52 GMT
Finally, I found out some information about axle nut torque value on Cleveland Manual. It is reference only, not apply for all. We should following the AMM for specified value (which is not concern in my Tecnam AMM) Thanks for all  |
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Post by Ed Midgley on Apr 4, 2023 11:47:06 GMT
I talked to the Cleveland guys at Sun n Fun and they agreed the best way to do it with the locking nut resistance was by feel.
Ed
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