gear shaft bearing disintegrates

[ivorz]

One of my gear shaft bearings disintegreted. I noticed that the front main gear had moved down and was eating into the plastic. How did this happen? There were metal filings all over the place. I don't fly 3d, just basic sport flying.

I am going to order new ones, but if there is a fix for this I would love to here about it.

Thanks

[Drew816]

Welcome! Not sure on this one, I'll let the experts chime in but hopefully the blown bearing didn't eat your frame or cause any other damages.

So how many flights were on this bird before this happened?

How often should we all replace these bearings? Once a season?

Should we upgrade to Boca's and never have to worry about them again or what?

Happy Flying!

[ivorz]

Welcome! Not sure on this one, I'll let the experts chime in but hopefully the blown bearing didn't eat your frame or cause any other damages.

So how many flights were on this bird before this happened?

How often should we all replace these bearings? Once a season?

Should we upgrade to Boca's and never have to worry about them again or what?

Happy Flying!


The rest of the bird is fine. I caught it after landing and inspecting the heli.

I don't think I have more than 100 flights on it.

Could it be that when I put the bearings into the frame I did not glue them in. The reason it did this was so that I could remove them without taking the frame apart.

[skigolfmike]

When I started stripping gears I noticed the bearing on the OWB shaft were pretty much toast. They had a lot of play and were allowing the main gear to move a lot. I had about 50 flights on those bearings. I replaced with stock for now. However, I have Boca Ceramic Hybrids coming for the OWB shaft and the main shaft.

[ivorz]

just some FYI. I had upgraded to the motor mount with bearing and longer shaft.

[Drew816]

Did you miss installing a spacer or something in your rebuild? I think the two assemblies are different so be sure to review the Finless videos and the manual to be sure you've got all the right parts.

Can anyone confirm this?

[ivorz]

Nope, I had the spacers installed correctly.
I also watched the finless vids over and over.

[PeterM789]

I had the same problem. With Hurri #1 (Plastic frame) after approx. 20 flights, with Hurri #2 (CF) after approx. 50 flights. It looks to me it's another weak point of the Hurricane.

I have the problem only with the front shaft bearings, the main shaft bearings are fine.

Currently replaced using stock bearings, but I will try better bearings next time. Hopefully this will resolve the issue.

Peter

[ivorz]

Perhaps Gaui would like to chime in at this point. Hopefully they are monitoring this thread.

[ukgroucho]

Yup... I had the same issue - and it caused my CF to eat the front gear because the shaft would move around, cause the pinion to gear mesh to be screwy and shred the front gear.

[ivorz]

I am ordering new bearings and someone had mentioned replacing the one way bearing with the 20T version. If I do this do I need to change any of the other gears. Everything else is stock on the heli at the moment.

[skigolfmike]

The top bearing on the mainshaft was pretty notchy after my tail failure crash, so I replaced that too. My 550 is running really smooth right now.

I'm still going to replace the OWB bearings and main shaft bearings when I get the Boca Hybrid Ceramics.

[ivorz]

I received new bearings today and have some quick questions:
1. Should I glue the bearings to the frame. I had not done this in the past as it makes it easier to replace without having to seperate the frames.
2. I ordered a 20T one way. If I use this, do I have change the other gearing. I was using a 19T and the other gears are standard.

[mysticmead]

if you didn't have a problem in the past of the bearings spinning in the frame then don't worry about gluing them in. if you want to make sure they don't rotate, use some goop to glue them in. you can still remove them without taking the frame apart. of course you'll destroy them removing them..

as far as the 20T OWB.. they work great with the stock gearing.. you also get about 100RPM more just by changing to a better OWB

[ivorz]

Man, am I confused now.
Can someone show me how the shaft goes together with the bearings and all the other parts. There are additional washers that come with the bearings (2) where do I insert them. I looked at the finless vid but don't see it there. I am using the longer shaft with motor mount/bearing mod.

Here is the order I have it in from top to bottom. Exluding the motor mount portion.
Where do the Washers go??
Gear
collar
top bearing
One Way Bearing
Bearing

[mjdee14]

Man, am I confused now.
Can someone show me how the shaft goes together with the bearings and all the other parts. There are additional washers that come with the bearings (2) where do I insert them. I looked at the finless vid but don't see it there. I am using the longer shaft with motor mount/bearing mod.

Here is the order I have it in from top to bottom. Exluding the motor mount portion.
Where do the Washers go??
Gear
collar
top bearing
One Way Bearing
Bearing


The wahers go on the top and the bottom of the one way bearing.....you cannot get the bearing in with them sitting on the OWB. You must use a little grease to stick the washers to the bearings....theres is just enough of a recess to then allow the OWB to be inserted between the washers.

[mysticmead]

there was a little info sheet in my kit telling me that only one washer was needed now.

[Graeme67]

I have had the middle bearing of the OWB shaft collapse on my hurri. It was after 200 flights & at least 5 crashes in which the 42t gear was stripped 3 times. I noticed a squealing nose & on closer inspection noticed it. It's easy to replace - you don't have to split the frame. Just loosen the bolts around the bearing housing.

My main bearings have some notchiness for the last 150 flights now. I add a drop of oil to both of them occasionally - it seems to keep the running fine.

The 2 larger bearings on the OWB shaft are very "fine" bearings. They aren't very substantial so I'm expecting to have to keep an eye on them. Crashes which strip the front gear would place a lot of load on them and bring about there premature demise.

Cheers
Graeme

[ivorz]

Just got back from the field after replacing the bearings, shaft and OWB. I put in the 20T OWB and after the flight it was hot. I could put my finger on the OWB but after a few seconds my finger was tingling from the heat.

Is this normal?
Should I have changed the main gear for a smaller one? I have the std 61T
Should I go back to the 19T?