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HomeAircraftHelicopterHelicopter Main Discussion › blade grip bearings
05-14-2011 06:13 AM  7 years agoPost 1
n8leon

rrNovice

Cupertino, CA

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My main blade grips were rotating pretty roughly after yesterday's Unscheduled Landing, so I was pretty sure my thrust bearings were shot, especially since they weren't in great shape before the crash.

I replaced them tonight, but it still feels rough/grinding/choppy to turn the blade grips. It is possible to over-tighten the cap screws? I recall I usually turn both screws against each other until they stop turning.

I did apply plentiful Silicone Grease to the thrust bearings, verified that I have the "IN" and "OUT" sides oriented correctly, and re-assembled it three times double-checking against the manual to make sure I had the parts in the right order.

Is there anything else I could have done wrong, or do I probably have shot bearings in the blade grips as well? Can those being bad make the blade grips feel so rough?

My LHS guy said, "I'll bet your other bearings are bad, too."
Shoulda' listened to him. :-P

Thanks,
n8

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05-14-2011 06:22 AM  7 years agoPost 2
gotnoclue

rrApprentice

sydney

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yeah the radial bearing are most likely shot too, most decent crashes with ruin the radial bearing in the blade grips.

take the blade grip off and rotate the bearings with your finger tip, if it feels notchy then replace it.
remember the loctite on reassembly.

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05-14-2011 06:23 AM  7 years agoPost 3
Dr.Ben

rrMaster

Richmond, VA, USA

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Absolutely.

Blade grip radial bearings can become notchy and give the feel you describe. You also have to be careful with some styles of feathering spindles with stepped ends. On that kind of spindle, it's really easy to collapse the stepped end's tip just enough to preload the thrust races even when you haven't used gorilla torque. The early X-Cell 50/60 spindles were infamous for this.

I'd go back and replace the radial bearings as well. If the model has a stepped tip spindle, replace it as well.

Oh yeah.......pull the mainshaft and check its bearings too. If they've been in there any amount of time and the model went through any kind of altercation, I'll be you they are notchy as well.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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05-14-2011 06:33 AM  7 years agoPost 4
n8leon

rrNovice

Cupertino, CA

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Yeah, this is a TRex 500, so it does have the stepped feathering shaft. I did buy a new set of 2, but didn't replace it. I will now.

Looks like I'm heading back to the LHS tomorrow. :-P

Thanks,
n8

P.S. Thanks for the loc-tite reminder. I did remember, but I'm always nervous working with it in this spot, buried under all these bearings! This time I put a drop inside the spindle and pushed it down into the threads with a toothpick, and then wiped off the outer edges of the shaft. Seemed to work OK.

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05-14-2011 08:05 AM  7 years agoPost 5
jackheli

rrProfessor

Vancouver - Canada

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Pull the grips outwards. If they smooth out you are okay. If there is any grinding whatsoever the radial bearings are shot.

It's easy to find an excuse to do wrong. Hard is not to find an excuse to do right.

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05-14-2011 03:17 PM  7 years agoPost 6
JOLT

rrVeteran

Baltimore, MD

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You might want to fly it. After I pull the head apart, clean/regrease the thrust bearings, and replace the dampeners it is always a little on the snug notchy side. Couple flights in idle up loosens things up as the excess grease works its way out.

I can always tell how things are doing by the flybar, after a rebuild. The flybar is stiff for the first few ups and then begins to see-saw more and more easily.

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05-14-2011 03:20 PM  7 years agoPost 7
flyride

rrKey Veteran

Salt Lake City UT

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Pull the grips outwards. If they smooth out you are okay. If there is any grinding whatsoever the radial bearings are shot.
1+ When they are installed mine always seem to be a touch notchy feeling if there in no force on them but if pulled out as if the weight of the blades at full speed is on them they are smooth. You can replace the other bearings but my guess will be that they will still feel slightly notchy until outward pressure is applied.

and the blonde said "RECTUM, Hell damn near killed em!!"

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05-21-2011 08:51 PM  7 years agoPost 8
n8leon

rrNovice

Cupertino, CA

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By way of follow-up, I tried your suggestions...
I pulled on the grips and turned them and could still feel the grinding, so I replaced the radial bearings this week.
Now they feel a little rough, but when I pull on them while turning, they are smooth.

Good tip - thanks!
n8

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