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Blade SR Blade Grip Repair - 3/18/2010 1:25 AM   
c9403


 

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From: Lees Summit, MO, USA
Status: offline 		Ok guys, I had another crash on my blade SR as I continue to struggle to learn.

I now need to put a new tail boom on and I think I am ready to attempt that.  However, last night during a crash, I broke one of the blade grips.  Specifically, I broke off the little bump out that holds the linkage going on up to the flybar paddles.  In order to repair it, I have to remove the blade grip and maybe replace one of the small linkage parts.  But, when I turn the screw that holds the blade grip to the main shaft / head, it just spins.  Is there a secret to removing this screw to get the blade grip to come off?  Do I need to hold something on the other side or have I damaged something that is causing the screw to spin?

Thanks in advance,

Chris


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RE: Blade SR Blade Grip Repair - 3/18/2010 1:59 AM   
Ddaddy


 

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Status: offline 		Yep, allen wrench on other side. It's supposed to do that. When you turn it, does the blade grip wobble? If so, replace feathering pin too.

Ken 

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RE: Blade SR Blade Grip Repair - 3/19/2010 9:18 PM   
46u



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Status: offline 		Yes Ddaddy is correct and I recommend you take the whole feathering shaft out and make sure it is not bent. So far I have bent 2 of them. One time I though there was not any damage till it would not take off and come to find out the feathering shaft was bent.

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RE: Blade SR Blade Grip Repair - 4/3/2010 2:39 AM   
a.davis


 

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From: Cedar Hill, TN, USA
Status: offline 		I also am having to replace my main blade grips on my Blade SR. The original feathering shaft was so bent that one of the bearings wouldn't come free of the shaft.
I purchased the "Bell Mixer Upgrade Kit: BCP", part #EFLH1170, as my hobby shop owner said it would work on the BSR as well.

My question is, after disassembling the old and rebuilding the entire mixer assembly, there is still a LOT of play in the blade grips.
I'm not sure if the replacement part came with all the shims, rubber o-ring, etc. I need. According to the exploded parts view, I have everything assembled correctly. It's torqued down and as tight as it needs to be.

So, why the excessive play?

First post here, I heard this was a great site for info.
Thanks!

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RE: Blade SR Blade Grip Repair - 5/17/2010 2:39 PM   
bldrums



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From: C-Ville, VA, USA
Status: offline 		well one more bent feathering shaft repair question,
I'm good up to the point of having taken the shaft out. I have 3 step washers , but I am pretty sure one side only had one step washer and one flat washer. Looking at the parts explosion ( with a magnifing glass ) Im still not sure what i should have.


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RE: Blade SR Blade Grip Repair - 5/18/2010 5:52 AM   
Doug47


 

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quote:

One time I though there was not any damage till it would not take off and come to find out the feathering shaft was bent.

I've done that one, and when the swash plate pops apart it'll do the same thing, lots of rpms but no take off !
quote:

So, why the excessive play?

Good to have you !
quote:

Looking at the parts explosion ( with a magnifing glass ) Im still not sure what i should have

Here's why-The exploded view only shows half the spacers,etc.
This'll do it.
On the long bolt:
1. very smallest in diameter washer.
2. Step washer, 'step' always goes toward bearing. If somethings touching a bearing,it's a step washer.
3.Slide the long part of the shaft through the grip.
4.Another step washer.
5. 3 shims.
6.Step washer.
7. Both o-rings.
8. 3 shims
9. Step washer.
Slide this assembly through a grip, make sure grips nut will be on bottom of grip.

On the short bolt:
1. The smallest washer
2. Step washer (remember, ridge always toward bearing)

Now screw bolt with its two washers through the second grip and into the long bolt. The slop should be gone, and like the guys said you need two 1.5mm allen drivers to tighten things up, and if you rotate the shaft and it wobbles it's bent.
Make sure the blades aren't too tight. From what the experts who've shown me so far is they need to be JUST barely tight for no freeplay to be there, but not so loose that they will flop too and fro,Johnson like, with only gravity required.
Doug

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RE: Blade SR Blade Grip Repair - 5/18/2010 2:44 PM   
bldrums



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Status: offline 		yike, finally sorted all the parts in order by the manual and everything looks in order except the brass spacer #25. I have one unidentified part thats plastic, small block with a hole through it (a rubber o-ring would fit in it.) I believe it fell out of one of the blade grips but there is only one. Dont see a brass part at all (spacer ) so I wonder if there was a change in production? Sorry to be so vague the heli has so many small parts, its a little confusing the first time.

thanks,
Bill


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RE: Blade SR Blade Grip Repair - 5/18/2010 3:54 PM   
Doug47


 

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Status: offline 		Bill :
There are two different brass spacers where you're working.
There's one on each control arm that's attached to the blade grip found under the mounting/pivot screw that holds it to the blade grip.
One each go in the blade grips themselves.
From inner to outer, with nothing to do with any of the washer/shim/o-ring business the order is bearing-spacer-bearing-bearing.
Doug

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RE: Blade SR Blade Grip Repair - 5/18/2010 5:10 PM   
bldrums



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Status: offline 		Doug,
Thats a big help, I didnt see that it could get to complicated to begin with but the
manual diagram can be a little confusing.
The only thing left over is that small block with a hole through it (a rubber o-ring can fit in it.) It fell out when I turned the heli upside down and I dont see another one. I will have to take a closer look after work. Hate it when I finish a repair and .....have left over parts


Thanks ,
BL


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RE: Blade SR Blade Grip Repair - 5/19/2010 12:33 AM   
Doug47


 

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Status: offline 		I'm gonna look for that darn little block. If you fond it first..let me know ! Doug

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RE: Blade SR Blade Grip Repair - 5/19/2010 4:08 AM   
bldrums



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Status: offline 		its probably a part left out of my last project !!..........no, my bad terminology, sorry, its more like a cylinder shaped cap , found it to be (007 EFLH1512 Center Hub Cap )

Now , long bolt short bolt...? I have two bolts that go on the spindle / feathering shaft and those are both the same length. Bolt small washer to spindle shaft , slide the step washer on and slide that assembly though both 027 blade grips, I'm with you so far. What lost me was 025 Brass Spacer on the explosion also looks to be on the spindle.
Anyway , those two brass spacers are on ( control arm /mounting pivot screw) ? dont see that but its not important.
Then,
4.Another step washer.
5. 3 shims.
6.Step washer.
7. Both o-rings.
8. 3 shims
9. Step washer.

and bolt the small washer to the spindle / feathering shaft. right? Stand way back and spool up ..slowly....


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RE: Blade SR Blade Grip Repair - 5/19/2010 4:15 AM   
Doug47


 

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Status: offline 		I was describing that incorrectly, I have the end allen bolt and it's washers screwed together just seated making a long bolt (feathering shaft), put all the stuff on and slide it in, then install the other end bolt onto the feathering shaft.
You'l get it , if you have all those things on you'l have no slop and a very smooth running heli/

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RE: Blade SR Blade Grip Repair - 6/21/2010 9:29 AM   
RCKindaGuy


 

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quote:

ORIGINAL: bldrums

its probably a part left out of my last project !!..........no, my bad terminology, sorry, its more like a cylinder shaped cap , found it to be (007 EFLH1512 Center Hub Cap )

Now , long bolt short bolt...? I have two bolts that go on the spindle / feathering shaft and those are both the same length. Bolt small washer to spindle shaft , slide the step washer on and slide that assembly though both 027 blade grips, I'm with you so far. What lost me was 025 Brass Spacer on the explosion also looks to be on the spindle.
Anyway , those two brass spacers are on ( control arm /mounting pivot screw) ? dont see that but its not important.
Then,
4.Another step washer.
5. 3 shims.
6.Step washer.
7. Both o-rings.
8. 3 shims
9. Step washer.

and bolt the small washer to the spindle / feathering shaft. right? Stand way back and spool up ..slowly....


Leave out #6 above as there is no step washer that is adjacent to the rubber O-rings.  The correct total sequence  from one end of a grip to the other end of a grip is the following:  Note the capitalized headers are identifying what MAIN parts the sequenced parts are assoiated to.

GRIP:

1. Socket Head Cap Screw
2. Flat Washer
3. Step Washer
4. Bearing
5. Bearing
6. Brass Spacer
7. Bearing

FEATHERING SHAFT:

8. Step Washer
9.  Shims (3)

CENTER HUB:

10. Rubber O-Ring
11. Rubber O-Ring

FEATHERING SHAFT:

12. Shims (3)
13. Step Washer

GRIP:

14.  Bearing
15.  Brass Spacer
16.  Bearing
17.  Bearing
18.  Step Washer
19.  Flat Washer
20.  Socket Head Cap Screw

I disaasemble and reassemble the rotor after every RC outing I attend.  I have done this so many times I can do it in my sleep.  But I will admit the very first time I did it the explosive diagram for the SR just didn't help me at all.  The diagram for whatever reason (space maybe) assumes the far side grip assembly so you can be left with the impression that the two grips are assembled differently in parts sequence.  Another thing wrong with the exploded diagram is that they left out the pointers as to where exactly in the main part the sub-parts are located at.  That is why in my sequence list above I list in capitalized letters what the main parts are and what sub-parts are assembled to each of the main parts respectively.

I hope this helps and clears up the diagram and some of the preceding posts.





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RE: Blade SR Blade Grip Repair - 6/21/2010 2:41 PM   
bldrums



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Status: offline 		Absoultely , its a great help for sure.

thanks,

BL


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