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HomeAircraftHelicopterAlignT-REX 700N › Replacing main shaft bearings
03-10-2010 03:19 AM  8 years agoPost 1
AcidKindred

rrApprentice

Mobile, AL - USA

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The bearings I have are a tight fit. On both the main shaft and in the nearing holder. Do you guys heat up the holder AND bearing or another method? How do you press it in?

Thx

Compass Atom 500
Align T-Rx 250SE
Novus CP

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03-10-2010 06:37 AM  8 years agoPost 2
ball link

rrNovice

Tenn.

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bearings
I allways take a propane torch and heat it up and take a wooden dowel and pop it out let it cool down while i do the other , and then repeat the heating up process to put the other new bearings in , if you do this you have to do it fast , just make sure the bearings are all the way down in the seat and flush on the top.
Some guys heat the bearings up in an oven and pop out and pop in. Heating up the holder expands it, and putting cold bearings in helps it slide in faster.

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03-10-2010 12:56 PM  8 years agoPost 3
AgentOrange

rrVeteran

Jacksonville, Florida

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they shouldnt be that tight i have never had a problem getting mainshaft bearing out of the bearing blocks. Those are aluminum and if you heat them up to much you could warp them trying to beat out the bearing if not careful. Sounds like the bearing block or the bearing itself has a bur or imperfection some where thats not allowing it to go into the block right. try another main shaft it could be bad from the factory i have had that happen to me with Align shafts and JR shafts.

Trying not to put them in the dirt.

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03-10-2010 02:12 PM  8 years agoPost 4
sinte

rrVeteran

Tacoma,WA

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i had to heat my blocks up with a heat gun, tap the old bearing out while having the new bearings in the freezer, then put the new bearings in while the block was still warm

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03-10-2010 02:42 PM  8 years agoPost 5
marc8090

rrElite Veteran

Long Island, N.Y.

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Put the entire thing in the oven and heat for a few minutes at about 350 degrees. The bearing should pop right out and then put the new one in right away. Freezing the bearing is usually not necessary.

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03-10-2010 06:02 PM  8 years agoPost 6
AcidKindred

rrApprentice

Mobile, AL - USA

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thx

Compass Atom 500
Align T-Rx 250SE
Novus CP

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03-11-2010 01:51 AM  8 years agoPost 7
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

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I used my heat gun. It has 2 settings - I used the low setting.

In 40 seconds of heating, the bearing popped out with a wooden dowel.

I reheated the bearing block, and I popped in the fresh new bearing.

Cake!

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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03-11-2010 03:20 PM  8 years agoPost 8
nwolsink

rrApprentice

Ruurlo-Netherlands

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The oven usually works best for me 2, I do the same with engine bearings, they fall right out and you can drop the new in right in

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