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T-REX 450 › The belt jumps onto the tail rotor shaft pulley
03-14-2010 07:15 AM  8 years agoPost 1
BOB WHO?

rrKey Veteran

Downey, Ca.

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After hovering, or even sometimes when spooling up the belt jumps up onto the left side of the tail rotor shaft pulley (from rear). The belt seems to even rub the inside of the tail assembly on the left side. The belt is routed correctly and the belt tension is good. The belt (Gates) appears to be in great shape. Any ideas?

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03-14-2010 07:25 AM  8 years agoPost 2
Heli 770

rrProfessor

USA.

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Did you get rid of the tail pully?

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03-14-2010 07:27 AM  8 years agoPost 3
sjarochos

rrApprentice

plant city,florida

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Is your tail boom straight?

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03-14-2010 01:46 PM  8 years agoPost 4
Gyronut

rrProfessor

Martinsville In.

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What material is the tail pulley..?? Metal or plastic..

I had the same prob once... Metal pulley cured it..

Rick

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03-14-2010 01:53 PM  8 years agoPost 5
Mike71

rrNovice

valparaiso indiana

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Remove tail pulley this should cure it

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03-14-2010 03:20 PM  8 years agoPost 6
BOB WHO?

rrKey Veteran

Downey, Ca.

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Sorry for being unclear. I do still have the 'pulley' with no teeth that rides above the belt to supposedly keep it in track. I was referring to the pulley with teeth that is part of the tail rotor shaft. That is the pulley that the belt rides up on. I'm confused because I just replaced the boom and everything seems straight and square. The belt tension is 'just right', not to loose not too tight. So remove the toothless pulley?

Oh yea, everything is metal

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03-14-2010 03:29 PM  8 years agoPost 7
Funky Trex

rrElite Veteran

Westerville, OH - USA

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Yes, remove the toothless pulley and your problems should go away. That pulley is not needed and usually just causes problems.

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03-14-2010 03:29 PM  8 years agoPost 8
Heli 770

rrProfessor

USA.

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Yes, remove the top pulley that rides above the geared output pulley.

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03-14-2010 03:31 PM  8 years agoPost 9
rcmiket

rrVeteran

El Paso,Texas

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+1 on the pulley removal. Cured my problem.
Mike

"When Inverted down is up and up is expensive"

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03-14-2010 03:38 PM  8 years agoPost 10
BOB WHO?

rrKey Veteran

Downey, Ca.

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Ok I'll try that and post the results. There are so many guys who recommend removing that 'guide' pulley because it is alleged to be useless. I would not care if it was just useless, but if it causes this problem it'll be gone on mine too.

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03-14-2010 03:52 PM  8 years agoPost 11
JeffKollin

rrKey Veteran

Jenison, MI

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I would check and make sure that the tail shaft is a perferct 90 degrees to the heli. What if the tail unit is off and the end of the tail shaft is canted down and that would or might cause the belt to track off to the left of the pully.You did say you replaced the tail boom.

Just my $.02 thats something I would look at. I dont have a problem and I am running the idler pully on top of the tail case.

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03-14-2010 06:24 PM  8 years agoPost 12
dkshema

rrMaster

Cedar Rapids, IA

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Make sure you only have a 1/4 turn twist in the belt.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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03-14-2010 06:40 PM  8 years agoPost 13
BOB WHO?

rrKey Veteran

Downey, Ca.

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Wow I removed the pulley and like magic the problem is gone. You guys are right. When I removed the idler pulley and the belt stays on track. The tail boom is new and is (and was ) perfectly aligned to the boom block. That pulley has never been a problem for me before this situation. I always heard that the said pulley was useless and could be removed. I did not hear though that this pulley can cause belt problems. Now I get it. Not only does it not do any good, it can hurt you. I'm a believer now; Thanks guys!!!!

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