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PilotPin · 10-11-2016, 08:25 PM

I think I have some problem in the drive train on my 300x. The tail has a jerk in it. The higher the head speed the worse it is. I usually fly at 75% throttle curve . Today I set it up higher and the tail started jerking and moving around to the left - nose right - almost uncontrollable . At lower head speed it flyable . It's not vibration . Its more like something is hanging up now an then. I have taken the tail apart and checked bearings, checked main bearings, and motor bearings. Check the belt and anything else I though might have an interference . Anyone have other ideas???

Morrchew · 10-11-2016, 08:49 PM

I would try resetting the tail endpoints in the AR7200 if your running run

Indokast · 10-11-2016, 10:08 PM

Might try new tail servo?

Birdstrike · 10-13-2016, 04:00 PM

Check main gear motor pinion mesh as well as tail belt tension and belt teeth.

Worse case scenario, the pulleys might need replacing

PilotPin · 10-15-2016, 08:06 PM

I pulled the motor back. Then spun it by hand I could here a faint ticking sound . I could feel it inthe frame close to the main shaft. Took it apart I found a burr on the pull that drives the tail. It got there from a previous repair where I had to use a pliers to get the pull on the metal hub. Thought I had it all cleaned up.

I made 4 flights today and it all seemed good.

PilotPin · 10-24-2016, 08:04 PM

I made some more flights with the 300x . I noticed just before it lifted the sound of the motor was going up and down. Examined the motor and the bearing were going bad. Changed to a spare motor I had and changed the main shaft bearings . Good again . Probably when the tail was acting up was from the motor bearings not being smooth.

10-11-2016, 08:25 PM	#1 (permalink)
PilotPin Registered Users Join Date: Dec 2015 Location: Indiana	300x drive train problem. I think I have some problem in the drive train on my 300x. The tail has a jerk in it. The higher the head speed the worse it is. I usually fly at 75% throttle curve . Today I set it up higher and the tail started jerking and moving around to the left - nose right - almost uncontrollable . At lower head speed it flyable . It's not vibration . Its more like something is hanging up now an then. I have taken the tail apart and checked bearings, checked main bearings, and motor bearings. Check the belt and anything else I though might have an interference . Anyone have other ideas???

10-11-2016, 10:08 PM	#3 (permalink)
Indokast Registered Users Join Date: Mar 2014	Might try new tail servo? __________________ cheers

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10-11-2016, 08:49 PM	#2 (permalink)
Morrchew Registered Users Join Date: Jul 2014	I would try resetting the tail endpoints in the AR7200 if your running run

10-13-2016, 04:00 PM	#4 (permalink)
Birdstrike Registered Users Join Date: Sep 2013	Check main gear motor pinion mesh as well as tail belt tension and belt teeth. Worse case scenario, the pulleys might need replacing

10-15-2016, 08:06 PM	#5 (permalink)
PilotPin Registered Users Thread Starter Join Date: Dec 2015 Location: Indiana	I pulled the motor back. Then spun it by hand I could here a faint ticking sound . I could feel it inthe frame close to the main shaft. Took it apart I found a burr on the pull that drives the tail. It got there from a previous repair where I had to use a pliers to get the pull on the metal hub. Thought I had it all cleaned up. I made 4 flights today and it all seemed good.

10-24-2016, 08:04 PM	#6 (permalink)
PilotPin Registered Users Thread Starter Join Date: Dec 2015 Location: Indiana	I made some more flights with the 300x . I noticed just before it lifted the sound of the motor was going up and down. Examined the motor and the bearing were going bad. Changed to a spare motor I had and changed the main shaft bearings . Good again . Probably when the tail was acting up was from the motor bearings not being smooth.

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