E-620 screeching noise

[Emile]

Hi,

Hmm... Only the presure roll & pulley in the tail i didn't echange yet
The 2 red pressure rolls in front i already exchanged ... no result

I'm almost sure in my case it is caused by the defective motor bearing, but i'm really sure if i have tried the brandnew (loan) motor.

Kind regards,
Emile

[helicraze]

I had the same, turns out the pinion must be butted up againt the motor bearing. Took me a few months to realise that!!!

Problem solved as soon as i did it.
This is only applicable on the Z motors as there is no clip to hold the shaft.

[Vinger]

I had the same, turns out the pinion must be butted up againt the motor bearing. Took me a few months to release that!!!

Problem solved as soon as i did it.
This is only applicable on the Z motors as there is no clip to hold the shaft.
Screeching noise is caused by the motor can moving up or down on the Z50 motors. You have to put the pinion up against the bottom motor bearing, preferably by shims or washers with the correct OD, so that the don't touch the outer race. The motor can moves when you pitch pump or when the Heli experience a change in g-forces. This is even covered in the Z-motor instuctions.

[Emile]

Hi,

Today i tested the new Z-motor, i took care to remove all axial play and the noise was indeed complete gone. I couldn't test it with my old motor because it's waiting for new bearings. Maybe they where still OK, but once they are out only new ones will get in. :)

It's strange that my old motor initially with axial play (1mm) was quiet so the TERRIBLE NOISE must also have something to do with WEAR (motor-axis?). I'm happy i know where to look for now ... thanks for the help. I will report again if my new bearings arrive!

Kind regards,
Emile

[helicraze]

Great to here! I think this it has damaged my bearings cause in the beginning i didn't slide the pinion up and now my motor is noisy!

[Emile]

Another update ...

While waiting for the new bearings to arrive I thought, let’s also check the motor condition of my newest E620 heli. It’s 3 months old and also starting to screech a bit. Once I opened this motor I was SHOCKED … the motor shaft had been slipping inside the front bearing and is now at least 0.03mm thinner!

I'm convinced SLIP of the motorshaft is the real cause for my problems, maybe it has innitially to much play. So I also started to look for a replacement shaft, but I didn’t see a screw to remove the old one and also by applying a little bit heat on the ALU the old axis wouldn’t come loose. So I decided not to force anything and send both motors back for analysis & root cause.

My 2 Raptors are now without Motor ... hmz, let's hope TT come up with a good solution.

To be continued ...
Emile

[helicraze]

Loctite have great products that will take up that tolerance no problem. I would just re assemble it with loctite

[Emile]

I would just re assemble it with loctiteI'm considering this with my 3th E620, which is also starting to screech a tiny tiny bit after only 25 flights. This one is still in my Bell 222 ...

I was planning to disassemble it anyway, to build in nice navigation lights :)

And of course I will post the results if TT has ended the investigation ...

Emile