4200XL Pump Motor Problem

[cdm]

seriously guys? it is the exact same thing. if he got the other one apart already, it takes a second to notch it where the screw(s) sit. in his case 2 of them. rc4 likely had a bad batch or a cheap/newer one. i have had issues with them too with various parts.

here i just took apart one of my brushless to show you



you can locktite it all day long and it wont hold. you need an ident for the screw to grab. else it will spin 9 out of 10 times especially on these high torque motors.

now im surprised you dont see the marks of the screws grinding against the shaft, right? any of those there?

if not, there could be a thread issue on the housing and it isnt deep enough to allow the screws to go all the way down to grip.

[A1 Dirt]

For those of you who didn't understand what I was trying to explain, I posted a video.

http://www.youtube.com/watch?v=34Hnd6FftW4

RC4WD sent a second replacement motor. It ran fine for a few minutes, then began to slip. Some where along the line the set screws were kicked out. I did a little drilling and used some cone point set screws. The problem seems to be fixed, so far.
The bell housing seems to be press fit on the shaft. The set screws do little more than fill the holes. It's not an easy task to disassemble the motor.

Thank you all for your suggestions and comments.

[ihbuilder]

you did the right thing with a cone point set screw . I highly doubt a flat will keep it from running off the shaft like that . that motor does seem to have excess vibration . could be crap bearings a batch of bad mag cases (running out )

[A1 Dirt]

The cone points did not hold.

As a last resort, I used Loctite 290 as a retaining compound. So far, it's held through four batteries. Hopefully that was the fix.

There is still some intermittent noise when the motor/pump is under load. You do not hear this noise in the video. It's much louder. Since the motor is running OK, I now believe the source of the noise is the hydraulic pump.

There is no air in the system so that's not the problem. It's probably bearings going out.