Granite Slipper clutch

[RC Frank]

https://www.arrma-rc.com/interactive-exploded-view/ARA102720T1

View attachment 89886

Thank you so much! This community is awesome

 

[GRC]

I am seeing the same thing now. Like on the inside rear cover of the power module there are clear wear marks from the spur gear. I guess it could be dirt trapped in there, but it looks like mine is for sure rubbing a bit. I saw people on here that put shims on that side to prevent that or sealed the gearbox to prevent dirt ingress. I might try that when I have to replace my current spur gear. Until then maybe it will just wear a groove that sorts out the problem. Maybe that's a bad plan.

I think it's a common problem. I have a faint circle on the rear cover of the power module also. The spur gear spins freely so it can't always be rubbing, but bumps, jolts and flexing probably causes contact. I recently put in some shims, it should help. The black plastic powder that collects inside the power module can cause problems. I had a motor bearing seize up and ended up needing a replacement motor. The bearing had that fine black plastic powder all over it.

 

[RC Frank]

I think it's a common problem. I have a faint circle on the rear cover of the power module also. The spur gear spins freely so it can't always be rubbing, but bumps, jolts and flexing probably causes contact. I recently put in some shims, it should help. The black plastic powder that collects inside the power module can cause problems. I had a motor bearing seize up and ended up needing a replacement motor. The bearing had that fine black plastic powder all over it.

What kind of shims (style and size) should I get and what side of the clutch did you put them on?

That shouldn’t be possible, unless you forgot the plate or pads in the assembly. I would take it all apart and lay the parts of the slipper in order in which they are assembled and compare that to the exploded parts diagram.

Eben the new slipper is doing the same thing. It came assembled

So it seems like when I put it all back together the spur gear is rubbing against the plastic housing

Here's the video

https://streamable.com/djqn2w

 

[GRC]

What kind of shims (style and size) should I get and what side of the clutch did you put them on?

They go on the outside of the bearings. In between the slipper clutch bearings and the power module casing. One on each side worked for me.

I got these, they work well, outer diameter fits perfectly

Then I used half a dozen of these HPI shims [15x12x0.5] on either side to stop most of the massive play I had between the spur and motor mount casings and they fit perfectly: HPI-101291

Another post I saw recently also recommended these, which may have a better fit on the inner diameter

I got these for my slipper. Says they’re made for bearings.

Calandra Racing 4740 10mm Inside Diameter Bearing Shims

I'm not sure if that noise in your video is from the slipper slipping or contact with the plastic housing. Is the slipper screw secure? Are your bearings rolling freely?

If it is contact with the power module, it should show up in marks on the inside of the power module. Can you take a photo of the inside? If there is contact, the shims should help. If there's contact, also check that if the aluminum motor mount is completely flat. Mine was flat, but I noticed the slipper was still not really centered. I replaced the plastic power module and it now it is centered. I think my power module got a bit tweaked over time. Take a picture of the bottom to see if the slipper is sitting correctly once the module is closed up.

 

[RC Frank]

They go on the outside of the bearings. In between the slipper clutch bearings and the power module casing. One on each side worked for me.

I got these, they work well, outer diameter fits perfectly



Another post I saw recently also recommended these, which may have a better fit on the inner diameter

I'm not sure if that noise in your video is from the slipper slipping or contact with the power module. Is the slipper screw well loc-tited? Are your bearings rolling freely?

If it is contact with the power module, it should show up in marks on the inside of the power module. Can you take a photo of the inside? If there is contact, the shims should help. Also check that if the aluminum motor mount or the plastic power module casing may be bent/tweaked. First, check that the motor mount is completely flat. Mine was, but I recently replaced the power module casing because I noticed the slipper was still really not centered in the module. Take a picture of the bottom to see if the slipper is sitting correctly once the module is closed up.

It is hitting induce the power module. I can see powder building up from it grinding inside

 

[GRC]

It is hitting induce the power module. I can see powder building up from it grinding inside

OK then check the aluminum mount and get the shims. If it still rubs, it may be the plastic housing. Oh, you should also make sure the screws attaching the aluminum mount to the motor are secure. And finally, is the motor pinion wobbling at all?

 

[RC Frank]

OK then check the aluminum mount and get the shims. If it still rubs, it may be the plastic housing.

Ordered the shims ?

 

[RC Frank]

They go on the outside of the bearings. In between the slipper clutch bearings and the power module casing. One on each side worked for me.

I got these, they work well, outer diameter fits perfectly



Another post I saw recently also recommended these, which may have a better fit on the inner diameter

I'm not sure if that noise in your video is from the slipper slipping or contact with the plastic housing. Is the slipper screw secure? Are your bearings rolling freely?

If it is contact with the power module, it should show up in marks on the inside of the power module. Can you take a photo of the inside? If there is contact, the shims should help. If there's contact, also check that if the aluminum motor mount is completely flat. Mine was flat, but I noticed the slipper was still not really centered. I replaced the plastic power module and it now it is centered. I think my power module got a bit tweaked over time. Take a picture of the bottom to see if the slipper is sitting correctly once the module is closed up.

You might be on to something. It's not flat, left side is a little raised.

 

[GRC]

You might be on to something. It's not flat, left side is a little raised.

Take out the motor mount and lay it on a flat surface, you'll be able to tell. I haven't had to do it, but others have pounded it straight again.