2 gearboxes 2 gear diffs both bind?

[MikePimlott]

Whilst in mid motor configuration i have tried 2 new gearboxes and 2 gear diffs and when the gearbox is tightened up it binds?

ball diff in both gearboxes works fine but both gear diffs are not allowing me to fully seal the gearbox.

any ideas? ,there is no side to side movement in the gear diff so is it just too big ?

[cryer-evo]

i did find that my self just nip up gear box and run it it will free up with time

[nicmo]

just unscrew a wee bit the gearbox screws and it will be fine.

[MikePimlott]

Originally Posted by nicmo

just unscrew a wee bit the gearbox screws and it will be fine.

Yep i did that, but when you screw it into the chassis it tightens back up again.

[Adyb]

Hi,

Did you solve the problem, if so how? cos I got the same issue.

Thanks.

[cunawarit]

I had that issue, I simply loosened the screws until it freed up.

[Adyb]

Hi,

I tried that which is fine out if car. As comment above as soon you screw the gearbox to chassis it tightens up again.

Thanks.

[Robby]

Originally Posted by Adyb

Hi,

I tried that which is fine out if car. As comment above as soon you screw the gearbox to chassis it tightens up again.

Thanks.

I've had four different 22's, multiple different gearbox cases, used both balldiffs and geardiffs - and not a one of them have bound or tightened up.

My guess is that you've warped the plastic as a result of overtightening the screws. These screws only need to be snug, NOT tight (the ones into the alloy motor mount can use a dab of loctite). But once you've warped the plastic you've ruined the parts, and they have to be replaced.
Do as others have suggested and buy new gearbox halves, and assemble and re-install WITHOUT overtightening any of the screws. I'll bet your "problem" will be solved.

[MikePimlott]

Originally Posted by Adyb

Hi,

Did you solve the problem, if so how? cos I got the same issue.

Thanks.

No, the geared diff is too big for the gearbox. When the gearbox halves are screwed together it pinches the bearings and creates tight spots. The only way around it is to loosen the gearbox screws until the diff turns free, but be carefull because when you screw it back into the car it can tighten up again as the halves pull together in the blocks.

Originally Posted by Robby

I've had four different 22's, multiple different gearbox cases, used both balldiffs and geardiffs - and not a one of them have bound or tightened up.

My guess is that you've warped the plastic as a result of overtightening the screws. These screws only need to be snug, NOT tight (the ones into the alloy motor mount can use a dab of loctite). But once you've warped the plastic you've ruined the parts, and they have to be replaced.
Do as others have suggested and buy new gearbox halves, and assemble and re-install WITHOUT overtightening any of the screws. I'll bet your "problem" will be solved.

I have done this twice now and both have not been over tightened nor have any of the parts warped.

The first gearbox i noticed the lid on the gear diff had been over tightened and the plastic had "butterflied" kind of so i bought a new one, this lid was straight and it still bound, as stated above its pinching the bearings not binding on plastic.

If i put the ball diff in everything runs free.

[Robby]

Originally Posted by MikePimlott

No, the geared diff is too big for the gearbox. When the gearbox halves are screwed together it pinches the bearings and creates tight spots. The only way around it is to loosen the gearbox screws until the diff turns free, but be carefull because when you screw it back into the car it can tighten up again as the halves pull together in the blocks.



I have done this twice now and both have not been over tightened nor have any of the parts warped.

The first gearbox i noticed the lid on the gear diff had been over tightened and the plastic had "butterflied" kind of so i bought a new one, this lid was straight and it still bound, as stated above its pinching the bearings not binding on plastic.

If i put the ball diff in everything runs free.

I have geardiffs in two of mine, know of their use by countless of others with no complaints - which leaves the common denomintor being that you must be doing something wrong. Sorry, but something's just not adding up with your story.

Are you sure you're even using the correct geardiff?

[MikePimlott]

Originally Posted by Robby

I have geardiffs in two of mine, know of their use by countless of others with no complaints - which leaves the common denomintor being that you must be doing something wrong. Sorry, but something's just not adding up with your story.

Are you sure you're even using the correct geardiff?

common denominator being me + the others below who are having the issue ? and the others i have spoke to who have encountered the same thing (one being a team driver who told me to run the gearbox looser or run the ball diff)

maybe you're just special

[Robby]

Originally Posted by MikePimlott

common denominator being me + the others below who are having the issue ? and the others i have spoke to who have encountered the same thing (one being a team driver who told me to run the gearbox looser or run the ball diff)

maybe you're just special

Maybe, along with all the countless others that haven't had the issue.

If a "team driver" supposedly told you what to do, I don't understand why you're asking here.

[MikePimlott]

Originally Posted by Robby

Maybe, along with all the countless others that haven't had the issue.

If a "team driver" supposedly told you what to do, I don't understand why you're asking here.

I asked here back in February, and i only replied to this thread as it has been brought back up again 21 hours ago.

[budfish]

Originally Posted by Robby

Maybe, along with all the countless others that haven't had the issue.

If a "team driver" supposedly told you what to do, I don't understand why you're asking here.

Who cares gear diffs are for wimps

[MikePimlott]

Originally Posted by budfish

Who cares gear diffs are for wimps

Trust You lol, You know i have a ball diff as well

Anyway, whilst playing tonight ready for Sunday i measured this:




Sorry for the huge crappy iphone pics but im a tad inebriated, Anyways i believe this to be my issue, when screwing the Gearbox up the geardiff goes tight, the ball diff does not.

[Adyb]

Hi,

Yeap I measured the same as you.. Was talking to nice TLR representative Tuesday night and he had no issues with fitting his gear diff. Then he mention he sanded down the "Top hat" side by about 0.5mm to give the diff a smoother action as it was felt the gears were just touching each other. By gently sanding this side down (800 grit) it allows the crown gear to sit closer to the internal gears.
So measured his geared diff and would you know it, it measured 17mm!!

Not had time to do it yet but feel this is the answer and root cause.
Thanks.

[sly]

Originally Posted by MikePimlott

Trust You lol, You know i have a ball diff as well

Anyway, whilst playing tonight ready for Sunday i measured this:





Sorry for the huge crappy iphone pics but im a tad inebriated, Anyways i believe this to be my issue, when screwing the Gearbox up the geardiff goes tight, the ball diff does not.

Clean your nails Pimlott
My din dango had the oversize problem in width even on the second batch of geared diffs. So I got a knife on it and took some material away.
What you really need is a hobao

[MikePimlott]

Originally Posted by Adyb

By gently sanding this side down (800 grit) it allows the crown gear to sit closer to the internal gears.
So measured his geared diff and would you know it, it measured 17mm!!

Not had time to do it yet but feel this is the answer and root cause.
Thanks.

Thanks, thats a good idea

Originally Posted by sly

Clean your nails Pimlott

Done, sorry been a long hard working week

Originally Posted by sly

What you really need is a hobao

Second person to say that in 2 days

[Spencer Mulcahy]

Originally Posted by MikePimlott

Thanks, thats a good idea



Done, sorry been a long hard working week



Second person to say that in 2 days

Hobao H2 car number 673 in the Pimlott garage

[sly]

Originally Posted by Spencer Mulcahy

Hobao H2 car number 673 in the Pimlott garage

Doesn't surprise me.