Mato sprocket issue on HL M4A3

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Postby AshMann » Sun Feb 24, 2019 2:50 am

On my newer HL Sherman, I've been having problems with the right side drive sprocket, it would always tighten up more than the left one and the two halves come apart after driving a little. I'm using the screws that came with the HL though they may not be the right ones for the sprockets. The sprockets, tracks and idler wheels are from Mato, if that helps.
Video showing the problem:
https://youtu.be/RtfJ9psVMrQ
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Postby c.rainford73 » Sun Feb 24, 2019 2:54 am

It looks like the screw has backed out or isn't in all the way.....

If the other side doesn't come loose that only makes sense. The kit didn't come with washers?

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Postby AshMann » Sun Feb 24, 2019 2:56 am

c.rainford73 wrote:It looks like the screw has backed out or isn't in all the way.....

If the other side doesn't come loose that only makes sense. The kit didn't come with washers?

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I think it came with the washers, two small ring looking things and two screws, I'd have to check when i get home
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Postby Wardog » Sun Feb 24, 2019 3:05 am

Hi,washers yes Little black ones.

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Postby AshMann » Sun Feb 24, 2019 3:13 am

I'll reinstall the screws with the washers when i get home, and I'll post if it works out
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Postby Son of a gun-ner » Sun Feb 24, 2019 3:16 am

Don't those sprockets have two little pegs sticking out of one half, and two corresponding indents/holes in the other half where the two halves go together :think:

Could it be possible they were not lined up when you put the sprockets on?

Or, the screw on that side isn't going all the way in for some reason, maybe swap the two screws around.
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Postby AshMann » Sun Feb 24, 2019 3:25 am

Son of a gun-ner wrote:Don't those sprockets have two little pegs sticking out of one half, and two corresponding indents/holes in the other half where the two halves go together :think:

Could it be possible they were not lined up when you put the sprockets on?

Or, the screw on that side isn't going all the way in for some reason, maybe swap the two screws around.

I believe it does have the pegs and the indents, i lined up the idents before i put them on the tank, I'm not sure if they are supposed to stay together via friction as they won't stay together unless attached onto the motor axle
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Postby c.rainford73 » Sun Feb 24, 2019 3:26 am

Son of a gun-ner wrote:Don't those sprockets have two little pegs sticking out of one half, and two corresponding indents/holes in the other half where the two halves go together :think:

Could it be possible they were not lined up when you put the sprockets on?

Or, the screw on that side isn't going all the way in for some reason, maybe swap the two screws around.
Exactly my thought.

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Postby Wardog » Sun Feb 24, 2019 3:28 am

Correspond yes! Maybe a defect in the mold.

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Postby AshMann » Sun Feb 24, 2019 3:33 am

Wardog wrote:Correspond yes! Maybe a defect in the mold.

Possibly, is there a way i could still make the sprocket work? Or should i just get a new one?
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Postby Son of a gun-ner » Sun Feb 24, 2019 3:49 am

I'm trying to think if one peg is bigger than the other.

I would take the offending sprocket off, check if the two halves go together properly, and check that the screw goes in far enough without the sprocket on. If the screw doesn't go in enough for the different make of sprocket, get a couple more of the correct size washers and use more than one on that screw.

It is possible that the hole in that gearbox shaft is not as deep as the other side, maybe deep enough for a Heng Long sprocket but not a mato.
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Postby Son of a gun-ner » Sun Feb 24, 2019 3:52 am

c.rainford73 wrote:Exactly my thought.

So many things it could be, hard to know without being hands on.
Like, is the thread damaged that side.
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Postby Wardog » Sun Feb 24, 2019 3:57 am

AshMann wrote:
Wardog wrote:Correspond yes! Maybe a defect in the mold.

Possibly, is there a way i could still make the sprocket work? Or should i just get a new one?

If it is a problem with the mold maybe a little clean up,where the two halfs meet,a little play that's ok.
When you tighten the screws hold the motors gearing.so it does not move.

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Postby AshMann » Sun Feb 24, 2019 3:58 am

Wardog wrote:
AshMann wrote:
Wardog wrote:Correspond yes! Maybe a defect in the mold.

Possibly, is there a way i could still make the sprocket work? Or should i just get a new one?

If it is a problem with the mold maybe a little clean up,where the two halfs meet,a little play that's ok.
When you tighten the screws hold the motors gearing.so it does not move.

Gearing? Is that the shaft looking thing or are you refering to the gears inside?
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Postby AshMann » Sun Feb 24, 2019 4:18 am

Son of a gun-ner wrote:I'm trying to think if one peg is bigger than the other.

I would take the offending sprocket off, check if the two halves go together properly, and check that the screw goes in far enough without the sprocket on. If the screw doesn't go in enough for the different make of sprocket, get a couple more of the correct size washers and use more than one on that screw.

It is possible that the hole in that gearbox shaft is not as deep as the other side, maybe deep enough for a Heng Long sprocket but not a mato.

Are the halves supposed to stay together with friction or something? They just fall apart if they dont have a screw in them
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Postby Wardog » Sun Feb 24, 2019 4:21 am

The gears in side,but I have a henglong Sherman on the kitchen table just taken the sprocket of.and found it has been rubbing on the tanks body,the little bolt heads are cutting in.maybe a little bit of the body will fix it.

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Postby Wardog » Sun Feb 24, 2019 4:25 am

Wardog wrote:The gears in side,but I have a henglong Sherman on the kitchen table just taken the sprocket of.and found it has been rubbing on the tanks body,the little bolt heads are cutting in.maybe a little bit of the body will fix it.

This may be the answer

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Postby AshMann » Sun Feb 24, 2019 4:30 am

I've noticed that with mine, though i couldn't space the sprocket quite the same way as i could with the left side one, I'll try again though
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Postby cannedheat » Sun Feb 24, 2019 10:31 am

swop sprockets round ?
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Postby AshMann » Sun Feb 24, 2019 5:02 pm

cannedheat wrote:swop sprockets round ?

I swapped the screws around, didnt try swapping the sprockets
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