Brass gear slipage - Any solution ?

[MichaelC]

I just realized that the final drive brass gear is slipping (See pictures).When I try to turn the sprocket by hand and give it enough force, the drive gear will slip. Unfortunately I think these gears are not screw tighten like the usual Heng Long fare, but rather by forming the frame around the gear sets as I do not see any screws holding this set together. So it would appear that the arm that is holding the final drive is bend somewhat, and allowing a slight gap between the final drive gear and the gear before and the slippage when there is enough resistance.

Is there anyway of addressing this or I am pretty well SOL since the gear set frame seems to be bended ?

[blimp]

The finalgears are held by grubscrews - use Locktite on 'em !

[MichaelC]

blimp, the final gear is not slipping on the shaft, it is slipping between the final gear and the one prior. I think the teeth are not tight enough together because the frame is bended slightly ?

[ALPHA]

UHHHHHHHHHH...Michael....did you try tweeking the frame? use a Crescent wrench and clamp down on it like a vise.... then tweeeeeeeeeeeek the upside to using a small crescent wrench is it will not mark the surface like vise grips


ALPHA

[tomhugill]

Micheal, I think the issue has been raised before and the cause is the brass shaft (or
One of the others) is bending under heavy load. I think more recent versions had all steel shafts which solved the problem. Have you used these in the Maus?

[dgsselkirk]

I can see how the final drive shaft would flex enough to cause this problem. Those boxes look cut in and the drive shaft is really long before it gets to the support wall of the box from what I can see.
Now, it's just a thought but what if you put the larger gear wheel in the center of the shaft so it runs against the center of the gear set previous? I know I have some extra walterson around that might fit it. That way you are turning the final drive shaft from the center of mass of the gear box.

Also any bearings in the hull to guide the final drive shaft or is it just loosey goosey?
Just some thoughts...

[MichaelC]

I can see how the final drive shaft would flex enough to cause this problem. Those boxes look cut in and the drive shaft is really long before it gets to the support wall of the box from what I can see.
Now, it's just a thought but what if you put the larger gear wheel in the center of the shaft so it runs against the center of the gear set previous? I know I have some extra walterson around that might fit it. That way you are turning the final drive shaft from the center of mass of the gear box.

Also any bearings in the hull to guide the final drive shaft or is it just loosey goosey?
Just some thoughts...

That was the first thing I tried, but the problem is that the final gear also holds the shaft in the frame so if I move it the shaft can slide in and out of the frame....... It is loosey goosey as it is just the resin hull with a cutout.

Tom, the issue is not the shaft I don't think. it is the frame that is holding the final drive shaft that seems slightly out of place so then there is spacing between the final drive gear and the previous gear.

[stug 85]

I had the same problem it's the frame bending under load I glued a spacer under the frame so it has no where to flex and that seemed to solve it hope this helps

[MichaelC]

stug 85 thanks ! That's is actually one of the way I am thinking of fixing but if it works for you I will definitely give it a try ! I just took the shaft off and realized that you can actually bend that outside piece that holds the shaft WTF ?!?! No wonder it is warping under load. I guess the assumption is that the shaft spacer will hold it in place, but they never took in account of it bend out which then separates the gears.

[stug 85]

As long as the gearboxes are screwed down tight and the spacer fits tight and cannot move it should be ok I used pennies and epoxy a bit crude but it was cheap lol