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Old 19-04-2013
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Origineelreclamebord Origineelreclamebord is offline
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Default DEX210: New Gearbox, tight after assembly?

Hi everyone,

I have a brand new DEX210 gearbox here (note: this is a gearbox from the very first batch of DEX210s) and I'm having a small issue with it. In RM3 setup the gearbox doesn't run freely after I have tightened the motor plate on there. Without the motor plate it is free.

I don't tighten it like I'm the Hulk, actually it's tightened in a very subtle manner. The gearbox was shimmed as per suggestion by the manual. The diff gear does seem free as it can still slightly move from left to right.

I tried removing a 0.5mm idler gear shim: it doesn't help. It means there is something going on with the slipper shaft/mainshaft. I've just tightened the lot minus the bearing that goes in the add-on gearbox piece between the motor plate and housing and it moves freely. So... it seems the layshaft spacer might be slightly too long?

Has anyone come across the same problem? And what should I do? Shim the add-on gearbox piece until there is no more excessive friction, vile some material off the spacer, get a replacement/uprated spacer and/or contact Durango about the issue?
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Old 19-04-2013
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Lee24h Lee24h is offline
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It sounds like the gears maybe binding
Is it all freshly greased if so run it to see if its binding after if it is the it maybe durangos error as the shiming on the manual is correct
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Old 19-04-2013
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What diff are you running?
Ball diff = shims
Gear diff= no shims

Put a 0.5-1mm (whatever you have) shim between the motor plate and the gear box then you can tighten the screws like the hulk
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Old 20-04-2013
mihael mihael is offline
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hi there

i knwo this problem with strong running gears.
i have tried 5 gear box cases. two of them allowed to run my gear free. 3 of them i throw away, because the gear runs to tight in it.

i never had this kind of troubles with asso b4
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Old 20-04-2013
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danharding danharding is offline
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Also worth checking the screws are not bottoming out on the inside slipper plate. 1 extra washer normally cures this.
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Old 20-04-2013
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What Dan said! I rebuilt mine the other day and because the long gearbox housing screws were too tight the spur wouldn't move freely, back them off a little
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Old 21-04-2013
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Thanks for the replies guys At a certain moment I also tried it without the slipper on (just the shaft in there) - still the same problem - and I didn't see the screws protrude beyond the motor plate. I think if I'd put just the layshaft in there it turns out that is the part that runs tight. I'll try to find some time to look into that tomorrow, I'll keep you updated
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Old 22-04-2013
Fabs Fabs is offline
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Hi mate,

I've had the same issue with my kit. The problem was from the Layshaft Spacer (TD310243) which was a tad too long and was crushing the bearings (the small one was destroyed after 1 meeting). I ended up sanding it down step by step until I could tighten the motor plate without the gearbox binding AND with a little bit of axial play (1/10th to 2/10th, this will have no adverse effect to the running of the gearbox, but do not take out too much) to take into account eventual expansion when the parts get hot.

Fabs
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  #9  
Old 22-04-2013
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Take the box apart again and measure the layshaft spacer with a vernier and i will do the same with one of the uprated units Durango sell later (im rebuilding my gearbox tonight so can measure it for you).

This would sound like the spacer, but also check that the small bearing is seating home correct that is on the other end of the layshaft
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