Thorp Dirt Burners Losi JRX2 LRM Gears

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Nige55
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Re: Thorp Dirt Burners Losi JRX2 LRM Gears

Post by Nige55 »

BattleTrak wrote: Sun Aug 28, 2022 9:18 pm The Thorp Delrin top shaft gear also fits properly on the Losi A-3120 Hydra-Drive/Slipper shaft. Which means it will also fit the A-3007 JRX-Pro top shaft and the A&L Power Clutch shaft.

Image

I've just done this exactly after I received the topshaft and delrin gear today. However it binds when I tighten the gearbox fully. Did you need to grind any gearbox inner? I notice my Thorp gear is marginally wider than the stock gear for that topshaft.

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Re: Thorp Dirt Burners Losi JRX2 LRM Gears

Post by BattleTrak »

Nige55 wrote: Tue Nov 15, 2022 5:43 pm
BattleTrak wrote: Sun Aug 28, 2022 9:18 pm The Thorp Delrin top shaft gear also fits properly on the Losi A-3120 Hydra-Drive/Slipper shaft. Which means it will also fit the A-3007 JRX-Pro top shaft and the A&L Power Clutch shaft.

Image

I've just done this exactly after I received the topshaft and delrin gear today. However it binds when I tighten the gearbox fully. Did you need to grind any gearbox inner? I notice my Thorp gear is marginally wider than the stock gear for that topshaft.
No, I didn’t have to grind anything.

A few things to check:
- Make sure the roll pin is centered or not too long to where it is interfering with the gear mesh.
- Make sure the hole for the top shaft in the gear case is 5/16” so that it doesn’t rub the slipper plate.
- Last, be sure to install a shim on the end of the top shaft…#69 in the pic.

Image
-Brad

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Nige55
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Re: Thorp Dirt Burners Losi JRX2 LRM Gears

Post by Nige55 »

BattleTrak wrote: Wed Nov 16, 2022 6:30 am
Nige55 wrote: Tue Nov 15, 2022 5:43 pm
BattleTrak wrote: Sun Aug 28, 2022 9:18 pm The Thorp Delrin top shaft gear also fits properly on the Losi A-3120 Hydra-Drive/Slipper shaft. Which means it will also fit the A-3007 JRX-Pro top shaft and the A&L Power Clutch shaft.

Image

I've just done this exactly after I received the topshaft and delrin gear today. However it binds when I tighten the gearbox fully. Did you need to grind any gearbox inner? I notice my Thorp gear is marginally wider than the stock gear for that topshaft.
No, I didn’t have to grind anything.

A few things to check:
- Make sure the roll pin is centered or not too long to where it is interfering with the gear mesh.
- Make sure the hole for the top shaft in the gear case is 5/16” so that it doesn’t rub the slipper plate.
- Last, be sure to install a shim on the end of the top shaft…#69 in the pic.

Image
Perfect! Thank you!! I realise from your post I don't have the shim there at the end of the shaft. Thank you, I'll try adding that

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Nige55
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Re: Thorp Dirt Burners Losi JRX2 LRM Gears

Post by Nige55 »

BattleTrak wrote: Wed Nov 16, 2022 6:30 am
Nige55 wrote: Tue Nov 15, 2022 5:43 pm
BattleTrak wrote: Sun Aug 28, 2022 9:18 pm The Thorp Delrin top shaft gear also fits properly on the Losi A-3120 Hydra-Drive/Slipper shaft. Which means it will also fit the A-3007 JRX-Pro top shaft and the A&L Power Clutch shaft.

Image

I've just done this exactly after I received the topshaft and delrin gear today. However it binds when I tighten the gearbox fully. Did you need to grind any gearbox inner? I notice my Thorp gear is marginally wider than the stock gear for that topshaft.
No, I didn’t have to grind anything.

A few things to check:
- Make sure the roll pin is centered or not too long to where it is interfering with the gear mesh.
- Make sure the hole for the top shaft in the gear case is 5/16” so that it doesn’t rub the slipper plate.
- Last, be sure to install a shim on the end of the top shaft…#69 in the pic.

Image
Thanks again for the help! Weirdly it's still binding. looking at the metal stock gear on that shaft, it doesn't protrude past the pin (the pin sits in a recess for it), whereas the Thorp one does. So I may just try sanding it down on the pin side.

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