Repairing gearbox on a rc4wd 4200xl excavator

[johnny88]

The following links are to a Youtube video I posted on the problems and solutions concerning the gearmotor on the 4200XL
https://www.youtube.com/watch?v=us55rdrZBNU

This video shows how to modify the gearbox output shaft. (at about the 15 second mark I show a drawing – in it I mislabeled the thickness of the spacer – it should be 5.2mm – not 4.9mm)
https://www.youtube.com/watch?v=QrCYWV-F2gI

If my drawings are blurry in the youtube video, you need to change the quality setting by selecting the 'gear' (settings)in the lower right side of the screen, then select 'quality', and finally select 720. (480 could suffice)

This is a link to where to buy gearmotors that will provide you the parts you need. (but no spacer)
https://www.aliexpress.com/item/3258...27424c4dUsWm4N


Digging a pathway to lay down a brick pathway, I have dug out 2,755 pound of dirt which equals 1.74 cubic yards. To move the dirt I used the Armageddon 8x8 dumptruck that RC4WD sells. (on average a load was 15.5 pounds, and a minimum of .265 cubic feet - hauled 177.75 loads to dig out the path way)

[johnny88]

[johnny88]

[johnny88]

[frizzen]

That's a heck of an introduction!

This is probably going to need to be a sticky in the tech forums