6mmBR, the gears were the plastic ones in the hi/lo gearbox. I bought my x2 s/h with 2 spare sets of gears. The former owner also had trouble with breaking gears. If your mill has a similar set up I STRONGLY suggest that you upgrade to a belt drive, MUCH quieter, no pulling apart to replace gears in the middle of a job, can use the belt as a clutch and it seems to cut smoother and have more useable power at the cutter. I run a 2" face mill in aluminiumwithout too much trouble (have'nt tried a 1mm cut in steel YET). LMS state their conversion kit will fit a G0781.Pic below.Turnitupper, if you remember, which gears broke? I just bought a Grizzly G0781 which is really close to the LMS 3990 mill. I thought I might have some gears on hand in case I do the same and break them. I'm new, so I'm sure I'll do something ill considered and snap some gears.
Thanks.
6mmBR, the gears were the plastic ones in the hi/lo gearbox. I bought my x2 s/h with 2 spare sets of gears. The former owner also had trouble with breaking gears. If your mill has a similar set up I STRONGLY suggest that you upgrade to a belt drive, MUCH quieter, no pulling apart to replace gears in the middle of a job, can use the belt as a clutch and it seems to cut smoother and have more useable power at the cutter. I run a 2" face mill in aluminiumwithout too much trouble (have'nt tried a 1mm cut in steel YET). LMS state their conversion kit will fit a G0781.Pic below.
John.View attachment 111198
I just received the mill Friday. I haven't made a cut yet. I have read about the gears going south, and I'm already considering the belt kit you linked to. Thanks for the link. I was thinking I'd order metal gears to replace those plastic ones, but the belt kit actually sounds better.