A shear SHAFT?
Actually, no. Fixed it by adding hydraulic fluid to the reservoir No sight glass or dip stick just a 1.5 inch pipe cap in the top to look down into. Little leaks over time build up.Blew out the piston seals?
Interesting. I had a Milwaukee M18 angle grinder and it was absolutely horrible. No power. Start grinding or cutting, and within 30 seconds it would cut off. I could reset it quickly, but eventually I just smoked it... it must have been overheating causing it to shut off.I have lots of Milwaukee tools, all except my angle grinder have been great. But the chain saw and weed whip us M18 RedLithium HD12.0 batteries all of which have failed after little usage. There is a YT video on how to replace s single cell but its not easy. Instead I have been buying 4 packs of "after market" HD8.0s for less than the price of one HD12.0 from Milwaukee and had outstanding life.