I can find the place in the owner’s manual for the Coolmate 3x where it calls for oiling the bearings. (page 5, step 7, bottom left pictogram).
I’m not finding it in the Coolmate 4’s manual, but I know the old motor had oil cups on the bearings…
BTW, the Coolmate 3x on the Syncrowave 250 assembly is shown in the owner’s manual, and should be helfpul in disassembly, if needed. I think one would want to do some test welding first, to see if the fan is spinning and/or coolant is pumping before breaking it out. That was the case with the 351/Coolmate 4; it would work for a few minutes, and then the motor would freeze up (hence, no coolant flow, no cooling, no fan spinning). I keep thinking I’ll investigate, but have trouble freeing up the time (or someone’s using the other welders)…