muddymac7

Many thanks for that. I have to say the pump is an incredibly simple design and finding nothing wrong was actually a blow! I'm more used to rebuilding classic and vintage cars so to be thwarted by this was a bit frustrating. Will try thinner oil. The saw is actually so good that it is worth persevering. Still not as good as my old Pioneer P20 but I try not to use that as it is pre-chainbrake.

Just inherited an immaculate ProMac 10-46 with an 18" bar. Fresh petrol, sharpened chain, Oregon chain oil. Started instantly, cut very well but then after a few 10" logs I discovered chain was getting hot. No chain oiling. Adjuster underneath already set to max. Stripped side off and clutch expecting to find perhaps nylon gear had stripped teeth. Both gears fine. Everything in the pump was perfect, not choked with sawdust and the feed and output pipes were clear, Filter clear. When I rotated driven gear gently by hand it pumped up the drops of engine oil that I had used to assemble pump for first start. Put back together. Ran. Nothing . Not one drop of chain oil coming up the pipe from the pump. ??????????????????? Help please. Do I try EP90 gear oil instead or Oregon chain oil - but really the pump and saw are barely run-in.