I'm on my 2nd XP 550 Husqvarna, the one 10 years ago never pump all that much oil, and when it went to crap in late 2018, then I bought another XP550 in few months later and this one never seems to pump much oil either, I like a saw that uses tank for tank. So about 6 months ago I decided to find out why, I took it all apart, a bit different then your Stihl except for that small shaft you took out near end of video. I studied that pump for an hour trying to figure out how that small shaft pumps oil by just spinning, it's like you said theres a ramp on that small shaft that rides against the adjustment screw, but on my XP the ramp was so slight it was very hard to see... But not now, I VERY carefully put more of a ramp on that shaft with bench grinder, I first tried file but as I thought it's harden steel. So I put saw back together and now with oil adjustment screw on low I get all kinds oil on bar and now is tank for tank........... This XP550 is a $600.00 pro saw and there is absolutely no excuse for Husqvarna to make such junk, this one and the one before are the hardest starting saws on earth. I thought they improved after 2013 but guess not...........
The pump I replaced on the video worked fine for a couple minutes then failed. It appeared to seize like the first one. I've replaced it again, but this time I cleaned out the tank and line. I'm thinking a piece of something got into the line and jammed the small clearances in the pump.
I'm on my 2nd XP 550 Husqvarna, the one 10 years ago never pump all that much oil, and when it went to crap in late 2018, then I bought another XP550 in few months later and this one never seems to pump much oil either, I like a saw that uses tank for tank.
So about 6 months ago I decided to find out why, I took it all apart, a bit different then your Stihl except for that small shaft you took out near end of video. I studied that pump for an hour trying to figure out how that small shaft pumps oil by just spinning, it's like you said theres a ramp on that small shaft that rides against the adjustment screw, but on my XP the ramp was so slight it was very hard to see...
But not now, I VERY carefully put more of a ramp on that shaft with bench grinder, I first tried file but as I thought it's harden steel. So I put saw back together and now with oil adjustment screw on low I get all kinds oil on bar and now is tank for tank...........
This XP550 is a $600.00 pro saw and there is absolutely no excuse for Husqvarna to make such junk, this one and the one before are the hardest starting saws on earth. I thought they improved after 2013 but guess not...........
The pump I replaced on the video worked fine for a couple minutes then failed. It appeared to seize like the first one. I've replaced it again, but this time I cleaned out the tank and line. I'm thinking a piece of something got into the line and jammed the small clearances in the pump.
by removing 2 or 3 more screws you could have removed the oil pump cover and had a lot more room to work plus a better camera view
I realized that afterward. Will know better next time!