Hey guys, I've got a bar oiling problem with a friends saw that I can't seem to identify the source of. It's a Husqvarna 340. He brought it to me to check out and get running. The piston looked good and the intake appeared to be tight so I put some fuel in it and the saw fired right up but wasn't oiling the bar. I found that the 540057901 Piston Pump gear was stripped so I replaced it and 503931801 PINION that drives it. I did not replace the 537154801 hard plastic tube the piston pump rides in or the 503854801 rubber part that the plastic tube inserts into.
I'm not getting a bunch of oil being pumped that isn't getting to the bar, it's like it's sucking air instead of bar oil. I emptied the oil tank, sloshed a little fuel in there and blew air through the oil outlet at the pump back into the tank with the cap off to try to clear any crud that might be keeping oil from getting to the pump. I dropped the little basket filter on the bottom of the saw and everything looked clean there. The 503854801 rubber part looks okay to me, but I'm wondering if that may be the problem. It's a crazy simple system with a minimal amount of moving parts; it baffles me that I can't figure out what's wrong. The pinion appears to drive the piston pump properly, and the piston pump turns freely in the plastic tube. The plastic tube has opposing holes, and those are lined up with the related holes in the rubber seal. I can't see any reason it shouldn't work, but it doesn't. Anyone seen anything like this before?
Dave