Originally Posted by
popspipes
I put one on my machine at the top of the Z because it was easy acess to the main oil line, a few years back and havent had any problems with it siphoning back since. Once the air is out of the line it should not siphon back down, it hasnt in my case.
The check valve was a 5mm push on that I purchased from Ebay
My machine sat unused for a week sometimes and the oil would siphon down and it would take about 4 pumps to get oil back on the Z ways with the manual oiler.
I have a problem now with one of the X ways closest to the operator that isnt oiling correctly, I oil that one manually.