PM 728VT one-shot oiler leak

[wrmiller]

I've noticed that the one-shot oiler reservoir slowly drains, leaving a puddle on the floor. The owner's manual doesn't have a parts breakdown for the pump, but there's probably a leaky check valve or similar in there.

Anyone have experience with this?

thx

K

I noticed this after a while on my 935. Thought about it for a bit and then installed a simple valve on the output of the oiler pump. Open the valve, give the oiler two or three pumps, and then close the valve. Simple, and worked very well.

 

[kmanuele]

Follow up on pump issue:

After blowing out the check valve, I re-plumbed it to raise the outlet above the reservoir level. Used the original fitting with check valve at the top so I could connect the original piping.

Should prevent draining out by gravity with an open check valve. Crossing my fingers I don't some siphoning

 

[tominboise]

I noticed this after a while on my 935. Thought about it for a bit and then installed a simple valve on the output of the oiler pump. Open the valve, give the oiler two or three pumps, and then close the valve. Simple, and worked very well.

I am going to do this to my 728. Great tip.

 

[tominboise]

Follow up on pump issue:

After blowing out the check valve, I re-plumbed it to raise the outlet above the reservoir level. Used the original fitting with check valve at the top so I could connect the original piping.

Should prevent draining out by gravity with an open check valve. Crossing my fingers I don't some siphoning

View attachment 492278

What size pipe fitting does this oiler use?

 

[dabear3428]

Follow up on pump issue:

After blowing out the check valve, I re-plumbed it to raise the outlet above the reservoir level. Used the original fitting with check valve at the top so I could connect the original piping.

Should prevent draining out by gravity with an open check valve. Crossing my fingers I don't some siphoning

View attachment 492278

that does not stop the siphon effect unless you put a vacuum break in the high spot (you do not want that), you need check valves.

 

[kmanuele]

What size pipe fitting does this oiler use?

1/8 NPT

 

[kmanuele]

that does not stop the siphon effect unless you put a vacuum break in the high spot (you do not want that), you need check valves.

Suspect you are correct, and my plumbing might be for nought. I put the check valve back in (after blowing it out and verifying it worked).

PM also sent me a new valve, so I have a spare.