Pro Mac 10-10 oil pump

[farmer11]

I have a pro mac 10-10 and the oil pump has decided to stop working. How does this pump work. I took it apart but couldn't decide what made it pump.
Could't see that anything was broken. Thanks for the help

 

[Lawn Masters]

its a diaphraghm pump, it could have a blockage somewhere that you cant see. also, when was the last time the bar groove was cleaned out? sometimes its the simple stuff that makes a problem seem complex.

 

[HiOctane]

The round fiber disc is used as the "piston" to pump oil.Sometimes it became worn,change the small o ring under the fiber , be sure its tight to avoid leak.Also tighten the 3 bolts that holds the pump tight.Blow air in the oil passage also.
If you want to know if she pumps before intalling it,just squirt a bit of oil in one of the 2 holes on the top of the pump,and push the "piston" few times to see if oil comes out from the other small hole.

 

[ozflea]

Yes HiOctane is right, if the oil discharge hole in the bar was blocked you can sometimes clear it by just pumping the manaul over ride.

Mc Bob.