Chainsaw Repair

The duckbill valve in the check valve PN 530069142 often go bad. The valve assemblies are getting hard to find. They work by taking the positive pulse (piston down stroke) from the crankcase and feeding that to a port on the oil tank causing it to pressurize the tank. If the duckbill valve is shot, the negative pulse from the crankcase allows the pressure to be drawn back. So, no pressure to the oil tank.

There are some check valves on e-bay now.

If you care to rebuild the valve yourself I did this little write up.