The following check list may aid you in keeping your pumps in top condition.
Check the following points on a monthly basis
Priming speed
Capacity
Noise in pump casing
Gaskets and O-rings
Shaft seal leakage of air and water
Hose, hose washers and suction strainer
Crankcase oil level (engine)
Spark plug condition (engine)
Air cleaner (engine)
Unusual engiene noise
Proper RPM (engine)
Carburetor adjustment (engine)
Check the following points every 6 months
1.Impeller wear
2.learance between impeller face and the volute (refer to manufacturer's recommendations)
3.Shaft seal wear
4.Shaft sleeve wear
5.Clean the casing and volute passages