The following basic points can be checked for troubleshooting the metering pumps:
Is there a sufficient air supply?
Is there a sufficient material supply?
Is the air regulator set at desired pressure?
To determine if there is a problem in the air control, air drive, fluid pump, or outlet hose and nozzle gun:
Disconnect outlet hose, turn air pressure down and trigger the applicator: If it cycles and pumps material, the hose or applicator is plugged. If not, remove the outlet check valve. Trigger the pump, checking for movement of pump; if no movement, check for plugged pump or air motor problem.
If the pump doesn’t run but pressure from drive cylinder can be felt, the problem is in the lower section. The fluid pump can be replaced or rebuilt with repair kit.
Problem in hose or gun. Problem is in the hose if it’s plugged or kinked and should be replaced. Problems is in the gun if it’s plugged. The gun can be disassembled and cleaned.