Check air supply, suction leaks, fluid level, strainers, check valves and downstream restrictions. DP-K25 lists 25 L/min maximum delivery, 200 L/min air consumption and a 2 mm maximum grain diameter, but actual performance depends on the application. A larger compressor alone may not correct a blocked fluid path. Isolate supplies and relieve pressure before inspection; use model-matched diaphragms and valve parts.