The mud pump cylinder head is perforated. Before installing the cylinder cover, apply grease to the surface of its thread buckle. Check every 4 hours for signs of looseness. If the cylinder head is loose, seal or tighten cylinder cover should be replaced in time. Do not plug the drain hole. If plug the drain hole, it will cause the cylinder cover thread and other parts to be "punctured" when the cylinder cover seal fails.1.We are in a good position not only to supply you high quality machinery, but also the excellent after sales service. And the products have a long warranty period.2.Our sales team will response for your question within 24 hours (Holidays Excluded)3.Free replacement will provide once the failure confirmed caused by our product quality.EMSCO:F-1300,F-1600,FB1300,FB1600,F-800,F-1000,F-500,F-350,DB-550,DA-700, FA-1600/1300, FC-2200, D-300/500, D-375, D-700IDECO: T-500, T-800, T-1000, T-1300, T-1600NATIONAL: 7P50, 8P80, 9P100, 10P130, 12P160, N1300, C-250, K-700, 14-P-220, E-700/G-1000, K-500, K-380, K-500A/700A, C-250/350, JWS-400GARDNER DENVER:PZ7,PZ8/9,PZ10/11,FK-FXK,FY-FXD,FD-FXX,FG-GXG, FG-FXG,KG-KXG, FQ-FXQ, FF-FXF,FF-FXPOILWELL: A-560/600-PT, A-850-PT/A-1100-PT, A-1700-PT/A-1400-PTAnd other brand spare parts for Wirth,Opi,Ellis Williams,Wilson,Gaso,Skytop/Brewster.