... .2 .To reduce drilling workers' labour intensity and make the operation easy on site, liners are designed to be fitted into the ... is mounted on the frame for disassembling and changing liners.4 .Suction inlets of F-1300 and F-1600 mud pumps are fitted ... pump are interchangeable.7.Cylinders, liners, pistons, valve and seats, valve springs, seal rings, valve covers and cylinder covers at the fluid end ...