g.Assemble the insert (8), washer (7) to valve (9) and install screw (6). Install valve assembly (5) in fluid cylinder.h.Install spring (4), gasket (3) and cover (2). Install nuts (1) and tighten alternately. Torque to 150 ft.-lb.4-5.1.2 Replacing Pistons and Liners.a.Remove nuts (11), then remove pump head (12) and gaskets (13). Remove clamp (28).b.Remove capscrews (14), lockwashers (15), plate (16) and gasket (18), to gain access to piston rod locknut (19).Loosen locknut.c.Unscrew piston rod (20) from crosshead (78), remove locknut (19) from rod, and remove rod (20) with pistonassembly (22). As this assembly is withdrawn, remove baffle (21).d.To disassemble piston (22) from rod (20), remove nut (23). Remove assembled piston from rod.NOTECorrection of a worn piston may only require the replacement of piston cups (26). Perform thefollowing step to replace piston cups.e.Remove lock rings (24), end plates (25), and piston cups (26) from body (27). Install new piston cups (26) andinstall end plates (25) and lock rings (24) on piston body(27).f.Examine liner (29) in the fluid cylinder. If it has been damaged by wear, it will need to be replaced.NOTEA liner puller is provided in mud pump tool set.g.Insert puller in liner such that its pulling shoulders engage the back (inboard) face of the liner (29). Slowly tightenpuller rod until the liner is free, then remove the puller with liner (29).h.Remove the rubber liner sleeves (30) and spacer (31) from pump. The rubber sleeves (30) shall be discarded.i.To replace liner (29), place new rubber sleeves (30) and the spacer (31) on the liner (29), then slip liner intoplace in the fluid cylinder.j.Unscrew nut (32) and remove packing (33). Remove nut (34), gland (35), packing (36) and washer (37).k.Using new packing (33 and 36), install washer (37), packing (36), gland (35), nut (34), packing (33) and nut (32).4-42
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