General Pump MS Owner Manual - Manual (Page 11)

GENERAL PUMP
A member of the Interpump Group
MS SERIES
Page 11
Check the valve components for wear and replace where
necessary. Every time valves are inspected, all
o-rings and valve covers should be replaced.
Reassemble the valve units and fit them
back in the fluid end. Valve cover screws
should be tightened with a torque wrench
set for 86.7 ft. lbs.
Should excessive scaling inside the fluid end hinder the
valve extraction open one of the two lateral inlet ports,
remove the three plugs, Fig. 15, insert our special tool
p/n F200000050 (or a corresponding one) and push the
valve unit out as shown in Fig. 15.