General Pump SK Repair Manual - Manual (Page 33)

GENERAL PUMP
A member of the Interpump Group
SK SERIES
Page 33
At each inspection of the valves, replace the seal rings and the frontal seal O-rings between
liner and head, and between head and liner spacer in the recirculation hole area. Before
reassembly clean and dry the various components and all their seats inside the head.
Take out the valve seats and check the state of wear of the gaskets. If necessary, replace them (1, fig. 116).
If the valve seats are stuck on the head due to the formation of limescale or oxide, they must
be freed by inserting the special tool (part #034300020 for SK20, SK22, SK24 or #034300010
for SK26, SK28, SK30 into the outlet hole (1, fig. 115).