General Pump HF Owner Manual - Manual (Page 15)

GENERAL PUMP
A member of the Interpump Group
HF SERIES
Page 15
11.2 Fluid end maintenance
11.2.1 Pump head
The pump head does not require periodic maintenance.
Service operations are limited to the component
inspections and/or replacement, when necessary.
Valve units:
The valve units are contained in the head and mounted
in a vertical position. For proper inspection they should
be taken out. Proceed as follows:
A) Loosen the valve cover screws (not shown).
B) Extract the valve plugs with an extractor or a M8
threaded rod (see Fig. 19).
C) Extract the valve unit with the same tool.
D) Extract the valve spacer using an extractor or a
M16 threaded rod (see Fig. 20).
E) Extract the suction valve unit by using an
extractor or a M8 threaded rod (see Fig. 21).