General Pump HF Owner Manual - Manual (Page 16)

GENERAL PUMP
A member of the Interpump Group
HF SERIES
Page 16
Valve components of each valve are pressed together
and therefore they can be easily replaced and installed
back in place by means of simple tools (see Fig. 22).
Check the components for wear and replace if necessary.
Replace all o-rings of the valve units and valve plugs,
at each inspection.
IMPORTANT NOTE:
BEFORE REPOSITIONING THE VALVE
UNITS AND O-RINGS, CLEAN AND
PERFECTLY DRY ALL VALVE HOUSINGS
INSIDE THE FLUID END
(see arrows Fig. 23).
D) To reassemble the valves proceed the other way
around and tighten the cover screws with a
torque wrench. Table on page 18
contains the screw tightening torque
values and Fig. 28 (page 17) indicates
the sequence.
11.2.2 Seals
The replacement of the seals is necessary when water
drips throught the holes provided underneath the
crankcase. For replacement, do as follows:
A) Remove the fluid end by loosening the 8 bolts
(see Fig. 24).
B) Remove the high pressure packings from the fluid
end and the low pressure ones from their support
by means of standard tools, taking great care not to
damage the seats. See Fig. 25.