General Pump HF Owner Manual - Manual (Page 17)

GENERAL PUMP
A member of the Interpump Group
HF SERIES
Page 17
Take note of the correct order of the entire package
components when disassembling (Fig. 26):
1. Head ring
2. HP packing
3. “Restop” ring
4. Middle ring
5. LP packing
6. Back packing
7. Elastic ring
8. O-ring
When reassembling, make sure of the correct order of
the components.
C) Reassembling:
In order to carry out the replacement more easily,
apply a very small quantity of silicone grease on the
pressure packing lips and their seats in the fluid end.
This operation will also help the sealing lips settle
on the plunger.
Fit the fluid end back in place and tighten the bolts
with a torque wrench set for the value
indicated in the table on page 18 and in the
sequence indicated here below.
11.2.3 Plunger
To replace the plunger, if necessary, do as follows:
A) Loosen and remove the plunger screws as
indicated in Fig. 29
When disassembling the pumping unit, the O-rings
should always be replaced.
B) Fit back the replaced components inverting the
order. Use a torque wrench set for the values
indicated in the table on page 18.