General Pump KFM Repair Manual - Manual (Page 10)

2.2.2 Head assembly - valve units
Pay careful attention to state of wear of the various components; replace them when necessary, and
in any case within the intervals indicated in the table in fig. 14, Chapter 11 of the Owner’s Manual.
At each inspection, replace all valve units and valve plugs, o-rings and enti-extrusion rings.
Before repositioning the valve seats and the H.P. seals, clean and perfectly dry the relevant seats in the head
as indicated in fig. 14.
GENERAL PUMP
A member of the Interpump Group
KFM SERIES
Page 10
fig. 14
Proceed with reassembly by inverting the proceedure indicated in paragraph 2.2.1.
During the assembly of the suction and delivery valve units (fig. 15 - fig. 16) do not invert the suction
springs with the previously disassembled delivery springs:
a) Suction springs “white”
b) Delivery springs “black”
To facilitate insertion of the valve guide on the seat, you can use a pad placed on the horizontal surfaces of the
guide (fig. 16) and drive it with a sliding hammer.
Mount the suction and delivery valve groups with the tool p/n F27576300 (see construction diagrams in paragraph 4.1)
making sure that they are abutting with the bottom of the seat on the head (fig. 16a). Then put on the valve covers and
proceed with calibration of the M12 x 35 screws with dynamometric key as shown in Chapter 3.