General Pump KFM Repair Manual - Manual (Page 12)

GENERAL PUMP
A member of the Interpump Group
KFM SERIES
Page 12
2.2.4 Plunger Unit Disassembly
The plunger unit does not require periodical maintenance. Service interventions are limited to visual
inspections only. For plunger unit extraction, operate as follows:
A) Pull out the spacer and loosen the M7 x 1 plunger fastening screws as shown in fig. 20.
B) Check and verify their state of wear, and replace them if necessary. Check and verify the state of wear of the
spacers located behind the plunger (fig. 20, pos. 1), and replace them if necessary.
At each disassembly, all plunger unit O-rings MUST be replaced.
2.2.5 Head assembly - seals - plunger unit
Reassemble the various components by inverting the operations previously listed in paragraph 2.2.3, paying careful
attention to the following:
A) Seal packing: respect the same order followed during disassembly.
B) Lubricate components 2, 3 and 6 with silicone grease type (#F12001600); this operation is also considered
necessary in order to facilitate the setting of the seal lip pn the plunger.
C) For correctly assembling the HP seals in their related seats on the head without damaging the lips, use the
correct tools depending on the plumbing assembly diameters as indicated in Chapter 4.
D) Reassemble the plungers by fastening the screws with a torque wrench, respecting the fastening torque
value inicated in Chapter 3.
E) Assemble the head: for fastening torque values and fastening sequences, follow the instructions in Chapter 3.