Pratissoli HF Serie Manual De Reparación página 16

- Push the piston guides forward with their con-rods to
facilitate side extraction of the pump shaft. There are
two reference points visible on the shaft (indicated with 1
in Fig. 4 and in Fig. 4/a). These must be turned toward the
operator to facilitate extraction.
- Remove the pump shaft
- Complete disassembly of the con-rod units by removing
them from the pump casing and removing the piston
guide pins.
- Remove the pump shaft seal rings using common tools.
- Remove the piston guide seal rings as described below:
Use the extractor code 26019400 (Fig. 5, pos. ) and the pliers
code 27503900 (Fig. 5, pos. ). Insert the gripper as far as
possible onto the seal ring with the aid of a hammer (Fig. 5/a),
subsequently screwing the extractor to the gripper, and use
the extractor hammer (Fig. 5/b) until the ring to be replaced is
removed (Fig. 5/c).
Fig. 4
Fig. 4/a
When disassembling the con-rod groups check the wear
status of the piston guide rods (pos. , Fig. 5/d), if necessary
replace them removing the 2 fixing M6 screws (pos. ,
Fig. 5/d).
Fig. 5
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Fig. 5/a
Fig. 5/b
Fig. 5/c