Pratissoli KF5M Serie Manual De Reparación página 19

2.1.2 Reassembly of mechanical parts
After having checked that the casing is clean, proceed with
assembly of the mechanical part as described below:
- Assemble the upper and lower half-bearings in
their seats in the con-rods and caps.
Make sure that the reference marks on the
upper half-bearings (Fig. 6, pos. ) and lower
half-bearings (Fig. 6/a, pos. ) are positioned in
their respective seats in the con-rod and cap.
If the piston guide rods have been disassembled, before
reassembling them check the correct positioning of the
sealing O-rings (pos. , Fig. 6/b) replace them if necessary.
Tighten the piston guide rods through the respective
two M6 screws to the tightening torque indicated in the table
of page 28.
1
Fig. 5/d
- Insert the piston/con-rod guide units into the pump
casing, directing the numbering on the con-rod shank
towards the top of the casing.
To facilitate pump shaft insertion (without the tab), it is
essential to repeat the operation performed during
disassembly, pushing the piston/con-rod guide units as far
down as possible (par. 2.1.1).
- Before assembling the side cover on the PTO side, check
the conditions of the radial ring lip seal and relative
contact area on the shaft.
If replacement is necessary, position the new ring using a tool
(code 27904800) as shown in Fig. 7.
If the pump shaft shows diametrical wear in
the area of contact with the lip seal, in order to
prevent the grinding operation, it is possible to
reposition the ring in abutment with the cover as
shown in Fig. 7.
Before assembling the side covers, make sure there are O-rings
on both of them and shim rings on the indicator side cover
only.
To facilitate filling of the first section and relative press
fitting of the covers on the casing, we recommend using
3 partially-threaded M6 x 40 screws (Fig. 8, pos. ), then
completing the operation with the screws supplied (M6x18).
Fig. 6
RING POSITION TO REMOVE SHAFT IF
Fig. 6/a
19
RING POSITION ON FIRST ASSEMBLY
WORN
Fig. 6/b
Fig. 7