Repairing Hydraulic Parts; Dismantling The Head-Valve Units - Pratissoli KF Serie Manual De Reparación

Proceed to determine the shim pack, using the table below:
Detected Measurement
From: 0.05 to: 0.10
From: 0.11 to: 0.20
From: 0.21 to: 0.30
From: 0.31 to: 0.35
From: 0.36 to: 0.45
From: 0.46 to: 0.55
From: 0.56 to: 0.60
From: 0.61 to: 0.70
Once the type and number of shims have been determined
using the table, check the following: assemble the shim pack
on the indicator side cover centring (Fig. 15), secure the cover
to the casing, following the procedure in par. 2.1.2, and tighten
the screws to their recommended torque.
Check that the shaft rotation stall torque is between 4 Nm and
6 Nm.
If this torque is correct, connect the con-rods to the bend
shaft and to the next stages. If it is not, redefine the shim pack,
repeating the operations.
2.2

REPAIRING HYDRAULIC PARTS

2.2.1

Dismantling the head-valve units

Operations are limited to inspection or replacement of valves,
if necessary.
Proceed as follows to remove the valve units:
Shim Type # pieces
/ /
0.1 1
0.1 2
0.25 1
0.35 1
0.35 1
0.10 1
0.25 2
0.35 1
0.25 1
Fig. 15
Fig. 16
20
- Unscrew the 7 M12x35 valve cover fixing screws and
remove the covers (Fig. 16).
Remove the valve plugs by means of an extractor hammer
(code 26019400 combined with the tool code 27513600,
Fig. 16).
- Extract the valve units using the same extractor hammer
used for the valve plugs (code 26019400 combined with
the tool code 27513600, Fig. 16/a).
If the suction and outlet valve seats remain
stuck on the head (for example because of
incrustations due to prolonged lack of use of the
pump), proceed as follows:
- use the extractor tool (code 27516900 combined
with the tool code 26019400, Fig. 16/b).
- Disassemble the suction and outlet valve units, screwing a
sufficiently long M10 screw in such a way as to be able to
reach the valve plate and extract the valve guide from the
valve seat (pos. „, Fig. 17).
Fig. 16/a
code 26019400
code 27516900
Fig. 16/b
Fig. 17