Dismantling The Piston Unit; Reassembling The Head - Seals - Piston Unit - Interpump Group Pratissoli WK Serie Manuel De Réparation

C) Extract the high pressure seals from the head and the low
pressure ones from the support, using simple tools as
indicated in (Fig. 21, pos. …), being careful not to damage
the respective housings.
Pay attention to the order of seal pack
disassembly as indicated in Fig. 22 composed of:
1. Head ring
2. HP seal
3. Restop ring
4. Seal support
5. LP seal
6. Seal ring
7. Circlip
8. O-ring
2.2.4

Dismantling the piston unit

The piston unit does not require any routine maintenance.
Maintenance is limited to visual checks only.
Proceed as follows to remove the piston units:
A) Loosen the M 7x1 piston fixing screws as indicated in
Fig. 23.
Fig. 21
B) Check and verify their conditions, replace if necessary.
At every disassembly, all O-rings on the piston
unit must be replaced.
2.2.5 Reassembling the head – seals – piston unit
To reassemble the various components, perform the
operations listed above in reverse order to par. 2.2.3, taking
particular care with the following:
A) Seals pack: respect the same order used during
disassembly operations.
B) Lubricate components 2, 3 and 5 with OCILIS silicone
grease code 12001600. This operation is also deemed
necessary to facilitate adjustment of the lip seal on the
piston.
C) For correct assembly of HP seals in their seats on the head
without causing any damage to lip seals, use suitable
tools according to the pump diameters as indicated in
chapter 5.
D) Remount the pistons, tightening the screws with a
torque wrench, respecting the tightening torque value as
indicated in chapter 3.
E) Assembling the head: for the values of the torques and
tightening sequences follow the instructions contained in
chapter 3.
Fig. 22
22
Fig. 23