Interpump Group SS70 Manual De Reparación página 21

2.2.3 Disassembly of the head – seals
Replacement of the seals is necessary from the moment you
begin to detect water leaks from the drainage holes provided
on the back of the pump casing, and at the intervals indicated
in the "PREVENTIVE MAINTENANCE" table in chapter 11 of the
use and maintenance manual.
A) Unscrew the M10x110 head fixing screws as indicated in
Fig. 20.
B) Separate the head from the pump casing.
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, being careful not to damage the
respective housings.
Pay attention to the order of seal pack
disassembly as indicated in Fig. 21 composed of:
1. Bottom ring
2. O-ring
3. L.P. seal ring
4. Intermediate ring
5. H.P. seal ring
2.2.4 Disassembly of the piston unit
The piston unit does not require any routine maintenance.
Maintenance is limited to visual checks only.
Proceed as follows to extract piston units:
A) Unscrew the piston fixing screws as indicated in Fig. 23.
Fig. 20
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 Reassembly of 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
Fig. 21
disassembly operations.
B) Lubricate  components with OCILIS 250 silicone
grease code 12001600 on the external diameter only.
C) For correct assembly of HP seals in their housing on the
head using the specific tools as indicated in chapter 5.
D) Remount the piston, tightening the screws with a torque
wrench, respecting the tightening torque value.
E) Assembling the head: for the values of the torques and
tightening sequences follow the instructions contained in
chapter 3.
21
Fig. 22
Fig. 23