Interpump Group SWS71 Manual De Reparación página 22

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 the use and
maintenance manual.
A) Unscrew the M12x150 head fixing screws (M12x220 on
SWS71) 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, 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. HP seal
2. Seal support
3. LP seal
4. Seal ring
5. Circlip
6. O-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 remove the piston units.
A) Unscrew the M7x1 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:
Fig. 21
A) Seals pack: respect the same order used during
disassembly operations.
B) Lubricate components 1-3 with OCILIS silicone grease
code 12001600 on the external diameter only.
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 4.
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.
2.2.6 Wiper disassembly (SWS71)
Wiper replacement is necessary whenever leaks are detected
from the second drainage chamber present between the
spacer and the pump casing (Fig. 24). However, an indication
of estimated component replacement intervals is present in
the table in chapter 11 of the Use and maintenance manual.
22
Fig. 22
Fig. 23