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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. 37 and Fig. 37/a), being careful not to
damage the respective housings.
Pay attention to the order of seal pack
disassembly as indicated in Fig. 38 and Fig. 38/a
composed of:
SN
SW
Fig. 37
7
6
Fig. 37/a
6
2.2.6
Disassembly of the piston unit
The piston unit does not require any routine maintenance.
Maintenance is limited to visual checks only.
To extract piston units: Loosen the M 7x1 piston fixing screws
as indicated in (Fig. 39)
27
1. Head ring
2. HP seal
3. Restop ring
4. Seal support
5. LP seal
6. Seal ring
7. O-ring
1. Spacer (SW64)
2. HP seal
3. Seal support
4. LP seal
5. Seal ring
6. O-ring
5
4
3
2
5
4
3
2
1
Fig. 38
1
Fig. 38/a
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