Dismantling The Head - Seals; Dismantling The Piston Unit; Reassembling The Head - Seals - Piston Unit - IP 71VHT Serie Manual De Reparación

2.2.3 Dismantling 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 M12x150 head fixing screws as indicated in
Fig. 21.
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 (Fig. 22,
pos. …), being careful not to damage the respective
housings.
Pay attention to the order of seal pack
disassembly as indicated in Fig. 23 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 extract piston units:
A) Unscrew the M7x1 piston fixing screws as indicated in
Fig. 24.
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, paying
special attention to the following:
Fig. 22
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 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 observing, for the values of the
torques and tightening sequences, the instructions
contained in chapter 3.
20
Fig. 23
Fig. 24