Disassembly Of The Piston Unit; Reassembly Of The Head - Seals - Piston Unit - Interpump Group KT-WK Serie Manual De Reparación

C) Extract the high pressure seals from the head and the low
pressure ones from the support, using simple tools as
indicated in Fig. 30, pos.  being careful not to damage
the respective housings.
Pay attention to the order of seal pack
disassembly as indicated in Fig. 31 for KT 20‑
KT22 version pumps and in Fig. 31/a for KT19
version pumps, composed of:
1. Head ring
2. HP seal
3. Restop ring
4. Seal support
5. LP seal
6. Seal ring
7. 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 extract piston units: loosen the M7x1
piston fixing screws as indicated in Fig. 32:
Check and verify their conditions, replace if necessary.
At every disassembly, all O‑rings on the piston
unit must be replaced.
Fig. 30
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
disassembly operations.
B) Lubricate ƒ components 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 4.
E) Replace the head as follows:
1. Position the seal supports in the respective seats on
the casing;
2. Using two screws – service pins (code 27726000),
fasten the casing as indicated in Fig. 33. Position the
complete head, making sure that it is centred only on
the central piston.
3. Complete the operations, following the tightening
Fig. 31 procedure. For the torque values and tightening
sequences follow the instructions in chapter 3.
Fig. 31/a
23
Fig. 32
Fig. 33