Dismantling The Piston Unit; Reassembling The Head - Seals - Piston Unit - Interpump Group 70 VHT 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. 21, 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. H.P. seal ring
2. Intermediate ring
3. L.P. seal ring
4. Bottom ring
5. 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 piston fixing screws as indicated in Fig. 23.
B) Check and verify their conditions, replace if necessary.
At every disassembly, all O-rings on the piston
unit must be replaced.
Fig. 21
2.2.5

Reassembling the head - seals - piston unit

To reassemble the various components, perform the
operations in reverse order to the list in par. 2.2.3, taking
particular care with the following:
A) Seals pack: respect the same order used during
disassembly operations.
B) Lubricate components 1and 3 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 4.
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.
Fig. 22
20
Fig. 23