ENGLISH
71
6
SPECIAL VERSIONS
The instructions for repairing special versions are given below.
Unless specified otherwise, refer to the information above for
the standard MK-MKS pump.
- MKC - MKSC pumps: for repair, follow the instructions for
the standard MK-MKS pump.
- MKR - MKSR pumps: for repair, follow the instructions for
the standard MK pump with the exception of the pressure
seals, for which it is necessary to follow the paragraphs
below.
6.1
DISASSEMBLY OF THE PISTON UNIT –
SUPPORTS – SEALS
The piston unit requires preventive checks as indicated in the
preventive maintenance table in the
Use and maintenance
manual
.
Maintenance is limited to visual inspection of any drainage
from the hole present on the lower cover. If abnormalities /
variations on the outlet pressure gauge or dripping from the
drainage hole circuit are detected, the seal pack will have to
be checked and replaced.
Proceed as follows to remove the piston units:
To access the piston unit, unscrew the M16x180 screws and
remove the head.
Remove the head taking care to avoid hitting the
pistons.
Disassemble pistons unscrewing the fixing screws (pos.
,
Fig. 151).
Remove the piston from the seal support and check that
its surfaces do not present any scratches, signs of wear or
cavitation.
Fig. 151
Remove the upper inspection cover, unscrewing the 4 fixing
screws (pos.
, Fig. 152).
Fig. 152
Manually turn the shaft in such a way to bring the 3 pistons
progressively to the top dead centre position and insert the
buffer tool code 27516600 between the piston guide and the
piston (pos.
, Fig. 153).
Fig. 153
Turning the shaft, have the piston guide move forward so
that the buffer, moving ahead, can expel the seal support, the
spring and the entire piston unit (pos.
, Fig. 154).
Fig. 154
Extract the seal support unit and the buffering tool.
Remove the seal support bottom O-ring should it remain
inside the pump casing (pos.
, Fig. 155).
Fig. 155