26
27
Change of the worn piston
Make sure that the piston is
stopped in the front part of the
cylinder, close to the valve’s
group.
• Disassemble the suction and
delivery valve’s group remo-
ving the screw (67) that fixes
it to the hopper, the 3 screws
(74) that connect it to the cylin-
der and the hose clamp (70)
that fixes the rubber coupling
to the suction group.
• In order to change the worn rubber
piston, remove the nuts (75), move
back the driving shaft using the
compressor pulley.
In order to remove the piston, screw
in it a threaded bar, and then pull it.
• Put the piston back, take care of putting the shaft in the
correct position and fix it with the nuts (75).
• Once the piston has been changed, re-mount all the
parts following the procedure above described.
67
74
75
70
Changing of the damaged valve’s seats
In order to change the worn valve’s seats proceed
following the instructions given below:
Delivery valve’s seat
• Remove the screw (67) that
fixes the delivery valve’s group
on to the hopper and the 4
screws (68) that are blocking it
on to the suction valve group.
• Remove the worn delivery val-
ve’s seat (69) and change it with
a new one.
• Mount back the valve’s group
fixing it with the given screws.
Suction valve’s seat
• Remove the hose clamp (70)
that fixes the rubber coupling
to the suction collector flange
and then remove the two
screws (71) that on the other
side are fixing the suction
collector flange to the suction
valve casting.
• Remove the worn delivery
valve’s seat (72) and change
it.
• Re-mount
the
suction
flange.
67
68
69
70
71
72
Summary of Contents for UNI 30 D
Page 4: ...4 ...