July 2020
Installation, Operation and Maintenance Manual
MAN 573 Rev. 8
Section 6: Troubleshooting
6.1
Failure or Breakdown Research
Table 10.
Event
Possible cause
Remedy
Actuator does not work
Lack of power supply
Restore it
Clogged filter
Clean or replace the cartridge
Blocked valve
Repair or replace
Failure of the spring
Call Biffi Italia s.r.l. Customer Service
Failure of the control system
Call Biffi Italia s.r.l. Customer Service
Low supply pressure
Restore (Section 1.4)
Actuator too slow
Low supply pressure
Restore (Section 1.4)
Wrong calibration of flow regulator valves
Restore (Section 3.6)
Wear of the valve
Replace
Actuator too fast
High supply pressure
Restore (Section 1.4)
Wrong calibration of flow regulator valves
Restore (Section 3.6)
Leakages on
hydraulic circuits
Deterioration and/or damage to gaskets
Call Biffi Italia s.r.l. Customer Service
Incorrect position of
the valve
Wrong adjustment of mechanical stops
Restore (Section 3.4)
Wrong warning of micro-switches
Restore (Section 3.5)
Irregular movement
of actuator or lower
torque value
Wrong adjustment or unscrewing of thrust
bearing-screw
See following Figure
Figure 18
(Please refer to Figure 17, Section 5.2.1)
Screw the thrust bearing screw (15), complete with the sliding block (19), into the threaded hole of
the housing until it reaches the correct original position.
Check that the sealing washer (18) and the washer (27) are in contact with the housing surface.
Tighten the lock nut (26).
Restore the correct position of thrust bearing-screw
Troubleshooting
28
Section 6: Troubleshooting
