1 Make sure that the drain plug located below the oil reservoir is
tight.
2 Loosen the nut adjusting the RECIRCULATION VALVE spring
(pos 105).
3 After loosening the lock nut (pos 112), loosen the nut (pos
113) adjusting the RESET VALVE spring (pos 104).
4 Start the pump
5 Pour oil in the tank up to the mark and press the RESET
VALVE 104; the oil will start flowing into the oil reservoir.
6 Repeat the operation until it is possible to see oil oscillating
inside the tank. At this point, the oil reservoir is full.
7 Slowly tighten the adjustment nut (pos.113) of the reset spring
(pos.109) until the oil in the tank is still. This operation must
be performed in the actual operating conditions
8 Pressurise the system by closing valve "1" and opening valve
"2"; the oil in the tank will oscillate.
9 Slowly tighten the LOAD NUT (pos.105) of the recirculation
spring (pos. 108) until oil is still and the pressure gauge "3"
indicates the system’s pressure
❑ To check whether the operation was successful, proceed
as follows:
10 Close valve "2", recirculation will begin to recycle oil and pressure gauge "3" will indicate the
calibration pressure (that must be greater than 15/20% of the reading with valve "2" open).
11 By opening valve "2", recirculation will return motionless.
12 Close valve "4", recirculation will begin to recycle, by opening valve "4" recirculation will return
motionless.
N.B.: If air bubbles are noticed when the oil oscillates inside the tank, it means:
that you exceeded in calibrating the reset valve spring, POINT 7, (repeat operations from
POINT 7 onwards).
❑ In case of excessive pressure drops in suction;
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