Nilfisk-ALTO NEPTUNE 4 FA Service Manual page 51

Fig.G.13: Pressure bolt
When adjustment is done, lock the bolt with
the counter nut.
NOTE: If the cut off pressure is adjusted too
high > 60 bar higher than working pressure,
the by-pass valve can be damaged due to fast
and hard movements during the change from
working pressure to by-pass pressure.
NEPTUNE 4 FA_EN_Ver.2.0_ 22/11
Adjustment / Test
Fig.G.14: Safety valve
Let the machine run 5 bars lower than the cut
off pressure (working + adjustment) and adjust
the safety valve out (Counter clockwise) until it
couples out (go into bypass). Then you turn
the adjusting "screw" a ½ turn back
(Clockwise) and lock it with the counter nut.
Open and close the pressure gun a couple of
times to check the adjustment.
Finalize the adjustment with locking glue/paint
on both the bolt and the safety valve.
G
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