Nilfisk-ALTO NEPTUNE 5-46 PE, Service Manual

Page: 66 / 94

G
NEPTUNE PE-DE_en_Ver.1.0_October 2010
Adjustment / Test
66
Adjustment of by-pass system.
C3 pump
Pos. 1 Safety valve adjustment
Pos. 2 Set screw for min. Water adjustment
Pos. 3 Min. Water adjustment screw
Minimum water volume (and pressure) adjustment:
First mount test manometer with correct high pressure test nozzle.
Turn the black handle on the water regulator all the way clockwise. (Min. Water volume)
Start the motor and run at full RPM.
Test manometer must show approx. 30 bar. If this is not the case, loosen set screw (pos. 2),
and then turn the min. Water adjustment screw (pos. 3) untill you reach approx. 30 bar.
Safety valve adjustment:
First mount test manometer without test nozzle—just open outlet.
Turn the black handle on the water regulator all the way counterclockwise. (Max.. Water vol-
ume)
Start the motor and run at full RPM.
Slowly close the valve on the test manometer, and read the pressure when the safety valve
opens. (That will be the pressure just before the pressure drops)
The opening pressure for the safety valve must be 25-30 bar above normal working pressure.
To adjust the opening pressure, loosen the lock nut (pos. 1) with a 22 mm Open/ring spanner.
Then adjust the safety valve by turning the adjustment screw with a 6 mm. Allen Key, When
turning clockwise—opening pressure increases, and counterclockwise it decreases.
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