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Service / Repair

NEPTUNE 1&2_EN_Ver.2.1_45/2014 74

To take out the valves remove the six screw

plugs (17 mm wrench).

Pull out the valves by means of a nose pliers.

Bear in mind the o-ring.

Inspect valves/seats and replace if necessary.

Grease o-ring lightly.

Fig.F.13: Valve Block 3 ~ - Plug removal

Valve Maintenance 3~

Fig.F.14: Valve Block 3 ~ - Valve replacement

 Inspect valves/seats and replace if

Necessary as described in Fig.F12.

Fig.F.15: Valve Block – Valve replacement -



Grease O-rings lightly.

 Place the valve in the valve chamber.

 Press down firmly on top of the valve.

 Fit screw plug applying Loctite 243.

 Torque 44Nm (33ft.lbs).

Valve Maintenance Seal and V - Packing Maintenance

Fig.F.16: Valve Block - Thrust Collar Removel



The seals and V - packings are identical for

the 1 ~ and 3 ~.

By use of a combination pliers remove the

thrust collar.

Beware not to damage the packing ring.

Inspect the seals and packings for wear and

replace them if necessary.

Neptune 2

Nilfisk-ALTO NEPTUNE 1 Service Manual

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