Nilfisk-ALTO NEPTUNE 4 FA Service Manual page 42

Replacement of secondary seals and header ring
Fig.F.24: Header ring
Fig.F.25: Damaged header ring
NEPTUNE 4 FA_EN_Ver.2.0_ 22/11
Service / Repair
Pic.9. Showing the right position of the
header ring. Knob on header ring must
be placed in groove against the centre
of the cylinder head.
If the header ring is mounted wrongly and not according
to instruction, there is a big risk of damaging the header
ring and parts of it will block pistons and valves in the
pump or get stucked in the non return valve in the unloa-
der.
F
40