Simon, Evers & Co HPN 25 S Instrucciones De Servicio página 42

2) The forks cannot be raised
No oil in the tank
The oil is contaminated
The outlet valve is maladjusted
Air is getting into the oil
3) The forks cannot be lowered
The rod (343) and the cylinder
(340) are deformed as a result
of the load not having been
balanced several times
Individual parts are deformed as
as a result of the load not having
been balanced
The unit has been parked for a
lengthy period with the forks raised
and the rod (343) exposed so that
rust has formed.
The setting screw (324) is not
positioned correctly
4) Leaks
Seals are worn or damaged
Some parts are torn or worn
5) The forks lower without the outlet valve functioning
The outlet valve (321) does not
close properly due to contamination
in the oil
Air is getting into the oil
Seals are worn or damaged
The outlet valve is maladjusted
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Top up the oil
Change the oil
Adjust the setting screw (324)
Remove the oil (see III.2)
Replace the rod (343) or the
cylinder (340)
Repair or replace the deformed parts
Remove the rust from the rod (343)
and lower the forks as far as possible
when the unit is not in use
Adjust the setting screw (see II.4)
Replace the seals
Check and replace these parts
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Replace the oil with fresh oil
Remove the oil (see III.2)
Replace the seals
Adjust the setting screw (324)