All trucks
Technical Handbook
Hydraulic Cylinders
Service
9279 02-09
Publ. Gr. S.
1070
Wiper
The task of the wiper is to scrape the piston rod clean and prevent
any impurities being drawn into the cylinder pipe.
The wiper must be fitted with a special tool. This tool must have
a greater outer diameter than the wiper, so that the pressure
against the wiper ceases just as the wiper is pressed into posi-
tion. If the wiper should be pressed further in, the metal cap will
be deformed (se lower illustration) which would thereby reducing
the efficiency of the wiper.
To prevent the wiper “bottoming” in its slot in the cylinder head,
the slot in the cylinder head is somewhat deeper than the width
of the wiper.
The wiper can be removed without the necessity of dismantling
the cylinder. A screwdriver can be used to remove the wiper. This
must always be employed against the outer edge of the wiper,
see illustration. Carefully tap the screwdriver down between the
wiper and the cylinder head and thereafter, lever the wiper out.
Polish off any marks on the cylinder head.
KL1007
øD+10
øD
1
2
4
3
5
6
1. Correct fitting tool
2. Wiper, correctly fitted
3. Cylinder head
4. Play between the wiper and the
bottom of the cylinder head slot
5. Incorrect fitting tool
6. Deformed wiper
KL1012
1
2
3
1. Screwdriver
2. Wiper
3. Cylinder head
IMPORTANT!
No tools should be introduced from the inside. This can
score the cylinder pipe, which in turn, can damage the pis-
ton rod. Scoring can also damage the piston rod seals
when the piston is fitted.
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