Scraper
Guide ring
OR on the thread
Main seal
Guide ring
OR joint
Iron ring
WITTUR HYDRAULIC DRIVES
Soggetto a modifica senza preavviso!
Subject to change without notice!
Pagina/Page
D842MGB.010
Data/Date
09.2008
Versione/Issue
1
Hydraulic cylinders
Operating instructions
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Clean the cylinder head, unscrew completely the
screw of the counter-pressure. Make the rod break
back with the hand manoeuvre until the
manometer shows pressure = zero.
Unscrew the threaded iron ring holding the seals.
Remove the old seal, the O’ring on the thread and the
scraper.
Control and clean the guide rings and position them in
their place. (Have access to the second guide ring by
taking out the metal bush, laying under the iron ring,
screwing two small screws M3 on the bush itself to lift it).
Clean and control the seats, reassemble the new seals,
paying attention not to damage them and position them
in the same way as the old ones. (The writing “PRESSURE
SIDE”, if existing, has to be turned toward the cylinder
inside!).
Reassemble the bush (in case it has been taken out),
screw again the iron ring with the new seal, purge the
air and put the installation into action.
In case of direct acting installation disconnect the rod
from the frame. While in case of indirect acting ones,
disconnect the rod from the pulley.
Block the car, using stops in the most comfortable
position. In case of indirect acting installations,
block with a stop even the support of the pulley.
Get rid of any irregularities found visually or
touching it by using a thin abrasive paper (320 ÷
400). In case scores are deep or damages are
important, fix the paper on a wooden support.
Check the rod surface half metre by half metre, all along
its length, making a slow down travel with hand
emergency.
Draw. n. 6 Replacement of the seal on a one-stage cylinder
After having controlled the last half metre of the rod,
operate to replace the seals.
OMAR LIFT
