EP Equipment CQD16, Service Manual

Page: 103 / 251

89
REV. 07/2016
HYDRAULIC SYSTEM
7
7.8.4 Cylinder Maintenance
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Use suitable hose clamps to avoid cylinder
deformation caused by severely tight hose
clamp.
Carry out the maintenance work in a clean
environment to prevent impurities from enter-
ing into cylinder, causing cylinder damage;
During the installation, hydraulic oil of
the same specifications must be used for
cleaning or lubrication.
CAUTION
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Secure the cylinder to hose clamp and gently
clamp the cylinder bottom;
Unscrew the cylinder cap (5, Figure 90416)
with cylinder wrench;
Pull out the piston rod (1) from cylinder block
(7);
Remove the seal (9) and support ring (10) on
the piston;
Unscrew the lock screw (11) from the piston
and unscrew the piston (8) from the piston
rod (1);
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Remove the sleeve (15) and remove the two
O-rings (3) inside it;
Remove the cylinder cap (5) and remove its
dust ring (2), O-rings (3), seal (4), O-ring (6)
and O-ring (16);
Clean with hydraulic oil of the same specifi-
cations;
Replace the problem parts and assembly in
reverse steps.
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If the piston rode or cylinder tube is damaged,
please replace the entire cylinder.
If the seals are aged or damaged, please
replace the complete set of seals.
When replacing or repairing the cylinder,
please refi ll the lubricant through the grease
nipples at both ends of the cylinder.
CAUTION