Installation Of The Hydraulics - Kesla proG 20 Manual

GRAPPLES – USER MANUAL 10

4.3. INSTALLATION OF THE HYDRAULICS

Use hoses of proper diameter and pressure class.
Take care of cleanliness in all hydraulic installations.
Check hydraulic pressure. The pressure must not exceed the
value given on the machine plate.
When installing hoses, make sure that the hoses do not rub
against each other or against other parts of the grapple's
structure. Check this by opening and closing the grapple jaws
several times.
Removal of air from cylinders:
Fully open the jaws. Carefully open the hose coupling on the rod
side and allow air to escape (Note! Air is always in the upper part
of a cylinder), then tighten the hose coupling. Close the grapple
jaws, and repeat the procedure for the coupling at the bottom.
Repeat this until no further air is released.
Air in the cylinder may damage seals.
Adjust pressure to suit the grapple. See the correct model-specific
pressure from the technical specifications of the grapple.
Do not exceed specified pressure values. Risk of an
accident!
Grapple cylinder must be protected by pressure relief/ anti-cav
valve. Use shock valves in both A and B ports of the directional
valve of the crane.
Choose pressure set of the shock valves 2Mpa higher than max
pressure of the grapple.