8
DOUBLE ACTING HYDRAULIC SYSTEM
The double acting hydraulic cylinders are fitted with two female quick couplers. If you have to fit the
couplers in the cylinder, apply teflon around the 3/8" NPT male thread of the coupler.
Assemble the device in accordance with the instructions given in the diagram, first checking that you have
all the necessary material.
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Remove the dust protectors from the quick couplers and from the hoses.
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Clean quick couplers, hoses ends and connectors.
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Screw the male couplers to one end of the hose. For that, apply teflon around the 3/8" NPT male thread
of the hose.
The right connection of the couplers is very important because with
a wrong connection the system
does not work and also can cause overpressure that can break the cylinder
. Note which hose connects
to the advance chamber and which one to the return chamber. Connect the hose from the return
chamber and then connect the hose from the advance chamber. The couplers only must be connected
or disconnected when the hoses are depressurised.
For safety, as an option, a pilot operated check valve AZ5700 can be mounted to hold the load until the
pressure in the return line actuates the valve.
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Screw the hose from the return chamber to the pump. For that, apply teflon around the 3/8" NPT male
thread of the coupler.
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Connect the other hose end to the cylinder (return chamber), tightening completely the couplers (first
insert as far as the plug will go and then screw it by hand).
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Connect the second hose from the pump to the advance chamber, following the same procedure as with
the first hose.
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Ensure the connections are perfectly engaged to ensure the correct function of the system.
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Bleed the cylinder. Locate the pump on a higher level than the cylinder, with the piston pointing
downwards and the coupler upwards. Extend and retract the cylinder several times, until it operates
properly.
DOUBLE ACTING SYSTEM WITH 1 CYLINDER
Ensure that all the equipment and accessories are suitable for
the maximum working pressure.