Lukas Double-acting Rope-lift cylinder - Manual (Page 6)

6
Y
X
5.2 Connecting pieces
In addition to the quick-connect couplings, these cylinder models are fitted with two connecting
blocks with a safety valve to prevent damage to the cylinder under external load. If the specified
maximum pressure is exceed, the safety valves automatically open and oil (protected) is squirted
out.
5.3 Hoses between the control table and cylinders
Connection is normally made with 10 m hose pairs red/blue (order no. 84072/1765). All hoses are
fitted with quick-connect couplings and colour coded to prevent them being connected incorrectly:
-
Connection to A (= “extend”) red
- Connection to R (= “retract”) blue
5.4 Quick-connect couplings
5.4.1 Hose pair compliant with 84072/1765
The hose connectors of this hose pair are fitted with a “quick-stop function” as standard that, for
instance, blocks oil backflow out of the cylinder and prevents the load from lowering if a hose breaks.
The quick stop may be triggered unintentionally when a very heavy load is lowered or the switch
control valve is switched to “Senken” (lowering) too quickly. It will then no longer be possible to
retract the cylinder. If this happens, switch the switch control valve to “Heben” (lifting) until the
cylinder starts to extend. Carefully start the lowering procedure again.
5.4.2 Connection of quick-connect couplings
- Remove dust protection covers.
-
Unlock connect socket with adjusting ring by turning it.
- Retract sleeve and connect plug and socket while holding the sleeve in this position.
- Release sleeve and lock adjusting ring: showglass is “RED”.
The connection has now been made and secured.
Note regarding the modified release mechanism as of June 2004
Whenever a connection is made, note the basic functions of the quick-connect couplings
described below:
Prior to making the connection, pull back and hold the plug locking sleeve in position (position X).
Fit the socket and plug together and release the locking sleeve. Then turn the locking sleeve to
position Y.
The connection has now been made and locked. Disconnection is made in the reverse order.
It is only possible to connect devices when the hoses are depressurised.
The provided dust protection caps are used to protect against dust.