Lukas Telescopic Rams - Manual (Page 6)

6
5.2 Coupling connectors
Apart from the coupling connectors, these cylinder models are also provided with two connector
blocks with a safety valve, thus preventing damage to the cylinder in the event of external loads.
If pressure exceeds the maximum permissible value, the safety valve will open automatically, and
oil will squirt out (protected).
5.3 Hoses between control desk and cylinders
Those are normally connected via 10 m long hose pairs (red/blue, ref. 84072/1765). All hoses
are duly colour marked and equipped with quick couplers in non-interchangeable design:
- connection to A (= extension)
red,
- connection to R (= retraction) blue.
5.4 Quick-connect couplers
5.4.1 Hose pair red/blue 84072/1765
The hose couplings of this hose pair are equipped with a „quick-stop“ function which will block the
oil reflow from the cylinder if, for example, a hose breaks, thus preventing the load from being
dropped. When lowering a very heavy load or when switching the control valve to „lowering“ position
too quickly, the quick-stop may catch without there being a necessity for it. Then the cylinder can
no longer be retracted. In this case switch the selector valve to „lifting“ again until the cylinder starts
to extend. Carefully start the lowering procedure again.
5.4.2 Single hose, red
The quick-stop feature is optional for this hose. It requires the use of the StMu 61-M coupling sleeve
(colour silver or yellow).
5.4.3 Connection of quick couplers
- 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.