Lukas LZR 12-700 EN - Manual (Page 11)

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Should the tool have been equipped with couplers of different brand which do not have this safety
function, overpressure would be released through another safety valve (adjusted to approx. 30
MPa) included with the control valve block. In this case oil spill would be observed in the star grip
area.
As soon as sufficient pressure is released the valve becomes tight again. Should further constant
leakage ocur, please have the tool inspected by LUKAS personnel.
On repair, protective clothing is mandatory (see Section 1), as the cutter units can be pressurized
also in unoperated state.
11.2 Preventive maintenance
11.2.1 Maintenance advice
To protect the device against external corrosion clean its surface from time to time and slightly
grease it with oil.
11.2.2 Maintenance and service work
For maintenance work, LUKAS offers a service kit as appropriate equipment.
11.2.3 Function and load test
If there is any doubt as to the safety and reliability of the equpiment, carry out an additional function
and load test. For this purpose, LUKAS offers a test kit as appropriate equipment.
11.2.4 Change of hydraulic oil
- after 200 uses, latest after 2 years, the hydraulic oil has to be changed.
- in any case if the oil of the pump (motor / hand pump) which belongs to the unit is changed.
By changing the used oil, it should be avoided that the new oil is polluted by the used oil of the
rescue tool.
Procedure:
The rescue tool is in closed (retracted) position • Change of oil has to be effected at the pump.
Screw off the return hose at the pump:
- in case of hose connection: screw off the connecting piece of the blue return hose.
- in case of quick connect couplings: screw off totally the coupling nut of the quick connect
coupling of the blue return hose.
Extend pump with tool slowly • Collect the used oil at the piston rod side in a separate tank and
dispose of the used oil (as the used oil of the pump) • Do not operate the pump any longer.
Connect the return hose again to the pump:
- Tighten the coupling nut of the quick connect coupling according to 11.3.3,
- Screw the hose nipple into the valve bloc with MA = 45 Nm,
- Ventilate the tool according to 8.1.1.
11.3 Repairs
11.3.1 Oil spill out of the control valve handle
Pressure or return hose are not tightened properly.
Procedure:
Loosen the 2 allen screws (SW5) inside the handle sleeve and remove them together with the short
plastic isolation sleeves. Pull handle sleeve backwards until the hose connection points become
visible and retighten the retaining nut. Change hose connection sealing rings if necessary. Place
handle sleeve again and tighten it with the 2 allen screws. Make sure that the plastic isolation
sleeves are placed properly on the allen screws before mounting.