Lukas LKS 55 EN - Manual (Page 10)

10
Hoses
• check according safety instructions for hoses (see item 5)
• Check for oil leakage
Function testing
• Perfect opening and closing with the star grip valve.
13 Repairs
13.1 General
Servicing must be carried out only by the device manufacturer or by personnel trained by the
manufacturer or the authorised LUKAS dealers.
For replacement on all components, use only genuine LUKAS spare parts as specified in the spare
parts list, as here possibly required special tools, mounting information, safety aspects, testing
must absolutely be taken into account. See Section 4.
Protection of the device against hydraulic overload
Through uncorrect hose connection or temperature increase pressure can be built up in the cylinder
unintentionally. Therefore, the return hose (0,5m / blue) of the tool is equipped with a safety coupling
(quick connect plug, colour yellow). Overpressure (approx. 1.5 MPa) is released through this plug:
oil comes out. This oil is not a malfunction of the plug!
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.
13.2 Preventive maintenance
13.2.1 Routine inspections
Regularly check the central bolt tightening torque. MA = Torque (see item 15.2)
Damaged blades can be repaired by regrinding of the cutting edge up to a total of 0.5 mm. Special
care must be taken to have the inner cutting faces run parallel.
13.2.2 General inspections
The mechanical transmission elements of the cutter unit are subjected to very high mechanical
stressing and must, therefore, be inspected at certain intervals. This helps to detect wear early so
that fractures of these wearing parts can be prevented by replacing them in time.
Parts in perfect condition can be fitted again after careful application of LUKAS special grease for
cutter units.
Parts with insignificant wear (fretting marks) can be repaired by polishing and fitted again after
greasing.
More pronounced wear marks require replacement of the damaged parts (by pairs).
At these intervals, crack testing of the cutter blades is equally mandatory. For this purpose, a special
crack test kit is available.
To protect the device against external corrosion clean its surface from time to time and slightly
grease it with oil.
13.2.3 Function and load test
If there is any doubt as to the safety and reliability of the equpiment, carry out an additional function