Lukas LS530EN - Manual (Page 11)

11
Cutter unit
• No leakages
• Easy operation of the star grip
• Handle existing and fast
• Check of central bolt tightening torque (see also drawing to Section 13.3.1)
M
A
= Torque (see item 15.2)
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 (not coupled)
Through uncorrect hose connection or temperature increase pressure can be built up
in the cylinder unintentionally. Therefore, the return hose (0,5 m / 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 M
A
= 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.