OPERATING INSTRUCTIONS RH 120 E Inspection and servicing Checking the greasing pressure Check every week, whether the oil pressure indicated by pressure gauge (4, Fig. 3-102:) is 60 bars / 870 psi (the pressure is dependind on temperature and viscosity of the oil and may vary).
The necessary greasing pressure is generated by means of a pressure translator. The greasing pressure is indicated by pressure gauge (9). In the event of deviating pressure values, switch off the electric motor and check the central greasing system. Lower oil pressure means that not all of the greasing points are supplied with grease. Higher oil pressure may cause bursting of a greasing line.
Always refill the grease container in time to avoid air from penetrating into the greasing system. Air in the greasing may cause malfunctions. Fig. 3-102:
This oil pressure is reduced so that the pressure indicated by pressure gauge (3, Fig. 3-103:) is 35 – 40 bars / 507 – 580 psi.
Unblocking a grease line. Put the excavator back into operation only after the lubricating system works properly and after having actuated the unloaded working equipment for abt. 5 minutes. This is necessary in order to supply sufficient amounts of grease to the cylinder bearings. Check the grease sieve regularly for contamination and clean, if required. The grease sieve must also be cleaned after an obstruction in one of the grease lines.
Cleaning " Loosen nut (6, Fig. 3-102:). " Withdraw sieve and clean with white spirit or paraffin oil. Fig. 3-103:
BA RH120E(3 668 330.00)-EN
" Re-insert sieve and fasten with nut (6).
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