TROUBLESHOOTING /SYSTEM PERFORMANCE Troubleshooting
Ｄ-1. Lift arm fails to rise or is slow to rise.
（４）Drop in shovel main relief valve pressure or faulty main pump
Measure the shovel control valve main pressure. Measure the main relief pressure in accordance with the description in the section of measurement of system performance. Standard main oil pressure value：２０．６MPａ（２１０ kgf／ｃｍ2）
Drop in main pressure
Adjust the relief valve set pressure or replace the valve.
1KN 2TGUUWTG 2QTV
6KNV %[NKPFGT Oil pressure does not rise even after the abovementioned
Adjust the overload relief valve, or repair or replace the main pump.
2TGUUWTG &GETGCUG
2TGUUWTG +PETGCUG
.QEM 0WV /CKP 4GNKGH 8CNXG
#FLWUVKPI 5ETGY
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