5-23
5
SLEWING
TROUBLESHOOTING
When stopped on a slope, the upperstructure cannot maintain its posture
1
Is the slew spontaneous
drop within specs?
Within specs
Normal
Out-of-specs
2 Check the slew pr
essure
Pressure too low
Adjust the relief valve
pressure of the slew brake
valve
Adjust to set pr
essure
Normal
Pressure does not rise
Repair or replace the slew re-
lief valve
3 Check the slew motor
Faulty
Repair
or replace the slew
motor
1. Is the slew spontaneous drop within specs?
“2. Service data, Performance criteria”
2. Check the slew pressure
“5-16”
3. Check the slew motor
“4. Disassembly and assembly, Slew motor”
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