40 Troubleshooting SEN04124-00
PC130-8
25
H-24 When upper structure stops swinging, it makes large shock 1
H-25 When upper structure stops swinging, it makes large sound 1
Trouble • When upper structure stops swinging, it makes large shock.
Related
information
• Conduct the troubleshooting in working mode P.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Malfunction of swing PPC
valve
a Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Left work equipment control
lever
PPC valve output pressure
In NEUTRAL 0 MPa {0 kg/cm
2
}
Operated for swing
Above 2.7 MPa
{Above 28 kg/cm
2
}
2
Malfunction of swing PPC
slow return valves
The swing PPC slow return valves may have a malfunction. Check
them directly. (They may be checked by exchanging with each
other and checking change of the phenomenon.)
3
Malfunction of swing motor
(safety valve)
The safety valve of the swing motor may have malfunction. Check
it directly.
Trouble • When upper structure stops swinging, it makes large sound.
Related
information
• Conduct the troubleshooting in working mode P.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Malfunction of back pres-
sure check valve
The back pressure check valve may have a malfunction. Check it
directly.
2
Malfunction of swing motor
(safety valve)
The swing motor (safety valves) may have a malfunction. Check
the valves directly.
3
Malfunction of swing motor
(suction valves)
The swing motor (suction valves) may have a malfunction. Check
the valves directly. (They may be checked by exchanging with
each other and checking change of the phenomenon.)
4 Swing machinery defective
The swing machinery may have a defect in it. Check it directly. (It
may be checked by abnormal sound, abnormal heating, metal
chips in drain oil, etc.)
To Next Page
Loading...
Need help?
General
