When Upper Structure Stops Swinging, It Makes Large Shock; When Upper Structure Stops Swinging, It Makes Large Sound - Komatsu PC130-8 Shop Manual

40 Troubleshooting
H-24 When upper structure stops swinging, it makes large shock
Trouble

• When upper structure stops swinging, it makes large shock.

Related
• Conduct the troubleshooting in working mode P.
information
Malfunction of swing PPC
1
valve
Possible causes
and standard
value in normal
state
Malfunction of swing PPC
2
slow return valves
Malfunction of swing motor
3
(safety valve)
H-25 When upper structure stops swinging, it makes large sound
Trouble

• When upper structure stops swinging, it makes large sound.

Related
• Conduct the troubleshooting in working mode P.
information
Malfunction of back pres-
1
sure check valve
Malfunction of swing motor
Possible causes 2
(safety valve)
and standard
value in normal
Malfunction of swing motor
3
state
(suction valves)
4 Swing machinery defective
PC130-8
Cause
a
Left work equipment control
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.)
The safety valve of the swing motor may have malfunction. Check
it directly.
Cause
The back pressure check valve may have a malfunction. Check it
directly.
The swing motor (safety valves) may have a malfunction. Check
the valves directly.
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.)
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.)
Standard value in normal state/Remarks on troubleshooting
Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
lever
In NEUTRAL
Operated for swing
Standard value in normal state/Remarks on troubleshooting
SEN04124-00
PPC valve output pressure
0 MPa {0 kg/cm }
2
Above 2.7 MPa
{Above 28 kg/cm }
2
1
1
25