Speed Or Power Of Bucket Is Low; Work Equipment Does Not Move Singly - Komatsu PC210-8 Shop Manual

UEN00245-02
H-9 Speed or power of bucket is low
Trouble

• Speed or power of bucket is low.

Related
• Carry out all troubleshooting in power mode (P) of working mode.
information
Malfunction of right PPC
1
valve (bucket circuit)
Malfunction of bucket control
2
valve (spool)
Possible
causes and
Malfunction of bucket control
standard value
3 valve (pressure compensa-
in normal state
tion valve)
Malfunction or defective seal
4 of bucket control valve
(safety-suction valve)
Malfunction of service con-
5
trol valve (LS shuttle valve)
6 Defective bucket cylinder
H-10 Work equipment does not move singly
(1) Boom does not move singly.
Trouble (2) Arm does not move singly.
(3) Bucket does not move singly.
Related
• Carry out all troubleshooting in power mode (P) of working mode.
information
Possible
causes and 1 Malfunction of PPC valve
standard value
in normal state
Malfunction of control valve
2
(spool)
14
Cause Standard value in normal state/Remarks on troubleshooting
a
Right work equipment control
Spool of bucket control valve may have malfunction. Check it
directly.
Pressure compensation valve of bucket control valve may have
malfunction. Check it directly.
Safety-suction valve of bucket control valve may have malfunction
or defective seal. Check it directly.
LS shuttle valve of service control valve may have malfunction.
Check it directly.
a
Right work equipment control
Cause Standard value in normal state/Remarks on troubleshooting
a
Work equipment control lever
Spool of control valve may have malfunction. Check it directly.
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
lever
Neutral
Bucket curl
Bucket dump
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
lever
Bucket curl relief
Prepare with engine stopped, then run engine at high idle and
carry out troubleshooting.
Neutral
Operated
40 Troubleshooting
PPC valve output pressure
0 MPa
2
{0 kg/cm }
2.84 – 3.43MPa
2
{29 – 35 kg/cm }
Leakage from bucket cylinder
20 cc/min
PPC valve output pressure
0 MPa
{0 kg/cm 2 }
2.84 – 3.43 MPa
2
{29 – 35 kg/cm }
PC210, 230, 240-8
1
1