Komatsu PC130-8 User Manual

40 Troubleshooting SEN04123-01
PC130-8
5
Information in troubleshooting table 1
a The following information is summarized in the troubleshooting table and the related electrical circuit
diagram. Before carrying out troubleshooting, understand that information fully.
Related circuit diagram
Trouble Trouble which occurred in the machine
Related
information
Information related to detected trouble or troubleshooting
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
2
3
4
Possible causes of trouble
(Given numbers are refer-
ence numbers, which do
not indicate priority)
<Contents of description>
• Standard value in normal state to judge possible causes
• Remarks on judgment
<Troubles in wiring harness>
• Disconnection
Connector is connected imperfectly or wiring harness is
broken.
• Ground fault
Wiring harness which is not connected to chassis ground
circuit is in contact with chassis ground circuit.
• Hot short
Wiring harness which is not connected to power source (24
V) circuit is in contact with power source (24 V) circuit.
•Short circuit
Independent wiring harnesses are in contact with each other
abnormally.
<Precautions for troubleshooting>
1) Method of indicating connector No. and handling of T-
adapter
Insert or connect T-adapter as explained below for trouble-
shooting, unless otherwise specified.
• If connector No. has no marks of “male” and “female”,
disconnect connector and insert T-adapters in both male
side and female side.
• If connector No. has marks of “male” and “female”, dis-
connect connector and connect T-adapter to only male
side or female side.
2) Entry order of pin Nos. and handling of tester leads
Connect positive (+) lead and negative (–) lead of tester as
explained below for troubleshooting, unless otherwise
specified.
• Connect positive (+) lead to pin No. or wiring harness
entered on front side.
• Connect negative (–) lead to pin No. or harness entered
on rear side.
This drawing is a part of the circuit diagram related to troubleshooting.
• Connector No.: Indicates (Model – Number of pins) and (Color).
• “Connector No. and pin No.” from each branching/merging point:
Shows the ends of branch or source of merging within the parts of the
same wiring harness.
• Arrow ( ): Roughly shows the location on the machine.

Komatsu PC130-8 Specifications

General

Brand	Komatsu
Model	PC130-8
Category	Excavators
Language	English