Komatsu PC58UU-3 User Manual

PC58UU-3 20-351
TROUBLESHOOTING
E-23 When work equipment lock lever is set to FREE position, work
equipment does not move
a Perform the following troubleshooting when error code [61] (Valve open) is not displayed.
a This system does not self-diagnose disconnection.
a If fuse (3) is broken, inspect from fuse (3) to relay (R2) (1) for PPC lock circuit.
Cause Remedy
• When lever is at LOCK:
10 – 15 V
• When lever is at FREE:
Max. 1 V
• Turn starting switch ON
1
Is voltage between F13 (1) and (2) nor-
mal?
NO
YES
See H-3
—
• When lever is at LOCK:
Min. 1 Mz
• When lever is at FREE:
Max. 1 z
• Turn starting switch OFF
2
Replace
Is resistance between PPC lock switch
F13 (male) (1) and (2) normal?
NO
Defective PPC lock switch
YES
3
• 5 – 25 z
• Turn starting switch OFF.
• Disconnect F7
Is resistance between F7 (male) (1) and
(2) normal?
NO
Defective PPC lock solenoid Replace
YES
4
• Replace R2 with normal relay.
When R2 is replaced, is condition nor-
mal?
NO
Defective relay (R2) for PPC
lock circuit
Replace
YES
5
Disconnection or defective
contact in wiring harness
between fuse (13) – F13
(female) (2)
•Max. 1
z
• Turn starting switch OFF
• Disconnect F13
Is resistance between fuse (13) and F13
(female) (2) normal?
NO
Replace
YES
6
Disconnection or defective
contact in wiring harness
between G3 (female) (5) –
F13 (female) (1)
•Min. 1M
z
• Turn starting switch OFF
• Disconnect G3 and F13
Is resistance between G3 (female) (5)
and VF13 (female) (1) normal?
NO
Repair or replac
e
YES
7
Disconnection or defective
contact in wiring harness
between R2 (female) (2) –
chassis ground
•Min. 1M
z
• Turn starting switch OFF
• Disconnect R2
Is resistance between R2 (female) (2)
and chassis ground normal?
NO
Repair or replac
e
YES
8
Disconnection or defective
contact in wiring harness
between R2 (female) (5) – F7
(female) (2)
Repair or replac
e
•Min. 1Mz
• Turn starting switch OFF
• Disconnect R2 and F7
Is resistance between R2 (female) (5)
and F7 (female) (2) normal?
NO
YES
•Max. 1
z
• Turn starting switch OFF.
• Disconnect G3 and R2.
• Measure on G3 side in diode
range
9
Defective diode (D7) or dis-
connection or defective con-
tact in wiring harness
between R2 (female) (38) –
R2 (female) (3)
Is resistance between G3 (female) (38)
and R2 (female) (3) normal?
NO
Repair or replac
e
Yes
To 10 on next page
E-23
(6)

Komatsu PC58UU-3 Specifications

General

Brand	Komatsu
Model	PC58UU-3
Category	Construction Equipment
Language	English