Komatsu PC58UU-3 User Manual

TROUBLESHOOTING M-12
PC58UU-3 20-613
M-12 Related Electrical Circuit Diagram
M-12 Alarm buzzer sounds for 7 seconds and electric system cau-
tion lamp blinks while emergency work equipment operation
switch is not turned on
1
Cause Remedy
• Emergency work equip-
ment operation switch
OFF: Max. 1 V
ON: 10 - 15 V
• Turn starting switch ON.
Is voltage between G3 (30) and
chassis ground normal?
No
YES
2
• When normal: 0 - 15 V
When abnormal: Max. 1 V
• Turn starting switch ON.
Is voltage between G3 (8) and
chassis ground normal?
No
Defective controller Replace
YES
Defective monitor panel Replace
3
• Turn starting switch OFF.
Is continuity between F25 (male)
(1) and (2) as shown in Table 1?
No
Defective reset switch Replace
YES
Contact with power
source wiring harness in
wiring harness between
G3 (female) (30) - F25
(female) (1)
Repair or
replace
Table 1
Emergency work equipment operation switch 1 2 3
ON (RAISE) O O
OFF (LOWER) O O
(6)

Komatsu PC58UU-3 Specifications

General

Brand	Komatsu
Model	PC58UU-3
Category	Construction Equipment
Language	English