Komatsu 80001 User Manual

SEN04123-01 40 Troubleshooting
46 PC130-8
Trouble (3) Air does not come out (Air flow is insufficient).
Related
information
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective blower relay (Inter-
nal disconnection)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON (coil side).
R20 (male) Resistance
Between (1) – (3) 140 – 340 z
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting (contact side).
R20 Air conditioner switch Voltage
Between (4) –
chassis ground
Air blow position 20 – 30 V
2
Defective power transistor
(Internal defect)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Fan switch
If air flow changes according to
operation of fan switch, power
transistor is normal.
Operate between Low and
Medium and High.
3
Defective blower motor
(Internal defect)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
M
B (wiring side) Air conditioner switch Voltage
Between (1) – (2) Air blow position 20 – 30 V
If above voltage is normal and blower motor does not revolve,
blower motor is defective.
4
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between F01-11 – fuse in
unit – R20 (female) (1)
Resis-
tance
Max. 1 z
Wiring harness between R20 (female) (3) –
AC
W (wiring side) (36)
Resis-
tance
Max. 1 z
Wiring harness between F01-11 – R20
(female) (5)
Resis-
tance
Max. 1 z
Wiring harness between R20 (female) (4) –
M
B (wiring side) (1)
Resis-
tance
Max. 1 z
Wiring harness between M
B (wiring side) (2)
– P
TR (wiring side) (3)
Resis-
tance
Max. 1 z
Wiring harness between P
TR (wiring side)
(1) – chassis ground (T07)
Resis-
tance
Max. 1 z
Wiring harness between P
TR (wiring side)
(2) – AC
W (wiring side) (8)
Resis-
tance
Max. 1 z
Wiring harness between P
TR (wiring side)
(4) – AC
W (wiring side) (7)
Resis-
tance
Max. 1 z

Komatsu 80001 Specifications

General

Brand	Komatsu
Model	80001
Category	Excavators
Language	English