Kubota KX91-3a Workshop Manual page 187

WSM Minor Change
Check item
Motor Tr1, Tr2, Tr3, and Tr4 output
Input & output AI operation switch input, travel
switch input
Motor Tr1, Tr2, Tr3, and Tr4 output
Input & output AI operation switch input, travel
switch input
Motor Tr1, Tr2, Tr3, and Tr4 output
10 Input & output AI operation switch input, travel
switch input
Motor Tr1, Tr2, Tr3, and Tr4 output
Input & output AI operation switch input, travel
switch input
Motor Tr1, Tr2, Tr3, and Tr4 output
Input & output AI operation switch input, travel
switch input
AUX sol (positive) (R) output,
Input & output
compressor clutch switch input
11
AUX sol (positive) (R) output,
Input & output compressor clutch switch input
AN2_7 input
AUX sol (negative) (L) output,
Input & output
AI pressure switch input
12
AUX sol (negative) (L) output,
Input & output
AI pressure switch input
AI self-hold relay output, breaker
Input & output
switch and AUX switch input
13
AI self-hold relay output, breaker
Input & output
switch and AUX switch input
AD (Analog and
14 fuel sensor
digital conversion)
AD (Analog and
15 water temp sensor
digital conversion)
AD (Analog and
16 motor potention sensor
digital conversion)
AD (Analog and
17 accel potention sensor
digital conversion)
AD (Analog and
18 AUX potention sensor
digital conversion)
Check parts
Motor Tr1, Tr2, Tr3, and Tr4 are set to low output
level.
The AI operation switch is set to low level. The
travel switch is set to low level.
Motor Tr1 is set to high output level and Tr2, Tr3,
and Tr4 are set to low output level.
The AI operation switch is set to high level. The
travel switch is set to high level.
Motor Tr1 and Tr4 are set to high output level and
Tr2 and Tr3 are set to low output level.
The AI operation switch is set to high level. The
travel switch is set to low level.
Motor Tr2 is set to high output level and Tr1, Tr3,
and Tr4 are set to low output level.
The AI operation switch is set to high level. The
travel switch is set to high level.
Motor Tr2 and Tr3 are set to high output level and
Tr1 and Tr4 are set to low output level.
The AI operation switch is set to low level. The
travel switch is set to high level.
Turn OFF the AUX sol (positive) (R) and make
sure that the compressor clutch switch is set to low
level.
Turn ON the AUX sol (positive) (R) and make sure
that the compressor clutch switch is set to high
level.
The AN2_7 AD value varies more by 25 mV or
more from the value with the input turned OFF.
From theoretical values, 12 V and 240 : 50 mA
Voltage fluctuation corresponding to 50 mA: 50 mV
Turn OFF the AUX sol (negative) (L) and make
sure that the AI pressure switch is set to low level.
Turn ON the AUX sol (negative) (L) and make sure
that the AI pressure switch is set to high level.
Turn OFF the AI self-hold relay and make sure that
the breaker switch and AUX switch are set to low
level.
Turn ON the AI self-hold relay and make sure that
the breaker switch and AUX switch are set to high
level.
Check with the microcomputer that the AD value is
1.8 V ± 0.15.
Check with the microcomputer that the AD value is
2.5 V ± 0.15.
Check with the microcomputer that the AD value is
3.75 V ± 0.15.
Check with the microcomputer that the AD value is
2.5 V ± 0.15.
Check with the microcomputer that the AD value is
1.25 V ± 0.15.
II-175
II Service Engineering Section
Check methods
Fail
indication
No.
8
9
10
11
12