20-410
PC130-7
TROUBLESHOOTING
E-3 Engine speed is unstable or engine hunts
Trouble
(1) Low idling speed is unstable.
(2) Engine hunts.
(3) High idling speed is low.
Related
information
• Since the governor and pump controller normally performs the following controls, the set opening angle
of the fuel control dial does not always conform accurately to the control angle of the governor motor.
1) Governor control by selecting working mode
2) Governor control by setting automatic decelerating function
3) Governor control according to operating condition of control lever
4) Governor control by automatic warm-up function in cold state
5) Governor control by turbocharger protecting function when engine is started
Accordingly, when checking the operation of the fuel control dial and governor motor, be sure to select
GOVERNOR ADJUSTMENT FUNCTION [03]. (Since the governor control function does not operate
in this mode, the set opening angle of the fuel control dial always conforms to the control angle of the
governor motor.)
• The engine speed can be checked with the monitoring function.
(Code: 010, by 10 rpm)
Possible causes
and standard
value in normal
state
Cause
Standard value in normal state/Remarks on troubleshooting
1
Defective governor
potentiometer
(Internal defect)
a
Turn starting switch ON and carry out troubleshooting (monitoring).
Monitoring code
Item
Normal display
002
Governor and pump
controller model code
130
003
If the monitoring display is abnormal, carry out troubleshooting for error
code [217].
2
Defective adjustment of
governor lever
See TESTING AND ADJUSTING, Special functions of monitor panel.
3
Malfunction of governor
motor
a
Turn starting switch ON or start engine and carry out troubleshooting.
When the following operation is performed, if the governor motor lever
moves smoothly, the governor motor is normal.
• Operate the fuel control dial between low idling and high idling.
• Stop the engine by turning the starting switch OFF.
4
Defective fuel control
system of engine
See the Shop Manual for 95-3 Seriese, Engine.
5
Disconnection in wiring
harness
(Disconnection in wiring
harness or defective con-
tact in connector)
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between C01 (female) (23) and
J07 and H15 (female) (5)
Resistance
Max. 1
z
6
Short circuit with chassis
ground in wiring harness
(Contact with ground
circuit)
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between C01 (female) (23) – J07 – H15
(female) (5) or other related circuit wiring har-
ness and chassis ground
Resistance
Min. 1
z
7
Defective governor and
pump controller
Troubleshooting cannot be carried out since the defect is in the gover-
nor and pump controller (If none of causes 1 – 6 is the cause of the trou-
ble, the governor and pump controller is defective).
E-3
(1)
Содержание PC130-7
Страница 6: ......
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Страница 86: ...20 168 PC130 7 TESTING AND ADJUSTING Items related to engine 1 PM CLINIC SERVICE...
Страница 87: ...PC130 7 20 169 TESTING AND ADJUSTING Items related to hydraulic equipment 1 PM CLINIC SERVICE...
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Страница 93: ...PC130 7 20 203 TROUBLESHOOTING SEQUENCE OF EVENTS IN TROUBLESHOOTING 1 SEQUENCE OF EVENTS IN TROUBLESHOOTING...
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Страница 113: ...PC130 7 20 223 TROUBLESHOOTING CONNECTOR ARRANGEMENT DRAWING AND ELECTRIC CIRCUIT DIAGRAM OF EACH SYSTEM 1...
Страница 114: ...20 224 PC130 7 TROUBLESHOOTING CONNECTOR ARRANGEMENT DRAWING AND ELECTRIC CIRCUIT DIAGRAM OF EACH SYSTEM 1...
Страница 115: ...PC130 7 20 225 TROUBLESHOOTING CONNECTOR ARRANGEMENT DRAWING AND ELECTRIC CIRCUIT DIAGRAM OF EACH SYSTEM 1...
Страница 116: ...20 226 PC130 7 TROUBLESHOOTING CONNECTOR ARRANGEMENT DRAWING AND ELECTRIC CIRCUIT DIAGRAM OF EACH SYSTEM 1...
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Страница 161: ...PC130 7 20 313 TROUBLESHOOTING Circuit diagram related to wiper motor 112 1...
Страница 163: ...PC130 7 20 315 TROUBLESHOOTING Circuit diagram related to wiper motor 113 1...
Страница 165: ...PC130 7 20 317 TROUBLESHOOTING Circuit diagram related to windshield washer motor 114 1...
Страница 167: ...PC130 7 20 319 TROUBLESHOOTING Circuit diagram related to wiper motor 115 1...
Страница 169: ...PC130 7 20 321 TROUBLESHOOTING Circuit diagram related to wiper motor 116 1...
Страница 171: ...PC130 7 20 323 TROUBLESHOOTING Circuit diagram related to swing holding brake solenoid 203 1...
Страница 173: ...PC130 7 20 325 TROUBLESHOOTING Circuit diagram related to 2 stage relief solenoid 205 1...
Страница 175: ...PC130 7 20 327 TROUBLESHOOTING Circuit diagram related to travel speed shifting solenoid 206 1...
Страница 177: ...PC130 7 20 329 TROUBLESHOOTING Circuit diagram related to swing holding brake solenoid 213 1...
Страница 179: ...PC130 7 20 331 TROUBLESHOOTING Circuit diagram related to 2 stage relief solenoid 215 1...
Страница 181: ...PC130 7 20 333 TROUBLESHOOTING Circuit diagram related to travel speed shifting solenoid 216 1...
Страница 183: ...PC130 7 20 335 TROUBLESHOOTING Circuit diagram related to model selection connector 217 1...
Страница 185: ...PC130 7 20 337 TROUBLESHOOTING Circuit diagram related to S NET 218 1...
Страница 189: ...PC130 7 20 341 TROUBLESHOOTING Circuit diagram related to pump pressure sensor 224 1...
Страница 191: ...PC130 7 20 343 TROUBLESHOOTING Circuit diagram related to sensor power supply 226 1...
Страница 193: ...PC130 7 20 345 TROUBLESHOOTING Circuit diagram related to engine speed sensor 227 1...
Страница 195: ...PC130 7 20 347 TROUBLESHOOTING Circuit diagram related to PC EPC solenoid 232 1...
Страница 197: ...PC130 7 20 349 TROUBLESHOOTING Circuit diagram related to PC EPC solenoid 233 1...
Страница 199: ...PC130 7 20 351 TROUBLESHOOTING Circuit diagram related to overload pressure sensor 251 1...
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Страница 203: ...PC130 7 20 355 TROUBLESHOOTING Circuit diagram related to governor motor and potentiometer 306 1...
Страница 205: ...PC130 7 20 357 TROUBLESHOOTING Circuit diagram related to fuel control dial 308 1...
Страница 207: ...PC130 7 20 359 TROUBLESHOOTING Circuit diagram related to battery relay 315 1...
Страница 209: ......
Страница 211: ...PC130 7 20 363 TROUBLESHOOTING Circuit diagram related to governor motor and potentiometer 317 1...
Страница 213: ...PC130 7 20 365 TROUBLESHOOTING Circuit diagram related to governor motor and potentiometer 318 1...
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Страница 223: ...PC130 7 20 409 TROUBLESHOOTING Circuit diagram related to governor motor and potentiometer BWP13362 E 2 1...
Страница 233: ...PC130 7 20 419 TROUBLESHOOTING Circuit diagram related to PPC lock solenoid E 8 1...
Страница 247: ...PC130 7 20 433 TROUBLESHOOTING Circuit diagram related to swing lock switch E 18 1...
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Страница 251: ...PC130 7 20 437 TROUBLESHOOTING Circuit diagram related to wiper motor and window rear limit switch E 20 1...
Страница 253: ...PC130 7 20 439 TROUBLESHOOTING Circuit diagram related to windshield washer motor E 20 1...
Страница 255: ...PC130 7 20 441 TROUBLESHOOTING Circuit diagram related to lower windshield wiper E 21 1...
Страница 257: ...PC130 7 20 443 TROUBLESHOOTING Circuit diagram related to caution buzzer stop switch E 22 1...
Страница 259: ...PC130 7 20 445 TROUBLESHOOTING Circuit diagram related to boom RAISE oil pressure switch E 23 1...
Страница 261: ...PC130 7 20 447 TROUBLESHOOTING Circuit diagram related to boom LOWER oil pressure switch E 24 1...
Страница 263: ...PC130 7 20 449 TROUBLESHOOTING Circuit diagram related to arm IN oil pressure switch E 25 1...
Страница 265: ...PC130 7 20 451 TROUBLESHOOTING Circuit diagram related to arm OUT oil pressure switch E 26 1...
Страница 267: ...PC130 7 20 453 TROUBLESHOOTING Circuit diagram related to bucket CURL oil pressure switch E 27 1...
Страница 269: ...PC130 7 20 455 TROUBLESHOOTING Circuit diagram related to bucket DUMP oil pressure switch E 28 1...
Страница 273: ...PC130 7 20 459 TROUBLESHOOTING Circuit diagram related to travel oil pressure switch and travel alarm E 30 1...
Страница 275: ...PC130 7 20 461 TROUBLESHOOTING Circuit diagram related to service 1 oil pressure switches front and rear E 31 1...
Страница 284: ...20 470 PC130 7 TROUBLESHOOTING Circuit diagram related to air conditioner E 32 1...
Страница 288: ...20 474 PC130 7 TROUBLESHOOTING Circuit diagram related to air conditioner E 32 1...
Страница 290: ...20 476 PC130 7 TROUBLESHOOTING Circuit diagram related to travel oil pressure switch and travel alarm E 33 1...
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Страница 294: ...20 504 PC130 7 TROUBLESHOOTING HYDRAULIC AND MECHANICAL SYSTEM DIAGRAM HYDRAULIC AND MECHANICAL SYSTEM DIAGRAM 1...
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