Carter Excavator Repair
Carter 320bl excavator engine fails to start, oil pressure alarm
Symptom: The engine of the Carter 320BL excavator cannot be started. What is the key within a few seconds after the oil pressure alarm appears? Troubleshooting: Engine room wiring harness TREM-A (terminal A) 1 # and 3 # pin short-circuit fault repair method: repair wiring harness. Excavator maintenance is the use of a bucket to dig materials above or below the bearing surface and load them into a transport vehicle or earthmoving machinery to a dump. Excavator repairs The materials excavated by the excavator are mainly soil, coal, silt, and pre-loose soil and rock. Judging from the development of construction machinery in recent years, the development of excavators is relatively fast. Excavators have become one of the most important construction machinery in engineering construction.
The engine of the Carter 320BL excavator cannot be started, and the oil pressure alarm malfunction is detected: 1. Look at the above phenomenon of KEY-ON, then it is determined that the generator L terminal is abnormal, and the multimeter large 24V- is used as the terminal voltage measurement is abnormal. 2. The cab is disconnected from the male connector 1. Use a multimeter to connect the connector from # 1-36 (generator terminal L) to the other end of each continuity. 3. After measurement other than the driver of the electrical wiring connector, the short circuit is not found with other conductors. As shown in FIG. 4, in the cab harness connector after the measurement, a short circuit between the terminal and the terminal # 1-35 was found, indicating that a short circuit occurred inside the cab. 5. The analysis system inside the cab of Figure 1, and the two terminals monitor and enter ICF to distinguish between "component" or "harness" short. After disconnecting ICF and the monitor again, the short circuit still occurs, then Determine that the wiring harness is shorted internally. 6. The wiring harness was inspected carefully, and it was found to be mountain jute between # 1 and # 中 3 short-circuit terminals.
Note: 1. The 1 × terminal of the Trema connector in the cab harness is connected to the power-on signal via an 18 × fuse. 2. The 3 × terminal of the Trema connector in the cab harness is connected to the L terminal of the generator, the R terminal of the start safety relay and the C7 terminal of the monitor. three. When the two terminals are short-circuited, the power goes from the 18 × fuse to the R terminal of the starting safety relay when the key is turned on, so the starting safety relay remains open, and the engine cannot start without closing. four. When the monitor's C7 terminal is energized, the monitor assumes that the engine has started running, that is, it starts to monitor the oil pressure. If it is detected that the oil pressure is still low after a few seconds, it will alarm the oil pressure. 5. The fault occurred on a machine using a 5-pin safety start relay. This phenomenon may differ on machines using 4-pin starter relays, which requires confirmation.