As we all know, the road conditions on the domestic construction site are extremely complex. Excavators often need to climb down the pit and encounter roads with large slopes and muddy slips. So, what is the reason why the excavator is weak in its movement? What should I do when the swinging arm of the excavator does not reach the arm and the climbing is weak? This article describes the maintenance of Komatsu excavator's powerless failure.
Specific details: Komatsu PC850-8 excavator starts walking, or excavating action, the machine is weak. The excavator's weakness is not just walking and digging. It has no power to turn, raise arms, retract arms, or climb hills. The weakness has been happening for more than a week.
Analyze the reasons:
Caused the Kunming Komatsu PC850-8 excavator to rotate, raising the arm and closing the arm to climb was weak
1. Excavator throttle switch works badly.
2. Komatsu excavator engine load reduction operation.
3. Digging mechanical and electrical subsystem failure.
4. The battery power of the excavator is low or the ECM line is grounded.
5. Komatsu excavator injection driving pressure is too low.
6. The fuel system of the excavator is faulty and the fuel supply is insufficient.
malfunction repair:
1. On-site test run at the construction site, the working device is weak. After the failure, observe whether there is a prompt on the display that the engine is running at reduced load? [No]
2. Verify that the throttle switch is working properly? [Normal] Check whether the wiring of ECM70 pin connector, injector connector and camshaft position sensor connector is installed correctly? [Correct]
3. Check whether the power connector of ECM is loose? Is there any grounding in the line? [All normal] Check the fuel configuration, rated fuel limit value and FRC fuel limit value, and find that the rated fuel limit value is smaller than the specified value.
4. Adjust the rated fuel limit value, start the test run, Komatsu PC850-8 excavator rotates, the boom is raised and the arm is climbing. The failure phenomenon disappears.
