After the excavator was working on the construction site for a day, the next morning when preparing for the construction work in advance, I found that the starter did not turn on, and there was no reason for it in appearance. Due to the tight schedule, the owner contacted the excavator as soon as possible. Repairman. The maintenance staff arrived on the spot for a simple observation and inspection. The starter was already damaged. The excavator repair master carried out an on-site inspection of the starter of the excavator.
Diagnose the starter does not start fault
situation:
(1) When the ignition switch is connected, the starter does not turn;
(2) The drive gear on the starter is not engaged;
(3) The drive gear on the starter is not loose;
(4) The starting speed ratio of the diesel engine is insufficient, and the rotation is uneven;
reason:
(1) The storage battery is significantly insufficiently charged;
(2) The battery connector is loose;
(3) The battery wire connector is loose;
(4) The starting power circuit is blocked;
(5) The armature of the electromagnetic relay is stuck;
(6) The starter itself fails;
(7) The drive gear of the starter is stuck with the flywheel ring gear of the diesel engine;
(8) Adhesion of starter drive gear and rolling bearing;
(9) The starter does not drive the diesel engine;
(10) The diesel engine is malfunctioning.
Clear method:
(1) Check whether the battery is fully charged. If it is true that the battery is not sufficiently charged, take out the battery and charge it; remove and replace the battery when necessary;
(2) Connect the battery terminal and connector;
(3) Repair the battery wire connector;
(4) Check the starting power circuit to make the starter terminal block have fire;
(5) Check the electromagnetic relay of the starter and clear the fault of the electromagnetic relay; when starting, you should also hear the sound of electromagnetic relay closing and breaking;
(6) Check and repair the starter;
(7) Restart, so that the starter drive gear and the engine flywheel change transmission gear part mesh;
(8) Repair the rolling bearing of the starter bearing end cover;
(9) The torque of the starter is insufficient, and the starter should be replaced when necessary;
(10) Maintain the diesel engine and make the diesel engine operate at all normal loads.
Conclusion: You must be careful and careful when clearing faults, and you cannot ignore the faults at the key point level. Some easy-to-understand faults are usually very easy to be ignored during the inspection! In addition, if your own work experience in overhaul, disassembly and assembly is not very colorful, it is recommended that everyone should find a technical professional overhaul teacher to prevent other components from being destroyed due to disassembly and assembly.
