An excavator owner in Yunnan Province was very distressed. After working on the construction site for a day with his excavator, he found that the starter did not turn on when he prepared the construction work in advance the next morning, and the appearance was not obvious. Why, due to the tight schedule, the owner contacted the excavator repairman the first time. The maintenance staff arrived on the spot for a simple inspection and inspection. The starter was already damaged. The excavator repair master carried out an on-site inspection of the excavator starter.
Diagnosis of starter failure
situation:
(1) Connect the ignition switch, the starter does not turn;
(2) The driving 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 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 between the starter drive gear and the 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 confirmed that the battery is not sufficiently charged, take out the battery and charge it; replace the battery when necessary;
(2) Connect the battery terminal and connector;
(3) Repair the battery wire connector;
(4) Check the starting power supply circuit to make fire on the starter terminal block;
(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, make the starter drive gear mesh with the engine flywheel transmission gear;
(8) Repair the rolling bearing of the starter bearing end cover of the starter;
(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 critical 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.
