Check and judge whether the starter electromagnetic switch is good or bad. First, pull out the movable iron core and spring from the rear end, iron the solder on the electromagnetic switch box connector to disengage the electromagnetic switch coil connector, and then unscrew the fixing bolts of the switch box to separate the switch box from the coil shell,
Pull the switch shaft assembly part out of the iron block of the housing.
(1) Inspection of mechanical parts.
The cooperation between the movable iron core, the switch shaft and the coil housing shall ensure free movement. The contact surfaces inside the switch and on the shaft can be
Sand with metallographic sandpaper. If the candle has burned badly and stuck, it should be repaired or replaced.
The contact plate should be flat, the side roller should be flat, the shaft end spring should be intact, and the height of the two contacts in the switch box must be the same.
(2) Inspection of the electromagnetic switch coil.
The inspection of the electromagnetic switch coil usually includes: ① battery inspection method; ② multimeter inspection method.
1) Battery check method.
① Disconnect the wire of the starter field coil from the terminal "M" of the magnetic switch #, connect the 12V (or 24V, as required) battery between the terminal "S" and the terminal "M"" of the magnetic wire, and at the same time connect the The other wire of the negative pole of the battery is connected to the shell of the starter. After the power is turned on, the starter gear can be quickly pushed out to the working position, which indicates that the attracting coil of the electromagnetic switch is working well.
②Quickly disconnect the wire from the battery negative terminal to the electromagnetic switch terminal "M". If the starter's drive gear stays in the pushed out position, the hold coil is good.
Note: The above two tests should be completed in a short time to avoid burning out the coil.
2) Multimeter inspection method.
Take off the magnetic field coil wire on the electromagnetic switch terminal of the starter, connect the terminals "M" and "S" of the electromagnetic switch with the two probes of the multimeter, and detect their resistance values; then connect the multimeter to the terminals of the electromagnetic switch respectively "M" and "S" terminals (that is, the two ends of the holding coil), and check their resistance.
Fault diagnosis and inspection of starter electromagnetic switch 1. Hold Coil Fault
Fault performance:
When the starter's holding coil is open, shorted, or poorly grounded, the starter's drive gear periodically taps the flywheel.
Reason for failure:
The reason for this phenomenon is that when starting, the movable iron core is attracted by the attraction coil, so that the main contact pad is in contact with the two main terminals. However,
At the moment of contact, due to the de-energization of the attracting coil, the movable iron core remains stationary only under the action of the holding coil, but due to the force of the holding coil
fault, the movable iron core is retracted under the action of the return spring, which separates the main contact pad from the two main terminals, and the DC motor is de-energized. same
, the attraction coil is energized again to attract the movable iron core to the position where the main contact pad contacts the two main terminals. At the moment of contact, suck
The lead coil will be de-energized again, which will separate the main contact pads. If this is repeated, there will be a sound of "clicking, clicking". 2. Suction coil failureGrass
If the attraction coil breaks down, the active iron core cannot be attracted by the holding coil when starting. When starting, if it is a starting circuit with a starting relay, only the click sound of the starting relay contact is heard, but the starter does not operate. Of course, this kind of failure is based on the premise of eliminating battery failure.
The reason for this phenomenon is that when starting, the movable iron core is attracted by the attraction coil, so that the main contact pad is in contact with the two main terminals. However,
At the moment of contact, due to the de-energization of the attracting coil, the movable iron core remains stationary only under the action of the holding coil, but due to the force of the holding coil
fault, the movable iron core is retracted under the action of the return spring, which separates the main contact pad from the two main terminals, and the DC motor is de-energized. same
, the attraction coil is energized again to attract the movable iron core to the position where the main contact pad contacts the two main terminals. At the moment of contact, suck
The lead coil will be de-energized again, which will separate the main contact pads. If this is repeated, there will be a sound of "clicking, clicking". 2. Suction coil faulty.
If the attraction coil breaks down, the active iron core cannot be attracted by the holding coil when starting. When starting, if it is a starting circuit with a starting relay, only the click sound of the starting relay contact is heard, but the starter does not operate. Of course, this kind of failure is based on the premise of eliminating battery failure.
(From: Pacific Automotive Network)