KAMAZ starter: description, device, types and reviews

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:41

To start the engine, it must be started. For this, a starter is provided in the car device. KamAZ Euro-3 is also equipped with it. The mechanism is of different types. Well, let's look at how the KamAZ starter works, how it works and what technical characteristics it has.

Varieties

There are several types of these mechanisms:

• Reduced.
• Gearless.

KAMAZ starter refers to the first type of device. This mechanism is the most powerful, since here the transmission of torque from the armature to the gear is carried out by the gearbox. Such starters have not only high power, but also good starting torque. They also have a long service life. These types of starters are used in 90 percent of modern cars.

As for gearless elements, they work as follows. After voltage is applied to the electromagnetic switch, the Bendix gear moves and engages the flywheel ring. The current goes to the armature. There is a rotation. Gear and shaft matchedthanks to the freewheel. After a successful start of the engine, this connection is loosened. The current supply is stopped and the gear returns to its original position. Due to low efficiency and low maintainability, gearless elements are practically not used in the automotive industry.

Device

Structurally, the KamAZ starter is an electric motor with a traction relay and a mechanical drive. This mechanism is installed on the flywheel housing (located on the left side of the engine). It is mounted on three bolts with studs.

The movement is based on a 4-pole series-wound motor. The starter design also includes the following elements:

• Drive shaft.
• Anchor.
• Back and front cover.
• Collector.
• Brush knot.
• KamAZ starter solenoid relay.
• Excitation winding.

All this is combined in a metal case. Externally, the KamAZ starter looks like the one shown in the photo below.

The body is made of mild steel. It serves as a magnetic circuit where the cores are attached. The body is closed with lids. The back hides the brush assembly. Front - drive mechanism. The excitation winding is divided into parallel branches, which use series-connected coils. A copper wire with a rectangular cross section is used as a winding. One end is connected to the positive brushes, and the other end is connected to the insulated terminal of the housing.

All coils are impregnated with a special varnish and additionally braided with cotton tape. The turns are insulated with cable paper.

Anchor

As for the anchor, it includes the following elements:

• Shaft with corrector.
• Wrapping.
• Core.

The latter is made from sheets of electrical steel. The manifold is designed to maintain constant torque. Winding - wave type. 2 wires are laid in the grooves with a core.

Moreover, their coils are isolated from the core. The end of the wires fits into the slot of the copper collector plate and soldered.

Brushes

This assembly supplies voltage to the collector plates. Brush holders are a dielectric clip with metal inserts. The latter are inside the brushes. The contacts are welded to the pole plates by spot welding. This element is the tail part of the excitation winding. The brushes themselves are made from an alloy of lead, copper and graphite. Additionally, tin is added to the composition. This alloy prevents voltage drop in the winding and reduces collector wear.

How it works

After turning the ignition key, voltage is supplied to the additional (RS-530) starter relay. KamAZ is still standing still. After the voltage exceeds the bar of 8 V, the traction relay is activated.

Mechanism forcibly connects the gearflywheel gear drive. Also at this time, the starter power contacts are closed. The anchor starts to spin. Torque is transmitted to the flywheel. After the engine starts, the gear automatically disengages.

Specifications

Starter St-142b is installed on KamAZ trucks. It has the following characteristics:

• Voltage - 24 Volts.
• Rated power - 7.7 kW or 10.5 horsepower.
• Voltage to turn on the solenoid relay - 8 volts.
• Brush spring pressure - 2 kgf.
• The height of the brushes is 19-20 millimeters.
• Current – 130 Amps.
• Rotations of the armature at idle - 5, 5 thousand per minute.

Starter (KAMAZ): price

There are plenty of both new and remanufactured starters on the market.

What is the price for a starter (KamAZ)? The St-142b brand device can be purchased at a price of 4.5 to 13 thousand rubles.

Faults and starter repairs

KamAZ is a very maintainable truck. In the event of a malfunction, you can fix the breakdown yourself. Consider typical problems with the St-142b starter:

1. When the ignition is turned on, the device does not work. In this case, it is necessary to check the winding of the traction relay. A short circuit or open circuit may have occurred. Depending on the nature of the breakdown, it is necessary to replace the retractor. Also, the cause of breakdowns can be the lack of contact between the brushes and the collector. In this casecheck the pressure of the brush springs. If it is less than 1.8 kgf, the element is replaced with a new one.
2. The traction relay does not work. It is necessary to check the winding of the additional relay and make sure that the retracting winding is intact. They also check the reliability of the contact in the circuit and all connections.
3. When the starter is turned on, characteristic clicks of the additional relay appear. The drive gear is stuck on the flywheel ring. Perhaps the reason is hidden in the incorrectly configured moment of closing the contacts of the traction relay. How to fix it? The gap is set between the gear and the thrust washer. Next, check the operation of the mechanism. If the symptoms recur, the end of the starter drive or the teeth of the flywheel crown may have been clogged. There are several ways to troubleshoot. The first is to restore the teeth with surfacing. The second is to replace the flywheel crown or drive gear. The third method involves cleaning the irregularities on the teeth.
4. During operation, the armature rotates, but does not interact with the flywheel. The crankshaft does not rotate. In this situation, it is required to check the integrity of the flywheel teeth, as well as the drive gear. The starter is also re-adjusted.

Conclusion

So, we found out what the KamAZ starter is, what technical characteristics and malfunctions it has. As you can see, this is a very complex mechanism. If a malfunction (or just symptoms) occurs, urgent repairs are required. Otherwise, you will not be able to start the engine.