A sudden stop of a power tool in the middle of a work or a noticeable drop in power often signals the need for serious diagnostics. Disassembly of the screwdriver engine is a procedure that requires accuracy, understanding Construction of the electromechanical part and having a minimum set of tools. Many owners immediately carry the tool into the service, but self-maintenance can save significant funds and prolong your life. power-tool.
Before you start dismantling, you need to make sure that the problem is in the engine, not the battery or the start button. collector If you have sparkling, the smell of burning, the heating of the body, or the complete lack of response to the trigger pressing when the battery is charged, in this article we will discuss in detail the process of removing and inspecting the engine so that you can perform a quality inspection of the nodes.
It is worth noting that the design of different models can vary significantly depending on the manufacturer and class of tools. Professional models often have more complex attachment and dust protection system, while household options are built with the expectation of ease of maintenance. Understanding these nuances will help to avoid breakage of plastic latches and damage to internal connections when opening the case.
Workplace preparation and necessary tools
You don't need a clean, well-lit table that doesn't interfere with small parts, and you need to pay special attention to lighting, because the internal components of the engine are small, and poor light can lead to loss of important elements or errors in assembly.
To work, you will need the following set of tools:
- 🔧 A set of screwdrivers with cross and flat slits of different sizes for unscrewing the screws of the body.
- 🔨 Plastic blade or mediator for gently opening latches without damaging the plastic.
- 🧲 Magnetic tray or container with cells for sorting screws and small parts.
- 🧼 A brush with hard bristles and a solvent for cleaning the insides from coal dust.
Before any work begins, it is imperative to remove the battery, and even if the tool is turned off, there may be a residual charge in the circuit that can cause a short circuit in the event of accidental contact of wires, a basic safety rule that can result in electronic failure or injury if you ignore it.
⚠️ Warning: Never use metal screwdrivers to tuck the case near electronic boards, as this can damage tracks or accidentally close contacts.
If your screwdriver has warranty seals on the screws, opening them will automatically void the warranty. Make sure that the warranty service period has expired before starting dismantling. Otherwise, it is better to contact the manufacturer's authorized service center.
Sequence of dismantling of the body and removal of the engine
The process of removing the engine begins with the dismantling of the main body of the screwdriver, which usually consists of two halves connected by screws and plastic latches, screws can be located not only in obvious places, but also hidden under rubber linings, stickers or inside the handle, a close inspection from all sides will help to find all the attachment points.
Once you unscrew all the visible screws, you should carefully separate the halves of the body. Don't use excessive force: if the plastic doesn't diverge, then there's an unscrewed part or there's no hidden latch that's cracked. Use a plastic blade to walk around the perimeter of the seam and release the locks.
Inside the case, you'll see the main control board, the start button, and the engine itself, which is often attached to a special glass or guides. The engine can be connected to the gearbox directly or through an intermediate coupling. Removing the motor often requires removing the on button, which is fixed by grooves or additional screws.
☑️ Checklist before motor extraction
When disconnecting the wires from a button or motor, it is strongly recommended to take photos of the connections, which will help to correctly restore the circuit when reassembled, since the color marking of the wires from different manufacturers may differ, remember or write down which wire was connected to where to avoid errors.
Disassembly of the electric motor: anchor, stator and brushes
Once the engine is removed from the screwdriver body, it can be disassembled directly. The collector motor consists of several key components: a permanent magnet housing (stator), a rotating part with a winding (anchor or rotor), and a brush assembly. Disassembly begins with the removal of brushholders, which are usually located on the sides of the engine body.
To access the anchor, you need to loosen or twist the screws that tighten the long hairpins of the body, or unclog the metal brackets if the design allows. Once the front lid with the bearing is removed, the anchor can be carefully removed. Be careful: gears or locking rings can be installed on the shaft, which are easy to lose.
The main elements that require inspection (inspection):
- 🔍 Brushes: graphite bars transmitting current to the collector; they shall not be shorter than 3-4 mm.
- 🔍 The collector: copper plates at anchor; they shall be clean, free of scorching and deep furrows.
- 🔍 Bearings: should rotate smoothly, without backlash and characteristic hum.
- 🔍 Winding: copper wires shall not show any trace of overheating, blackening or melting of the varnish.
Often the cause of failure is the wear of brushes or pollution of the collector with coal dust. If brushes are worn, they must be replaced with new, preferably original or high-quality analogues. Buying a new anchor or rewinding the engine is often economically impractical for inexpensive screwdriver models.
Why do the brushes sparkle?
Not only can brushes glow from wear, but they can also be caused by sewage contamination, by interturning at anchor, or by loosening the brush springs. Light sparkling is normal, but a strong blue flame indicates a problem.
Diagnosis of malfunctions and symptom table
Proper diagnosis can determine the exact cause of a tool failure without buying spare parts. Visual inspection and simple multimeter tests can detect 90% of all possible electrical failures. It is important to be able to distinguish between symptoms of mechanical wear and electrical breakdown.
Below is a table that will help you compare the observed symptoms with the likely causes:
| A symptom. | Probable cause | Method of decision |
|---|---|---|
| Screwover hums, but doesn't twist | Jamming of gearbox or anchor | Disassembly of gearbox, lubrication, bearing inspection |
| Strong sparkling and the smell of burning | Wear of brushes or anchor closure | Replacement of brushes, cleaning of the collector, vertebrae of the anchor |
| The engine is running in jerks. | Poor contact in the chain or wear of the collector | Wire check, collector grinding |
| Tool is not switched on | A faulty button or chain break | Replacement of the start button, check the integrity of the wires |
If you want to check the anchor for turn-on, you can use a special device or just look carefully at the slats of the collector, blackening of one or more plates, and traces of melting of the winding insulation indicate a malfunction, in which case the engine is easier to replace the whole than to try to repair.
⚠️ Warning: If you feel magnetically stuck at certain points when you scroll the anchor with your hand, this may indicate damage to the stator magnets or severe contamination, which requires careful cleaning or replacement of the body.
Cleaning, maintenance and assembly of nodes
After troubleshooting and troubleshooting, the internal nodes must be cleaned completely. The coal dust produced by brushes is an excellent conductor and can cause short circuits. Use compressed air or a soft brush to remove contaminants from hard-to-reach areas.
Anchor bearings are recommended to be lubricated with a special lubricant for high rotational speeds. Do not use conventional lithium lubricants, as they can dry or leak when heated. Molybdenum disulfide formulations or special oils for power tools are ideal for lubrication.
The engine is assembled in reverse order. It is important to install the brushes correctly: they should be free to walk in the brush holder, but not hang around. The springs should ensure that the graphite is tightly pressed against the collector. When you install the anchor, make sure that you do not damage the thin wires of the windings around the edge of the body.
Wipe the collector before assembly with a cotton swab dipped in alcohol or gasoline-kaloshes to remove fat traces and residues of old lubricant.
When tightening the engine body screws, keep the force uniform so as not to skew the bearing bushes. A tightening can cause the shaft to jam, and a tightening can cause vibration and noise when operating. After assembly, check the free rotation of the shaft with your hand: it should spin easily and silently.
Typical mistakes in disassembly and expert advice
Beginners often make mistakes that can turn a simple repair into a complete engine replacement. One of the most common problems is the loss of the locking rings or washers that are mounted on the anchor shaft, which are small details critical to fixing the gear and the rotor's correct position.
Another common mistake is to break the assembly sequence of the brush assembly. If the brushes are not removed by a special lock or thread during installation, they can break or damage the graphite surface. Always use a temporary stopper for the brushes until the engine cover is fully installed.
Key recommendations for successful repairs:
- 📸 Take photos at each stage of the disassembly, especially the location of the wires and gears.
- 🧹 Use only lilaless fabrics to wipe contacts and collector.
- 🔩 Do not use force when assembling: if parts do not fall into place, then something is assembled incorrectly.
The main secret of a screwdriver’s long life is regular cleaning of coal dust and timely replacement of brushes before they start scratching the collector.
If the tool is unstable after assembly, don't rush to disassemble it again. Let it work at idle speeds for a few minutes so that the brushes rub against the surface of the collector, a process called "break-in" and necessary to restore normal contact.
FAQ: Frequently asked questions
Can I replace the motor with a brushless one?
It's theoretically possible, but it requires a complete redesign of the electronics, a battery replacement for a more powerful one, and a redesign of the seats, which is neither practical nor cost-effective for home repairs.
How to lubricate the bearings of the screwdriver engine?
Use high-speed lubricants for power tools. A conventional solidol or lithol may not withstand high rpm (up to 30,000 rpm) and quickly lose its properties.
Why does the screwdriver sparkle more after replacing the brushes?
New brushes take time to grind. Increased sparkling in the first 10 to 15 minutes is normal. If sparking is not decreasing, check the cleanness of the collector and the tension of the springs.
Where can I find a diagram for my model?
Enter the tool model (e.g., Makita 6271D) to the search engine with the addition of the word “exploded view” or “parts diagram”. Official parts catalogues contain detailed drawings.