2023 Author: Philip Bishop | [email protected]. Last modified: 2023-08-25 07:54
- How to Repair or Replace Makita Rotary Hammer Brushes 2450 and 2470
- How to remove the electric brushes of the Makita perforator
- How to make your own brushes?
- Installation of brushes
- How to determine the integrity of the stator without disassembling the hammer
- How to remove the stator of the Makita 2450 and 2470 rotary hammer for accurate diagnosis and repair
- Installing and assembling a new rotor
All power tools begin to fail over time. Faults are divided into mechanical and electrical. The most common electrical faults are faults associated with the failure of the brushes. In second place: failure of the armature bearings. Less common are stator or rotor failures.
And how to correctly determine the malfunction of the stator, rotor of the Makita 2450 and 2070 perforator, replace the brushes? And here the circuit diagram of the Makita 2450, 2470 perforator will help us.
How to Repair or Replace Makita Rotary Hammer Brushes 2450 and 2470
The fact that it is required to replace the brushes of the perforator is indicated by increased sparking in the area of the rotor collector, a burning smell, heating of the brush holders.
In a new or refurbished hammer drill, the spark under the brushes is even, of constant length and there is no spark separation in a circle.
Wear of bearings, damage to the insulation of the rotor or stator is clearly indicated by a spark around the entire circle of the collector. The appearance of this kind of spark indicates burnout of the collector plates, failure of the rotor or stator.
How to remove the electric brushes of the Makita perforator
As a rule, it is recommended to change the brushes after 70 … 120 hours of power tool operation.
To replace the carbon brushes pos. 65, you need to get to them.
The back cover must be removed from the punch, it is attached with three self-tapping screws.
Disconnect the lead wires. Using a screwdriver, remove the latches on the brushes and release them.
Remember! During long-term operation of the tool, it is not allowed to reduce the length of the working part of the brushes from the nominal by 1/3 (about 8 mm).
When one brush is worn out, both must be replaced.
By the way, a fake can also work well if it is made of the correct material and strictly according to the drawings.
How to make your own brushes?
The cheapest way is to pick up electric brushes from other models of power tools by sharpening them to the desired size with an ordinary file. This is economical, but they will last less than the original ones. Alternatively, you can adjust the carbon rod of the battery or other elements.
You need to take the battery and pull out the central carbon electrode from it. The electrode must be sharpened with needle files to the required size of the old electric brush. (This is informational information and is not essential for use)
It is worth noting that the quality of graphite directly affects the service life and sparking.
After making sure that the brushes are worn out, pick up analogues.
Installation of brushes
Before inserting the brushes into place, it is necessary to clean the brush holders from carbon deposits. This is done with a rag soaked in solvent. It is preferable to remove carbon deposits in the form of particles obtained with intense sparking with a small file. The cleaned brush holders are installed in place, brushes are inserted into them and clamped with latches from above.
How to determine the integrity of the stator without disassembling the hammer
To determine the integrity of the stator, it is necessary to ring its windings, measure the resistance of the winding and the insulation resistance.
To measure the resistance of the winding of the Makita puncher, you need to connect one end of the tester to the freed brush holder, and the other to one of the ends of the plug. If the device does not show anything, change the other end of the plug. If the resistance is infinity, the stator is open and requires replacement or repair. Do not forget, you cannot do without a schematic diagram of the Makita 2450.2470 punch.
If some resistance is shown, then it is important to measure its exact value. As a rule, the resistance of the stator winding of the Makita-2450 perforator at a temperature of + 20 ° C is within 25 ohms.
To understand in more detail why arcing of the armature collector occurs and which brushes are better? The video will help you figure it out, at the end of the video review there are important tips for choosing brushes
How to remove the stator of the Makita 2450 and 2470 rotary hammer for accurate diagnosis and repair
To remove the stator pos. 59, you need to remove the brushes, unscrew the four screws securing the cover of the mechanical block. They are screwed into the end of the lid.
Pulling the black housing and the green in different directions will release the housing with the stator. The stator is fixed in a green housing.
To remove it, you need to remove the plastic gasket pos. 58 and knock on the end of the case with a wooden mallet or a bar. The stator will stick out by itself, it remains to pull it out, blow it off and check it completely.
If you have a short circuit tester, you can immediately check the stator for a short circuit. The device is called IK-32.
Procedure for checking the stator windings
For an accurate check, disconnect the two stator windings from each other along the electrical circuit. Check the resistances of each winding, they should be exactly the same. With a difference in resistance, a winding with a lower resistance is likely to have an interturn short circuit.
Checking the stator of the Makita 2470 and 2450 perforator with your own hands
Diagnostics of the armature, stator with a short circuit device and homemade
How to check the suitability of the rotor of the Makita perforator
Checking the suitability of the rotor in the Makita perforator begins with its dismantling from the body.
But first you need to do external research. If in the rotor a spark from the brushes on the collector covers the weight of the collector, if during operation the perforator does not develop speed and its power has dropped, this is the first sign of a rotor malfunction.
Removing the rotor from the housing
To remove the rotor from the housing, it is necessary to separate the black and green housing as in the case of removing the stator.
Having disconnected the stator housing, take the gear housing (black) in your right hand, and the rotor in your left and pull in different directions until they are completely disconnected. The rotor is held in the gearbox by friction of helical gears.
Inspect the rotor manifold carefully. There should be no brush scratches on it. The collector lamellas must be clean.
To check the integrity of the collector, you must use a short circuit detector. It is easiest to make a chain ring according to the schematic diagram of the Makita 2470.2450 perforator. By the way, you can make such a device yourself if you know how to communicate with a soldering iron.
If you are convinced of the rotor malfunction, then you can install a new one, or you can try to restore the failed one.
Installing and assembling a new rotor
Replacing the rotor does not require any special knowledge and can be done by any user.
The rotor is inserted into the mechanical block with a helical gear until tight.
Remember! It is very important to correctly install the bearing pos. 56 and rubber ring 10 pos. 77.
In the Makita 2450 perforator on the rotor from the collector side, the 607LLB bearing pos. 56 or the domestic analogue 80017 is used, and the 609LLU bearing pos.51 or the analogue 80019 is installed on the impeller side, pos. 53.
Having installed the rotor, closing it with a case, put the electric brushes in place and check the operation of the puncher.
Everything! You have coped with a difficult task. The puncher is working.
Making brushes with your own hands for the Makita 2450 perforator. Options for how you can replace the electric brushes if necessary. Ways of fixing the contact wire
Instructions for rewinding the punch rotor. The procedure for winding the impregnation of the rotor of the perforator. What impregnations are used How best to impregnate a self-wound anchor
Instructions for assembling the punch Makita 2450 and 2470. The order of maintenance, lubrication and assembly of the percussion mechanism unit, intermediate shaft. Checking the performance of the punch
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