How to Assemble a Makita 2450 Rotary Hammer
Hammers are called percussion drilling devices designed for drilling and chiselling holes in particularly durable materials.
Two ideas are implemented in the puncher: the working tool rotates and simultaneously moves in the longitudinal direction, creating a shock pulse.
Hammers always work in extreme conditions.
The duration of the drill depends not only on the correct operating conditions, but also on the reliability of the parts included in the product.
But no matter how hard you try, over time, punchers begin to fail.
To properly repair the hammer, you need to familiarize yourself with its device.
Repairing a Makita 2470 and 2450 punch with your own hands can be done by a person who has the skills of a locksmith and knows the basics of electrical engineering.
Remember! Observe safety precautions and unplug the machine when disassembling.
Makita 2450 and 2470 rotary hammers are assembled in almost the same way and from the same parts. Repairing them is no different.
For ease of repair, the assembly diagram and catalog of parts for Makita rotary hammers are given below.
The mechanical part provides the transmission of torque to the drill-drill, creating at the same time a translational movement that creates a shock.
The mechanical part consists of a rotation drive and a percussion mechanism.
The electrical circuit of the Makita rotary hammer provides the conversion of electrical energy into kinetic energy through the rotation of the rotor. The electric part includes an electric motor, a power button with a speed controller, a reverse switch, connecting wires.
In this article, we consider all the malfunctions of the electrical part of the Makita 2470 and 2450 rotary hammers and how to solve them:
Electrical failures of the Makita 2450 and Makita 2470 rotary hammers
Electrical malfunctions are manifested in the fact that when the punch is connected to the mains voltage, the tool does not turn on.
The Makita rotary hammer wiring diagram is simple.
Through the connecting cord, pos. 72, a 220 V supply voltage is supplied through the switch pos. 68 and electric brushes through the brush holder pos. 66 to the lamellas of the electric motor rotor pos. 54, and through the contacts of the reverse switch pos. 60 to the stator winding pos. 59.
The most common malfunction is the lack of contacts in the connections.
The procedure for determining electrical faults
Determination of the integrity of the electrical part of the Makita rock drill. In order to repair a Makita 2450 or Makita 2470 punch with your own hands, you need to arm yourself with devices and tools. Any tester, a set of screwdrivers, wrenches, a hammer, a wooden extension will do. It is good to have a screwdriver with a built-in phase indicator.
You need to take the tester, connect to the ends of the punch plug and press the punch switch. If the tester shows some resistance, then the power supply circuit of the punch is intact.
Video: How to Assemble a Makita 2450 Rotary Hammer
The back cover (usually black) of the punch is easy to remove, you just need to unscrew the three screws with a screwdriver or screwdriver.
Remove the cover and use a screwdriver to disconnect the ends of the wires from the electric brushes.
Using a tester or a home-made device, popularly referred to as the "arch", determine the integrity of the lead wires and the correct operation of the switch.
A few words about a simple control device called "arcade". The device consists of an LED or a light from a flashlight, a finger-type battery and two pieces of wire. The entire electrical circuit of the control device is a series-connected parts. Connect the battery with one end of the LED or light bulb, connect the wires to the free ends of the LED and the battery. You will get a universal device for checking the integrity of electrical circuits.
Typical malfunctions of the Makita 2450 and 2470 rotary hammer
Common failures in the electrical part of the Makita 2450 and Makita 2470 rotary hammer:
- fracture of the supply cable at the entrance to the perforator;
- failure of the TG813TLB-1 switch button, art.650508-0, pos. 68.;
- wear of electric carbon brushes SV-419, art.191962-4, pos.65;
- wear of reverse switch contacts;
- wear of rotor bearings: bearing 609LLU, art.210060-6, item 51; bearing 607LLU, art.211021-9, item 56;
- short circuit of a rotor 220-240 V, art.515668-8, item 54;
- failure of the stator winding 220-240 V for HR2450, art.633488-5, pos. 59.
As a start button, the TG813TLB-1 switch, art.650508-0; pos. 68.
Replacing the brushes is done when they are completely abraded or poorly contacted. This malfunction is detected by strong heating of the points of installation of the electric brushes.
Failure to turn on the punch can be caused by abrasion of contacts on the reverse switch.
It eliminates such a malfunction very simply.
Makita rotary hammer reverser repair
To repair the reverse switch, the back cover must be disconnected. Carefully disconnect the wires from the button. Carefully inspect the switch.
Further disassembly consists in removing the brush holder, having previously released the brushes themselves.
Removing the brush holder, you will get to the contacts of the reverse switch.
Determine its condition, replace the contacts if necessary.
Another common electrical fault is poor contact between the stator and the lower contacts of the reverse switch.
Repair contact between stator and reverse switch
To remove the stator, it is necessary to disconnect the gear housing (black) from the stator housing (green).
Remember! In the mechanical part of the rotor, the bearing is pressed by a special ring. When disassembling, do not lose it.
The stator is located in the green case. Looking in the middle, you will see two self-tapping screws 4 × 60, art. 266334-3, pos. 57, securing the stator to the housing. Unscrew them, remove the plastic stator protector for HR2450, art. 419201-3, pos. 58., Release the stator.
When you get the stator, you will see the contacts on the stator and the reverse switch panel.
The assembly of the electric part of the hammer is in the reverse order.
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