Contents
- 1 Procedure for the determination of electrical faults
- 1.1 Repair of the reverser switch Makita
- 1.2 Repair of contact between the stator and the reverser switch
Drilling machines are called impact drilling devices designed for drilling and slotting holes in extra strong materials.
Two ideas are realized in the puncher: the working tool rotates and simultaneously moves in the longitudinal direction, creating a shock impulse.
Rotary hammers always work under extreme conditions.
The duration of the perforators depends not only on the correct operating conditions, but also on the reliability of the parts entering the product.
But no matter how hard you try, the perforators start to fail with time.
To properly repair the puncher, you need to familiarize yourself with its device.
Repair of the Makita 2470 and 2450 can be performed by a person who has the skills of a locksmith and knows the basics of electrical engineering.
Makita perforators 2450 and 2470 are assembled in almost the same way and from the same parts. Repair them is no different.
For ease of repair, the following is the assembly diagram and catalog of Makita's perforator parts.
Scheme of the Makita 2450 and 2470 perforator consists of a mechanical and an electrical part.
The mechanical part provides the transmission of the torque to the drill-bit, creating simultaneous translational movement, creating a shock.
The mechanical part consists of a rotation drive and a shock mechanism.
The electric circuit of Makita's perforator provides conversion of electrical energy into kinetic energy through rotation of the rotor. The electric part includes the electric motor, the power button with a speed regulator, the reverse switch, connecting wires.
Basic malfunctions of the perforator makita
Malfunctions of the gun are divided into electrical and mechanical.
In this article, we will consider all the malfunctions of the electric part of the Makita 2470 and 2450 guns and how to solve them:
Electric malfunctions of the Makita 2450 guns and the Makita 2470
Electrical malfunctions are manifested in the fact that when the punch is connected to the mains voltage, the tool does not turn on.
The scheme of connecting the Makita perforator to the network is simple.
The electric circuit of the Makita 2450 is a series connection of the motor, start and wire buttons. The layout of the makita 2470 is similar.
Via the connecting cord pos.72, the supply voltage of 220 V is supplied through the switch pos.68 and electric brushes through the brush holder pos.66 on the rotor slots of the electric motor pos. 54, and through the contacts of the reverse switch pos. 60 to the stator winding pos.59.
The most frequent malfunction is the absence of contacts in the connections.
Procedure for the determination of electrical faults
Determination of the integrity of the electric part of the Makita perforator. In order to perform repair of the Makita 2450 or Makita 2470 perforator with your own hands it is necessary to arm with instruments and tools. Any tester, a set of screwdrivers, keys, a hammer, a wooden board will do. It is good to have a screwdriver with an integrated phase indicator.
It is necessary to take the tester, connect to the ends of the fork of the punch and press the puncher switch. If the tester shows some resistance, then the power circuit of the puncher is intact.
If the tester shows infinity, the continuity of the circuit is broken and you need to remove the back cover to monitor the connecting cable and the electric guns of the punch.
The back cover( usually black) of the gun is removed easily, you just need to unscrew the three screws using a screwdriver or a screwdriver.
Remove the cover and use a screwdriver to disconnect the ends of the wires from the power brushes.
Using a tester or a self-made device, called the "arcade" in the people, determine the integrity of the lead wires and the correct operation of the switch.
A few words about a simple control device called "arch".The device consists of a light-emitting diode or a bulb from a pocket flashlight, a finger battery and two pieces of wire. The entire electrical circuit of the monitoring device is a series-connected part. Connect the battery to one end of the LED or bulb, attach 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
Frequent faults in the electric part of the Makita 2450 and Makita 2470:
- fracture of the supply cable at the entrance to the puncher;
- breakdown of the switch button TG813TLB-1, art.650508-0, pos.68;
- wear of electric carbon brushes СВ-419, арт.191962-4, pos.65;
- wear of reverse switch contacts;
- wear of rotor bearings: bearing 609LLU, art.210060-6, pos.51;bearing 607LLU, art.211021-9, pos.56;
- short circuit of the rotor 220-240 V, art. 515668-8, pos.54;
- stator winding failure 220-240 V for HR2450, art. 633488-5, pos.59.
The switch TG813TLB-1, art.650508-0 is used as the start button;Pos.68.
Replacement of brushes is made at their full attrition or bad contact. This fault 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 the contacts on the reverse switch.
This troubleshooting is very simple.
Repair of the reverser switch Makita
To repair the reverse switch, disconnect the rear cover. Carefully detach the wires from the button. Carefully inspect the switch.
Further disassembly is the removal of the brush holder, first releasing the brushes themselves.
After removing the brush holder, you will reach the contacts of the reverse switch.
Determine its condition, replace the contacts if necessary.
Another common electrical fault, poor contact between the stator and the bottom contacts of the reverse switch.
Repairing the contact between the stator and the reversing switch
To remove the stator, it is necessary to detach the gearbox housing( black) from the stator housing( green).
Remember! In the mechanical part of the rotor, the bearing is pressed by a special ringlet. When disassembling, do not lose it.
The stator is located in the green housing. Looking in the middle, you will see two self-tapping screws 4 × 60, art.266334-3, pos.57, securing the stator to the body. Unscrew them, remove the plastic stator protection for HR2450, art.419201-3, pos.58., Free the stator.
When you take out the stator, you will see the contacts on the stator and the switch panel of the reverse.
The contacts must be carefully sanded with sandpaper, treated with solvent or alcohol.
Before assembling, bend the contacts so that they fit tightly into each other. Lubricate the contacts with technical petroleum jelly.
Assembly of the electrical part of the gun is in the reverse order.
