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August 12, 2017 18:08

How to Repair company Makita rotary hammer


  • 1 procedure for determining electrical faults
    • 1.1 Repair reverse switch punch Makita
    • 1.2 Repair of contact between the stator and the switch reversal

Hammers called percussion drilling devices designedfor drilling and chiseling holes in high-strength materials.In
punch implemented two ideas: a working tool rotates and simultaneously moves in the longitudinal direction, creating a shock pulse.

Hammers always work in extreme conditions.Running time
drills depends not only on the correct operating conditions, and reliability included in the product details.
But no matter how you tried, over time, the guns begin to fail.

To properly repair the punch, you must familiarize yourself with the device.

Repair punch Makita 2470 and 2450 with his own hands can accomplish a person with skills of a locksmith and knowing the basics of electrical engineering.
Remember!Compliance with safety regulations and turn off the punch from the network in the analysis.

Hammers Makita 2450 and 2470 collected almost the same pattern and from the same parts.Repairing them is no different.

For convenience, below is a repair assembly diagram and parts catalog Makita drills.
complete disassembly diagram punch Makita
Driving punch Makita 2450 and 2470 consists of the mechanical and electrical parts.
General view of the punch Makita

Mechanical transmits torque to the drill-borax, at the same time creating a progressive movement that creates blow.
The mechanical part consists of a rotation of the drive and impact mechanism.

Schematic diagram punch Makita converts electrical energy into kinetic energy through the rotor.The structure of the electrical part of the motor, the power button with a speed controller, reversing switch, connecting wires.
Total electric part 03
basic malfunctions perforator makita
Faults drills are divided into electrical and mechanical.

In this article, we consider all the faults electrical drills Makita 2470 and 2450 and their solutions:

Electrical malfunction drills Makita 2450 and Makita 2470
Electrical faults occur that when connecting the gun to the power supply, the instrument does not turn on.
Wiring punch Makita easy to network.
circuitry 02
Schematic diagram punch Makita 2450 is a serial connection of the motor, the start button and the wire.The scheme is similar to the perforator makita 2470.

After connecting cord poz.72 voltage 220 is supplied through poz.68 switch and the electric toothbrush by the brush holder on the slats poz.66 poz.54 rotor motor, and through contacts poz.60 reverse switch on the stator winding poz.59.
most common fault - the lack of contacts in the compounds.

procedure for determining electrical faults

Determining the integrity of the electric punch Makita.In order to perform repair or punch Makita 2450 Makita 2470 with their hands should be armed with tools and instruments.You can use any tester, a set of screwdrivers, wrenches, a hammer, a wooden nastavka.Good to have a screwdriver with a built-in phase indicator.

necessary to take the tester, connect the ends of the fork and punch press Punch switch.If the tester shows some resistance, then punch supply chain intact.
continuity Continuity
If the tester shows infinity, then the continuity is broken and need to remove the back cover to monitor the connecting cable and electric punch brushes.

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back cover (usually black) easily removed the gun, you just have to unscrew three screws using a screwdriver or a screwdriver.
Removing the trigger button

Remove the cover and use a screwdriver to disconnect the wire ends from electrobrushes.
With a tester or a homemade device called by the people "Arkady", determine the integrity of the leads and the correct operation of the circuit breaker.

few words on a simple control device called "Arkady".The device consists of an LED or light bulb from a flashlight, penlight batteries and two pieces of wire.The entire electrical circuit of the control device is series-connected parts.Connect the battery with one end of the LED or light bulb, the free ends of the LED and the battery, connect the wires.You will have a universal device for checking the integrity of the electrical circuits.

Typical faults punch Makita 2450 and 2470
Common fault in the electrical part and the punch Makita 2450 Makita 2470:

  • fracture of the supply cable in place at the entrance of the punch;
  • failure TG813TLB-button switch 1, art.650508-0, poz.68 .;
  • electrical carbon brushes wear SV-419, art.191962-4, poz.65;
  • wear contacts reverse switch;
  • wear rotor bearings: 609LLU bearing art.210060-6, poz.51;bearing 607LLU, art.211021-9, poz.56;
  • rotor short-circuit 220-240, art.515668-8, poz.54;
  • failure of the stator windings 220-240 to HR2450, art.633488-5, poz.59.

As the start button is used TG813TLB-1 switch art.650508-0;Pos.68.

Brushes can be changed when they are full attrition or poor contact.This fault is detected points places a strong heating electrobrushes installation.

Disclaimer inclusion punch can be caused by abrasion of the contacts on the reverse switch.
eliminated such a failure is very simple.
reverse flow

Repair reverse switch punch Makita

reverse switch for repairs necessary to disconnect the rear cover.Carefully disconnect the wires from the button.Inspect the switch.

Further disassembly is to remove the brush holder, after freeing themselves of the brush.
removing the brush holder, you get to reverse the switch contacts.
Determine his condition, replace if necessary.

Another, frequent electrical fault, bad contact between the stator and lower reverse switch contacts.

Repair of contact between the stator and the reversing switch

To remove the stator, it is necessary to disconnect the gearbox housing (black) from the stator housing (green).

Remember!The mechanical rotor bearing is pressed against a special ring.When disassembling, do not lose it.

The green body is placed a stator.Peering into the middle, you will see two self-tapping screws 4 × 60, art.266334-3, poz.57 securing the stator to the housing.Remove them, remove the plastic protection for the stator HR2450, art.419201-3, poz.58., Release the stator.
When you pull out the stator, see contacts on the stator and the reversing switch panel.
contacts between the stator and the reversing plate
Contacts thoroughly sanded, treated with solvents or alcohol.
Before assembly turn in contact so that they fit into each other.Lubricate the contacts with petroleum jelly thinly.

Assembling electrical punch in reverse order.