How to assemble the gearbox of a Makita rotary hammer

Gear lubricant for a Makita 2450

Welcome to my website! This article is about lubrication. Operating this tool is not only a matter of taking it lightly. You absolutely must lubricate the gearbox and chuck periodically.

Of course the gearbox comes already lubricated from the factory. But over time, the grease leaks somewhere and dries out somewhere. It is also designed to reduce friction only, not eliminate it. So one way or another, the parts still rub against each other, resulting in the formation of fine metal dust, which remains in the grease.

assemble, gearbox, makita, rotary

As a result of this mixing of metal and lubricant, the properties of the latter are gradually lost and the wear of parts accelerates.

Inexpensive Chinese peorators may also be poorly lubricated at the factory. Experienced masters of service centers recommend that after the purchase of even a new such machine immediately disassemble it and lubricate

The chuck comes dry from the factory. Here, actually, it is not the chuck itself that is oilyed completely, but only the part of it that is in contact with the auger, because this is where the strong friction occurs and without reducing it both the chuck and the auger shank could be damaged.

Thus, below we consider how and what to lubricate these elements. It will be considered peorator SDS with the horizontal motor location, as it is used by home masters in the vast majority of cases, and the article is mainly written for them.

Repair of a Makita 2450 with your own hands instruction

Peorator is a percussive drilling device designed for drilling and chiselling holes in particularly durable materials. Two ideas in the peorator: the working tool rotates and simultaneously moves longitudinally, creating a percussive impulse. The orators always work under extreme conditions. Their longevity depends not only on operating conditions, but also on the reliability of the constituent parts. But no matter how hard you try, over time the orators keep failing.

Hammer drill Makita HR2470 fix mechanical problem

In order to properly repair a torch, you need to be familiar with its construction.

A mechanic with a basic knowledge of electrical engineering can perform repairs on a Makita 2470 and 2450 with his or her own hands. Remember! Follow the safety instructions and unplug the unit during disassembly.

The Makita 2450 and 2470 are assembled in much the same way and with the same parts. Repair is no different. For your convenience, here’s an assembly diagram and parts catalog for your Makita torches.

The circuitry of a Makita 2450 and 2470 is made up of mechanical and electrical parts.

The mechanical part provides the transmission of torque to the drill bit, creating at the same time a translational motion that creates the impact. The mechanical part consists of the rotary drive and the percussion mechanism.

The electrical circuitry of a Makita is designed to convert electrical energy into kinetic energy through the rotation of the rotor.

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The electric part includes the electric motor, the starting button with the speed regulator, the reversing switch, the connecting cables.

Main malfunctions of a Makita rotary tool Malfunctions of the rotary tool are divided into electrical and mechanical malfunctions. In this article, we’ll take a look at all of the electrical faults on your Makita 2470 and 2450 and how to troubleshoot them:

Electrical problems with the Makita 2450 and Makita 2470 Electric faults are when the machine does not turn on when it is connected to a voltage source. The wiring diagram of a Makita peorator is simple.

The wiring diagram of the Makita 2450 is a series connection of the electric motor, start button and wires. The schematic diagram of the Makita 2470 is similar.

Through the connecting cord pos.72 Power supply voltage of 220 V is fed through the switch pos.68 and the electric brushes via the brush holder pos.66 On the lamellae of the electric motor rotor pos.54. and through the contacts of the reversing switch pos.60 to the stator winding pos.59. The most common fault is a lack of contacts in the connections.

Signs of fakes

Because of the great popularity of the equipment represented, cases of its falsification are not uncommon. There are relevant features that define a fake HR 2450. These include a small cord (about 0.5 m). The letters on the dark case clasps are matte in the fake, while the original has. shiny.

In the photo of the stator in the annotation the background of the real product is gray, almost snow-white. The copy will have a black, deaf background color.

If the HR two thousand four hundred 50 model case shows Japan as the manufacturer, it is not a real tool. The original has the words: “Made in P.R.C.”, т. е. “made in China.”.

assemble, gearbox, makita, rotary

Makita 2450″ contains a rubberized handle that has the serial number on it. All parts of the case should also contain each their own designation. A fake has a handle made of plastic instead of rubber. This should also be a signal to give up on the purchase of such a tool.

Disassembly diagram

In the process of repairing the presented equipment, the user must be able to disassemble the tool. The assembly diagram of the Makita 2450 has many parts and components. Not all of them should be known in order to make a repair. Here are the most basic elements that the diagram presents (“Makita 2450” is a very complex device).

assemble, gearbox, makita, rotary

The first is the retaining ring. It is involved in the chuck cover removal process. Next comes the ring locking device. It holds the ball for securing the drill. It is guided by a washer and a conical spring.

Four screws connect the gearbox to the motor. There are many rubber parts in the circuit, which become a frequent cause of breakage if they wear out.

This knowledge is sufficient for making repairs at home. The next step is to familiarize yourself with the technique of doing it.

Assembling the percussion shaft

First grease the inside of the cylinder pos.32 and insert the striker pos.30.

Remain in the inner housing pos.49 put the lubricated barrel assembly pos.21 in place by putting it on the lubricated cylinder pos.32. As a lubricant, it is recommended to use a special grease designed for Makita beater. Several types of grease are available: Makita P-08361 and Makita 183477-5 SDS-PLUS. Makita 183477-5 SDS-PLUS grease is recommended for the gearbox. Makita 196804-7 lubricant is used for the drill shanks.

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Lubricants differ in color but have exactly the same characteristics. Also what kind of grease is used in a Makita 2450 and 2470?

Here we have the assembled machine unit.

Now lubricate all parts of the mechanical block with the recommended grease. Here is an example of how to properly apply grease to the rotating surfaces.

Here is another example of a generous greasing of the mechanical block.

You can’t go wrong with butter

It’s also allowed to grease in this way. You can’t ruin a thing with butter!

The lubricated mechanical block must be covered with a plastic cover.14 black. With the housing on top of the assembly, press the housing down until the assembly is fully seated in it. Remain to insert the four screws pos.10 into the housing and screw in.

Now it’s turn to attach to the mechanical part of the electric motor rotor.

Fitting the rotor

The helical gear of the rotor is firmly seated in the housing of the mechanical unit and pressed.

Four m4×60 self-tapping screws pos.57. and screw them into the body of the electric unit.

Malfunctions of the gears

All tool damages can be divided into two main groups, electrical and mechanical.

Mechanical damage. Often you can even detect a mechanical malfunction by ear. Occurrence of grinding and increased noise during operation of the unit signal the operator to check and repair the peorator. Also, there may be an increase in the vibration of the appliance and an unpleasant odor coming from the body of the device.

Mechanical malfunctions include:

Makita DDF484 gear disassemble(BL Makita gearbox)|HD|Explicit inside gear assembly

  • Breakage of the device which performs switching of the instrument operation modes;
  • premature wear of rubber seals of striker and striker;
  • damage of the striker mechanism;
  • Wear of the unit’s barrel;
  • Breakage of gear teeth
  • Failure of the chuck to hold the percussion devices.

These problems are most often caused by improper use and maintenance of the machine.

Electrical malfunctions

This type of failure may also be accompanied by the appearance of an unpleasant odor from the device body, as well as the presence of arcing when the motor rotates. Special attention should be paid to the appearance of smoke and rapid heating of motor parts.

Faults of the electrical type include:

  • The device does not turn on;
  • Failure of the start button;
  • clogging of the collector of the electric motor;
  • brushes are damaged or worn out;
  • presence of a bad electrical contact in the circuit of the device;
  • Loss of electrical properties (burnout) of the rotor or stator windings of the motor.

Without knowledge of the basics of electrical engineering, the repair of the stator with your own hands is better not to make, it is advisable to contact a specialist.

Tips

With proper care and periodic cleaning of the tool, its service life will increase significantly. It is not unreasonable to follow some rules of operation to reduce the risk of malfunctions.

  • Inspect the condition of the machine before use.
  • Clean any dirt from the machine after completing your work. You can use an air blast, such as from a vacuum cleaner.
  • If you need to transport your power tool during cold weather, let it warm up before using it (the grease needs to thaw).
  • Follow the standards of operation given in the instruction manual.
  • Store the tool in a warm, dry room.
  • Do not allow moisture, as well as condensation from the air.
  • If the machine is not used for a long time, it is better to store it in plastic and a cardboard box.
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The following video shows how to troubleshoot your Makita torch.

Makita hr2450 disassembly video

Depending on the number of functions they perform, they are divided into three groups:

  • Single-mode. performs drilling with impact, for example, Makita HR 2010.
  • Two-mode systems. drilling and drilling with impact, or drilling with impact and chiselling. The most popular poehorator is the Makita HR 5001 C can drill with a hammer or chisel.
  • Three-mode. switchable in any operating mode. For example, the Makita HR 2450.
  • SDS Plus chuck is available in one, two and three modes with weight up to 5 kg. Specifications: power up to 850 watts, impact force up to 5, 3 J, the diameter of drilling in concrete 18-30 mm.
  • SDS max chuck allows two- and three-mode models with weight from 5, 9 kg. Characteristics: power 1100-1500W, impact force 8, 3-17, 5J, the maximum diameter of the drill 40-50mm, bits 105-160mm. Advantages: high power and low vibration level.

Makita Shop. “Is an official dealer of the Japanese company and offers a wide range of Makita rotary tools with the manufacturer’s warranty and delivery. Our trained professional managers will help you to choose the best model!

We offer Makita torches all over Russia: Moscow, St. Petersburg, Yekaterinburg, Chelyabinsk, Nizhny Novgorod and many other cities with delivery and warranty, please call! information about delivery conditions and price you can get from our managers.

Installing the electric brushes

Remove dirt from the brush holder grooves and install the brushes by locking them in place.

Now it’s time to check the performance of the torch. Connect the plug to the socket and switch on the rotary table for a short while in “drilling” mode. Check that the tool is operating correctly and switch it off. Set the mode switch to the “blow” position. Do not insert a tool. Check that the accelerator works in this position. At the same time you have checked the operation of the mode switch.

Now it’s time to check the speed regulator button installation, make sure the pins are securely fastened, and then install the cover plate.

Setting the Cover

The cover is fastened with three M×4 self-tapping screws of different lengths.

Connect the hedge trimmer to the mains 220Β and check in all modes. The Makita 2450 or 2470 is assembled and working properly!

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