How to Disassemble a Makita Hr2470 Hammer Video

Even very reliable Makita rotary hammers break down over time.
Any breakdown is eliminated, you only need to have straight arms and perseverance.
In addition to electrical malfunctions, rotary hammers are also subject to mechanical breakdowns.
The work of rock drills with solid materials in a dusty environment shortens the life of the machine and requires user intervention to perform preventive maintenance.

Repair of the mechanical part of the Makita 2450 and 2470 puncher

Any repair of the tool begins with the determination of the nature of the malfunction and disassembly.

A Makita 2450 and 2470 rotary hammer can be repaired by a user with basic locksmithing skills and knowledge of electrical safety requirements.

This article discusses the mechanical part of the Makita puncher, the main malfunctions and how to solve them.

How to Disassemble a Makita Hr2470 Hammer Video

Dismantling the mechanical part of the Makita 2470 rotary hammer

To get to the mechanical part of the punch, you need to remove or disassemble the cartridge.

Dismantling the quick release chuck
Place the hammer drill on the back of the cabinet on the surface of a table covered with a clean cloth or paper. Using tweezers or a screwdriver, remove the rubber tip 35, item 1.

Carefully loosen the annular spring, pos. 2, the clutch cover, pos. 3, the steel ring, pos. 4. You will reach a steel ball with a diameter of 7 mm, pos.20.

Now you can remove the case of the mechanical part
It is black.
Using a screwdriver, unscrew the four screws at the end of the case.Holding the black case with your right hand, press the end of the shaft from which the cartridge was disassembled with your thumb. The plastic case is easy to remove.

Next, remove the gearbox shaft.

To disconnect the mechanical part from the electric, you must first remove the electric brushes.
Remember! In the lower part of the body, the rotor is held by electric brushes, which must be removed.

After checking that the electric brushes are disconnected from the lamellas of the rotor, use a screwdriver to pry the metal case of the perforator at the border of the green plastic case.

Now we proceed to disconnect the rotor from the mechanical part of the punchpa The rotor is held in the mechanical part due to helical gears of the gearbox.
If you take the rotor case in one hand, and the mechanical part in the other case and pull it in different directions, swinging, you will separate these two nodes.

You get such a knot in the old grease.Next, unscrew the two M4 × 12 bolts, pos. 43, using the hexagon, item 2666273-7 with the internal hexagon head.
Pull out the shaft with the intermediate spur gear 10 pos. 80, art.226399-7.
from the inner case pos. 49, art. 153687-8. Clean parts from old grease.

Video: How to Disassemble a Makita Hr2470 Hammer Video

You get such a mountain of clean details.Now carefully review the details, immediately discard the rubber rings, picking up new ones.
Replace defective parts with new ones.

Mechanical makita 2450 and makita 2470 rock drill

Common mechanical problems with Makita rotary hammers include:

  • destruction of the quick-release cartridge;
  • bearing failure;
  • breakdown of the shock mechanism;
  • punch barrel wear;
  • wear of rubber strikers and striker;
  • gear breakage.

Repair of the perforator cartridge is done to replace the anther and rubber ring, as well as the conical spring and the steel ball, which provides clamping of the working tool (drill). What does the working tool indicate? namely, the drill is poorly held in the cartridge.

The main reason is the wear of a steel ball 7.0 pos.20, art. 216022-2. Ball wear occurs from contamination of the barrel of the cartridge due to ingress of dust and dirt.

The general view and arrangement of the Makita rotary hammer cartridge is shown in the photo below.

Do-it-yourself makita 2450 rotary hammer cartridge repair is easy to do. The cartridge must be disassembled, freed from old grease, discard rubber parts, replace defective ones.

complex failures require knowledge of the mechanical design of the Makita 2450 rotary hammer.

Having determined the nature of the malfunction of the Makita rotary hammer, proceed to disassemble the mechanical part called the gearbox.

Disassemble the mechanical part according to the attached video.
Release it from the old grease.
Carefully inspect all parts, their integrity, level of wear. All rubber products during any disassembly require replacement.

Consider repairing a perforator barrel. We will analyze the mechanism completely.
Video disassembly, lubrication and assembly of the Makita rotary hammer

Repair of parts of a shaft of the Makita 2450 puncher

Remember! In the lower part of the body, the rotor is held by electric brushes, which must be removed.

At the next stage, the rotor must be disconnected from the removed mechanism. The rotor is disconnected from the mechanism simply by pulling out, because it is held by the friction of two helical gears.

It turned out such a dirty knot.

Now you need to separate the shaft of the percussion mechanism.

Most often, rubber rings, striker poses wear out. 24, compressor spring pos. 18. and cylinder parts.Here’s how barrel parts wear out and collapse during improper use of the tool.

Consider the most difficult malfunction. failure of the shock mechanism.
The characteristic signs of failure of the impact mechanism is the absence of impact and the unpleasant noise of a working punch in the “Impact” mode.

Such a malfunction is typical for those perforators that during operation were pressed strongly against the work surface.
Having disassembled the gearbox, we remove debris and pieces of foreign objects. We find the defective part and clean everything from the old grease.

Very often the striker pos. 24 is destroyed, art. 324396-8, which is part of the trunk.metal ring pos. 27. art. 324216-6.Discard damaged parts, replace with new ones, cover with a thin layer of grease. Parts are ready for assembly. But more on that in the next article.