Self-repair Of The Makit Perforator Barrel With A Selection Of Spare Parts

2023 Author: Philip Bishop | [email protected]. Last modified: 2023-08-25 07:54

• Repair of the mechanical part of the Makita 2450 and 2470 perforator
• Mechanical malfunctions of the Makita 2450 and Makita 2470 rotary hammers
• Repair of parts of the barrel of the Makita 2450 perforator

Even very reliable Makita drills break down over time.

Any breakage is eliminated, you just need to have straight arms and perseverance.

In addition to electrical faults, rotary hammers are also subject to mechanical damage.

Operation of rock drills with hard materials in dusty environments will shorten the service life and require user intervention to perform preventive maintenance.

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

Any tool repair begins with determining the nature of the malfunction and disassembling.

The Makita 2450 and 2470 hammer drill can be repaired by a user who has initial locksmith skills and is familiar with electrical safety requirements.

This article discusses the mechanical part of the Makita rotary hammer, the main malfunctions and how to fix them.

Dismantling the mechanical part of the Makita 2470 rotary hammer

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

Disassembling the quick-release chuck

Place the punch on the rear case cover on a table surface 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 coupling cover, pos. 3, and the steel ring, pos. 4. You will reach a steel ball with a diameter of 7 mm pos. 20.

Now you can remove the housing 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 your thumb on the end of the shaft from which the cartridge was disassembled. The plastic housing can be easily removed.

Next, you need to remove the gearbox shaft.

To disconnect the mechanical part from the electrical one, you must first remove the electric brushes.

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

After checking that the electric brushes are disconnected from the rotor blades, use a screwdriver to pry the metal housing of the hammer drill at the border of the green plastic housing.

Now we turn to disconnecting the rotor from the mechanical part of the hammer drill

. The rotor is held mechanically by the helical gears of the reducer.

If you take the rotor housing in one hand and the mechanical housing in the other and pull in different directions, swinging, you will separate these two units.

You will get such a unit in the old grease.

Then unscrew with a hexagon two bolts M4 × 12, pos. 43., art.266273-7 with an internal hex head.

Pull out the shaft with the intermediate spur gear 10 pos.80, art.226399-7.

from the inner body pos. 49, art. 153687-8. Remove old grease from parts.

You will get such a mountain of clean details.

Now carefully look through the details, discard the rubber rings immediately, picking up new ones.

Replace defective parts with new ones.

Mechanical malfunctions of the Makita 2450 and Makita 2470 rotary hammers

Frequent mechanical failures of Makit punchers include:

• destruction of the quick-release chuck;
• failure of bearings;
• breakage of the striking mechanism;
• punch barrel wear;
• wear of striker and striker rubber bands;
• breakage of gears.

The hammer drill chuck is repaired to replace the boot and rubber ring, as well as the conical spring and steel ball, which secures the working tool (drill). This is indicated by what is a working tool? namely, the drill does not hold well in the chuck.

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

The general view and device of the Makit perforator cartridge is shown in the photo below.

Do-it-yourself repair of the makita 2450 perforator cartridge is easy. The cartridge must be disassembled, freed from old grease, discarded rubber parts, replaced defective.

More complex malfunctions require knowledge of the mechanical part of the Makita 2450 perforator

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

Disassemble the mechanical part according to the attached video.

Free it from old grease.

Carefully inspect all parts, their integrity, level of wear. All rubber products require replacement during any disassembly.

Consider repairing the barrel of a rock drill. Let's analyze the mechanism completely.

Video of disassembly, lubrication and assembly of the Makita perforator

Repair of parts of the barrel of the Makita 2450 perforator

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

The next step is to disconnect the rotor from the removed mechanism. The rotor is simply disconnected from the mechanism by pulling it out, since it is held by the friction of two helical gears.

The result is such a dirty knot.

Now you need to separate the percussion shaft.

Most often, the rubber rings wear out, the firing pin pos. 24, compressor spring pos. 18. and cylinder parts.

This is how barrel parts wear out and collapse when the tool is misused.

Consider the most difficult malfunction - the failure of the percussion mechanism.

The characteristic signs of a breakdown of the percussion mechanism are the absence of a blow and the unpleasant noise of a working perforator in the "Blow" mode.

Such a malfunction is typical for those rotary hammers that, during operation, were strongly pressed against the surface to be treated.

Having disassembled the gearbox, we remove debris and pieces of foreign objects. We find the faulty part and clean everything from the old grease.

The striker, pos. 24, art. 324396-8, which is part of the barrel.

metal ring pos. 27. art. 324216-6.

Discard damaged parts, replace with new ones, cover with a thin layer of grease. The parts are ready for assembly. But more on that in the next article.

I wish you success!