How To Repair The Cartridge And Percussion Mechanism Of The Barrel Of The Makita 2470 Rock Drill

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Video: How To Repair The Cartridge And Percussion Mechanism Of The Barrel Of The Makita 2470 Rock Drill

Video: How To Repair The Cartridge And Percussion Mechanism Of The Barrel Of The Makita 2470 Rock Drill
Video: Hammer drill Makita HR2470 fix mechanical problem 2023, September
How To Repair The Cartridge And Percussion Mechanism Of The Barrel Of The Makita 2470 Rock Drill
How To Repair The Cartridge And Percussion Mechanism Of The Barrel Of The Makita 2470 Rock Drill
Anonim
  • Punch disassembly procedure
  • Video instruction for disassembling the knob of the mode switch of the Makita 2450 perforator

  • The procedure for disassembling the Makita perforator cartridge
  • Quick release chuck assembly procedure
  • We disassemble the gearbox
  • Malfunction of the drill stop during hammer drilling
  • Video of a quick disassembly of the Makita puncher

Due to the ingress of dust, dirt and moisture, the internal lubricant becomes hard over time and does not fulfill its intended purpose. The hammer drill starts to work with abnormal noise. When starting to repair a hammer drill, be sure to read the attached instructions for disassembly, lubrication, and assembly of the Makita 2450, 2470 hammer drill units. The Makita 2450 and 2470 hammer drill diagram will help you to properly disassemble faulty units and find defective parts. We will also tell you how to disassemble the Makita 2450 puncher.

Disassembly of the Makita 2470 perforator begins with the removal of the mode switch knob.

Punch disassembly procedure

Place the rock drill on a clean surface.

When disassembling the mechanical part of the Makita 2450 or Makita 2470 hammer drill, you should always remove the mode switch knob.

At the beginning of work, the knob is set to the "Impact" mode (extreme right position clockwise).

Image
Image

On the handle with a screwdriver, the latch is picked up and removed.

Image
Image

After removing the latch, the handle is moved to the extreme left position, in the "Drilling" mode.

turning counterclockwise to drilling position
turning counterclockwise to drilling position

The grip clamped with fingers is removed from the grooves of the case.

Video instruction for disassembling the knob of the mode switch of the Makita 2450 perforator

Video:

Mode Knob Setting

To install the mode switch into the body, you need to perform some actions:

• insert the switch into the “drilling” position into the seat until it clicks;

• move the switch counterclockwise to the “impact” position;

• move the switch with a click counterclockwise to the "drilling" position;

• insert the spring and the red button;

• insert the cover from above until it engages.

The mode switch is assembled.

view of the mode switch 2450
view of the mode switch 2450

At the second stage, you should disassemble the quick-release chuck and repair the drill chuck with your own hands. By the way, the cartridge requires disassembly only for Makita 2470 models. The cartridge device is quite simple, and any person who has a little bit of locksmith skills can handle its repair.

The procedure for disassembling the Makita perforator cartridge

Punch chuck repair begins with installing the punch vertically on the rear housing cover. The scheme of the h-makita perforator will help to correctly perform the dismantling work.

Is it necessary to replace the cartridge of the Makit 2470 perforator? The answer can be obtained only after complete disassembly of the cartridge with your own hands.

Using a screwdriver or a puller, the boot is removed, the cartridge is freed from the retaining ring, the coupling casing, the metal ring 20 pos. 4. Then you need to carefully get out the ball, pos. 20, remove the guide washer, pos. 5, and the conical spring, pos. 6, which supports it. The cartridge is disassembled.

cartridge spare parts
cartridge spare parts

The diagram below shows the device of the punch chuck.

cartridge
cartridge

The main malfunctions of the makita 2450 hammer drill that cause defects in the chuck are:

  • wear of the protective rubber boot pos.1;
  • relaxation of the retaining ring pos. 2 or its partial wear;
  • ball wear, pos. 20;
  • loss of elasticity of the conical spring pos. 6 or its extension.

Repairing a hammer drill chuck is not a complicated procedure and is usually easily done by anyone who can handle a screwdriver.

If replacing a rubber boot, retaining ring, conical spring is not difficult, then replacing a new ball requires attention. The new ball should be 7mm ± 1 µm in diameter.

As a lubricant, it is recommended to use a special lubricant developed for the Makita perforator.

The grease has the index Makita P-08361, Makita 183477-5 SDS-PLUS 30g for the gearbox. It is recommended to use Makita 196804-7 grease for drill shanks.

When assembling the chuck, install the conical spring with the narrow side to the hammer drill.

Do not forget, repairing a punch cartridge with your own hands requires care from the collector.

Quick release chuck assembly procedure

The assembly is done on a clean surface. Parts are pre-washed, dried and lubricated with a thin layer of the recommended grease.

The gearbox shaft is lubricated with Makita 183477-5 SDS-PLUS grease. All incoming parts of the chuck are assembled on the shaft in a certain sequence.

chuck lubrication and assembly
chuck lubrication and assembly

Having installed the conical spring, pos. 6, put on the guide washer, pos. 5, and fix it with the ball, pos. 20, by inserting it into the groove of the gearbox shaft.

Image
Image

It remains to put on the ring (pos. 4), the coupling casing (pos. 3), fix the parts with the locking ring (pos. 2). At the last stage, insert the protective tip pos. 1 into the end of the cartridge, the

repair of the Makita 2450 perforator cartridge is finished. It remains to check its quality by inserting a drill into the cartridge. When properly assembled, the chuck keeps the drill from falling out spontaneously.

The cartridge is assembled.

We disassemble the gearbox

To get to the mechanical part, you need to remove the plastic case.

The procedure for disassembling the mechanical part of the Makita perforator

First, the protective black plastic case is removed. The case is removed after you unscrew the four screws securing the case from the end.

Pressing on the end of the shaft, you push the gearbox out of the housing.

After removing the housing, it is necessary to separate the rotor from the gearbox. A general mechanical part is called a reducer.

It is easy to separate the rotor from the mechanical part (gearbox).

Clamp the gearbox with your right hand, clamp the rotor with your left.

Swinging, pull both sides in opposite directions. The rotor is held in the gearbox by the friction of the helical gears.

The main malfunctions of the Makita perforator occur in the mechanical part of the tool.

The most typical malfunction for the mechanical part is the failure of the percussion mechanism.

Disassembly of the percussion mechanism The percussion mechanism is

assembled on the inner case and consists of a gearbox shaft and an intermediate shaft.

The rotary motion is transmitted via helical gears to the intermediate shaft.

removal of the intermediate shaft
removal of the intermediate shaft

The gearbox shaft is a hollow barrel in which the cylinder moves freely.

percussion mechanism with barrel
percussion mechanism with barrel

A small spur gear mounted on the intermediate shaft transfers rotation to the large spur gear of the gearbox shaft, in which the impact mechanism is mounted.

And the translational movements on the shaft of the percussion gear reducer are simultaneously transmitted due to the transmission from the rolling bearing of the intermediate shaft to the cylinder moving in the gearbox shaft.

We proceed to disassembling the intermediate shaft.

Dismantling the intermediate shaft

general view of the intermediate shaft
general view of the intermediate shaft

On the shaft poz.40 mounted helical gear poz.42, which is transmitted rotation from the rotor gear, rolling bearing 608zz poz.41, which transmits the translational motion to the hinge poz.34 piston poz.32.

On the other side of the shaft, a clutch clutch (pos. 39), spur gear 10 (pos. 80), a compression spring (pos. 38), circlip S-7 (pos. 37), bearing 606zz (pos. 36)

should be paid special attention to the condition of the rolling bearings.

Imported bearings are installed in the hammer drill. Installation of domestic bearings is allowed.

Bearing 606zz can be changed to 80016, bearing 609zz is changed to 80019.

Moving on to disassembling the shock mechanic's shaft

Disassembly of the percussion mechanism shaft

impact shaft
impact shaft

Disassembling the barrel of the Makita 2470 perforator is a simple process if you use the diagram of the Makita perforator.

The shaft is a barrel poz.21, in which the impact mechanism is assembled.

A gear, pos. 19, is attached to the barrel, which is pressed down by a spring, pos. 18, through a washer, pos. 17, and fixed with a retaining ring, pos. 16.

trunk
trunk

The cylinder, pos. 32, moves in the barrel, acting on the firing pin, pos. 24. On the reverse side of the firing pin, a metal ring pos. 27 is fixed, which transfers the impact to the drill.

And when do you need to replace the drill barrel?

Most often, the metal ring fails.

impact bolt body wear
impact bolt body wear

Striker

impactor defect
impactor defect

Cylinder with striker

Screenshot_1
Screenshot_1

We figured out the disassembly.

Malfunction of the drill stop during hammer drilling

The reasons when the Makita hammer drill drills with a blow, and the drill turns, is the wear of the teeth of the safety gear and the teeth of the barrel. Often, such a malfunction appears when using a perforator as a mixer for mixing mixtures. During operation, the safety clutch slips, and if we take into account the spring load, the load is large.

With a visual examination, the diagnosis will not work. You can remove the barrel and fix it in a vice and turn the gear with a wrench, but this can be understood with severe wear, in most cases only disassembling the barrel for diagnostics will help.

repair cranking makit
repair cranking makit

Advice on what to do in this case. If it is not possible to remove a suitable part or replace it, then assess the barrel wear. This is done like this, insert a new drill and move around, if the backlash is large, then it is better to replace the barrel completely.

It is worth noting that the reason for the scrolling of the drill during hammer drilling can be:

  • worn out bearings
  • the gear near the drunken bearing can be licked off.

Video:

On sale, if you look, you can buy a gearbox assembly for a perforator and its cost is about 2,000 rubles.

The reliability of some sellers raises doubts, and if you consider that often these are parts taken from analogs of the instrument that are traded, for example, on Avito. How to distinguish a fake punch from the original.

For example, there are many Chinese Makita analog punchers. An example is a network puncher FAVORITE RH 950 and its cost in the aisle is 3000 rubles. which is profitable to sell for spare parts.

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Image

We change the parts for serviceable ones and get ready to assemble. Learn more about drill lubrication and assembly.

Read if there are problems with the electrical part of the hammer drill.

Video of a quick disassembly of the Makita puncher

Video:

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