How to Disassemble a Makita Hr2450 Hammer Video

06/29/2016 07:02 2016-06-29T04: 02: 38.000Z


I got to my makita HR 2450 puncher, which lost a hit at the peak. There is an internal blow, but it is not transmitted to the peak.
In this video you will see how to disassemble and assemble the makita HR 2450 hammer drill
How to remove the makita HR 2450 punch mode switch. 0:33
How to remove the hammer drill. 1:16
How to understand the puncher gear. 2:05
How to assemble a gearbox. 19:15

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Even very reliable Makita rotary hammers break down over time.
No matter what kind of damage is fixed, you just need to have straight arms and assertiveness.
Apart from electronic defects, rotary hammers are also subject to mechanical damage.

The work of rock drills with hard materials in a dusty environment reduces the life of the machine and requires the intervention of the user during the repair.

At least some repair of the tool begins with determining the nature of the malfunction and disassembly.

A user who owns the original locksmithing skills and is familiar with electrical safety requirements can repair a Makita 2450 and 2470 rotary hammer.

Here, the mechanical part of the Makita punch, the main malfunctions and methods for eliminating them are considered.

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 puncher on the back of the cabinet on the surface of a table covered with a clean cloth or paper.

Dismantling the Makita HR 2450 rotary hammer

Using tweezers or a screwdriver, remove the rubber tip 35, item 1.

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

Now you can remove the case of the mechanical part
It is dark in color.
Using a screwdriver, unscrew the four screws at the end of the case.

Holding the dark case with your right hand, press with a huge finger on the shaft end from which the cartridge was disassembled. The plastic casing is simply removable.

Next, remove the gearbox shaft.

To disconnect the mechanical part from the electronic part, you need to pull out the electric brushes earlier.
Remember! At the bottom of the case, the rotor is held by electronic brushes, which must be pulled out without fail.

After checking that the electric brushes are disconnected from the lamellas of the rotor, use a screwdriver to pry the iron case of the punch at the border of the greenish plastic case.

Now we are running over to disconnecting the rotor from the mechanical part of the perforator

pa The rotor is held in the mechanical part through the use of helical gears of the gearbox.
If you take the rotor case in one hand, 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 an old grease.

Next, unscrew the two M4 × 12 bolts, pos. 43, art. 266273-7 with an internal hexagon head if there is a hexagon.
Take out the shaft with the pinion gear 10 pos. 80, art.226399-7.
from the inner case pos. 49, art. 153687-8.

Clean parts from old grease.

You get such a mountain of unsullied details.

And now carefully look through the details, immediately discard the rubber rings, picking up new ones.
Replace defective parts with new ones.

Common mechanical problems with Makita rotary hammers include:

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

Repair of the perforator cartridge is done to change the boot and the rubber ring, in addition to a conical spring and an iron ball, which provides clamping of the working tool (drill). This question shows what is a working tool? Specifically, a drill is poorly held in a cartridge.

The main reason is the wear of the iron 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 type and arrangement of the Makita rock drill punch cartridge is shown in the photo below.

It is not difficult to repair the makita 2450 rotary hammer cartridge at home. The cartridge needs to be disassembled, released from an old grease, discard rubber parts, replace defective ones.

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complex malfunctions require knowledge of the mechanical part of the Makita 2450 rock drill.

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 an old greasing.
Closely examine what remains to do to our client parts, their integrity, level of wear. What remains to do to our client rubber products at any sort of disassembly require a change.

Consider the repair of the hole punch. Let’s analyze the mechanism completely.
Video disassembly, lubrication and assembly of the Makita rotary hammer

Video: Makita 2450 rotary hammer bulkhead

Remember! At the bottom of the case, the rotor is held by electronic brushes, which must be pulled out without fail.

Next, from the pulled out mechanism, the rotor must be disconnected. The rotor is disconnected from the mechanism simply by pulling out, as it is held due to friction of 2 helical gears.

Such a dirty knot came out here.

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

In most cases, rubber rings, striker poses wear out. 24, compressor spring pos. 18. and cylinder parts.

Ah, so the barrel parts wear out and collapse if the tool is used incorrectly.

Consider the best complex malfunction. breakdown of the shock mechanism.
Corresponding signs of failure of the impact mechanism are the absence of impact and the nasty noise of the working hammer operating in the “Impact” mode.

Video: Minute of vandalism) (21) Makita HR 2450 rotary hammer Powerful kickback in impact mode

Such a malfunction is characteristic of perforators, which during use were very pressed against the work surface.
Having disassembled the gearbox, we remove fragments and pieces of third-party objects. We find the defective part and clean the rest of the old grease.

Often the firing pin pos.24 is destroyed, art. 324396-8, which is part of the trunk.

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

Discard warped parts, replace with new ones, cover with a narrow layer of grease. Parts are ready for assembly. However, about this decision in a subsequent article.

How to repair a Makita HR 2450 hammer drill if the shock mode is lost

The Makita power tool has long established itself as a professional, reliable and ordinary in maintenance. He also has good maintainability and relatively low price.

Of all the ruler ranges, I would like to slow down on the Makita HR 2450. The tool is very useful in operation, has three operating modes and can withstand very long loads. The puncher worked reliably for more than 6 years without breakage at the creator of these lines. over, he was used working in saturated loads.

However, as we know, nothing endless does not exist. And reliable technology breaks down. Somehow, in the midst of work, he did not peck. Working in rotation mode, the machine worked, and the blow suddenly disappeared.

The gearbox was disassembled and the cause of the breakdown was identified. A sleeve was broken in the barrel body when the striker (striker) specifically does the impact work.

For this reason, the drummer stuck in the fragments of a collapsed sleeve.

The service recommended completely changing the trunk. It turned out that the sleeve is pressed into the barrel at the factory and is not supplied separately. I had to take a completely new barrel.

Here, the creator will tell you how to bring the puncher into working condition after this, in general, easy breakdown. If of course you have the ability to repair power tools and the desire not to pay someone your hard earned money, then we take the tool and begin disassembling the machine.

Two simple flat-head screwdrivers and one Phillips screwdriver will come in handy. One of the flat screwdrivers can be narrow and narrow, less than 4 mm wide. A wire hook is also useful for removing the snap ring. It is made of a bicycle spoke, the main thing is that the wire is rigid and just does not bend. You will also need a rubber mallet or a wooden mallet.

Disassembly of the punch should begin with the removal of the protective rubber cap. anther. He just takes off, just grab it with your fingers and pull it off the barrel.

Then, having pressed on a plastic cover and having squeezed a spring of a lock of the SDS mechanism, we remove a lock ring with a screwdriver.

Using a screwdriver, remove the stopper

The lid is removed from the barrel, and after it, again compressing the spring, we pull out the retainer ball together with the spring and the figured washer.

After that, the mode switch is disassembled. Under the cover holding the reddish button-lock, of course, a special groove for the screwdriver. After inserting a screwdriver into the myth and prying off the lid a little at first from the textbook of the edge, and then from the second, carefully remove it. It is not recommended to make significant efforts, the lid is still plastic and may break. The reddish button together with the spring is removed from the switch housing, and it switches to the left according to the full program, a little further than the drilling mode. It is from this position that he is removed from the gearbox. For this operation, the switch needs to be picked up a little with thin screwdrivers on both sides and removed together with the rubber O-ring.

Remove the punch mode switch

Now the gearbox is being removed. Using a Phillips screwdriver, unscrew the four bolts connecting the box to the stator housing. Then, holding it with your hand, you need to hit a little with a mallet on the end of the barrel so that the box comes off the gearbox.

Remove the gearbox

Having removed the box, we take out the barrel from the gearbox. It is removed simply.

We take the barrel out of the gearbox

With a rag, you need to remove the old grease, and wash the barrel with gasoline using another kerosene and wipe it dry.

What is needed, as mentioned above, it was necessary to completely change the entire trunk. But this item acquired in a car service turned out to be “a goal like a falcon”. In other words, nothing happened here and we had to do what our client had to do to rearrange the parts from the old barrel to the latest "blank".

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The most difficult operation was extracting the drummer from the barrel. There are special holes in the barrel body through which a snap ring is visible. This ring holds the striker in the saddle with rings and rubber dampers. Having inserted a narrow screwdriver into the hole, we bend the ring a little. We do this at first a positive point in that, and then on the other. The stop must come out of the groove.

Using 2 screwdrivers, squeeze the stopper

Then, from the inside, we pull out the stopper from the wire with a homemade hook into the light of God.

Using a wire hook, pull out the stopper from the inside

Next, we remove the striker with washers and rubber rings. It is necessary for assembly to clarify or sketch the placement of all rings and washers. If something goes wrong, photos and pictures from the article will help.

Now you need to remove the gear from the shaft. Having pressed on a washer and having squeezed a spring, with a narrow screw-driver it is necessary to take a lock ring from a flute. After removing it, remove the washer, spring and gear from the barrel.

Video: How to Disassemble a Makita Hr2450 Hammer Video

The gear wheel is put on a new barrel and engages with splines. Following this address is a spring with a washer and a stopper. Insert the retaining ring and lock the mechanism in the working position.

For this purpose, you should take the barrel in both hands and, resting it on your hands, use your fingers to squeeze the spring with force, immediately pushing the washer and stopper down. You need to compress until the stopper engages in the groove.

Then, a striker with washers and rubber rings is installed inside the barrel in the order in which he understood. However, before this, it is necessary to monitor the condition of the drummer, his appearance.

If the striker has potholes and shells after a long work in another way, since it was scratched on a broken sleeve, then it should not be sanded.

For this purpose, it is clamped into the drill chuck and processed with a fine sandpaper. If the bulges are very huge, then the drummer will be easier to replace.

It is necessary to lubricate the striker with special grease before installation and in the near future use lubricant during operation. When inserting a drill into the hammer, you need to apply a little lubricant to its shank. This extends the life of the machine.

Having installed the striker mechanism in the barrel, we fasten it with the circlip. Using a screwdriver, we try to move the drummer from both sides inside the barrel. He should just walk in the canal and not even jam.

The assembled barrel is installed in the gear housing. Putting it on the cylinder with a piston, we engage it with the pinion gear and insert it into the housing. Our customer remains the details should be perfectly lubricated during assembly.

Install the barrel in the gearbox

Then we install the gearbox, having previously greased the needle bearing. With 4 bolts we draw the box to the stator housing and set the operating mode switch to the area. For this purpose, set it to a position slightly to the left of the drilling mode.
We insert the reddish latch button with the spring and move the switch to the drilling mode. We click on the plastic cover and check the operation of the switch.

Set the mode switch to the area

We snap the cover of the punch mode switch

Then, ending with a chord, the SDS mechanism is assembled. Having installed the spring of the mechanism, we put on a curly washer and insert the ball. After completing the plastic cover, compress the mechanism spring and insert the snap ring. Putting on a rubber boot is no longer difficult.

Having pressed a spring with a washer, we establish a ball a clamp

Install the SDS engine

We try a hammer drill under load. During operation of the machine, there is no external noise in the gearbox; the operating mode switch should simply move without jamming. That, everything should work, as before the breakdown.

The creator of this article hopes that it will help honored readers figure out how to repair a punch. It doesn’t matter what kind of damage it may turn out to be easy if you find its cause. And then everything depends on your skill and diligence.

In the construction industry, the use of Makita rotary hammers is very important. The value of this technique can hardly be overestimated; it is indispensable when working with concrete, stone as it is also called brick. Especially strong materials remain for our client to give in to the pressure of this universal tool. In everyday life, Makita punchers are used for drilling holes in concrete and stone, for the production of gaps, recesses, cable channels in the walls and in the floor.

The Makita rotary hammer has dual motor protective insulation. Among the indispensable parts of the structure there is an uncoupling clutch that prevents jerking when the drill is jammed, and electric speed control. Corporate identity indicator. the instrument is equipped with a comfortable suitcase for storing the instrument.

Most of the models are equipped with a dust removal system and are available with a soft rubber pad on the handle. The assortment includes Makita rotary hammers, both with a direct and vertical arrangement of the motor.

It can do 3 functions: drilling, drilling with impact, chiselling.

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

  • single-mode. do drilling with a blow, for example, Makita HR 2010.
  • dual-mode. drilling and drilling with impact, or drilling with impact and chiselling. The most popular hammer drill is. Makita HR 5001 C can drill with a blow or hammer.
  • three-mode. switch to any mode of operation. For example, Makita HR 2450.
  • With SDS Plus, single, dual and tri-mode rotary hammers weighing up to 5 kg are available.
    Feature: power up to 850 W, impact force up to 5, 3 J, drilling diameter in concrete 18-30 mm.
  • With the SDS max cartridge two- and three-mode models in weight from 5, 9 kg are offered.
    Trait: power 1100-1500W, impact force 8, 3-17, 5J, the largest drill diameter 40-50mm, crowns 105-160mm.
    Advantages: the highest power and low level of vibration.

Shop "Makita. "Is a dealer of a Japanese company and offers a wide range of Makita rotary hammers with a manufacturer’s warranty and delivery. Professional managers who have completed training courses will help to choose the best model!

We want to offer Makita punchers throughout Russia: Moscow, St. Petersburg, Yekaterinburg, Chelyabinsk, Nizhny Novgorod and other towns with delivery and warranty, call! You can find out detailed information about the methods and prices of delivery from our managers.

Due to the ingress of dust, dirt and moisture, the internal lubricant becomes hard over time and does not fulfill its purpose. The hammer starts to work with extraneous noise. Before repairing the punch, be sure to read the attached instructions for disassembling, lubricating, and assembling the components of the Makita 2450, 2470 punch. The layout of the Makita 2450 and 2470 punch will help to disassemble the failed parts correctly and find defective parts. And also we will tell how to disassemble the Makita 2450 puncher.

Disassembly of the Makita 2470 punch starts with the removal of the mode switch knob.

Punch disassembly procedure

Place the hammer drill on a clean surface.

When disassembling the mechanical part of a Makita 2450 or Makita 2470 rotary hammer, you must always remove the mode selector knob.

At the beginning of operation, the handle is set to the “Impact” mode (extreme right position clockwise).

How to Disassemble a Makita Hr2450 Hammer Video

On the handle, using a screwdriver, poke and release the latch.
After removing the latch, the handle is moved to the leftmost position, in the "Drilling" mode.The handle clamped with fingers is removed from the grooves of the housing.

Video instruction for disassembling the Makita 2450 punch mode selector knob

How to set the mode knob

To install the mode switch in the case, you need to perform some actions:
insert the switch into the “drilling” position in the seat slot until it clicks;
turn the switch counterclockwise to the “strike” position;
move the switch with a click counterclockwise to the “drilling” position;
insert the spring and the red button;
insert the cover on top until it locks in place.
The mode switch is assembled.

At the second stage, you should disassemble the quick-detachable cartridge and repair the punch cartridge with your own hands. By the way, the cartridge needs to be disassembled only on models of the Makita 2470. The cartridge device is quite simple, and any person with a little knowledge of locksmithing skills can cope with its repair.

Makita rotary hammer disassembly procedure

Repair of the perforator cartridge begins with the installation of the perforator vertically on the rear housing cover. The hrMakita hammer drill circuit will help you properly disassemble.
Is a Makita 2470 rotary hammer cartridge replacement needed? The answer can be obtained only after a complete disassembly of the cartridge with your own hands.
Using a screwdriver or puller, the boot is removed, the cartridge is released from the retaining ring, clutch cover, metal ring 20 pos. 4. Next, you need to carefully get the ball pos.20, remove the guide washer pos.5 and the conical spring pos.6 that supports it. The cartridge is disassembled.

The diagram below shows the design of the perforator cartridge.

The main malfunctions of the makita 2450 punch, causing defects in the operation of the chuck, are:

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

Repairing a perforator cartridge is not a complicated procedure and is usually easy to carry out by anyone who can hold a screwdriver in their hands.

If replacing a rubber boot, retaining ring, conical spring is not difficult, then replacing a new ball requires attention. The new ball must have a diameter of 7 mm ± 1 μm.
As lubricants, it is recommended to use a special grease developed for the Makita rotary hammer.
The grease has an index of Makita P-08361, Makita 183477-5 SDS-PLUS 30 g for the gearbox. Makarov 196804-7 grease is recommended for drill shanks.

When assembling the cartridge, install the conical spring with the narrow side facing the punch.
Do not forget, do-it-yourself cartridge repair requires careful attention from the collector.

Assembly procedure for quick release chuck

Assembly is carried out on a clean surface. Parts are pre-washed, dried and greased with a thin layer of recommended grease.

The gearbox shaft is lubricated with Makita 183477-5 SDS-PLUS grease. On the shaft in a certain sequence, all incoming parts of the cartridge are collected.After installing the conical spring, pos.6, put on the guide washer pos.5 and fix it with the ball pos.20, inserting it into the groove of the gearbox shaft.It remains to put on the ring pos. 4, the casing of the coupling pos. 3, fix the parts with the locking ring pos. 2. At the last stage, insert the protective tip pos. 1 into the end face of the cartridge
The Makita 2450 rotary hammer cartridge repair is now complete. It remains to check its quality by inserting a drill into the cartridge. With proper assembly, the cartridge holds the drill from spontaneous loss.
Cartridge assembled.

Disassemble the gearbox

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

The procedure for dismantling the mechanical part of the Makita rotary hammer
The protective black plastic case is first removed. The case is removed after you unscrew the four screws securing the case from the end.
By pushing on the shaft end you squeeze the gearbox out of the housing.

After removing the housing, it is necessary to separate the rotor from the gearbox. A reducer is a general mechanical part.
The rotor is separated from the mechanical part (gear) simply.
With your right hand you need to hold the gearbox, hold the rotor with your left.
Swinging, pull both sides in opposite directions. The rotor is held in the gearbox due to the friction of helical gears.
The main malfunctions of the Makita rotary hammer occur in the mechanical part of the tool.

The most characteristic malfunction for the mechanical part, the failure of the shock mechanism.

Dismantling the hammer
The shock mechanism is assembled on the inner case and consists of a gear shaft and an intermediate shaft.
Rotational motion is transmitted through helical gears to the countershaft.

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

A small spur gear mounted on an intermediate shaft transmits rotation to a large spur gear of the gearbox shaft in which the percussion mechanism is mounted.
And the translational movements on the gearbox shaft of the shock mechanism are simultaneously transmitted due to the transfer from the rolling bearing of the intermediate shaft to the cylinder moving in the gearbox barrel.

We proceed to disassemble the intermediate shaft.

Dismantling the countershaft

On the shaft pos. 40, a helical gear pos. 42 is mounted, on which rotation is transmitted from the rotor gear, a rolling bearing 608zz pos. 41, which transmits translational motion to the joint pos. 34 of the piston pos. 32.
On the other side of the shaft, a clutch pos.39, spur gear 10 pos.80, compression spring pos.38, snap ring S-7 pos.37, bearing 606zz pos.36
Particular attention should be paid to the condition of the rolling bearings.
The punch has imported bearings. Allowed the installation of domestic bearings.
Bearing 606zz can be replaced with 80016, bearing 609zz is changed to 80019.

We proceed to disassemble the shaft of the shock mechanic

Dismantling the shock shaftDismantling the barrel of a Makita 2470 rotary hammer is a simple process using the Makita rotary hammer design.
The shaft is a barrel pos.21, in which the shock mechanism is assembled.
A gear pos.19 is attached to the barrel, which is pressed by the spring pos.18, through the washer pos.17 and fixed by the locking ring pos.16.The cylinder pos. 32 moves in the barrel, acting on the striker pos24. On the reverse side of the striker is fixed a metal ring pos. 27, transmitting the blow to the drill.
And when do you need to replace the barrel of a punch?

Most often, a metal ring fails.StrikerDrum cylinder

With the disassembly, we figured it out.
We change the parts to serviceable and are preparing to assemble. Learn more about grease and punch assembly.