All About Hitachi Rotary Hammers

Power tool company Hitachi maintains its position as the market leader in similar construction equipment. Users consider the performance and power of the equipment to be the main quality advantage. When developing new species, the brand's specialists rely on optimization and moderation. All these qualities can be observed in the Hitachi rotary hammer, which is available to users in various modifications.

Hammer drills came to the service of people in the 19th century, when the development of the mining industry began. Its main function is to strike while drilling. The technique got its derivative name from the Latin word perforo - to punch. If you make a literal translation of the word "puncher", you get "punching machine".

Those inexperienced in construction work and technology may not see much of a difference between a drill and a hammer drill. The first one is much lighter in weight and is suitable exclusively for simple work in everyday life. It is convenient for drilling holes for fasteners, for example, for installing shelves or a mirror. It is used to work with materials such as drywall, wood or concrete. In short, what she can drill. But she is no longer able to break through a powerful wall through and through, and here a puncher comes to help the builders. He not only drills through the thickness of the material, but simultaneously punches through it with blows.

The impact force of Hitachi hammer drills has a takeoff from 1.4 J to 20 J. By weight, from 2 to 10 kg. Accordingly, these indicators determine the power of the equipment and its purpose. For Japanese technology, it will not be difficult to punch a hole up to 32 mm in diameter in metal, and up to 24 mm in concrete. This indicator depends on the modification of the Hitachi device.

Perforators differ in several types.

• Electric or rechargeable. They work both from the mains and from the accumulators. They are attached to the instrument itself or to a special belt.
• Pneumatic. They are used in difficult conditions, for example, in explosive environments.
• Gasoline. They work like jackhammers. Most often used in road construction work.

Manufacturers of the Hitachi brand track demand across the entire product line. The greatest interest in the construction market is caused by battery-class rotary hammers, in particular, on lithium-ion cells. The cordless rotary hammer is ideal for tough heavy duty construction jobs. But this does not mean at all that the manufacturer has abandoned light network models. The leader in this class belongs to the Hitachi DH24PH rotary hammer. It is most often taken for construction work in everyday life.

There are three main classes of rock drills in the construction market. The most popular is the light class technique. It accounts for about 80% of the total number of all rock drills produced. Equipment weighing up to 4 kg, with a power of 300-700 W, with a shock up to 3 J. Works in three modes:

• drilling and chiselling;
• drilling only;
• chiseling only.

Such equipment is most often purchased for household work.

An average hammer drill by weight can reach 8 kg. It has a power of 800 to 1200 W, a power of 3 to 8 J. It works in two modes. Unlike its light brother, one of the modes is excluded from it. There is a "drilling + chiseling" function, but the other two vary depending on the purpose of the hammer drill. Such equipment is purchased for production needs.

When buying a Hitachi rotary hammer, the user receives the tool itself with all the components in the assembly and a case for storing and carrying it. It is recommended to consult with the store's specialists before buying, what other additional devices may be needed for its further operation. As a rule, the assortment always contains a variety of attachments, add-ons, consumable components.

There are the following types of attachments:

• construction drill;
• drill bit;
• chisel;
• peak;
• scapula.

The brushes and the barrel are already included in the general kit of the purchased rotary hammer. However, the technique tends to break down. Any component part can always be found and bought in specialized stores, replacing the broken one with a new one yourself or by entrusting it to professionals. Purchasing add-ons or spare parts for repair will not be a financial problem for the owner as Hitachi has an Affordable Price policy.

Before going shopping, you need to ask yourself - for what purpose a puncher is required. If, for example, concrete walls are to be destroyed, then it is worth taking a closer look at the range of medium and heavy-duty perforators. And also it is worth immediately thinking about where the work will be carried out. And this is a new choice for the buyer. Which one is better: running on electricity or on batteries.

A cordless hammer drill, by the way, can cost 2-4 times more expensive than a similar network one. To avoid the price trap, experienced users recommend purchasing an additional cable of the correct length.

Immediately it is worth deciding on the mode of operation of the perforator. The best option is in the "three" mode, which will allow you to switch it when working with different materials. This will keep the equipment working as long as possible.

If we compare Hitachi rotary hammers with similar equipment from other manufacturers, then the following characteristics should be noted:

• lack of unnecessary newfangled functions;
• stable power level;
• structural reliability.

Thanks to this, an overall good impression is formed about the technique, from which the hands are least tired. As for the price, the Japanese brand rotary hammers maintain an overall price balance in comparison with other manufacturers. The cost of equipment, for example, in the online store of light class punchers, ranges from 5.5 thousand rubles to 13 thousand rubles. The price may be higher by 1-2 thousand rubles if the device is purchased at a service center. At the same time, the hammer drill receives a guarantee for repair and maintenance.

The hammer drill is a powerful and sturdy technique. But he also needs certain care and attention. Upon purchase, each user receives an operation manual that allows the equipment to serve for a long time.

• When replacing any spare parts, the equipment must be disconnected from the electricity.
• The start of operation and completion is carried out in the "idle" mode.
• Work on drilling deep holes is carried out step by step, since it is necessary to constantly clean the drill from small particles and dirt.
• The technique should not work at full capacity, only in some cases. It is best to stick to the "golden mean".

• The hammer drill is not a jackhammer, although it is sometimes used for this purpose. Work in this mode is allowed in the amount of no more than 20% of the total productivity.
• The instructions clearly state the timing of lubrication work, replacement of carbon brushes. This must always be remembered.
• After the completion of the work, the technique is blown through. To do this, it must work in idle mode for 1-2 minutes. This will rid it of dust.
• The unit must be wiped clean. It should be a clean and damp cloth, never wet.
• The use of cleaning agents such as gasoline and solvents is prohibited. It is allowed to carry out cleaning with a soapy solution of low concentration.
• After cleaning, the technician is wiped with a dry cloth and sent to his case.
• The unit is stored in a dry place out of the reach of children.

In case of breakdowns, it is necessary to figure out which part they can relate to: mechanics or electrics.

Typical electrical faults:

• the button does not work;
• there is no smooth start and speed control;
• sparks come from the brushes.

Typical mechanical faults:

• there is extraneous noise;
• the blow was gone;
• grease "spits".

To fix these problems, it is not at all necessary to contact the service center. Repair can be done by hand. Let's take a look at what actions will need to be taken in case of some malfunctions. If the punch does not respond to the button.

• Wires burned out or fell out of the terminal. Replace or return wires to their place.
• The wires in the network cable were twisted and broke in the area of ​​the handle. The damage is removed and the cable is reconnected.
• Worn motor brushes. They are being replaced.
• Dust clogged. Disassemble and clean.
• Development of a button. It is being replaced.

In the event of a spark of the brushes, this happens when they are weakly pressed against the rotor collector, or they are worn out. It is necessary to replace them.

When the engine starts to show up with sparks, the reason lies in the dust on the brushes and collector contacts. Cleaning will correct the situation. When the brush starts to spark on one side, the problem is due to a breakdown in the stator winding. If on both sides - the rotor burned out. It is necessary to replace the entire engine or its individual parts.

Abnormal mechanical noise can occur when there is a bearing problem. They are being replaced.

Of course, each case is different. Sometimes the noise just lets its owner know it's time to change the lubricant.

If the device began to spit out grease, then the problem arose due to the wear of the oil seals. They will need to be replaced.

When the hammer drill starts to hammer poorly, then the problem is in the compression piston ring. It's just worn out. Another reason for poor performance of equipment can be the presence of dust and dirt in the lubricant. Replacement will be required.

If the perforator stops striking, then this is a symptom of striker deformation. Experienced users are advised to chamfer the emery and return it to its original appearance.

In the next video you will find a review of the Hitachi DH 24 PC3 rotary hammer.