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Hitachi DH 40FB Maintenance and Inspection, Inspecting the drill bits, Maintenance of the motor

Models: DH 40FB

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MAINTENANCE AND INSPECTION

WARNING: Be sure to switch power OFF and disconnect the plug from the receptacle during maintenance and inspection.

1.Inspecting the drill bits

Since use of a dull tool will cause motor malfunctioning and degraded efficiency, replace the drill bit with a new one or resharpening without delay when abrasion is noted.

2.Inspecting the mounting screws

Regularly inspect all mounting screws and ensure that they are properly tightened. Should any of the screws be loose, retighten them immediately.

WARNING: Using this rotary hammer with loosen screws is extremely dangerous.

3.Maintenance of the motor

The motor unit winding is the very “heart” of the power tool. Exercise due care to ensure the winding does not become damaged and/or wet with oil or water.

4.Inspecting the carbon brushes: (Fig. 18)

The motor employs carbon brushes which are consumable parts. When they become worn to or near “wear limit”, it could result in motor trouble. When an auto-stop carbon brush is equipped, the motor will stop automatically. At that time, replace both carbon brushes with new ones which have the same carbon brush Nos. shown in the figure.

In addition, always keep carbon brushes clean and ensure that they slide freely within the brush holders.

CAUTION: Using this rotary hammer with a carbon brush which is worn in excess of the wear limit will damage the motor.

Wear limit

No. of carbon brush

73

0.28" (7 mm)

0.67" (17 mm)

Fig. 18

NOTE: Use HITACHI carbon brush No.73 indicated in Fig. 18

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Hitachi DH 40FB instruction manual Maintenance and Inspection, Inspecting the drill bits, Inspecting the mounting screws
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DH 40FB specifications

The Hitachi DH 40FB is a powerful and versatile rotary hammer designed for heavy-duty applications in construction, renovation, and maintenance tasks. As a leader in the power tools industry, Hitachi has engineered the DH 40FB to meet the demands of professionals who require both performance and precision in their work.

One of the main features of the Hitachi DH 40FB is its robust motor, delivering a striking force of up to 8.2 joules, making it ideal for drilling and chiseling through concrete, masonry, and other tough materials. This high-impact energy ensures that users can complete their tasks efficiently, whether it’s drilling holes for anchor bolts or chiseling out old material for renovation projects. The hammer offers drilling capacities of up to 40 mm in concrete, allowing for versatile applications depending on the specific needs of the job site.

Another technology that sets the Hitachi DH 40FB apart is its use of a unique vibration-dampening system. This feature significantly reduces the amount of vibration that is transmitted to the user, enhancing comfort and minimizing fatigue during prolonged use. This is especially beneficial for professionals who frequently operate heavy tools, as it helps maintain productivity without compromising on safety and ergonomics.

The DH 40FB also incorporates a user-friendly design that includes an easy-to-access switch for selecting between hammer-only and rotary hammer modes. This versatility enables users to switch effortlessly between different applications, optimizing the tool’s efficiency for various tasks like wall chasing or drilling into steel.

In terms of build quality, the Hitachi DH 40FB is designed for durability. Its aluminum housing protects the internal components from dust and debris, which is critical in harsh job site environments. Additionally, the tool features a rotating brush system that maintains equal power in both forward and reverse modes, along with a rugged case that aids in transportation and storage.

Overall, the Hitachi DH 40FB stands out as a reliable and efficient tool, combining power, comfort, and advanced features that cater to the rigorous demands of the construction industry. With its robust capabilities and modern engineering, it is a valuable asset for any professional looking to enhance productivity on the job site. Whether drilling or chiseling, the DH 40FB continues to prove itself as a trusted choice among power tools.