Makita Cordless Concrete Vibrator

Instruction Manual

Product Information

This manual provides essential information for the safe and effective use of Makita Cordless Concrete Vibrators, models DVR340, DVR350, DVR440, DVR450, and DVR850.

The tool is designed for removing air bubbles from concrete during casting operations.

Specifications

Model	DVR340	DVR440	DVR350	DVR450	DVR850
Vibrations per minute (min⁻¹)	12,500	12,500	13,000	13,000	12,500
Vibration amplitude	1.0 mm
Vibration head (diameter x length)	25 mm x 221 mm
Flexible shaft assembly length	800 mm	1,200 mm	800 mm	1,200 mm	2,400 mm
Overall length	1,083 mm	1,483 mm	1,083 mm	1,483 mm	2,683 mm
Net weight	3.1 kg	3.6 kg	3.0 kg	3.5 kg	5.2 kg
Rated voltage	D.C. 14.4 V	D.C. 18 V

Specifications are subject to change without notice due to Makita's ongoing research and development program. Specifications and battery cartridges may differ by country. Weight, with battery cartridge, determined according to EPTA-Procedure 01/2003.

Symbols

? Read instruction manual.
☔❌ Do not use the tool in the rain.
?❌ Do not clean the tool with water.
Ni-MH Li-ion: For EU countries, do not dispose of electric equipment or battery pack with household waste material. Follow European Directives for waste electric and electronic equipment and batteries.

Safety Warnings

General Power Tool Safety Warnings

WARNING: Read all safety warnings and instructions. Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.

Save all warnings and instructions for future reference.

Cordless Concrete Vibrator Safety Warnings

Always keep your hands and face away from the vibrating head when operating.
Switch off the tool immediately if you notice abnormal noise or something faulty during operation.
Inspect the tool carefully for breakage, cracks or deformation if you accidentally drop it or strike it against something.
Do not carry the tool with finger on the switch.
Do not set the tool down and switch it on. The vibrating head may whip around out of control and cause an accident.
Be careful not to allow water, wet concrete or the like to get into the tool. Do not let the tool fall into wet concrete.
Insert the vibrating head carefully between iron/steel frames or reinforcing rods not to come in contact with them.
Do not crush or twist the flexible hose.
Do not overly bend the flexible hose.
Use a wet cloth or the like to carefully wipe off any wet concrete left on the tool after use. Pay extra attention to cleaning vents, switch area, and cover openings.
Do not use the tool in the rain. Do not clean the tool in water.

WARNING: DO NOT let comfort or familiarity with product (gained from repeated use) replace strict adherence to safety rules for the subject product. MISUSE or failure to follow the safety rules stated in this instruction manual may cause serious personal injury.

Important Safety Instructions for Battery Cartridge

Before using battery cartridge, read all instructions and cautionary markings on (1) battery charger, (2) battery, and (3) product using battery.
Do not disassemble battery cartridge.
If operating time has become excessively shorter, stop operating immediately. It may result in a risk of overheating, possible burns, and even an explosion.
If electrolyte gets into your eyes, rinse them out with clear water and seek medical attention right away. It may result in loss of your eyesight.
Do not short the battery cartridge:

Do not touch the terminals with any conductive material.
Avoid storing battery cartridge in a container with other metal objects such as nails, coins, etc.
Do not expose battery cartridge to water or rain.

A battery short can cause a large current flow, overheating, possible burns, and even a breakdown.
Do not store the tool and battery cartridge in locations where the temperature may reach or exceed 50 °C (122 °F).
Do not incinerate the battery cartridge even if it is severely damaged or is completely worn out. The battery cartridge can explode in a fire.
Be careful not to drop or strike battery.
Do not use a damaged battery.
The contained lithium-ion batteries are subject to the Dangerous Goods Legislation requirements. For commercial transports e.g. by third parties, forwarding agents, special requirements on packaging and labeling must be observed. Consult an expert for hazardous material preparation and observe national regulations.
Tape or mask off open contacts and pack up the battery in such a manner that it cannot move around in the packaging.
Follow your local regulations relating to disposal of battery.

CAUTION: Only use genuine Makita batteries. Use of non-genuine Makita batteries, or batteries that have been altered, may result in the battery bursting causing fires, personal injury and damage. It will also void the Makita warranty for the Makita tool and charger.

Tips for Maintaining Maximum Battery Life

Charge the battery cartridge before it is completely discharged. Always stop tool operation and charge the battery cartridge when you notice less tool power.
Never recharge a fully charged battery cartridge. Overcharging shortens the battery service life.
Charge the battery cartridge with room temperature at 10 °C - 40 °C (50 °F - 104 °F). Let a hot battery cartridge cool down before charging it.
Charge the battery cartridge if you do not use it for a long period (more than six months).

Functional Description

Installing or Removing Battery Cartridge

Always ensure the tool is switched off and the battery cartridge is removed before adjusting or checking function on the tool.
Always switch off the tool before insertion or removal of the battery cartridge.
To remove the battery cartridge, first open the battery cartridge cover. To open the cover, press its recessed part and pivot it with the recessed part depressed. Then withdraw it from the tool while sliding the button on the front of the cartridge.
To insert the battery cartridge, align the tongue on the battery cartridge with the groove in the housing and slip it into place. Always insert it all the way until it locks in place with a little click. If you can see the red part on the upper side of the button, it is not locked completely. Insert it fully until the red part cannot be seen. If not, it may accidentally fall out of the tool, causing injury to you or someone around you.
Do not use force when inserting the battery cartridge. If the cartridge does not slide in easily, it is not being inserted correctly.

Indicating Remaining Battery Capacity

For battery cartridges with the indicator: Press the check button to indicate the remaining battery capacity. The indicator lamps light up for few seconds.

Indicator Lamps	Remaining Capacity
Lit	75% to 100%
Off	50% to 75%
Blinking	25% to 50%
(No lights)	0% to 25%
↑↓ (Flashing)	Charge the battery.
↑↓ (Steady)	The battery may have malfunctioned.

Note: Depending on the conditions of use and the ambient temperature, the indication may differ slightly from the actual capacity.

Switch Action

Always check to see that the switch lever actuates properly and returns to the "OFF" position when released before inserting the battery cartridge into the tool.
To start the tool, simply pull the switch lever.
Release the switch lever to stop.
The switch lever can be pulled from either top or back side of the tool.

Operation

Hold the tool straight when inserting/operating.
Use the tool within the effective vibrations range at equidistant intervals. The effective air bubble removal range is about ten times diameter of the vibrating head, or around 250 mm.
Do not use this tool to move concrete within a form. The mortar will just move away and the coarse aggregate will remain, causing segregation.

Effective Leveling and Removal of Air Bubbles

Removal of the air bubbles is complete after you have worked the tool throughout each effective range, the concrete stops shrinking, and the mortar has risen evenly to the surface, giving off a light appearance. Gently remove the operating tool not to leave holes.
Vibrating too long in a single place causes concrete segregation.
When the coarse aggregates segregates when placing concrete, shovel out the coarse aggregate and put it where there is plenty of mortar. Then use the tool on it. Do not leave coarse aggregate in the segregated condition.
When concreting a slope site, always pour from the bottom at the beginning. This way the weight of the freshly poured concrete and vibration will lead to effective removal of air bubbles. Conversely, if the pouring is done first from above, the mortar will separate and eventually slide to the bottom.

Maintenance

CAUTION: Always be sure that the tool is switched off and the battery cartridge is removed before attempting to perform inspection or maintenance.

Never use gasoline, benzine, thinner, alcohol or the like. Discoloration, deformation or cracks may result.
To maintain product SAFETY and RELIABILITY, repairs, any other maintenance or adjustment should be performed by Makita Authorized Service Centers, always using Makita replacement parts.

Optional Accessories

CAUTION: These accessories or attachments are recommended for use with your Makita tool specified in this manual. The use of any other accessories or attachments might present a risk of injury to persons. Only use accessory or attachment for its stated purpose.

If you need any assistance for more details regarding these accessories, ask your local Makita Service Center.
Makita genuine battery and charger.
Some items in the list may be included in the tool package as standard accessories. They may differ from country to country.

For contact information and website, please refer to the last page.

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