2. Cleaning of air cleaner

WARNING ： INFLAMMABLES STRICTLY PROHIBITED

Interval of Cleaning and Inspection: Daily (every 10 operating hours)

(1)Remove the air cleaner cover-fixing bolts.

(2)Pull the cover lower side and detach the air cleaner cover.

(3)Turn the choke lever to the full close side, and keep the carburetor off from dust or dirt.

(4)If oil adheres to the element (sponge), squeeze it firmly.

(5)For heavy contamination:

1)Remove the element (sponge), immerse it in warm water or in water-diluted neutral detergent, and dry it completely.

2)Clean the element (felt) with gasoline, and dry it completely.

(6)Before attaching the element, be sure to dry it completely. Insufficient drying of the element may lead to difficult startup.

(7)Wipe out with waste cloth, oil adhering around the air cleaner cover and plate breather.

(8)Immediately after cleaning is finished, attach the air cleaner cover and tighten it with fixing bolts. (In remounting, first place the upper claw, and then the lower claw.)

Plate

Element (sponge)

Air cleaner cover

Breather Part

Element (felt)

Fixing bolt

Pick this part and remove the element (felt).

DANGER

•Clean the element several times a day, if excessive dust adheres to it.

•If operation continues with the element remaining not cleared of oil, oil in the air cleaner may fall outside, resulting in oil contamination.

3.Checking the spark plug

(1)Opening/closing the plug cover

When opening the cover, apply fingers to the main handle and plug cover projection as shown in the figure right. Push up the projection and slide the cover in the “OPEN” direction.

When closing the cover, slide the cover in the “CLOSE” direction till the click under the plug cover projection rides over the engine cover. Finally, push in the projection.

(2) Removing the spark plug

Use an attached box wrench to remove or install the spark plug.

(3) Checking the spark plug

The clearance between two electrodes of spark plug (see the figure left) is 0.7 to 0.8 mm. Adjust to the correct clearance when it is too wide or too narrow.

Clean thoroughly or replace the spark plug if it has accumulated carbon or contaminated.

(4) Replacing the spark plug

For replacement, use NGK-CMR6A.

(1)

(2)

(3)

Lateral electrode (-)

Electrode clearance

0.7- 0.8 mm

(0.028-0.031 in)

15

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Dolmar PB-250.4 instruction manual Cleaning of air cleaner, Checking the spark plug
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PB-250.4 specifications

The Dolmar PB-250.4 is a robust and efficient backpack blower designed for both commercial and residential use. Known for its powerful performance and user-friendly operation, the PB-250.4 stands out as a reliable choice for landscaping professionals and homeowners alike.

One of the main features of the Dolmar PB-250.4 is its impressive engine. Equipped with a 24.5 cc, 2-stroke engine, it delivers a commendable airflow of up to 700 CFM (cubic feet per minute) and a maximum airspeed of 160 mph. This power allows users to tackle heavy debris, leaves, and grass clippings with ease, making yard maintenance swift and effective.

The design of the PB-250.4 emphasizes comfort and ergonomic use. It comes with a padded shoulder harness, which distributes the weight evenly and reduces fatigue during extended use. Additionally, the adjustable throttle and ergonomic handle provide better control and precision, enhancing the overall user experience.

The technology behind the Dolmar PB-250.4 reflects a commitment to efficiency and environmental responsibility. The blower incorporates the advanced 2-stroke engine technology, which not only provides superb power but also integrates a clean-air system that reduces emissions, making it a more eco-friendly option compared to older models.

Easy starting is another characteristic that sets the PB-250.4 apart. The blower is equipped with a reliable starting system that minimizes resistance for an effortless start, even in cold conditions. This feature is particularly beneficial for users who may need to start and stop the blower frequently throughout their tasks.

Maintenance of the PB-250.4 is straightforward, thanks to its accessible components and design features. The air filter can be easily cleaned and replaced, ensuring that the engine runs optimally with minimal downtime.

In summary, the Dolmar PB-250.4 is a high-performance backpack blower that combines power, efficiency, and comfort in a user-friendly package. Its robust engine, ergonomic design, and commitment to low emissions make it an excellent choice for anyone looking to maintain their outdoor spaces effectively. Whether for professional landscaping or home use, the PB-250.4 delivers the performance and reliability users demand.
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