TROUBLESHOOTING

Before making a request for repairs, check a trouble for yourself. If any abnormality is found, control your machine according to the description of this manual. Never tamper or dismount any part contrary to the description. For repairs, contact Authorized Service Agent or local dealership.

 

State of abnormality

 

 

Probable cause (malfunction)

 

 

Remedy

 

 

 

 

 

 

Failure to operate primer pump

 

 

Push 7 to 10 times.

 

 

 

 

 

 

Low pulling speed of starter rope

 

 

Pull strongly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lack of fuel

 

Feed fuel.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clogged fuel filter

 

Clean

 

 

 

 

 

 

Broken fuel tube

 

Straighten fuel tube

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Deteriorated fuel

 

 

Deteriorated fuel makes starting more difficult.

 

 

 

 

 

 

 

 

 

Replace with new one. (Recommended

 

 

 

 

 

 

 

 

 

replacement: 1 month)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Excessive suction of fuel

 

 

Set throttle lever from medium speed to high

 

 

 

 

 

 

 

 

 

speed, and pull starter handle until engine

 

 

Engine does not start

 

 

 

 

 

starts.

 

 

 

 

 

 

 

If engine will not start still, remove spark plug,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

make electrode dry, and reassemble them as

 

 

 

 

 

 

 

 

 

they originally are. Then, start as specified.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Detached plug cap

 

 

Attach securely

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Contaminated spark plug

 

Clean

 

 

 

 

 

 

Abnormal clearance of spark plug

 

 

Adjust clearance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Other abnormality of spark plug

 

 

Replace

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Abnormal carburetor

 

 

Make request for inspection and maintenance.

 

 

 

 

 

 

Starter rope cannot be pulled

 

 

Make request for inspection and maintenance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Abnormal drive system

 

Make request for inspection and maintenance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Insufficient warm-up

 

Perform warm-up operation

 

 

 

 

 

 

Choke lever is set to “CLOSE” although engine

 

 

Set to “OPEN”

 

 

 

 

 

 

is warmed up

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Clogged fuel filter

 

Clean

 

 

Engine stops soon

 

 

Contaminated or clogged air cleaner

 

Clean

 

 

Engine speed does not increase

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Abnormal carburetor

 

 

Make request for inspection and maintenance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Abnormal drive system

 

Make request for inspection and maintenance

 

 

 

 

 

 

Detached throttle wire

 

 

Attach securely

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Abnormal drive system

 

Make request for inspection and maintenance

 

 

 

 

 

 

 

 

 

 

 

 

Engine does not stop.

 

 

Detached connector

 

 

Attach securely

 

 

 

 

 

 

Abnormal electric system

 

 

Make request for inspection and maintenance.

 

 

 

 

 

 

 

 

 

 

Run engine at idling, and set choke

 

 

 

 

 

 

 

 

lever to CLOSE.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When the engine does not start after warm-up operation:

If there is no abnormality found for the check items, open the throttle by about 1/3 and start the engine.

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Dolmar PB-250.4 instruction manual Troubleshooting, State of abnormality Probable cause malfunction Remedy

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.