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

 

 

 

 

 

starts. Once engine starts, cutter blade

Engine does not start

 

starts rotating. Pay

full attention to cutter

 

blade.

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

Engine stops soon

 

 

 

Clogged fuel filter

Clean

 

Engine speed does not increase

 

 

 

 

Contaminated or clogged air cleaner

Clean

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Abnormal carburetor

Make request for inspection and maintenance

 

 

 

 

 

 

 

 

 

 

Abnormal drive system

Make request for inspection and maintenance

 

 

 

 

 

 

 

Cutter blade does not rotate

Loosened cutter blade-tightening nut

Tighten securely

 

 

 

 

 

 

 

 

 

 

 

 

Twigs caught by cutter blade or

Remove foreign matter

 

 

 

 

dispersion-preventing cover

 

 

 

 

 

 

 

Stop engine immediately

 

Abnormal drive system

Make request for inspection and maintenance.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Main unit vibrates abnormally.

Broken, bent or worn cutter blade

Replace cutter blade

 

 

 

 

 

 

 

 

 

 

 

 

Loosened cutter blade-tightening nut

Tighten securely

 

 

 

 

 

 

 

 

 

 

 

 

Shifted convex part of cutter blade and cutter

Attach securely

 

 

 

 

 

blade support fitting

 

 

Stop engine immediately

 

 

 

 

 

 

 

 

Abnormal drive system

Make request for inspection and maintenance

 

 

 

 

 

 

 

 

 

 

 

Cutter blade does not stop immediately.

High idling rotation

Adjust

 

 

 

 

 

 

 

 

 

 

 

 

Detached throttle wire

Attach securely

 

 

Stop engine immediately

 

 

 

 

 

 

 

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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Makita EM4251CA, EM4250CA manual Troubleshooting

EM4250, EM4251, EM4250CA, EM4251CA specifications

The Makita EM4251CA and EM4250CA models are the latest additions to Makita's robust range of outdoor power equipment, specifically designed for professional landscapers and gardening enthusiasts. These brushcutters are known for their powerful performance, ease of use, and advanced technologies that enhance efficiency and durability.

The Makita EM4251CA features a displacement of 25.4cc, while the EM4250CA is slightly larger, with a 30.5cc engine. Both models are equipped with a high-performance 2-stroke engine that delivers impressive power and torque for tackling thick grass, weeds, and underbrush. The engines are designed for low emissions and fuel consumption, contributing to environmentally friendly operation while maintaining compliance with the latest regulatory standards.

One of the standout features of these brushcutters is the Easy Start System, which significantly reduces the effort required to start the engine. This system incorporates a spring-assisted starter that provides a smooth and reliable start every time. Additionally, the models offer a semi-automatic choke system that adjusts fuel flow for optimal performance in varying conditions.

For user comfort, the EM4251CA and EM4250CA are designed ergonomically, with a lightweight construction that enhances maneuverability without compromising strength. The adjustable bike handle provides solid control during operation, minimizing user fatigue during lengthy tasks. Both models also feature anti-vibration technology that reduces vibrations transmitted to the user, ensuring a more comfortable experience.

A robust and durable design is another hallmark of Makita's brushcutters. The fuel tank is constructed from high-quality materials to resist impacts and environmental factors, while the shaft is reinforced to withstand rigorous use. The inclusion of a reinforced cutter head allows for versatile cutting options, accommodating both trimmer line and metal blades for various applications.

For added convenience, these models are equipped with a soft grip handle that provides comfort during extended use, alongside a quick-release harness that allows for swift transitions between tasks. Overall, the Makita EM4251CA and EM4250CA brushcutters represent a blend of power, efficiency, and user-oriented design, making them ideal tools for anyone serious about maintaining their outdoor spaces.

With their mix of advanced technology and practical features, the EM4251 and EM4250 models ensure that users can tackle tough landscaping jobs with confidence and ease, making them invaluable assets for both professionals and hobbyists alike.