P 14/ 19

Repair

[4]DISASSEMBLY/ASSEMBLY

[4]-8. Engine

DISASSEMBLING

(1)Remove Clutch complete and Clutch drum. Refer to [4]-3.

(2)Remove Flywheel. Refer to [4]-4. If necessary, remove Ignition coil.

(3)Loosen five M6x25 Hexalobular socket head bolts, then remove Cutting arm from Cylinder block complete. (Fig. 48)

(4)Remove Exhaust muffler from Cylinder block complete.

Note: Although Spark arrester can be removed from Exhaust muffler, it is not permitted to replace Spark arrester only because it functions as the integrated part with Exhaust muffler.

(5) Remove Oil case from Cylinder block complete. (Fig. 49)

Fig. 48

 

Fig. 49

 

Exhaust

 

 

muffler

Cylinder head

Cylinder block complete

 

 

complete

 

 

 

 

Cylinder block

 

 

Cylinder

 

 

block

 

 

complete

 

Spark arrester

Crank case

 

Oil case

 

 

M6x25 Hexalobular

Cutting arm

M5x16 Hexalobular

socket head bolt (4 pcs.)

socket head bolt (5 pcs.)

 

 

 

Note: Unless you repair Exhaust valves, Cam lifters, and Rocker arms, do the following steps. It is not necessary to remove Cylinder block from Crank case (Fig. 49)/ Carburetor from Cylinder block complete (Refer to Fig. 34.)

(6)Remove two M6x20 Hexalobular socket head bolts on the upper side of Exhaust muffler.

Remove two M5x25 Hexalobular socket head bolts then separate Rocker cover complete from Cylinder head complete. (Fig. 50)

(7)Loosen Hose clamp then remove Suction line from Cylinder head complete. (Refer to Fig. 41)

(8)Remove Cylinder head complete from Cylinder block, then pull out two Push rods. (Fig. 51)

Note: Do not failure to mix them up. It is recommend to distinguish Exhaust push-rod and Intake push-rod.

(9)Remove Cam gear cover (Fig. 52).

(10)Remove Cam lifter L and Cam lifter R. Then, remove Cam gear complete by pulling out Pin 5. (Fig. 53)

Fig. 50

Fig. 51

Rocker cover complete

M5x25 Hexalobular

socket head bolt

(2 pcs.)

M6x20 Hexalobular socket head bolt (2 pcs.)

Do not touch this M6x20

Hexalobular socket head bolt.

M6x35 Hexalobular socket head bolt (4 pcs.)

Cylinder head complete

Push rod (for exhaust system) Push rod (for intake system)

Cylinder block

Fig. 52

Cam gear cover

M5x16 Hexalobular socket head bolt (4 pcs.)

Fig. 53

 

 

Cam lifter L Cam lifter R

Cam gear assembly

 

Cam gear

Fly weight

 

complete

 

 

 

Cam gear plate

Pin 5

 

Torsion spring 9

 

 

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Image 14
Makita EK7651H, EK7650H dimensions Engine
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EK7650H, EK7651H specifications

The Makita EK7650H and EK7651H are robust and powerful cut-off saws designed for professional contractors and construction workers. These models are ideal for cutting through concrete, masonry, asphalt, and other tough materials with precision and efficiency. Their advanced engineering and innovative features set them apart in the competitive landscape of power tools.

One of the standout features of both models is the 4-stroke engine technology, which provides a significant reduction in emissions and noise compared to traditional 2-stroke engines. This makes them environmentally friendly while also allowing for longer operating times without the need for frequent fuel refills. The powerful 6.6 HP engine delivers exceptional cutting performance, enabling users to tackle even the most challenging jobs.

The EK7650H and EK7651H are equipped with a “Fast Start” technology that allows for easy starting, reducing the effort required to get the saw up and running. This is especially useful for users who need to work quickly and efficiently on-site. Additionally, the saws feature an automatic choke that enhances starting reliability in various weather conditions.

Comfort and usability are central to the design of these models. The dual anti-vibration technology minimizes vibrations during operation, significantly reducing user fatigue. The ergonomic handle provides a secure grip, allowing for greater control during cutting tasks. This is particularly beneficial for prolonged use in demanding work environments.

Another key characteristic of the Makita EK7650H and EK7651H is their versatility. They are designed to accommodate various blade sizes, which gives users flexibility in choosing the right blade for specific applications. The saws also feature an integrated dust management system that helps keep the work area clean, enhancing visibility and safety.

Both models come with an adjustable cutting depth feature, enabling users to achieve precise cuts for various materials. The easy-to-access air filter and fuel system ensure simple maintenance, extending the life of the saws.

In summary, the Makita EK7650H and EK7651H are powerful, efficient, and user-friendly cut-off saws that cater to the needs of professional users. With their advanced features, including a 4-stroke engine, ergonomic design, and versatility in blade sizes, these saws are indispensable tools for anyone looking to perform cutting tasks with precision and ease.
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