Fig. E

10.Check lower guard for proper closing before each use. Do not operate the saw if lower guard does not move freely and close instantly. Never clamp or tie the lower guard into the open posi- tion. If saw is accidentally dropped, lower guard may be bent. Raise the lower guard with the retracting handle and make sure it moves freely and does not touch the blade or any other part, in all angles and depths of cut. To check lower guard, open lower guard by hand, then release and watch guard clo- sure. Also check to see that retracting handle does not touch tool housing. Leaving blade exposed is VERY DANGEROUS and can lead to serious per- sonal injury.

11.Check the operation of the lower guard spring. If the guard and the spring are not operating prop- erly, they must be serviced before use. Lower guard may operate sluggishly due to damaged parts, gummy deposits, or a build-up of debris.

12.Lower guard should be retracted manually only for special cuts such as “plunge cuts” and “compound cuts.” Raise lower guard by retract- ing handle and as soon as blade enters the material, the lower guard must be released. For all other sawing, the lower guard should operate automatically.

13.Always observe that the lower guard is covering the blade before placing saw down on bench or floor. An unprotected, coasting blade will cause the saw to walk backwards, cutting whatever is in its path. Be aware of the time it takes for the blade to stop after switch is released. Before setting the tool down after completing a cut, be sure that the lower guard has closed and the blade has come to a com- plete stop.

14.Use the appropriate riving knife for the blade being used. For the riving knife to work, it must be thicker than the body of the blade but thinner than the tooth set of the blade.

15.Adjust the riving knife as described in this instruction manual. Incorrect spacing, positioning and alignment can make the riving knife ineffective in preventing kickback.

16.Always use the riving knife except when plunge cutting. Riving knife must be replaced after plunge cutting. Riving knife causes interference during plunge cutting and can create kickback.

17.For the riving knife to work, it must be engaged in the workpiece. The riving knife is ineffective in preventing kickback during short cuts.

18.Do not operate the saw if riving knife is bent. Even a light interference can slow the closing rate of a guard.

19.Use extra caution when cutting damp wood, pressure treated lumber, or wood containing knots. Adjust speed of cut to maintain smooth advancement of tool without decrease in blade speed.

20.Avoid Cutting Nails. Inspect for and remove all nails from lumber before cutting.

21.Place the wider portion of the saw base on that part of the workpiece which is solidly supported, not on the section that will fall off when the cut is made. As examples, Fig. E illustrates the RIGHT way to cut off the end of a board, and Fig. F the WRONG way. If the workpiece is short or small, clamp it down. DO NOT TRY TO HOLD SHORT PIECES BY HAND! (Fig. E & F)

Fig. F

22.Never attempt to saw with the circular saw held upside down in a vise. This is extremely danger- ous and can lead to serious accidents. (Fig. G)

Fig. G

23.Some material contains chemicals which may be toxic. Take caution to prevent dust inhalation and skin contact. Follow material supplier safety data.

24.Do not stop the blades by lateral pressure on the saw blade.

25.Always use blades recommended in this manual. Do not use any abrasive wheels.

5143R, 5103R, 5703R, 5903R specifications

Makita, a renowned name in power tools, offers a range of high-performance electric saws that cater to professional and DIY enthusiasts alike. Among its standout models are the Makita 5903R, 5703R, 5103R, and 5143R. Each of these saws is designed with precision, power, and efficiency in mind, making them suitable for various cutting applications.

The Makita 5903R is a powerful circular saw that boasts a robust 15-amp motor, capable of delivering cutting speeds of up to 5,800 RPM. One of its main features is the ergonomically designed handle, which allows for easy maneuverability and reduced fatigue during prolonged use. The 5903R also includes a large, clear sightline for precise cutting, alongside a base that is engineered for stability. Its bevel capacity reaches up to 45 degrees, allowing for versatile cutting angles, making it ideal for framing and roofing projects.

Moving on to the Makita 5703R, this model is also equipped with a potent 15-amp motor and offers a more compact design without sacrificing power. The 5703R features a thin kerf blade that reduces friction and increases efficiency, leading to smoother cuts. Additionally, its lightweight build makes it easier to handle, particularly in tight spaces. The saw’s precision balanced design helps in minimizing user fatigue, making it a favorite for extended work sessions.

The Makita 5103R is known for its high cutting capacity and excellent cutting efficiency. This model features a 15-amp motor and a maximum cutting depth of 3-13/16 inches at 90 degrees, making it perfect for heavy-duty applications. The built-in electronic speed control maintains a constant speed under load, ensuring consistent performance. Moreover, the saw is equipped with a large in-line rear handle for added comfort and control.

Finally, the Makita 5143R is a superior circular saw designed specifically for heavy-duty applications. This model is powered by a 15-amp motor and boasts a remarkable cutting depth of 4-5/8 inches at 90 degrees, suitable for cutting through thick materials. It features a durable aluminum die-cast base for increased stability during cutting, and its advanced anti-kickback design enhances user safety. The 5143R also comes with a soft start feature, which gradually increases the speed for smoother operation.

In summary, the Makita 5903R, 5703R, 5103R, and 5143R models showcase a blend of power, precision, and user-oriented features. Whether you're framing, roofing, or tackling heavy-duty projects, these saws have the technology and characteristics to handle diverse cutting tasks efficiently.