6.Once the cut is completed, turn off the Saw by releasing the Trigger Lock/Switch (103) and unplug the unit. Do not attempt to remove the workpiece until the Cut- Off Wheel (56) has stopped moving.

7.Lock down the Saw (see Locking Down the Saw on page 12).

INSPECTION, MAINTENANCE, AND CLEANING

1.WARNING! Make sure the Power Switch (103) of the Saw is in its “OFF” position and that the tool is unplugged from its electrical outlet before performing any inspection, maintenance, or cleaning procedures.

2.BEFORE EACH USE, inspect the general condition of the Saw. Check for loose screws, misalignment or binding of moving parts, cracked or broken parts, dam- aged electrical wiring, and any other condition that may affect its safe operation. If abnormal noise or vibration occurs, have the problem corrected before further use. Do not use damaged equipment.

3.Daily, while wearing gloves, use a soft brush, cloth, or vacuum, to remove all dust and debris from the Saw. Then, use a high quality, lightweight machine oil to lubricate all moving parts, except the Cut-Off Wheel (56).

Note: If the motor performance decreases or stops, it may be necessary to replace the Carbon Brushes (67). Refer to FIGURES 8 and 9.

4.The Carbon Brushes (67) are located on each side of the Motor Housing (see FIGURE 8). To replace the Carbon Brushes (67), use a standard screwdriver (not included) to open the two Carbon Brush Covers (68). Remove the Carbon Brush- es (67). If they are less than half their original size, replace them. If replacing, you must replace both at the same time. If they are larger than half their original size, they can be cleaned by rubbing them with a pencil eraser. When returning them to their compartment, make sure the carbon portions of the Carbon Brush- es (67) contact the Motor Armature (85), and the springs face away from the Motor. Also, make sure the springs operate freely. After cleaning or replacement, replace the Carbon Brush Covers (68) and tighten securely. Do not over- tighten. Note: New Carbon Brushes (67) tend to arc or spark when first used until they wear and conform to the Motor Armature (85).

FIGURE 8

Carbon Brush

Cover (68)

FIGURE 9

Carbon Brush

 

 

Cover (68)

SKU 91938 For technical questions, please call 1-800-444-3353.

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Harbor Freight Tools 91938 operating instructions INSPECTION, MAINTENANCE, and Cleaning
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91938 specifications

Harbor Freight Tools is known for providing a wide range of affordable tools and equipment for both professionals and DIY enthusiasts. One of its most notable offerings is the 91938, a versatile and highly useful tool that is essential for a variety of applications.

The Harbor Freight Tools 91938 is a 7-inch variable speed angle grinder, designed to provide high performance and reliability. Its powerful 4.3 amp motor allows for a maximum speed of 11,000 RPM, making it suitable for cutting, grinding, and polishing a variety of materials including metal, wood, and concrete. This high-speed capability ensures efficiency while maximizing productivity during use.

One of the main features of the 91938 is its adjustable speed control. This variable speed function allows users to tailor the tool's performance to their specific needs, whether they are working on delicate tasks that require precision or heavy-duty applications that demand power. The ergonomic design and rubberized grip handle provide comfort during extended use, reducing fatigue and enhancing control.

Safety is a crucial aspect of any power tool, and the Harbor Freight Tools 91938 does not disappoint. It is equipped with a safety guard that prevents debris from flying towards the user, as well as a spindle lock that facilitates easy wheel replacement. Additionally, the tool’s lightweight construction makes it easy to maneuver, even in tight spaces.

The versatility of the 91938 is further enhanced by its compatibility with a variety of grinding and cutting wheels. This adaptability allows users to tackle a wide range of jobs, making it an excellent choice for home improvement projects, automotive repairs, and metalworking tasks.

Moreover, Harbor Freight is recognized for its commitment to value, and the 91938 is no exception. Offering high-quality performance at a competitive price point, it is an attractive option for those looking to invest in a reliable tool without breaking the bank.

In conclusion, the Harbor Freight Tools 91938 angle grinder stands out for its powerful motor, variable speed control, safety features, and versatility. Whether you are a seasoned professional or a dedicated DIYer, this tool can serve as a valuable addition to your toolkit, making it easier to complete a variety of tasks with precision and ease.
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