How to Repair a Burnt Out Power Hacksaw Motor
Power hacksaws get their power from an electric motor which requires regular maintenance and service. Any repairs can be executed by following some simple steps.
Problems Affecting Motors
Motors are an essential component to electric devices that are used daily. They work efficiently most often, however small problems can grow into larger ones if they are not identified quickly.
A burnt out motor will cause a power hacksaw to freeze up. Prior to freezing up, most motors will show signs of overheating, growing more noisy or have a strong odor.
Repairing a Burnt Out Motor
With the right tools, you can repair a burnt out motor. These would include screwdrivers, wrenches and a multimeter, which reads amperage and voltage.
Below are the steps to repair a burnt out power hacksaw motor.
Step 1 – Test Electricity Flow
Make sure that the power cord wires or the battery (if the hacksaw is cordless) is disconnected from the motor. Depending on the model of hacksaw, you can remove the motor from the assembly to test the motor. If you cannot, the motor can be tested in place.
To test the flow of electricity in the motor, you will use the multimeter. Use the setting of RX1 (resistance times 1) to measure the resistance in ohms. Attach a multimeter probe to the common lead in the motor which is typically white. The other probe should be attached to each of the other wires in the motor.
The multimeter will send an electrical current to wires to get your reading. A low or moderate reading in ohms indicates that the motor is okay. A zero or infinite reading would indicate that there is a problem within the motor’s windings, such as with a burnt out motor.
Step 2 – Service the Drive Mechanism
Using a screwdriver, tighten the setscrew that is attached to the collar or pulley to the shaft. Next, adjust the drive belt at the correct tension so that it fits and rotates correctly with the pulley. Replace the belt if it is worn or damaged. The worm gears on the shaft should be tightened or reduced or replaced. If replacement is necessary, gears come in sets of two and both should be replaced even if only one shows damage or wear.
Step 3 – Service the Gears
Gears can be prone to damage as many can be made of plastic or thin metal which can lead to breakage, chipping or bending.
To access the gears within the motor, you may need to disassemble the motor. Once you have accessed the gears, remove them to inspect them for any damage or wear. Replace gears if needed.
Step 4 – Service the Fan Blades
While you have the motor disassembled, remove and inspect the fan blades. Damaged fan blades should be replaced as they can lead to overheating or serious damage to a motor due to unbalanced spinning.
Step 5 – Reassemble and Test
Reassemble the motor after replacing any necessary components. Reattach the power supply and test the hacksaw. If it still does not work, you may need to replace the motor completely.