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Common power tool maintenance steps
Date:2021/6/13 Publisher:hx2019 Hits:1514
When diagnosing the fault of an electric tool, you should first make a preliminary analysis and judgment based on the fault phenomenon, and then conduct special targeted inspections and measurements to determine the nature of the fault and the point of the fault.
Regardless of the fault, do not rush to disassemble the power tool for internal inspection. You should first perform visual inspection and preliminary mechanical fault diagnosis. The specific content is as follows:
1. The power plug is stagnant and broken, and whether the copper pillar of the plug is loose
2. Whether the power cord is damaged or broken
3. Whether the switch is broken, whether the action is flexible, whether the opening and closing sound is normal
4. Whether the casing is damaged, whether the screws in various parts are loose
5. Turn the tool upside down and gently shake it to check whether there are any parts or sundries inside the tool
6. Rotate or pull the movable part along the direction of movement by hand or other auxiliary tools. If there is no obstruction, uneven tightness, and no noise, it means that there is no mechanical failure. If the rotation is difficult, it means that there is a mechanical failure. Disintegration for inspection
Before disassembly, the circuit resistance can be measured with a multimeter to determine whether there is an open circuit fault, and the electric tool with a metal shell can be measured with a megohmmeter to determine whether the insulation is good to determine whether there is a leakage fault.
For single-phase series-excited electric tools that can replace the brush without disassembling, check the wear of the brush first
After the disassembly, mechanical failures are mainly checked by visual inspection, and electrical failures should be detected with electrical instruments according to the failure phenomenon.
After finding the cause of the failure, repair or replace the faulty parts. When some parts cannot be repaired, they must be replaced. Currently, the power tools produced are usually accompanied by the exploded view of the parts and the name and model list in the manual. The user is buying It should be kept properly when purchasing each part. It is best to go to the original manufacturer to make sure that the performance of the model is completely consistent.
Electric tool maintenance shall not arbitrarily change the original design parameters of the tool, shall not use substitute materials with lower performance than the original performance, shall not replace parts that do not conform to the original specifications, and shall not miss the installation or arbitrarily dismantle the insulating gasket and casing in the tool.
The insulation resistance of electric tools should be measured after overhaul, and a 500V megger should be used for measurement. The insulation resistance of class I electric tools should not be less than 2MΩ, otherwise it should be dried.
Electric tools should be subjected to AC withstand voltage test after the electrical insulation part is repaired, such as replacing and repairing insulating gaskets, bushings and motor windings, etc.