1. Common faults and troubleshooting methods of electric hammer drill

            Source: Zhejiang Deshuo Electric Appliance Co., LtdRelease time: 2020-10-15

            Common faults of electric hammers are: the motor does not run after power is connected; abnormal screams occur after power is connected and do not rotate or rotate very slowly; the motor rotates but the bit does not impact or the impact is weakened; the reduction box is overheated; reversing Ring fire or large sparks on the device. We have made the following analysis of these common faults:

            1. The motor does not run after power-on

            Causes: 1. The power supply is broken; 2. The connector is loose; 3. The switch is in poor contact or does not operate; 4. The armature or stator coil is burned out; 5. The stator coil is open; 6. The brush is used up.

            Remedy: 1. Repair the power supply. 2. Check all connectors. 3. Repair or exchange the switch. 4. Exchange the armature or stator coil. 5. If it is broken at the outlet, it can be used after re-soldering, otherwise it must be re-wound. 6. Replace a pair of electric brushes.

            2. After the electric hammer is connected to the electric hammer, the abnormal cry occurs and does not rotate or rotates very slowly

            Causes: 1. The switch contacts are burned out. 2. The mechanical part is stuck or the moving and static parts rub together. 3. The drill bit bites or touches the steel bar. 4. The special nut is loose. 5. A small amount of short circuit or open circuit in the armature. 6. Chips jam when drilling deep holes. 7. The power supply voltage is low.

            Remedy: 1. Repair or replace the switch. 2. Check the mechanical part. 3. Stop forward or choose another drilling position. 4. Tighten the special nut. 5. Repair or replace the armature. 6. Pull out the drill bit to remove debris. 7. Adjust the power supply voltage.

            3. The motor rotates and the drill does not impact or the impact is weakened

            Causes: 1. There is dust and impurities stuck in the piston rotating sleeve to block the air eye. 2. The O-ring seal on the impact piston is damaged or worn.

            Remedy: 1. Clean the mechanical parts, dredge the air eye 2. Replace the O-ring seal.

            Fourth, the gearbox is overheated

            Causes: 1. Lack of grease or dirty grease in the gearbox. 2. The transmission part is not well matched or some sundries fall inside.

            Remedy: 1. Add or replace grease. 2. Check the transmission part or remove impurities.

            5. Excessive heat on the surface of the case

            Causes: 1. Excessive load or dull bit. 2. The winding is wet. 3. Incorrect assembly makes the armature inflexible. 4. The power supply voltage drops.

            Remedy: 1. Reduce the load and sharpen the drill. 2. Dry the windings. 3. Check whether the armature is stuck or wiped the iron core. 4. Adjust the power supply voltage.

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