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OK. Let's talk about what problems may occur when using impact drills, how to use them correctly, and how to repair and maintain them.

The correct use of impact drills:

① Before operation, you must check whether the power supply is compatible with the conventional rated 220V voltage on the power tool, so as not to be wrongly connected to the 380V power supply.

② Before using the impact drill, carefully inspect the insulation protection, auxiliary handle, and depth gauge adjustments. Ensure that all screws are tight and secure to guarantee safe operation.

③ Impact drills must be used within the permissible range of φ6-25mm, depending on the material requirements for alloy steel impact drills or general-purpose perforating drills. It is strictly prohibited to exceed this range, as doing so can lead to damage and safety hazards.

④ The impact drill's power cord should be properly protected and never left on the ground to prevent rolling or cutting. Additionally, avoid exposing the cord to oil or water to prevent corrosion and damage.

⑤ When using impact drills, ensure they are equipped with a power socket leakage switch and regularly check that the power cord is intact. If you notice any leakage, unusual vibrations, excessive heat, or strange noises while operating the drill, immediately stop use and consult a qualified electrician for prompt inspection and repair.

⑥ When replacing the drill bit, always use a specialized bit holder and a drill locking key. Avoid using non-specialized tools to adjust the impact drill, as this can lead to improper functioning and safety issues.

⑦ When using the impact drill, avoid applying excessive force or operating at an angle. Before starting, ensure that the appropriate bit is securely tightened and adjust the depth settings. Maintain a vertical and balanced posture while operating, applying consistent, even pressure. Avoid forcing the use of oversized drill bits.

⑧ Skillfully operate the forward and reverse steering control mechanism to effectively loosen and tighten screws, as well as perform tapping and other functions with precision.

Multi-function impact drill common failure repair:

1. Electric hammer motor does not run after connecting the power 

① Reason: the power supply is broken; repair method: repair the power supply of the impact drill.

② Reason: loose joints; repair method: check all the joints.

③ Reason: switch poor contact or inactivity; maintenance method: repair or switch.

④ Reason: armature or stator coil burnt out; repair method: replace armature or stator coil.

⑤ Reason: stator coil broken; repair method: if broken at the outlet, it can be rewelded and used, otherwise it must be rewound.

⑥ Reason: Brushes are used up; Repair method: Replace one set of brushes.

2. The electric hammer makes an abnormal sound after being powered on and does not rotate or rotates very slowly.

①Reason: The switch contacts are burned out; Maintenance method: Repair or replace the switch.

②Reason: The mechanical part is stuck or the moving and static parts are rubbed against each other; Maintenance method: Check the mechanical part.

③Reason: The drill bit bites or touches the steel bar; Maintenance method: Stop moving forward or choose another drilling position.

④Reason: The armature or stator coil is burned out; Maintenance method: Replace the armature or stator coil.

⑤Reason: The armature is short-circuited or open-circuited in a small amount; Maintenance method: Repair or replace the armature.

⑥Reason: Chips are stuck when drilling deep holes; Maintenance method: Pull out the drill bit to remove the chips.

⑦Reason: Low power supply voltage; Maintenance method: Adjust the power supply voltage.

3. The motor rotates but the drill bit does not impact or the impact force is weakened

①Reason: Dust and impurities are stuck in the piston sleeve, causing the air hole to be blocked; maintenance method: clean the mechanical part and clear the air hole.

②Reason: The O-ring on the impact piston is damaged or worn; maintenance method: replace the O-ring.

4. Overheating of the impact drill gearbox

①Reason: Lack of grease in the gearbox or dirty grease; Repair method: Add or replace grease.

②Reason: The transmission part does not match well or debris falls into the interior; Repair method: Check the transmission part or remove impurities.

5. Excessive heating of the impact drill housing surface

①Reason: The impact drill is overloaded or the drill bit is dull; Repair method: Reduce the impact drill load and sharpen the drill bit.

②Reason: The winding is damp; Repair method: Dry the impact drill winding.

③Reason: Improper assembly makes the armature inflexible; Repair method: Check whether the impact drill armature is stuck or rubbed against the core.

④Reason: The power supply voltage drops; Repair method: Adjust the power supply voltage.

6. Ring fire or large sparks on the commutator

①Reason: The impact drill armature is short-circuited or open-circuited; Repair method: Repair the impact drill armature.

②Reason: The impact drill brush and the commutator are not in good contact; Repair method: Make them in good contact.

③Reason: The surface of the impact drill commutator is not smooth; Repair method: Remove debris and make the commutator surface smooth.

Electric drill maintenance and care:

①Since the impact drill uses double insulation and has no grounding (zero connection) protection, special attention should be paid to protecting the rubber-sheathed cable.

②When carrying and moving the electric drill, you must hold the handle of the electric drill and do not drag the rubber-sheathed cable when moving.

③The rubber-sheathed cable cannot be rolled over by wheels or stepped on; prevent rats from biting.

④A professional electrician should regularly replace the carbon brushes of the impact drill and check the spring pressure.

⑤Ensure that the overall body of the impact drill is intact and clean and that dirt is removed to ensure smooth movement of the impact drill.

⑥Professionals should regularly check whether the various parts of the hand drill are damaged, and those that are severely damaged and cannot be used should be replaced in time.

⑦Timely replenish the body screw fasteners that were lost on the body during operation.

⑧Regularly check whether the bearings, gears and cooling fan blades of the transmission part are flexible and intact, and add lubricating oil to the rotating parts in time to extend the service life of the hand drill.

⑨After use, the hand drill should be returned to the tool library in time for proper storage; do not store it in a personal tool cabinet overnight.

Warm tips: Impact drills should not be used like standard electric drills. First, they can be difficult to control, leading to misalignment and larger holes. Second, their drill bits are often less sharp, resulting in rough openings with burrs or cracks. Third, even if a conversion switch is available, it's best to avoid drilling unless using specialized wood drill bits. The high speed can cause overheating, leading to burnt openings and reduced bit lifespan.