How to judge and replace a faulty motor or reducer in Twin Tub Washing Machines?

Judgment and Replacement of Motor Faults in Twin Tub Washing Machines

1. Visual Inspection
Observe whether there are cracks, deformations, or obvious damages on the motor housing; check if the wiring terminals are loose or worn.
Pay attention to whether there is abnormal high temperature, a burning smell, or oil stains on the motor surface, which are often signs of overheating in the internal windings or bearings.

2. Operating Status Detection
After starting the motor, listen for any abnormal noises (such as metal friction sounds or buzzing sounds), which may be caused by worn bearings or poor gear meshing.
Observe whether the motor rotates smoothly. If there is jitter or unstable speed, further check the rotor balance and the condition of the bearings.

3. Electrical Testing
After powering off, use a multimeter to measure the resistance of the windings. If there is a short circuit or open circuit, the windings or the entire motor must be replaced.
Check whether the electrical components such as the power cord, fuse, and contactor are in good condition. Replace the faulty components in time if found.

4. Replacement Steps
Confirm the need for replacement: When there is visible damage, abnormal noise, the winding test fails, and the repair cost is higher than the replacement cost, decide to replace the motor.
Prepare tools and a new motor: Get wrenches, screwdrivers, and protective gloves ready, and select a motor with the same specifications as the original one.
Remove the old motor: First, cut off the power supply, remove the fixing bolts, unplug the electrical connection wires, and take out the old motor.
Install the new motor: Align the new motor with the mounting holes, fix the bolts, and reconnect the electrical wires, ensuring that the wiring is secure.
Debug and verify: After powering on, check the operating noise, speed, and temperature. Only put the motor into use after confirming that there are no abnormalities.

Judgment and Replacement of Reducer Faults

1. Visual and Structural Inspection
Check whether there are wear, scratches, or spalling on the gear surface; replace the bearing housing or bearing cap if there are cracks or detachments.
Observe whether there are cracks, deformations, or oil leakage on the housing, which will affect the sealing performance and service life of the reducer.

2. Diagnosis of Operating Abnormalities
Judge by noise, vibration, and oil temperature: Abnormal noise or strong vibration often indicates poor gear meshing or damaged bearings; an abnormal increase in oil temperature suggests insufficient lubrication or increased internal friction.
Check for oil leakage, an increase in oil stains, or a darkening of the oil color. These are signs of lubricant aging or the mixing of metal debris, which may require oil replacement or even the replacement of the entire reducer.

3. Detection of Internal Components
After disassembly, use a feeler gauge to measure the gear meshing clearance. If it exceeds the maximum value specified by the manufacturer, replace the gears.
Check the wear degree of the bearings and the quality of the lubricating oil. Replace the bearings and refill with lubricating oil that meets the specifications if necessary.

4. Replacement and Re assembly
Confirm the replacement time: When the gears are worn, the bearings are damaged, or the housing has cracks that cannot be repaired, decide to replace the reducer or key components.
Disassembly steps: First, cut off the power supply and take protective measures. Remove the fixing bolts, seals, and connecting shafts, and record the position of each component for reassembly.
Replace components: Replace the worn gears, bearings, seals, or the entire reducer; at the same time, check the coaxiality to ensure the assembly accuracy.
Assembly and debugging: Re install all the components in reverse order, fill with lubricating oil and expel the air. After tightening the bolts, conduct an idling test. Only put the reducer into formal use after confirming that there are no abnormal noises, vibrations, or oil leakage.