A Gear Motor is a homogeneous compact device consisting of a gear unit and a motor. Today's gearboxes are usually used in conjunction with AC motors or servo motors. In most cases, the purpose of adding a gearbox is to limit the speed of the motor shaft and increase the output torque of the motor.

When replacing an obsolete geared motor system, relying only on conventional models often results in a mismatch. Follow this guide to ensure accurate replacement of gear motors from brands such as GONGJI, SIMEX and SOHIX.

Step 1: Provide complete and clear pictures of the motor (e.g. attached)

First we need to know clearly the overall construction of the motor and whether it contains a gearbox. Is it an external reduction or a built-in reduction device. These we can judge by the complete picture of the motor.

Step 2: Capture Motor Nameplate Data

A clear nameplate photo is critical for matching gearmotor specs:

Model number: it will show on this nameplate

Voltage: AC/DC type (e.g., 24VDC or 220VAC)

Power: Rated wattage (W/KW) and RPM

Speed reducer ratio: 1/20. 1/9 etc.

Brand Codes: GONGJI/SIMEX/SOHIX often embed technical details in serial numbers.

Step 3: Verify Speed Reducer Specs

For integrated speed reducers:

Gear Ratio (e.g., 15:1)

Output Torque (Nm)

Material: Aluminum (SIMEX) or cast iron (GOHGJI)

Lubrication: Grease or oil bath

Step 4: Analyze output shaft details

Critical to the mechanical connection:

Shaft diameter: Measured with calipers (tolerance ±0.02 mm)

Keyway type: Parallel or helical (common in SOHIX models)

Eccentricity: Verify whether the shaft is centered or eccentric

By standardizing these 4 steps, engineers achieve 98%+ success rates in replacing legacy gearmotors, including servo motor-driven systems. Brands like GONGJI, SIMEX, and SOHIX frequently update models, and these brands are made in same factory, so they can be replaced each other. Making visual and parametric verification essential, then Rico can give the best way to support you.

【 Go Back 】 | 【 Print 】