Description
Screw Conveyor Gear Reducer – M41, M43, M45, M47 and M49
Screw Conveyor Gear Reducer models M41, M43, M45, M47 and M49 are supplied for the drive ends of cement screw conveyors and tubular screw conveyor systems.
The complete reducer model is determined by five connected details:
- Reducer series
- Reduction ratio
- Motor frame
- Conveyor connection type
- Screw conveyor diameter
This means that a housing marked only “M47” or “M49” is not enough to identify a replacement. The ratio, motor interface, mounting dimensions and output spline must also correspond with the conveyor already in use.
Available reduction ratios include 1:5, 1:7 and 1:10, with configurations covering screw conveyor diameters from 114 mm to 323 mm.
Reducers can be supplied separately, assembled with an electric motor or prepared as a complete screw conveyor drive-end assembly.
M Series Gear Reducer Selection
| Reducer Series | Screw Conveyor Diameter | Reduction Ratios | Motor Range | Output Connection | Approx. Weight |
|---|---|---|---|---|---|
| M41 | 114-139 mm | 1:5, 1:7, 1:10 | Frame 90 / 1.1-1.5 kW | 28 × 25 | 20 kg |
| M43 | 114-139, 168, 193, 219 mm | 1:5, 1:7, 1:10 | Frame 90-132 / 1.1-7.5 kW | 28 × 25 or 40 × 36 | 20-32 kg |
| M45 | 168, 193, 219, 273 mm | 1:5, 1:7, 1:10 | Frame 100-160 / 2.2-15 kW | 40 × 36 | 46-52 kg |
| M47 | 193, 219, 273, 323 mm | 1:5, 1:7, 1:10 | Frame 132-160 / 5.5-15 kW | 40 × 36 | 66-80 kg |
| M49 | 219, 273, 323 mm | 1:5, 1:7, 1:10 | Selected frame and power combinations | 60 × 55 | 12 |
The table is a quick model reference rather than a rule that allows any listed motor, ratio and conveyor diameter to be combined freely.
Final selection must consider:
- Conveyor diameter
- Overall conveyor length
- Horizontal or inclined installation
- Conveyed material
- Required screw speed
- Empty or loaded starting
- Motor frame and power
- Existing mounting flange
- Output spline dimensions
- Available installation clearance
Several reducer series can be used with the same nominal screw conveyor diameter. For example, a 219 mm conveyor may use an M43, M45, M47 or M49 configuration depending on its drive requirement and mechanical interface.
Detailed Reducer and Conveyor Connections
| Reducer Model | Screw Conveyor Diameter | Output Connection | Approx. Weight |
|---|---|---|---|
| M41.ES0 | 114-139 mm | 28 × 25 | 20 kg |
| M43.ES0 | 114-139 mm | 28 × 25 | 20 kg |
| M43.ES1 | 168 mm | 40 × 36 | 26 kg |
| M43.ES2 | 193 mm | 40 × 36 | 26 kg |
| M43.ES3 | 219 mm | 40 × 36 | 32 kg |
| M45.ES1 | 168 mm | 40 × 36 | 46 kg |
| M45.ES2 | 193 mm | 40 × 36 | 48 kg |
| M45.ES3 | 219 mm | 40 × 36 | 50 kg |
| M45.ES4 | 273 mm | 40 × 36 | 52 kg |
| M47.ES2 | 193 mm | 40 × 36 | 66 kg |
| M47.ES3 | 219 mm | 40 × 36 | 68 kg |
| M47.ES4 | 273 mm | 40 × 36 | 70 kg |
| M47.ES5 | 323 mm | 40 × 36 | 80 kg |
| M49.ES3 | 219 mm | 60 × 55 | 120 kg |
| M49.ES4 | 273 mm | 60 × 55 | 120 kg |
| M49.ES5 | 323 mm | 60 × 55 | 120 kg |
Models using the same nominal output connection are not automatically interchangeable.
M43, M45 and M47 configurations may all use a 40 × 36 output connection, but their housing dimensions, conveyor flanges, installation lengths, motor frames and load capacities are different.
The complete reducer drawing should therefore be checked before replacing one series with another.
How to Read the Reducer Model
A complete M Series model code contains the information needed to identify the drive configuration.
Example:
M47 07 132 ES 3
| Code | Meaning |
|---|---|
| M47 | Reducer series |
| 07 | Reduction ratio code |
| 132 | Motor frame |
| ES | Screw conveyor connection type |
| 3 | Conveyor diameter code |
Reduction Ratio Codes
| Code | Reduction Ratio |
|---|---|
| 05 | 1:5 |
| 07 | 1:7 |
| 10 | 1:10 |
Screw Conveyor Diameter Codes
| Code | Screw Conveyor Diameter |
|---|---|
| 0 | 114-139 mm |
| 1 | 168 mm |
| 2 | 193 mm |
| 3 | 219 mm |
| 4 | 273 mm |
| 5 | 323 mm |
The available diameter suffix depends on the reducer series. Not every reducer can be ordered with every diameter code.
For example:
- M41 is supplied for code 0.
- M43 covers codes 0 to 3.
- M45 dimensioned models cover codes 1 to 4.
- M47 covers codes 2 to 5.
- M49 covers codes 3 to 5.
The full code should be provided whenever it remains visible on the existing reducer nameplate.
Motor Frame and Ratio Must Be Confirmed Together
The motor frame code identifies more than motor power. It also affects the mounting flange, shaft diameter, shaft extension and installation dimensions.
Common motor-frame references include:
| Motor Frame | Typical Motor Power |
|---|---|
| 90 | 1.1-1.5 kW |
| 100 | 2.2-3 kW |
| 112 | 4 kW |
| 132 | 5.5, 7.5 or 9.2 kW |
| 160 | 11 or 15 kW |
| 180 | 18.5 or 22 kW for selected configurations |
| 200 | 30 kW for selected configurations |
Not every motor frame is available with every reducer series, ratio or conveyor diameter.
An existing motor can be reused only after confirming:
- Motor frame
- Rated power
- Motor speed
- Mounting flange diameter
- Bolt-hole pattern
- Motor shaft diameter
- Shaft extension
- Keyway dimensions
- Voltage and frequency
Two motors with the same rated power may use different frames and mounting dimensions.
The reduction ratio must also be retained or deliberately recalculated. Replacing a 1:7 reducer with a 1:10 reducer changes the screw shaft speed and available output torque even when the housing and flange appear similar.
Four Points That Decide Whether a Replacement Will Fit
1. Conveyor Mounting Flange
The reducer must align with the drive-end flange of the screw conveyor.
Confirm:
- Flange outside diameter
- Center opening
- Bolt-hole quantity
- Bolt-hole diameter
- Bolt-circle diameter
- Flange thickness
2. Output Spline
The output connection transfers torque from the reducer into the screw conveyor drive shaft.
Confirm:
- Major and minor spline dimensions
- Number of teeth
- Effective spline length
- Shaft engagement depth
- Connection direction
A reducer may bolt onto the conveyor while still having an incompatible output spline.
3. Motor Interface
The reducer input side must match the motor frame, flange and shaft.
Motor power alone cannot confirm compatibility.
4. Installation Length and Orientation
The complete assembly must fit within the available space around the conveyor.
Check:
- Distance from the conveyor flange to the motor end
- Motor orientation
- Oil filling and drain access
- Breather position
- Nearby supports, platforms and guards
- Space required for maintenance
These measurements are especially important when the original reducer is no longer available in exactly the same configuration.
Reducer Supply Options
The screw conveyor gearbox can be supplied as:
- Gear reducer only
- Gear reducer with electric motor
- Gear reducer with reducer seal
- Gear reducer with motor and seal
- Complete screw conveyor drive-end assembly
- Replacement reducer matched to existing dimensions
Related components can include:
- Electric motor
- Reducer seal
- Drive shaft
- Shaft coupling
- Mounting flange
- Fasteners and connection parts
The reducer seal should be confirmed from the shaft diameter and seal housing rather than selected from the reducer series name alone.
When replacing a reducer after repeated powder leakage, also inspect the drive-shaft surface, bearing condition and shaft alignment. A new seal will not permanently correct leakage caused by excessive shaft movement.
Information Required for Selection or Replacement
For a new screw conveyor gear reducer, provide:
- Screw conveyor diameter
- Conveyor length
- Horizontal or inclined installation
- Installation angle
- Conveyed material
- Motor power
- Motor frame
- Required reduction ratio
- Empty or loaded starting condition
- Reducer only or complete motor assembly
For a replacement reducer, also provide:
- Complete model code
- Reducer nameplate photo
- Motor nameplate photo
- Conveyor-side flange dimensions
- Motor-side flange dimensions
- Output spline dimensions
- Installation length
- Photos of the front, rear and both sides
- Existing reducer seal dimensions
- Available installation clearance
When the model plate is missing, dimensions are more reliable than selecting a reducer from housing appearance alone.
Frequently Asked Questions
Our screw conveyor is 219 mm. Should we use an M43, M45, M47 or M49 reducer?
The conveyor diameter alone cannot determine the reducer series because several models are available for 219 mm systems.
Selection depends on the required motor power, reduction ratio, conveyor length, installation angle, starting load, output connection and existing mounting dimensions. For a replacement, the original flange and spline normally narrow the choice more reliably than the conveyor diameter.
The old reducer is marked M47. Is that enough to order a replacement?
No. M47 identifies only the reducer series.
The complete order normally also requires the ratio code, motor frame and screw conveyor diameter suffix, such as M47 07 132 ES 3. The output spline and mounting dimensions should still be checked before production.
Can a 1:7 reducer be replaced by a 1:10 reducer when both fit the same flange?
Not as a direct equivalent.
Changing the ratio changes the screw shaft speed and output torque. This can affect conveying capacity, motor load, material filling and starting performance. The ratio should only be changed after reviewing the complete conveyor operating condition.
Can an M45 replace an M47 because both use a 40 × 36 output connection?
Not automatically.
The output connection is only one matching point. M45 and M47 reducers have different housing sizes, weights, motor ranges, conveyor flanges and installation dimensions. A complete dimensional and load comparison is required before changing the reducer series.
Can we reuse the existing motor with a new reducer?
Yes, when the motor frame, mounting flange, shaft, keyway, speed, voltage and frequency are compatible.
Matching motor power alone is not sufficient. Please provide the motor nameplate and motor-side connection dimensions when ordering the reducer without a new motor.
The reducer nameplate is missing. What measurements are needed to identify the correct model?
Provide the screw conveyor diameter, mounting-flange dimensions, bolt-hole pattern, output spline, installation length, motor frame and motor power.
Photos should show the complete housing, conveyor connection, motor connection and output shaft area. When the original model cannot be confirmed, dimensional matching is more dependable than choosing from the external shape.
