LiftMaster 32-17914 Gear Reducer, 45:1, 5HP
The LiftMaster 32-17914 is a heavy 45:1 gear reducer for select 5 HP commercial and industrial operators. The reducer is the main mechanical gearbox that turns the high-speed motor output into a slow, high-torque drive output. On 5 HP operators, this part must handle significantly more load than smaller 1 HP or 2 HP reducer kits.
This reducer is commonly associated with large GH and GT gearhead operator applications where the service diagram calls for 32-17914 or K32-17914. Because it is tied to 5 HP industrial systems, it should be verified by the operator model, horsepower, ratio, mounting style, and shaft details before ordering.
Compatible With / Common Applications
Known compatibility and common applications include select 5 HP LiftMaster commercial operator diagrams that call for 32-17914 or K32-17914:
- LiftMaster GH Series 5 HP industrial-duty gearhead operator references
- LiftMaster GT Series 5 HP industrial-duty gearhead trolley operator references
- Logic 5.0 5 HP industrial door operator service paths where 32-17914 is specified
- Logic 4.0 5 HP industrial door operator service paths where 32-17914 is specified
- Heavy rolling steel, oversized sectional, and industrial door applications using compatible 5 HP gearhead operators
- Commercial operators requiring a 45:1 gear reducer with matching motor mount and shaft configuration
- Not a substitute for K75-12829, K75-12830, or K75-12832 lower-horsepower reducer kits
Features and Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Gear reducer |
| Part Number | 32-17914 |
| Related Service Number | K32-17914 |
| Reduction Ratio | 45:1 |
| Horsepower | 5 HP |
| Application | High-torque speed reduction for compatible industrial gearhead operators |
| Compatible Operator Type | Select GH and GT 5 HP commercial door operators |
| Mounting Notes | Commonly associated with C-face motor mounting; verify original configuration |
| Notes | Match ratio, horsepower, and parts diagram before ordering |
Also Known As / Related Part Numbers
- 32-17914
- K32-17914
- LIF-32-17914
- LM-32-17914
- 45:1 5HP gear reducer
- 5 HP commercial operator gear reducer
- GH 5HP gear reducer
- GT 5HP gear reducer
- Related lower HP reducer families: K75-12829, K75-12830, K75-12832
Technician Note
A 5 HP reducer failure often points to extreme load, poor door balance, worn bearings, or drivetrain misalignment. Do not install the reducer without checking the door, chain path, sprockets, brake, and motor mount.
Before Ordering
- Confirm the operator is a 5 HP commercial/industrial unit.
- Confirm the required gear ratio is 45:1.
- Check for 32-17914 or K32-17914 on the parts diagram.
- Confirm shaft and C-face motor mounting details.
- Inspect related sprockets, chain, bearings, brake, and door balance.
Professional Advisory
This is a heavy industrial drivetrain repair. A qualified commercial door technician should handle removal, alignment, and safety testing with power locked out and the door secured.
Product Questions and Answers
What ratio is the 32-17914 reducer?
It is a 45:1 gear reducer.
What horsepower is it used with?
It is used in select 5 HP commercial and industrial operator applications.
Is K32-17914 the same part family?
Yes. K32-17914 is a common service-kit or related reference for 32-17914.
No. K75-12832 is a lower-horsepower gear reducer kit path. 32-17914 is for select 5 HP 45:1 applications.
What should be inspected with this repair?
Inspect the chain, sprockets, door shaft, bearings, brake assembly, motor mount, and door balance before returning the operator to service.
