LiftMaster K75-12830 Gear Reducer Kit, 230/460V, 1HP
The LiftMaster K75-12830 is a 230/460V, 1 HP replacement gear reducer kit for select commercial GH gearhead door operators. The reducer is the gearbox that changes motor speed into usable output torque for the drive chain, sprocket, and door shaft. In a commercial environment, that reducer carries a large part of the mechanical load every time the operator starts, stops, and reverses.
This item is voltage-specific. It may look similar to other LiftMaster gear reducer kits, but K75-12830 is the 1 HP, 230/460V version. If the operator is 115V, the usual related path is K75-12829. If the operator is a higher-horsepower 230/460V unit, K75-12832 or another reducer kit may be required instead.
Compatible With / Common Applications
Known compatibility and common applications include select 1 HP, 230/460V LiftMaster commercial operator diagrams that call for K75-12830:
- LiftMaster GH commercial door operators with 1 HP 230/460V configuration
- Select LiftMaster industrial-duty gearhead / gear-reduced commercial door operators using K75-12830
- Logic 5.0 GH 1 HP references where the parts diagram specifies this reducer
- Logic 4.0 GH 1 HP references where the parts diagram specifies this reducer
- Commercial rolling steel and sectional door applications using compatible 230/460V 1 HP GH operators
- Not for 115V 1 HP applications that call for K75-12829
- Not for 1.5 HP, 2 HP, 575V, or 5 HP gear reducer applications
Features and Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Gear reducer / gear housing kit |
| Part Number | K75-12830 |
| Voltage | 230/460V |
| Horsepower | 1 HP |
| Application | Commercial gearhead operator speed reduction and torque transfer |
| Compatible Operator Type | Select GH industrial-duty commercial door operators |
| Related Kit Design | Gear housing/reducer assembly for 230/460V 1 HP configurations |
| Notes | Do not substitute by appearance; match voltage and horsepower |
Also Known As / Related Part Numbers
- K75-12830
- 75-12830
- K7512830
- K5 K75-12830
- Gear Housing Kit 1HP 230/460V
- Gear Reducer Kit 230/460V 1HP
- LIF-K75-12830
- Related 115V 1 HP version: K75-12829
- Related 230/460V 1.5-2 HP version: K75-12832
Technician Note
Reducer replacement is a good time to check the drive chain, output sprocket, motor coupling, brake, and door shaft alignment. A reducer that failed because of door drag or misalignment can be damaged again quickly.
Before Ordering
- Confirm the operator voltage is 230/460V.
- Confirm the operator horsepower is 1 HP.
- Check the parts diagram for K75-12830 or an approved cross-reference.
- Confirm the existing reducer mounting and shaft arrangement.
- Inspect the full drivetrain for binding before installation.
Professional Advisory
Commercial reducer replacement involves heavy moving doors and electrical equipment. Use a qualified technician and follow lockout procedures before servicing the operator.
Product Questions and Answers
What is the voltage for K75-12830?
K75-12830 is the 230/460V 1 HP gear reducer kit path.
Is K75-12830 used on GH operators?
Yes, it is commonly listed for select LiftMaster GH commercial door operators with matching 1 HP 230/460V configuration.
No. K75-12829 is for 115V 1 HP applications. K75-12830 is for 230/460V 1 HP applications.
What does the gear reducer do?
It reduces motor speed and increases torque so the operator can move a heavy commercial door through the drive chain and sprockets.
Why should I check the door before replacing the reducer?
A stuck, unbalanced, or dragging door can overload the reducer and cause repeat failure even after the new part is installed.
