Liftmaster K32-11009 Gear Reducer, 45:1, 1/3-1HP
The LiftMaster K32-11009 gear reducer is a 45:1 reduction gearbox for select GH commercial gearhead door operators. The reducer lowers motor speed and increases torque through the operator drive train, allowing the GH operator to move heavy commercial overhead doors in a controlled manner.
This part should be selected by gear ratio, horsepower range, operator family, and parts diagram. Several LiftMaster gear reducers have similar names but different ratios, horsepower ranges, shafts, and mounting patterns. K32-11009 is generally associated with GH gearhead commercial door operator applications in the 1/3 HP to 1 HP range where the diagram calls for the 45:1 reducer.
What This Part Does
- Provides 45:1 speed reduction for compatible GH commercial gearhead operators.
- Transfers motor output through the operator drive system at the correct torque and speed.
- Replaces a worn, leaking, noisy, or damaged reducer when the part number and operator model match.
Compatible With
Known compatibility and application references found during this review include:
- LiftMaster GH commercial gearhead door operators where the parts diagram calls for K32-11009.
- Select 1/3 HP, 1/2 HP, 3/4 HP, and 1 HP GH applications where the 45:1 reducer is specified.
- Commercial gearhead door operator applications using related references 32-11009, 3211009, or 3290011.
- Not a direct replacement for K32-11010 44:1, K32-11414, K32-10540 20:1, K32-8002, GT/GSD/SL595 reducers, or non-GH gearboxes unless the diagram confirms it.
Also Known As / Related Part Numbers
Use these references to compare old labels and supplier catalogs:
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Gear reducer / gearbox |
| Part Number | K32-11009 |
| Reduction Ratio | 45:1 |
| Application | GH commercial gearhead operator drive system |
| Compatible Operator Type | Commercial gearhead door operator |
| Horsepower Range | Select 1/3 HP to 1 HP GH applications where specified |
| Related Numbers | 32-11009, 3211009, 3290011 |
| Notes | Match ratio, horsepower, shaft arrangement, and operator diagram before ordering. |
Technician Note
A failed gear reducer is often a symptom of a heavy, binding, or poorly balanced commercial door. Before replacing the reducer, inspect the door, chain, sprockets, bearings, brake, clutch, and mounting alignment.
Before Ordering
- Confirm the operator is a LiftMaster GH gearhead commercial door operator.
- Confirm the reducer ratio is 45:1.
- Confirm the horsepower range and parts diagram call out K32-11009 or a listed related number.
- Compare shaft arrangement and mounting points before installation.
- Inspect the door and drive train so the new reducer is not overloaded.
Professional Advisory
Gear reducer replacement is a heavy mechanical repair on a commercial door operator. The door must be secured, power disconnected, and the drive train tested by a qualified technician before the operator is returned to service.
Product Questions
What operator family uses K32-11009?
K32-11009 is associated with LiftMaster GH commercial gearhead door operators where the 45:1 reducer is specified.
What are the related part numbers?
Related references include 32-11009, 3211009, and 3290011.
Is this the same as K32-11010?
No. K32-11010 is a different reducer reference and should not be substituted without matching the exact parts diagram.
Can this fit GT, GSD, or SL operators?
Do not assume that. Those operator families can use different reducer assemblies and ratios.
What should be checked before replacing a gear reducer?
Check door balance, chain and sprocket alignment, bearings, brake, clutch, and mounting. A bad reducer may be caused by overload or misalignment.
