Liftmaster K29-10338 Motor Capacitor, 70MFD, 50/60Hz, 230V
The LiftMaster K29-10338 is a 70MFD, 230VAC motor capacitor used in select LiftMaster light-duty and medium-duty commercial door operator applications. In compatible single-phase AC motor systems, the capacitor helps the motor develop the torque needed to start or run correctly.
A failing capacitor is often suspected when the motor hums, struggles to start, starts inconsistently, runs weak, or trips overload protection. However, similar symptoms can also come from a bad motor, binding door, incorrect voltage, damaged wiring, or a failed control component. The capacitor should be tested and matched to the original rating before replacement.
This part is commonly cross-referenced as 29-10338, 30B432, 29-3530, and G293530. Some references associate it with MT, BMT, MJ, MH, HMJ, and MHS commercial operator families, but the final fitment check should be the operator parts diagram and original capacitor label.
Compatible With
Common Compatible Models and Applications
- Select LiftMaster light-duty commercial door operators using a 70MFD 230VAC capacitor
- Select LiftMaster medium-duty commercial door operators using K29-10338
- MT, BMT, MJ, MH, HMJ, and MHS commercial operator references when confirmed by parts diagram
- Single-phase AC motor applications that specify 29-10338, 30B432, 29-3530, or G293530
Additional Model Families to Verify
- Other LiftMaster commercial door operator motor circuits when the original capacitor label matches 70MFD and 230VAC
- Compatible applications must match MFD rating, voltage rating, terminal style, and mounting space
Important Compatibility Notes
- Match the MFD rating to the original capacitor.
- Voltage rating must be equal to or higher than the specified requirement.
- Capacitors can hold a charge after power is disconnected.
Features and Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Motor capacitor |
| Part Number | K29-10338 |
| Capacitance | 70MFD |
| Voltage Rating | 230VAC |
| Frequency | 50/60Hz |
| Application | Select commercial door operator motor circuits |
| Compatible Operator Type | Light-duty and medium-duty LiftMaster commercial door operators |
| Related Numbers | 29-10338, 30B432, 29-3530, G293530 |
Also Known As / Related Part Numbers
- K29-10338
- 29-10338
- 30B432
- 29-3530
- G293530
- LM-K29-10338
- 70MFD 230V capacitor
Technician Note
A capacitor should be tested with the proper meter and compared to its rated value. If a new capacitor fails quickly, check motor amperage, door balance, supply voltage, overload condition, and wiring before replacing another capacitor.
Before Ordering
- Confirm the original capacitor is 70MFD.
- Confirm the voltage rating is 230VAC or an approved equivalent rating.
- Match terminal style and physical size.
- Verify the operator parts diagram or original capacitor label.
- Discharge and handle the capacitor safely.
Professional Advisory
Capacitors store electrical energy and are installed in motor circuits. Service should be performed by a qualified commercial door technician with power disconnected and proper safety procedures followed.
Important Ordering Warnings
- Do not replace a capacitor with a different MFD rating to force a weak motor to run.
- A humming motor may also indicate a stuck door, failed motor, bad relay, or incorrect voltage.
Product Questions and Answers
What is the rating of K29-10338?
K29-10338 is rated 70MFD, 230VAC, 50/60Hz.
What symptoms can a bad capacitor cause?
A weak capacitor can cause humming, failure to start, slow starting, intermittent motor operation, or overload trips on compatible operators.
What related part numbers are used for this capacitor?
Common related numbers include 29-10338, 30B432, 29-3530, and G293530.
Can I use a different MFD capacitor?
No. The MFD rating should match the original capacitor and operator specification.
Is this capacitor for every LiftMaster operator?
No. It is for select light-duty and medium-duty commercial door operators that specify this capacitor rating and part number.
