LiftMaster 41D794 Motor with Positioning Sensor
Product Summary
The LiftMaster 41D794 (also recognized by the alternate part number 041D0794) is an essential OEM replacement component designed to restore peak performance to your automated garage system. Engineered specifically as a DC Motor with an integrated Positioning Sensor, this high-authority replacement part is the definitive solution for failing motors on select residential belt drive operators. By directly swapping out a compromised drive system with the LiftMaster 41D794, property owners and B2B installers can avoid the heavy cost of a full system replacement, bringing quiet, reliable, and secure operation back to the garage door environment.
This robust 3/4 horsepower DC motor is recognized across the industry as a top-tier piece of access control hardware. Its built-in positioning sensor provides real-time feedback to the operator's logic board, ensuring exact travel limits, smooth deceleration, and immediate safety reversals. As a premier solution among OEM gate parts, the 41D794 guarantees that your garage door opener maintains the rigorous safety and durability standards expected from modern access control systems.
Key Features & Benefits
• Integrated Positioning Sensor: Provides accurate travel feedback to the operator’s logic board, allowing for precise open and close limits and preventing inconsistent door travel.
• High-Torque 3/4 HP DC Motor: Delivers superior lifting power combined with ultra-quiet operation, making it ideal for homes with living spaces directly above or adjacent to the garage.
• Enclosed Gear Case: Features a continuously lubricated, sealed gear assembly that reduces internal friction, ensuring a significantly longer operational lifespan and reliable daily cycling.
• Battery Backup Compatibility: Fully supports integrated Chamberlain Group backup battery systems, maintaining secure access and powering the door for up to 40 cycles within a 24-hour period during a local power outage.
• Advanced Safety Reversal: Works in tandem with the positioning sensor to automatically stop and reverse the door if an obstruction is detected mid-cycle, ensuring maximum protection for vehicles and personnel.
Compatibility Guide
In strict accordance with manufacturer specifications, the LiftMaster 41D794 is a brand-specific replacement component. It is exclusively engineered for use with compatible LiftMaster and Chamberlain residential DC belt drive ceiling-mount operators.
Compatible Models Include:
• LiftMaster: 3850
• Chamberlain: HD900D, WD962KD, and 248754
(Note: Always verify compatibility by matching the part number 41D794 on your original motor label or within your specific operator's manual. This motor is not a universal substitute and will not fit AC operators or wall-mount/jackshaft models.)
Professional Specifications
For installers and technical personnel verifying mechanical and electrical parameters prior to replacement, please refer to the data below:
| Specification | Detail |
| Primary Part Number | 41D794 |
| Interchangeable Part #s | 041D0794, 05-41D794 |
| Drive Compatibility | DC Belt Drive (Ceiling Mount) |
| Motor Rating | 3/4 Horsepower (HP) |
| Operating Voltage | Powered by Operator (Typical 120V, 60 Hz System) |
| Included Components | DC Motor, Integrated Positioning Sensor, Plug-in Harness |
| Safety Features | Position tracking, thermal protection, automatic reversal |
| Battery Backup Capable | Yes (With compatible systems) |
Frequently Asked Questions (FAQ)
1. What are the common signs that my original 41D794 motor has failed?
Symptoms of a failing motor or positioning sensor include a humming noise with no door movement, the operator stopping arbitrarily mid-cycle, erratic travel distances, or the logic board frequently losing its programmed open and close limits.
2. Does this replacement kit include a new sprocket and mounting hardware?
No. The LiftMaster 41D794 includes the DC motor and the attached positioning sensor with its wiring harness. Professional installers must reuse the operator's existing drive sprocket, mounting bracket, and retaining hardware during the swap.
3. Do I need to reset my door's travel limits after installing the new motor?
Yes. Because the positioning sensor establishes the physical boundaries of the door's travel, replacing this assembly disrupts the logic board's memory. You must perform a complete reprogramming of the UP and DOWN travel limits, as well as the force settings, following the manufacturer's instructions.
4. Can I install this motor into a chain drive operator?
While some DC motors share similar architecture, the 41D794 is heavily utilized and specified for Chamberlain and LiftMaster belt drive systems. You must verify that your specific model number explicitly calls for the 41D794 to ensure proper gear ratio and fitment.
5. What are the safety procedures for replacing this internal motor assembly?
Before removing the operator cover or disconnecting the internal wire harness, you must completely disconnect the primary 120V AC power by unplugging the unit. Furthermore, if your system utilizes a backup battery, it must be disconnected to prevent any accidental motor activation during the installation process.
[ITEMPRICE]