The LiftMaster 878MAXMC is a wireless keyless entry keypad for compatible garage door opener systems. It gives users PIN-code access without carrying a remote control.
This model is commonly associated with replacement keypad applications where a broader compatibility range is needed, including many older Chamberlain/LiftMaster security generations.
Compatibility and Application Notes
The 878MAXMC is commonly used with compatible LiftMaster, Chamberlain, and Sears Craftsman garage door openers that use green, red/orange, purple, or yellow-circle learn-button technology.
It may be used as a replacement direction for select older keypads, including 377LM-type applications, but the opener learn button and programming chart should still be verified.
Commonly Associated With
- Billion Code 390 MHz green learn button applications
- Security+ 390 MHz red/orange learn button applications
- Security+ 315 MHz purple learn button applications
- Security+ 2.0 yellow-circle learn button applications
- Select post-1993 LiftMaster, Chamberlain, and Sears Craftsman garage door openers
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Wireless keyless entry keypad |
| Part Number | 878MAXMC |
| Application | Exterior PIN-code garage door access |
| Security Technology | Billion Code 390 MHz, Security+ 390 MHz, Security+ 315 MHz, Security+ 2.0 |
| Learn Button Color | Green, red/orange, purple, yellow circle |
| Compatible Operator Type | Select compatible residential garage door openers |
| Notes | Often used where a universal MAX keypad is needed |
Also Known As / Related Part Numbers
- 878MAX
- 877MAX
- 377LM
- 377LMC
- 977LM
- 976LM
- G940EV-P2
Technician Note
If the old keypad is 377LM, confirm whether the opener is a purple learn-button Security+ 315 MHz unit or if the site has already had an operator replacement. The keypad and opener generation must match.
Before Ordering
- Read the opener model number and learn button color.
- Confirm whether the old keypad part number is 377LM, 877LM, 877MAX, or another model.
- Check that the opener was manufactured after 1993 and has photoelectric safety sensors.
- Install a fresh battery before troubleshooting keypad range or programming.
- Use the correct programming sequence for the identified learn button color.
Professional Advisory
Keypad replacement should never be used as a workaround for safety sensor faults, damaged doors, or opener travel problems. Have the door system inspected if operation is unreliable.
Product Questions & Answers
It is used to add or replace wireless keypad access on compatible LiftMaster, Chamberlain, and Sears Craftsman garage door openers.
Does the 878MAXMC replace the 377LM?
It may be used as a replacement direction for many 377LM-style applications, but the opener learn button and security technology should be verified first.
Which learn button colors are commonly associated with this keypad?
The 878MAXMC is commonly associated with green, red/orange, purple, and yellow-circle learn button systems when the opener is otherwise compatible.
Can one keypad control more than one door?
Programming capability depends on the keypad instructions and opener setup. Confirm the intended number of openers before promising multi-door control.
What should be checked if the keypad only works close to the opener?
Start with a fresh battery, keypad location, antenna position, and possible interference before replacing the receiver or opener electronics.
