LiftMaster 85870

Overview

The LiftMaster 85870 is a heavy-duty chain drive garage door opener powered by a 3/4 HP AC motor. It is built to handle larger, heavier residential doors that would strain a standard 1/2 HP opener over time. The 85870 includes myQ Wi-Fi for smartphone control and Security+ 2.0 rolling-code encryption for access security. Battery backup is not included in this model.

LiftMaster designed the 85870 for homeowners with demanding garage door setups: wide double-car doors, insulated doors with extra weight, carriage-house style doors with added hardware, or any door that cycles frequently throughout the day. The extra motor headroom means the opener is not working at the edge of its capacity on every cycle, which translates to longer motor life and more consistent door speed over years of use.

This model fills the space between standard residential openers and commercial-grade units. It is the right call when a standard opener feels underpowered but a full commercial opener is more than the application needs.

Drive type, motor, and power

The 85870 uses a chain drive system with a hardened steel chain pulling the trolley along the overhead rail. Chain drives are the most durable and widely serviced drive type in the residential market. They handle heavy doors, high cycle counts, and the mechanical stress of daily use without the sensitivity of belt or screw drive systems.

The 3/4 HP AC motor sets the 85870 apart from standard residential openers. Most residential doors in the single-car and standard double-car size range are handled by 1/2 HP openers. When the door is heavier than average, either because it is insulated, clad in steel, or fitted with wood overlays, the motor needs more power to move it at a consistent speed without straining. A 3/4 HP motor provides that extra capacity.

AC motors run directly off household current without a capacitor or battery pack. They are known for consistent performance under sustained load. Unlike DC motors, AC motors do not use soft-start or soft-stop cycles. The door moves at a steady rate from the moment it begins to open or close. This is not a problem for most applications. It does mean the mechanical impact at the beginning and end of each cycle is slightly higher than with DC-powered openers.

No battery backup is included. If the power goes out, the door will not operate automatically. A manual release cord allows the door to be operated by hand during an outage.

Smart features, security, and safety

The 85870 connects to your home Wi-Fi network through the built-in myQ module. The free myQ app for iOS and Android lets you open or close the door remotely, check its status at any time, receive alerts when the door opens or closes, and set automatic closing reminders. myQ also works with Google Assistant and Amazon Alexa for voice control.

Security+ 2.0 is LiftMaster's current rolling-code security standard. The access code changes with every signal sent by a remote or wireless keypad. This makes it very difficult for anyone to copy your remote's code and use it to open the door.

The 85870 meets UL 325 safety requirements for residential garage door operators. It ships with photo-eye sensors that detect obstructions in the door's path and trigger an automatic reversal. The motor also includes a force-sensing reversal that stops and reverses the door if it encounters unexpected resistance during the closing cycle.

A built-in light socket provides garage illumination. The light activates automatically each time the door is operated and turns off after a set interval. HomeLink compatibility allows vehicles with integrated garage control systems to operate the 85870 directly.

Specifications at a glance

Specification	Detail
Drive type	Chain (Heavy Duty)
Motor type	AC
Horsepower	3/4 HP
Battery backup	No
myQ / Wi-Fi	Yes (built-in)
Security+ 2.0	Yes
UL 325 photo-eye sensors	Yes
Soft start / soft stop	No (AC motor)
Motor warranty	Lifetime
Parts warranty	5 years
Accessories warranty	1 year

Is this the right opener for you, and how G Brothers helps

The LiftMaster 85870 is built for homeowners who need more motor power than a standard residential opener provides. If your garage door is heavy, oversized, or cycles many times per day, the 85870 handles the load without working at its limit. That keeps motor temperature down and extends the opener's service life.

This opener is a strong match in these cases:

Large double-car or triple-car garages. Wide doors are heavier and place more strain on the motor at each cycle. The 85870's 3/4 HP rating gives it the headroom to handle these doors reliably.

Insulated or wood-overlay doors. Insulated steel doors and doors with decorative wood cladding can weigh considerably more than a basic non-insulated door. A heavier door needs more motor capacity to cycle at a consistent speed.

High-traffic garages. Homes where the garage is used as the main entry point throughout the day put more cycles on the opener. A higher-capacity motor handles this demand better over time.

Contractors and new construction. The 85870's lifetime motor warranty and 5-year parts warranty make it a solid spec choice for new construction where the builder wants a long-lasting product.

The 85870 is not the best fit for homeowners who need battery backup. It also runs louder than a DC belt drive opener, so if quiet operation is a priority, comparing it to a belt drive model is worthwhile.

G Brothers Garage Doors installs and services the LiftMaster 85870 across the Denver metro, including Castle Rock, Brighton, Commerce City, Northglenn, and the surrounding Front Range communities. Our technicians are experienced with heavy-duty residential openers and handle the full installation: mounting, travel limit programming, photo-eye alignment, remote pairing, and myQ network setup.

Contact G Brothers for a free estimate. We can confirm whether the 85870's power rating is right for your door's weight and cycle demands, or recommend an alternative if another model is a better fit.

The LiftMaster 85870 carries a lifetime motor warranty and a 5-year parts warranty. This is one of the stronger warranty packages in LiftMaster's AC chain drive lineup. The lifetime motor term means you are not planning for a motor replacement down the line. The 5-year parts warranty covers common service items beyond the motor. For a high-use, heavy-duty opener, this coverage provides meaningful long-term protection.

The myQ platform supports geofencing through the app. You can configure the door to close automatically when your phone exits a set area. This removes the worry of leaving the door open after a busy morning. The feature requires no extra hardware and works through the standard myQ app.

Battery backup is not included on the 85870. For homeowners who want heavy-duty power and outage protection, LiftMaster's wall-mount opener line may be worth exploring. The 98032 and 98022 include battery backup and are rated for very heavy doors, though they use a different installation method. Ask a G Brothers technician to help compare these options for your specific door and garage setup.