Mighty Mule MM402 - Manual (Page 4)

ii Mighty Mule FM402 Installation Instructions rev 082211
Thank you for purchasing a Mighty Mule FM402 Gate Opener—GTO’s “do-it-yourself” automatic gate opener!
When correctly installed and properly used, your Mighty Mule Gate Opener will give you many years of reliable
service. Please read the following information and watch the enclosed video to ensure you have the correct
system for your particular needs. Furthermore, this manual and the video will enable you to properly install
your Mighty Mule Gate Opener.
The Mighty Mule Gate Opener is designed for installation on Pull-To-Open dual gate leaves (gates that
open into the property). By purchasing accessory brackets [FM148], the Mighty Mule Gate Opener can
accommodate Push-To-Open dual gate leaves (gates that open out from the property). Please see Pull-To-
Open/Push-To-Open diagram on page 3. The gates must not exceed 12 ft. or 300 lbs. per leaf (see Technical
Specifications on page 1). The Mighty Mule Gate Opener can be used on vinyl, aluminum, chain link, farm
tube, and wrought iron gates.
Use on solid (surface) gates is not recommended. Solid surface gates have a high resistance
to the wind. If the wind is strong enough, the opener will obstruct and stop, blow fuses, or
may damage the equipment.
The Mighty Mule Gate Opener features an adjustable stall force setting. This safety feature makes the gate
stop and reverse direction within 2 seconds when it comes in contact with an obstruction. The MIN setting
means the gate will exert the minimum force on an obstruction before it stops and reverses direction. You will
need to adjust the stall force for your particular application.
The Mighty Mule Gate Opener also has an adjustable auto-close feature. After the gate reaches the fully
open position, it can be set for OFF, or to remain open up from 3 to 120 seconds before automatically closing.
Pressing the transmitter button at any time after the gate opens fully will cause it to close immediately. The
auto-close factory setting is OFF, meaning the gate will stay open until you press the transmitter (or keypad,
etc.) again.
The Mighty Mule Gate Opener accommodates extra transmitters, digital keypads, solar panels, push buttons,
automatic gate locks, and other access control products. These optional accessories (page 26) are available
Special Order (if the accessory is not in stock). If your store cannot special order accessories, please call the
GTO Sales Department (850/575-0176) or visit www.mightymule.com.
PLEASE NOTE—If your application requires any of the following:
Column Mounting
Slide gates
Swing gates longer than 12 feet or weighing more than 300 pounds
Professional installation
please call GTO at 800-543-4283 or 850-575-0176 for information about our GTO/ACCESS SYSTEMS
professional line of gate openers and accessories. Our Sales Department will be glad to give you the
name and phone number of a GTO/ACCESS SYSTEMS dealer near you.
BEFORE YOU BEGIN TO INSTALL YOUR AUTOMATIC GATE OPENER:
Read these instructions carefully and completely to become familiar with all parts and installation steps.
The video is only designed as an overview of the installation procedure. You must read the installation
manual for detailed instructions on gate opener safety and proper use of the gate opener.
PLEASE READ THIS FIRST