Mighty Mule Automatic Gate Opener SystemFOR DUAL SWING... User manual

©2000 GTO, Inc.
RB928
rev - 10/03/02
Installation Manual
for the
Automatic Gate Opener System
FOR DUAL SWING GATES
WARNING!
This equipment is similar to other gate or door equipment and meets or exceeds
Underwriters Laboratory Standard 325 (UL 325). However, gate equipment has
hazards associated with its use and therefore by installing this product the
installer and user accept full responsibility for following and noting the
installation and safety instructions. Failure to follow installation and safety
instructions can result in hazards developing due to improper assembly. You agree
to properly install this product and that if you fail to do so GTO, Inc. shall in no
event be liable for direct, indirect, incidental, special or consequential damages or
loss of profits whether based in contract tort or any other legal theory during the
course of the warranty or at any time thereafter. The installer and/or user agree to
assume responsibility for all liability and use of this product releasing GTO, Inc.
from any and all liability. If you are not in agreement with this disclaimer or do
not feel capable of properly following all installation and safety instructions you
may return this product for full replacement value.
READ ALL INSTRUCTIONS CAREFULLY AND COMPLETELY before
attempting to install and use this automatic gate opener. This gate opener
produces a high level of force. Stay clear of the unit while it is operating and
exercise caution at all times.
All automatic gate openers are intended for use on vehicular gates only.
This product meets and exceeds the requirements of UL 325, the standard which regulates gate opener safety,
as established and made effective March 1, 2000, by Underwriters Laboratories Inc.
®
E-Z GATE OPENER
3121 Hartsfield Road • Tallahassee, Florida, USA 32303
Telephone GTO Sales: 1-800-543-GATE (4283) or [phone] • Fax [phone]
or GTO Technical Service: 1-800-543-1236 or [phone] • Fax [phone]
www.mightymule.com

VEHICULAR GATE OPENER CLASS CATEGORIES
Residential Vehicular Gate Opener-Class I: A vehicular gate opener (or system) intended for use in a home of
one-to-four single family dwelling, or a garage or parking area associated therewith.
Commercial/General Access Vehicular Gate Opener-Class II: A vehicular gate opener (or system) intended for
use in a commercial location or building such as a multifamily housing unit (five or more single family units),
hotel, garages, retail store, or other building servicing the general public.
Industrial/Limited Access Vehicular Gate Opener–Class III: A vehicular gate opener (or system) intended for
use in an industrial location or building such as a factory or loading dock area or other locations not intended to
service the general public.
Restricted Access Vehicular Gate Opener–Class IV: A vehicular gate opener (or system) intended for use in a
guarded industrial location or building such as an airport security area or other restricted access locations not
servicing the general public, in which unauthorized access is prevented via supervision by security personnel.
The Mighty Mule Gate Opener®is intended for use with vehicular swing gates. The opener can be used in Class I,
Class II and Class III applications.
FOR YOUR RECORDS
Please record the product serial number (located on the control box cover), and the date
and place of purchase in the spaces provided below. Refer to this information when
calling GTO for service or assistance with your automatic gate opener.
Serial Number ____________________ Date of Purchase ____________________
Place of Purchase ____________________
Remember to keep all receipts for proof of purchase.
Converting Metric Units to English Equivalents
When You Know Multiply By To Find Symbol
centimeters 0.3937 inches in. (or ")
meters 3.2808 feet ft. (or ')
kilograms 2.2046 pounds lb. (or #)
Converting English Units to Metric Equivalents
When You Know Multiply By To Find Symbol
inches 2.5400 centimeters cm
feet 0.3048 meters m
pounds 0.4535 kilograms kg
Converting Temperature
deg. Celsius (ºC x 1.8) + 32 deg. Fahrenheit ºF
deg. Fahrenheit (ºF-32) ÷1.8 deg. Celsius ºC
Conversion Chart

Gate Opener Class Categories ----------------------------------------------inside cover
Units and Standards Conversion Chart ------------------------------------inside cover
PLEASE READ THIS FIRST! ------------------------------------------------- page iii
Important Safety Instructions -------------------------------------------------- page 1
Disconnecting the Opener ---------------------------------------------------- page 1
Important Safety Instructions for the Consumer --------------------------- page 2
Secondary Means of Protection Against Entrapment --------------------- page 4
Required Safety Precautions for Gates -------------------------------------- page 5
Warning Signs and Labels ---------------------------------------------------- page 6
Installation-------------------------------------------------------------------------- page 8
Parts List ------------------------------------------------------------------------ page 8
Technical Specifications ------------------------------------------------------ page 10
Installation Overview --------------------------------------------------------- page 11
Installation of the Mounting Hardware ------------------------------------- page 12
Determining the Mounting Position ----------------------------------------- page 13
Indstalling the Post Bracket Assembly -------------------------------------- page 15
Mounting the Opener ---------------------------------------------------------- page 16
Installation of the Positive Stops --------------------------------------------- page 17
Mounting the Control Box ------------------------------------------------------ page 19
Connecting the Opener Power Cables to the Control Board------------- page 20
Mounting the Receiver ----------------------------------------------------------- page 21
DIP Switch Settings --------------------------------------------------------------- page 22
DIP Switches for Gate Sequencing ------------------------------------------ page 23
Potentiometer Settings ----------------------------------------------------------- page 24
Setting Closed Positions---------------------------------------------------------- page 25
Powering the System ------------------------------------------------------------- page 26
Setting Your Personal Transmitter Code ------------------------------------ page 30
Connecting Additional Safety Devices ---------------------------------------- page 31
Connecting Accessories ---------------------------------------------------------- page 31
Push to Open Installation ------------------------------------------------------- page 32
Maintenance & Troubleshooting Guide -------------------------------------- page 34
Warranty and Repair Service -------------------------------------------------- page 36
Column Installation Information ---------------------------------------------- page 37
Accessory Catalog----------------------------------------------------------------- page 38
4 1/2" x 4 1/2" Setback Template ---------------------------------------------- insert
Table of Contents
KEEP THESE INSTRUCTIONS FOR FUTURE REFERENCE

PLEASE READ THIS FIRST!
iii
BEFORE YOU BEGIN TO INSTALL YOUR AUTOMATIC GATE OPENER:
watch the enclosed videotape and read these instructions carefully and completely
to become familiar with all parts and installation steps.
Thank you for purchasing a Mighty Mule 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 videotape to ensure you have the correct system for your
particular needs. Furthermore, this manual and the videotape will enable you to properly install your Mighty Mule
Gate Opener®.
The Mighty Mule Gate Opener®is designed for installation on a pull-to-open dual leaf gate (gates that open into the
property). Using an accessory kit, the Mighty Mule Gate Opener®can accommodate a push-to-open dual leaf gate
(gates that open out from the property). The gate must not exceed 16 feet in length nor weigh more than 350 pounds
(please see Technical Specifications on page 10). The Mighty Mule Gate Opener®can be used on vinyl, aluminum,
chain link, farm tube, and wrought iron gates. Use on solid (wood) 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.
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 (see the enclosed Mighty Mule
Accessory Catalog) are available at most stores. Your store should be able to special order any accessory not in stock.
If your store cannot special order accessories, please call the GTO Sales Department.
The Mighty Mule Gate Opener®features adjustable obstruction sensing. This safety feature makes the gate stop
and reverse direction for 2 seconds when it comes in contact with an obstruction. MIN is the factory setting; meaning
the gate will exert the minimum force on an obstruction before it stops and reverses direction.
The Mighty Mule Gate Opener®also has an adjustable auto-close feature. After the gate reaches the fully open
position, it can be set to remain open for 1 to 120 seconds before automatically closing. Pressing the transmitter
button at any time after the gate opens fully will cause it to close immediately. OFF is the factory setting; meaning the
gate will stay open until you press the transmitter (or keypad, etc.) again.
PLEASE NOTE—If your application requires any of the following:
Swing gates longer than 16 feet or weighing more than 350 pounds;
Slide gates;
Heavy duty or commercial uses;
Professional installation;
please call GTO at (800) 543-GATE [4283] or [phone] for information about our GTO/PRO professional line
of gate openers and accessories. Our Sales Department will be glad to give you the name and phone number of a
GTO/PRO dealer near you.
®
E-Z GATE OPENER

1
IMPORTANT SAFETY INSTRUCTIONS
Because automatic gate openers produce high levels of force, consumers need to know the potential hazards associated with
improperly designed, installed, and maintained gate opener systems. Keep in mind that the gate opener is just one
component of the total gate operating system. Each component must work in unison to provide the consumer with
convenience, security, and safety.
This manual contains various safety precautions and warnings for the consumer. Because there are many possible
applications of the gate opener, the safety precautions and warnings contained in this manual cannot be completely
exhaustive in nature. They do, however, provide an overview of the safe design, installation, and use of this product.
CAREFULLY READ AND FOLLOW ALL SAFETY PRECAUTIONS, WARNINGS, AND INSTALLATION
INSTRUCTIONS TO ENSURE THE SAFE SYSTEM DESIGN, INSTALLATION, AND USE OF THIS PRODUCT.
Precautions and warnings in this manual are identified with this warning symbol. The symbol identifies conditions that
can result in damage to the opener or its components, serious injury, or death.
Because GTO automatic gate openers are only part of the total gate operating system, it is the responsibility of the
consumer to ensure that the total system is safe for its intended use.
Clevis Pin
Hairpin Clip
Washer
Gate Bracket
Front Mount
Disconnecting the Openers
1. Turn control box power switch OFF.
2. Remove hairpin clip, clevis pin, and washer from
front mount.
3. Pull front mount away from gate bracket.
Repeat steps 1 – 3 for the second opener
Your dual gate can be opened and closed manually
when the openers are disconnected.
NOTE: Substitute Pin Locks for the clevis
pins to prevent unauthorized removal of the
openers from the gate (see Accessory
catalog).
To Manually Open and Close
the Gate, Follow the Procedure
Below:
CAUTION: Disconnect the
openers ONLY when the control
box power switch is OFF and
the gate is NOT moving.

2
IMPORTANT SAFETY INSTRUCTIONS
For The Consumer
WARNING: To reduce the risk of injury or death:
1. READ AND FOLLOW ALL INSTRUCTIONS. Failure to meet the requirements set forth in the instruction
manual could cause severe injury and/or death, for which the manufacturer cannot be held responsible.
2. When designing a system that will be entered from a highway or main thoroughfare, make sure the system is placed
far enough from the road to prevent traffic congestion.
3. The gate must be installed in a location that provides adequate clearance between it and adjacent structures when
opening and closing to reduce the risk of entrapment. Swinging gates must not open into public access areas.
4. The gate and gate opener installation must comply with any applicable local codes.
I. Before Installation
1. Verify this opener is proper for the type and size of gate, its frequency of use and the proper class rating.
2. Make sure the gate has been properly installed and swings freely in both directions. Repair or replace all worn or
damaged gate hardware prior to installation. A freely moving gate will require less force to operate and will
enhance the performance of the opener and safety devices used with the system.
3. Review the operation of the system to become familiar with its safety features. Understand how to disconnect the
opener for manual gate operation (see page 1).
4. This gate opener is intended for vehicular gates ONLY. A separate entrance or gate must be installed for pedestrian
use (see page 6).
5. Always keep people and objects away from the gate and its area of travel. NO ONE SHOULD CROSS THE
PATH OF A MOVING GATE.
6. Pay close attention to the diagram below and be aware of these areas at all times.
Gate in the 
Open Position
Gate in the 
Open Position
ZONE 2
ZONE 3
ZONE 4
ZONE 5
Driveway
ZONE 1
ZONE 2
ZONE 4
ZONE 5
ZONE 3

3
IMPORTANT SAFETY INSTRUCTIONS
Entrapment Zones:
Zone 1 – leading edge of the gate and the fence post.
Zone 2 – between the gate and the gate post
Zone 3 – the path of the gate
Zone 4 – the space between the gate in the open position and any object such as a wall, fence, tree, etc.
Zone 5 – pinch points between the opener and gate or post
II. During Installation
1. Install the gate opener on the inside of the property and fence line. DO NOT install an opener on the outside of the
gate where the public has access to it.
2. Be careful with moving parts and avoid close proximity to areas where fingers or hands could be pinched.
3. Devices such as safety edges and photo beams provide additional protection against entrapment (see page 5).
4. If push buttons or key switches are installed, they should be within sight of the gate, yet located at least 10 feet from
any moving part of the gate (see diagram below). Never install any control device where a user will be tempted to
reach through the gate to activate the gate opener.
5. Do not activate your gate opener unless you can see it and can determine that its area of travel is clear of people,
pets, or other obstructions. Watch the gate through its entire movement.
6. Secure outdoor or easily accessed gate opener controls in order to prohibit unauthorized use of the gate.
Moving Gate
Area
Moving Gate
Area
Driveway
10'10'
10'10'
10'10'
NEVER INSTALL
any control device
within gray area

4
IMPORTANT SAFETY INSTRUCTIONS
III. After Installation
1. Attach the warning signs (included) to each side of the gate to alert the public of automatic gate operation. It is
your responsibility to post warning signs on both sides of your gate. If any of these signs or warning decals become
damaged, illegible or missing, replace them immediately. Contact GTO for free replacements.
2. The gate is automatic and could move at any time, posing a serious risk of entrapment. No one should be in contact
with the gate when it is moving or stationary.
3. Do not attempt to drive into the gate area while the gate is moving; wait until the gate comes to a complete stop.
4. Do not attempt to "beat the gate" while the gate is closing. This is extremely dangerous.
5. Do not allow children or pets near your gate. Never let children operate or play with gate controls. Keep the
remote controls away from children and unauthorized users; store controls where children and unauthorized users do
not have access to them.
6. KEEP GATES PROPERLY MAINTAINED. Always turn power to opener OFF before preforming any
maintenance. Clean the push-pull tube with a soft, dry cloth and apply silicone spray to it at least once per month.
7. Service the gate and gate opener regularly. Grease hinges, spray push pull tube with high quality silicon spray and
replace the battery every two (2) years.
8. To operate this equipment safely, YOU must know how to disconnect the opener for manual gate operation
(see page 1). If you have read the instructions and still do not understand how to disconnect the opener, contact the
GTO Service Department.
9. Disconnect the opener ONLY when the power is TURNED OFF and the gate is NOT moving.
10. Make arrangements with local fire and law enforcement for emergency access.
11. Distribute and discuss copies of the IMPORTANT SAFETY INSTRUCTIONS section of this manual with all
persons authorized to use your gate.
12. IMPORTANT: Save these safety instructions. Make sure everyone who is
using or will be around the gate and gate opener are aware of the dangers
associated with automated gates. In the event you sell the property with the
gate opener or sell the gate opener, provide a copy of these safety instructions
to the new owner.
Should you lose or misplace this manual, a copy can be obtained by
downloading one from the Mighty Mule web site (www.mightymule.com), by
contacting GTO, Inc., at 3121 Hartsfield Road, Tallahassee, Florida 32303 or
by calling 1-800-543-4283 and requesting a duplicate copy. One will be
provided to you free of charge.

5
IMPORTANT SAFETY INSTRUCTIONS
Secondary Means of Protection Against
Entrapment
As specified by Gate Operator Safety Standard, UL 325 (30A.1.1), automatic gate openers shall have provisions for, or be
supplied with, at least one independent primary and one independent secondary means to protect against entrapment. The
Mighty Mule utilizes Type A, an inherent (i.e., built-in) entrapment sensing system as the primary type of entrapment
protection. Also, the Mighty Mule has provisions for the connection of Type B2 protection to be used as the secondary type
of entrapment protection, if desired.
1. For gate operators utilizing a contact sensor (e.g., safety edge sensor– Type B2) in accordance with UL 325 (51.8.4 [i]):
A. One or more contact sensors shall be located at the leading edge, bottom edge, and post edge, both inside and
outside of a vehicular swing gate system.
B. A hard wired contact sensor shall be located and its wiring arranged so that the communication between the
sensor and the gate opener is not subjected to mechanical damage.
C. A wireless contact sensor such as one that transmits radio frequency (RF) signals to the gate opener for
entrapment protection functions shall be located where the transmission of the signals are not obstructed or
impeded by building structures, natural landscaping or similar obstruction. A wireless contact sensor shall
function under the intended end-use conditions.
ENTRAPMENT ALARM (UL 325; 30A.1.1A)
The Mighty Mule Gate Opener®is designed to stop and reverse approximately 2 seconds when the gate comes in
contact with an obstruction or when an object activates the non-contact sensors. Additionally, these openers are
equipped with an audio entrapment alarm which will activate if the unit obstructs twice while opening or closing.
This alarm will sound for a period of 5 minutes, or until the opener receives an intended signal (e.g., from a
transmitter) and the gate returns to a fully open or fully closed position.
Bottom Edge Contact Sensor
on both sides of the gate
Leading Edge Contact Sensor
on both sides of the gate
Post Edge Contact Sensor
on both sides of the gate
Post Edge Contact Sensor
on both sides of the gate
Vehicular GateVehicular Gate

6
IMPORTANT SAFETY INSTRUCTIONS
Install Warning Signs
Entrapment Protection
Inherent obstruction settings, even when properly adjusted, may not be sensitive enough to prevent bodily injury in some
circumstances. For this reason, safety devices such as safety edge sensors (or photoelectric sensors), which stop and reverse
gate direction upon sensing an obstruction, are suggested for augmented protection against entrapment.
Required Safety Precautions for Dual Gates
Warning Signs
The warning signs (at right) must
be installed on both sides of each
gate leaf (see page 7 for details).
Warning signs alert people of automatic gate operation and are recommended when installing the Mighty Mule Gate
Opener®. Furthermore, a walk-through gate must be installed if pedestrian traffic is expected near the vehicular gate. We
recommend using the GTO Bulldog Pedestrian Gate Lock (Call the GTO Sales Department) for controlled access.
1. KEEP CLEAR! Gate may move at any time.
2. Do not allow children to operate gate or
play in gate area.
3. This gate is for vehicles only. Pedestrians
must use a separate entrance.
Moving Gate Can Cause
Injury Or Death
WARNING
!
Warning SignWarning Sign Contact Sensor
( recommended, not included )
Contact Sensor
( recommended, not included )
Pedestrian Gate
Bulldog Pedestrian
Gate Lock
(recommended, not included )
Vehicular GateVehicular Gate
Contact Sensor
( recommended, not included )
Contact Sensor
( recommended, not included )