Nortek Security & Control MIGHTY MULE MM272 User manual

Copyright©2019 Nortek Security & Control, LLC 10022113 A
MM272
This product meets the requirements of UL325, the standard for gate operator safety.
Installation Manual
Example of nished installation
(installations vary slightly on different types of gates)
120 Volt indoor
Transformer
(surge protector
not supplied) Horizontal Support
Gate Swings Evenly and Freely
Hung Firmly and Plumb
Post Bracket
Control Box
Fence Post Set in Concrete
Run 1000' (max.) of low
voltage wire to control
box from transformer
(wire not included).
Power Cable
Gate Bracket
Warning Sign
First Gate Opener
Post Bracket
Second Gate Opener
Gate Bracket
Horizontal Support
PVC conduit (not included)
to run second opener power
cable under driveway.
12 Volt automotive or marine
type battery in weather proof
housing (REQUIRED, not included).
Mighty Mule® is the retail brand of Nortek Security & Control, LLC
NSC Sales: 800-543-4283 • Fax [phone]
NSC Technical Service 800-543-1236
For Online Technical Support 24 hour/day, 7 day/week visit www.mightymule.com
For more information on Mighty Mule’s full line of Automatic Gate Operators and
Access Controls visit www.mightymule.com

BMM272 Installation Instructions
Product Usage
The Mighty Mule Gate Operator meets all of the safety requirements of a Class I Residential Vehicular Gate Operator and is
intended for use solely with vehicular swing gates in single-family residential applications that meet the Class I category listed in
the table below.
WARNING
This equipment meets 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 Nortek Security & Control, LLC, shall in no event be liable
for direct, indirect, incidental, special or consequential damages or loss of prots 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 Nortek Security &
Control, LLC, 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 operator. This gate operator produces a high level of force. Stay clear of the unit while it
is operating and exercise caution at all times.
ALL AUTOMATIC GATE OPERATORS ARE INTENDED FOR USE ON VEHICULAR GATES ONLY.
Vehicular Gate Operator Class Categories
Residential Vehicular Gate Operator-Class I:
A vehicular gate operator (or system) intended for use in
garages or parking areas associated with a residence of
one-to-four single families.
Commercial/General Access Vehicular Gate Operator-
Class II: A vehicular gate operator (or system) intended
for use in a commercial location or building such as a
multi-family housing unit (ve or more single family
units), hotel, garages, retail store, or other buildings
accessible by or servicing the general public.
Industrial/Limited Access Vehicular Gate Operator–
Class III: A vehicular gate operator (or system) intended
for use in an industrial location or building such as
a factory or loading dock area or other locations not
accessible by or intended to service the general public.
Restricted Access Vehicular Gate Operator–
Class IV: A vehicular gate operator (or system) intended
for use in an industrial location or building such as
a factory or loading dock area or other locations not
accessible by or intended to service the general public.

MM272 Installation Instructions i
Table of Contents
Please Read This First!..................................................................................................... ii
Manually Opening and Closing Gate............................................................................ iii
Important Safety Information ........................................................................................ iii
For the Installer and End User ...................................................................................... iv
Installing Warning Signs and Pedestrian Gates .......................................................... viii
Required Safety Precautions for Gates ......................................................................... ix
Technical Specications .................................................................................................1
Before You Begin................................................................................................................2
Solar Panel and Gate Activity Chart ...............................................................................2
Parts List – Opener and Mounting Hardware .................................................................4
Tools and Materials.........................................................................................................5
Installation Overview for Pull-To-Open Gates...............................................................6
Installation of the FIRST Gate Opener............................................................................7
Install Post Bracket Assembly and Gate Bracket............................................................8
Attach Opener Arm.......................................................................................................10
Install the Closed Position Stop Plates .........................................................................11
Mount the Control Box.................................................................................................12
Connect Opener Power Cables .....................................................................................13
Connect the Transformer ..............................................................................................13
Connect Battery Harness to Control Board ..................................................................15
Connect the Battery ......................................................................................................16
Set the CLOSED Position Limit for PULL-TO-OPEN Installation.............................16
Setting Dual Sense Detection and Auto Close Timer ..................................................17
Personalize Your Transmitter Setting ...........................................................................18
Push-To-Open Installation Instructions.........................................................................19
Solar Panel Instructions ..................................................................................................21
Connecting Additional Devices .......................................................................................22
Troubleshooting Guide ....................................................................................................24
Maintenance .....................................................................................................................25
Warranty Repair............................................................................................................25
Accessories ........................................................................................................................26
Gate Operator Installation Checklist.............................................................................28

ii MM272 Installation Instructions
BEFORE YOU BEGIN TO INSTALL YOUR AUTOMATIC GATE OPERATOR:
Watch the enclosed video and 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
operator safety and proper use of the gate operator.
Please Read This First!
Thank you for purchasing a Mighty Mule Gate
Operator—the "do-it-yourself" automatic gate
operator! When correctly installed and properly used,
your Mighty Mule Gate Operator 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 DVD will
enable you to properly install your Mighty Mule Gate
Operator.
The MM272 Operator is designed for installation on
a pull-to-open dual leaf gates (gates that open into
the property). By purchasing the accessory brackets,
the Mighty Mule Gate Operator can accommodate a
push-to-open dual leaf gates (gates that open out from
the property). The gate must not exceed 12 feet in
length and weigh more than 300 pounds (please see
Technical Specications on page 1). The Mighty Mule
Gate Operator 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 operator will obstruct and stop, and may
damage the opener.
The Mighty Mule Gate Operator accommodates
extra transmitters, digital keypads, solar panels,
push buttons, automatic gate locks, and other access
control products. These optional accessories (see the
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 Mighty Mule Sales
Department (800-543-GATE).
The Mighty Mule Gate Operator features Dual Sense
Technology™. This feature makes the gate stop and
reverse direction when it comes in contact with an
obstruction. This is factory set to the most sensitive
setting and must be adjusted during installation.
The Mighty Mule Gate Operator also has an adjustable
auto-close feature. After the gate reaches the fully
open position, it can be set to remain open up 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.
Go to www.mightymule.com or call [phone]
to nd a retailer near you. For information about our
professional line of gate operators and accessories,
visit www.linearproaccess.com.

MM272 Installation Instructions iii
NOTE: Substitute a Pin Lock for the clevis pin on the front mount
of the gate operator to prevent unauthorized removal of the operator
from the gate (see accessory pages in back of this book).
CAUTION
The gate will move freely and uncontrolled when the gate operator is removed from the gate. ONLY disconnect
the operator when the control box power switch is OFF and the gate is NOT moving.
Because automatic gate operators produce high levels
of force, consumers need to know the potential hazards
associated with improperly designed, installed, and
maintained automated gate operator systems. Keep in
mind that the gate operator is just one component
of the total gate operating system. Each component
must work in unison to provide the end user with
convenience, security, and safety.
This manual contains various safety precautions and
warnings for the installer and end user. Because there
are many possible applications of the gate operator,
the safety precautions and warnings contained in
Disconnecting the Operator
1. Turn control box power switch OFF.
2. Remove hairpin clip, clevis pin, and bushing from either the
front or rear mounting point.
3. Remove the operator from the mount.
The gate can be opened and closed manually when the operator is
disconnected.
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.
Warnings in this manual are identied with
this warning symbol. The symbol identies
conditions that can result in damage to the operator or
its components, serious injury, or death.
Manually Opening and Closing Gate
Because Mighty Mule automatic gate operators are only part of the total gate operating system, it is the
responsibility of the installer and end user to ensure that the total system is safe for its intended use.
Important Safety Information
Clevis Pin
Hairpin Clip
Gate Bracket
Front Mount

iv MM272 Installation Instructions
Entrapment Zones for a
Pull-To-Open Application
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
I. Before Installation
1. Verify this operator is proper for the type and size of gate,
frequency of use and class of the gate system.
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 entrapment protection devices used with
the system (see Prepare the Gates on page 3).
3. Review the operation of the system to become familiar with
its safety features. Understand how to disconnect the operator
for manual gate operation (see page iii).
4. The gate and operator installation must comply with any
applicable local codes.
5. This gate operator is intended for vehicular gates only. A
separate entrance or gate must be installed for pedestrian use
(see page viii).
6. Always keep people and objects away from the gate and its
area of travel. No one should cross the path of a moving gate.
7. Identify all of the entrapment zones for the type of
installation. An entrapment zone is an area around the
automatic gate system where a person or object could be
caught that increase the risk of injury. Entrapment zones must
be eliminated, guarded or protected.
8. When designing a system that will be entered from a highway
or main thoroughfare, make sure the gate system is placed far
enough from the road to prevent trafc congestion.
For the Installer and End User
Important Safety Information
WARNING
To reduce the risk of injury or death:
1. READ AND FOLLOW ALL INSTRUCTIONS.
2. Never let children operate or play with gate controls. Keep
the remote control away from children.
3. Always keep people and objects away from the gate. NO
ONE SHOULD CROSS THE PATH OF THE MOVING
GATE.
4. Test the gate operator monthly. The gate MUST reverse on
contact with a rigid object or stop when an object activates
the non-contact sensors. After adjusting the force or the limit
of travel, retest the gate operator. Failure to adjust and retest
the gate operator properly can increase the risk of injury or
death.
5. Use the manual/emergency release only when the gate is not
moving.
6. KEEP GATES PROPERLY MAINTAINED. Read the
user’s manual. Have a qualied service person make repairs
to gate hardware.
7. The entrance is for vehicles only. Pedestrians must use
separate entrance.
8. 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.
9. SAVE THESE INSTRUCTIONS.

MM272 Installation Instructions v
Pull-To-Open Application
Moving Gate
Area
Moving Gate
Area
Driveway
10'10'
10'10'
10'10'
NEVER INSTALL
any control device
within gray area
II. During Installation
1. Install the gate operator on the inside of the
property and fence line. DO NOT install an
operator 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 ngers or hands could
be pinched.
3. Devices such as contact sensors (sensing
edges) and non contact sensors (photo beams)
provide additional protection against vehicular
damage.
4. If push buttons or key switches are installed, they
should be within sight of the gate, 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 operator.
5. Do not activate your gate operator 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 operator
controls in order to prohibit unauthorized use of
the gate.
For the Installer and End User
Typical Entrapment Zones are shown in the diagrams on page iv:
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 operator and gate.
Important Safety Information

vi MM272 Installation 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 becomes damaged,
illegible, or missing, replace them immediately.
Contact NSC for free replacements.
2. The gate is automatic and could move at any
time, posing 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 control away from
children and unauthorized users; store controls
where children and unauthorized users do not
have access to them.
6. KEEP GATE SYSTEMS MAINTAINED.
Always turn power to operator OFF before
performing any maintenance. See page 26 for
maintenance procedures.
7. To operate this equipment safely, YOU must
know how to disconnect the operator for manual
gate operation (see page iii). If you have read the
instructions and still do not understand how to
disconnect the operator, contact the Mighty Mule
Service Department.
8. Disconnect the operator ONLY when the power
is TURNED OFF and the gate is NOT moving.
9. Make arrangements with local re and law
enforcement for emergency access.
10. Distribute and discuss copies of the
IMPORTANT SAFETY INFORMATION
section of this manual with all persons
authorized to use your gate.
11. IMPORTANT: Save these safety instructions.
Make sure everyone who is using or will be
around the gate and gate operator are aware
of the dangers associated with automated gate
systems. In the event you sell the property
with the gate operator or sell the gate operator,
provide a copy of these safety instructions to
the new owner.
Should you need a replacement manual, a copy
can be obtained by downloading one from the
Mighty Mule web site (www.mightymule.com),
by contacting NSC by calling 1-800-543-4283
and requesting a duplicate copy. One will be
provided to you.
For the Installer and End User
Important Safety Information

MM272 Installation Instructions vii
For the Installer and End User
Important Safety Information
Mighty Mule gate operators utilize Dual Sense
Technology™ entrapment protection. Dual Sense
Technology™ is built into every Mighty Mule and
provides redundant methods of entrapment protection
for open and close gate directions.
In addition to Dual Sense Technology, every Mighty
Mule gate controller has provisions for the connection
of additional obstruction detection devices such as
sensing edges and photo beams.
These devices may be located where there is an
increased risk of obstruction. Refer to the diagram
below.
One or more edge sensors may be located at the
leading edge, bottom edge, and post edge, both inside
and outside of a vehicular swing gate system.
Wiring to sensors must be located and arranged so the
wiring between the sensor and the gate operator is not
subjected to mechanical damage.
A wireless sensor such as one that transmits radio
frequency (RF) signals to the gate operator for
obstruction protection functions shall be located
where the transmission of the signals is not blocked or
impeded by building structures, natural landscaping or
similar objects.
Entrapment Alarm
The Mighty Mule Automatic Gate Operator is designed to stop and reverse the gate when the gate comes in contact with
an obstruction. Additionally, these operators 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 operator receives
an intended signal from a hard wired entry/exit source (e.g. push button control or keypad) and the gate returns to a fully
open or fully closed position. Turning the power switch on the control box OFF and back ON will also deactivate the
alarm. Wireless controls such as transmitters and wireless keypads will not deactivate the alarm.
Entrapment and Obstruction Protection
Mighty Mules’ Dual Sense Technology™ provides entrapment protection when properly adjusted. Since all installations
are different, you may need to add photo beams or sensing edges to help prevent damage to vehicle or other items that
could be hit by a moving gate.
Vehicular GateVehicular Gate
Photo Beam
(recommended, not included)
Photo Beam
(recommended, not included)
Sensing Edges
(recommended, not included)
Sensing Edges
(recommended, not included)
Leading Edges
of gates

viii MM272 Installation Instructions
Warning SignWarning Sign
Pedestrian Gate
Pedestrian Gate Lock
(recommended, not included)
Vehicular GateVehicular Gate
7 foot
minimum
Important Safety Information
Warning signs alert people of automatic gate operation and are required when installing Mighty Mule Automatic
Gate Operators. A minimum of two WARNING SIGNS must be installed in the area of the gate. Each sign is to be
visible by persons located on the side of the gate on which the placard is installed.
The operator is intended for installation only on gates used for vehicles. Pedestrians must be supplied with a
separate access opening. The pedestrian access opening shall be designed to promote pedestrian usage. Locate
the gate such that persons will not come in contact with the vehicular gate during the entire path of travel of the
vehicular gate.
We recommend using the NSC Pedestrian Gate Lock (Call the NSC Sales Department at 800-543-4283) for
controlled access.
Installing Warning Signs and Pedestrian Gates
Warning Signs
The gate operator is provided with 2 safety warning signs.
The signs MUST be installed on the front and back of the
gate where they will be visible in the area of the gate.
Permanently secure each warning sign to the gate.
Immediately replace a damaged or missing warning sign.
!

MM272 Installation Instructions ix
Important Safety Information
Required Safety Precautions for Gates
These warning labels should be found at the locations specied below. If any of them are missing, immediately
contact NSC for replacements.
Product identication label (1) installed on the side of the Control box.
Labels (1) installed on the front of control box
Control arm label (2) installed on operator arm
mightymule.com
MM571W
10019674A
1. KEEP CLEAR! Gate may move at any time.
2. Read all SAFETY INSTRUCTIONS in the user’s manual.
3. Do not allow children to operate gate or play in gate area.
4. This gate is for vehicles only. Pedestrians must use separate entrance.
Moving gate can cause injury or death!
1. TENEZ-VOUS LOIN! La barrière peut se déplacer à tout moment.
2. Lisez toutes les instructions de sécurité dans le manuel de l'utilisateur.
3. Ne laissez pas les enfants utiliser la barrière ou jouer à proximité de la barrière.
4. Cette barrière est uniquement réservée aux véhicules. Les piétons doivent
utiliser une autre entrée.
AVERTISSEMENT
WARNING
La barrière en mouvement peut provoquer des
blessures graves ou la mort!
10019665A
GEN7 SERIES – DC Swing Gate Operator
P/N MM571W
Conforms to UL STD 325 • Certied to CSA STD C22.2 No.247
Maximum Gate: 300 lb. (136 kg); 12 ft. (3.65 m)
Voltage: 12 Vdc; Frequency: 0 Hz; Power: 25 W
Class I Vehicular Gate
S/N: YYYYMMDDx0000
Nortek Security & Control – Carlsbad, CA USA
E472888

1MM272 Installation Instructions
MIGHTY MULE MM272 DUAL GATE OPENER
_____________________________________ DRIVE _____________________________________
• Low friction screw drive (linear actuator) rated for -5 °F to +160 °F (-20 °C to +71 °C).
• Powered by a 12 V motor with integral case hardened steel gear reducer. Motor speed reduced to 260 rpm. Generates
520 inch lb. of torque at 12 V.
• Maximum opening arc of 110°. Approximate opening time (90°): 18 seconds, depending on weight of gate.
_____________________________________ POWER _____________________________________
• The system is powered by a 12 Vdc automotive, lawn tractor or marine battery (required but not included).
• Battery charge is 120Vac to 16Vac output through the control board] or by optional Solar Panels; the panel should
generate minimum of 10 Watts (600 mA). A diode on the control board prevents battery discharge. IMPORTANT:
Never use both transformer and solar panel— this will damage the battery and control board.
• One (1) blade-style fuse is rated for 15A.
NOTE: The transformer should not be directly connected to any battery. Do not replace fuses with
higher ampere rated fuses; doing so will void your warranty and may damage your control board.
_____________________________________ CONTROL _____________________________________
• Microprocessor-based control board is set for dual leaf, pull-to-open gate installations. Jumper can be removed to
accommodate an optional kit for push-to-open gates.
• Control board has temperature compensated circuits.
• Auto-memorization of digital transmitter code.
• Opener length with push-pull tube fully retracted is 26 3/8", mounting point to mounting point. Maximum stroke is 13".
• Adjustable auto-close timer (OFF to 3–120 seconds), and Dual Sense Technology™ stall force).
• Power terminal block accommodates a transformer or solar panels.
• Accessory terminal block fully compatible with all Mighty Mule access controls.
• Control board allows connection of edge sensors and photoelectric sensors.
• Audio entrapment alarm sounds if unit encounters an obstruction twice while opening or closing.
_____________________________________ OPERATIONAL CAPACITY _____________________________________
• Maximum gate size: 300 lbs., 12' long.
NOTE: BALL BEARING HINGES SHOULD BE USED ON ALL GATES WEIGHING OVER 250 LB.
Technical Specifications

Solar Panel and Gate Activity Chart
MM272 Installation Instructions 2
1. Determine Charging Options for Battery: Transformer OR Solar
IMPORTANT
• The Mighty Mule 272 is designed and intended for use with a 12 Volt automotive, marine or lawn tractor battery. The
battery must be placed inside a weatherproof case and located within 6' of the control box. The 8' battery harness
connects the battery to the control board.
• The battery charge is maintained by the 16 Volt transformer included OR optional solar panel(s). The transformer OR
solar panel is connected to the control board using low voltage, 16 gauge, dual conductor, multi-stranded, direct burial
wire [RB509] (page 26).
• All low voltage wire used with the Mighty Mule Gate Opener must be 16 gauge dual conductor, multi-stranded, direct
burial wire.
• The transformer is intended for indoor use. If the transformer can only be plugged into an outside electrical outlet, a
weatherproof cover or housing must be used.
• If your gate is more than 1000' from an AC power source, you will need to use a solar panel charging kit (minimum 10
watts) . Refer to the Solar Panels and Gate Activity Chart below.
The table and map illustrate the
maximum number of gate cycles
to expect per day in a particular
area when using from 10 to 20 watts of solar
charging power prior to the battery depleting to a
state where the unit will not function. The gures
shown are for winter (minimum sunlight) and do
not account for the use of any accessory items.
Accessories connected to your system will
draw additional power from the battery and
will require additional solar panels.
A deep cycle marine battery is recommended for
solar and/or high trafc applications.
NOTE: UP to 250 ft. of dual conductor, 16
gauge, multi-stranded wire may be used to allow
installation of solar panels in direct sunlight.
See page 21:
10 Watt Solar Panel [FM123]
Dual Gate
Winter Ratings Zone 1 Zone 2 Zone 3
10 Watts 8 16 26
20 Watts 14 28 38
NEVER USE TRANSFORMER AND SOLAR PANEL(S) AT THE SAME TIME!
It will damage the control board!
Before You Begin

3MM272 Installation Instructions
2. Check Direction of Gate Swing
The Mighty Mule 272 is designed for PULL-TO-OPEN
installations. PUSH-TO-OPEN installations require two
Push-To-Open brackets [FM148]. Push-to-Open Installation
Instructions begin on page 27.
3. Prepare the Gates
• Gates must be plumb, level, and swing freely on their
hinges.
• Wheels must NOT be attached to the gates.
• The gates must move throughout their arcs without
binding or dragging on the ground.
• Note that gates over 250 lb. should have ball bearing hinges with grease ttings.
• The gate post should be secured in the ground with concrete so it will minimize twist or ex when the opener is activated.
• The addition of a horizontal or vertical cross member (if one is not already in place) to provide a stable area for mounting
the gate bracket is also important.
• Trench the driveway in order to lay PVC conduit for the second opener power cable (see illustration on page 6).
Your Property Your Property
Pull-To-Open
(arm retracts to open)
Push-To-Open
(arm extends to open)
Horizontal Cross Member
Vertical Cross Member
E
A
B
C
D
F
A – Level D – Posts Secured in Concrete
B – Plumb E – Centerline Mounting
C – Free Swinging F – Good Working Hinges
Gate Grounding (recommended)
• Shorter wire (6 AWG) is better, 1 to 2 feet recommended.
• Bolt ring terminal at end of cable 4 - 6 inches above
ground level.
NOTE: No grounding system absolutely protects against
lightning strikes. If installed correctly, a grounding system
will help minimize damage to your gate opener.
Copper clad ground rod
(not included)
Ground
Ground
2 Inches or
Less above
ground
Copper ground
rod clamp
Copper Single
Conductor Lug
3/16” Drilled
Pilot Hole
6 ft. deep
or more
Metal gate post
Metal Gate Post
12awg or Larger
Gate Opener
Control Box
2 ft. or Less
from post

MM272 Installation Instructions 4
Parts List – Opener and Mounting Hardware
Hairpin Clip (4)
3/8" x 1-1/2" Clevis Pin (4)
5/16" x 1-1/4" Bolt (2)
3/8" x 1-1/4" Bolt (2)
3/8" x 2-3/4" Bolt (4)
3/8" x 8" Bolt (4)
8" Nylon Cable Tie (20)
3/8" Washer (14)
5/16" Washer (2)
3/8" Nut (10)
5/16" Lock Nut (2)
Hardware Bag Contents
Gate Opener (2)
Gate Bracket (2)
Post Pivot Bracket (2)
3/8" Lock Washer (10)
Literature Kit
Post Bracket (2)
Closed Position
Stop Plate (2)
2" Mounting Screw (3)
®
E-Z GATE OPENER
Transformer (1)
RB503
Battery Wire
Harness with
15A fuse (1)
Warning Signs (2)
Transmitter(1)
MMT103
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
!
Control Box (1)

5MM272 Installation Instructions
Tools and Materials
Tools Needed:
• Power Drill
• Open End Wrenches — 1/2" and 9/16"
• Adjustable Wrench
•
3/8" Drill Bit
• Hacksaw or Heavy Duty Bolt Cutters
• Small Flat Bladed Screwdriver
• Large Phillips Screwdriver
• Tape Measure
• Level
• Wire Strippers
• C-Clamps — small, medium, and large
• Center Punch
• Hammer (for center punch)
• Extra person will be helpful
Materials You May Need for the Installation:
These items are NOT included with the gate opener kit. Some of these items can be purchased or special ordered through
participating retailers. Please see page 26 or www.mightymule.com
• 12 VDC automotive/lawn tractor or deep cycle marine battery is required to power the opener. (page 2)
• Low voltage wire [RB509] will be needed to run from the transformer to the opener control board; length depends upon the
distance between the transformer power supply and the control box. (page 13 & 20)
• If your gate is more than 1000' away from an AC power source you will need to use at least one 10 watt Solar Panel [FM123]
to charge the 12 Volt battery. (page 2 & 26)
• PVC conduit for protecting in ground wiring. (page 6)
• Push-To-Open Brackets [FM148] are required if gates open out from property. (page 3 & 20)
• Materials to reinforce thin walled tube or panel gates. (page 7)
• Depending on the type of gate, a horizontal cross member or mounting plate may be needed to mount the front of the opener
and gate bracket to the gate. (page 3 & 7)
• Some installations may require mufer clamps for the gate bracket, to prevent drilling into thin wall tube gates. (page 7)
• (2)16 AWG crimp on fork lugs. (page 15)
• Surge protection for transformer. (page 16)
• Weather proof outlet and cover is required if transformer is plugged into outside outlet. (page 16)
• Some types of installations require U-Bolts for closed position stop plate. (page 11)
• A low prole ground stop is required for dual gates when using the Mighty Mule gate lock. (page 11)
NOT ALL TOOLS ARE SHOWN

MM272 Installation Instructions 6
If the gate post is larger than
6" the Post Pivot Bracket can
be removed and the center
hole of the Post
Bracket can be the
mounting point for
the gate opener.
Center hole of
post bracket
Installation Overview for Pull-To-Open Gates
PUSH-TO-OPEN installation instructions begin on page 19.
Example of an installation on a chain link fence:
IMPORTANT: To achieve the most efcient
leverage for the gate opener and ensure long
trouble free service, the gate opener needs to be
installed within the following parameters.
The diagram at left shows the optimum position
for gate opener arm in relation to the gate in the
open and closed positions. Be sure the position
of the gate opener and brackets allows for 1" of
clearance between the gate and the opener in both
the open and closed position, at the same time
maintaining a stroke distance of 7" to 13" from
center of hole in the end of the retracted opener
arm to the center of the hole in the gate bracket
with the gate in the closed position.
36' power cable allows the control
board to control the SECOND gate
opener (run in PVC conduit)
You will need to trench across the
driveway in order to lay conduit for
the second opener power cable.
120 Volt indoor
Transformer
(surge protector
not supplied)
Fence Post
Set in Concrete
Run 1000' (max.) of low
voltage wire to control
box from transformer
(wire not included).
PVC conduit (not included)
to protect wire from lawn
mowers and weed eaters.
Gate Swings Evenly and Freely
Hung Firmly and Plumb
Control Box
First Opener Second Opener
Closed Position Stop Plates
Gate Bracket
12 Volt automotive or marine
type battery in weather
proof housing (REQUIRED,
not included).
1" minimum
Gate in the
OPEN POSITION
Pinch Area
Gate in the
CLOSED POSITION
Pinch Area
1" minimum
7 to 13”
stroke

7MM272 Installation Instructions
IMPORTANT: Determine which side of the driveway you will mount the control box. From this point on, the gate and gate
opener on the same side as the control box will be referred to as the FIRST gate and gate opener. The gate and gate opener on the
opposite side of the driveway from the control box will be referred to as the SECOND gate and gate opener.
We recommend you position the opener near the centerline of the gate to keep the gate from twisting and exing and to avoid
back splash from rain water.
The Post Bracket Assembly
The position of the post bracket assembly determines the
leverage and efciency of the opener. The post bracket
assembly position also sets the clearance between the
opener and the gate in the open and closed positions.
The post bracket works well for installations on round
and square fence posts. Because the post bracket
carries the entire thrust of the active opener, bolts must
completely penetrate the post.
On wood posts, place a metal plate or washer (not
supplied) between the nuts and the post to prevent the
thrust of the opener from pulling the bolts and washers
out of the wood.
The post pivot bracket may not be necessary on posts
larger than 6" in diameter (see page 6). Fence posts
smaller than 6" in diameter or 6" square should be made
of metal instead of wood to remain stable while the
opener is moving the gate.
Reinforcing Gates for the Gate Brackets
We recommend using a mufer clamp, wood, or metal, to reinforce thin-walled tube gates, or wood to reinforce panel gates as
shown. These reinforcement methods will prevent damage to the opener and gate. Additional hardware may be needed depending
on the installation.
Mufer Clamp for
Gate Bracket
Wood or Metal
Reinforcement
1" x 6" Wood
Reinforcement
Post
Bracket
Post
Pivot Bracket
Metal Plate
Wooden Post
Post
Bracket
Post
Pivot Bracket
Metal Plate
Wooden Post
Post Pivot
Bracket
Post
Bracket
Post Bracket
Assembly
Thin Walled
Tube Gate
Gate Bracket
Muffler Clamp
(not supplied)
Gate Bracket
Wood or Metal
Reinforcement
(not supplied)
Gate
Bracket
Panel
Gate
1" x 6"
Wood
Reinforcement
Installation of the FIRST Gate Opener

MM272 Installation Instructions 8
Install Post Bracket Assembly and Gate Bracket
Step 1
Insert the 3/8" x 11/4" bolt through the center hole of the post brackets and post
pivot bracket. Secure with a 3/8" washer, 3/8" lock washer and 3/8" nut. DO NOT
overtighten the nut (the post pivot bracket will have to be adjusted later).
Step 2
Attach post bracket assembly to the rear mount of the opener with a clevis pin.
Secure the clevis pin with a hairpin clip.
Step 3
Attach gate bracket to the front mount of the opener with a clevis pin. Secure the
clevis pin with a hairpin clip.
Step 4
With the gate in the fully open position and the opener arm fully retracted,
adjust the post bracket assembly and gate bracket until the opener is level. While
holding the opener level, use C-clamps to temporarily secure the post bracket
assembly and gate bracket to the post and gate.
3/8" x 11/4" Bolt
3/8" Nut
Post Pivot Bracket
Post Bracket
Post Bracket Assembly
3/8" Washer
3/8" Lock Washer
Clevis Pin
Hairpin Clip
Post Bracket Assembly
Rear Mount
Opener
Clevis
Pin
Hairpin Clip
Gate Bracket
Front Mount
Fence Post
Gate in Open Position
Opener Arm Fully Retracted
LEVEL horizontal cross member
Post Bracket Assembly
Gate Bracket
Level Opener

9MM272 Installation Instructions
Step 5
Be sure the position of the gate opener and brackets
allows for 1" of clearance between the gate and the
opener in both the open and closed position, while
at the same time maintaining a stroke distance of 7"
to 13" from center of hole in the end of the retracted
opener arm to the center of the hole in the gate bracket
with the gate in the closed position. This mounting
position will give the opener the most efcient
leverage point for operation and provides the least
possible pinch area.
Step 6
After verifying that you have the best position for
the post pivot bracket in the open position, insert the
5/16" x 11/4" bolt through the aligned holes of the
post bracket and post pivot bracket to hold it in place.
Remove the clevis pin from the front mount and
while supporting the gate opener, swing the gate
and gate opener to the closed position. Again, check
the clearance and be sure that the gate opener is not
binding at the post pivot bracket.
If you don't have the required clearance, or if the gate
opener is binding on the post pivot bracket, remove the
5/16" x 11/4" bolt and readjust the post pivot bracket.
Reinstall the bolt and related hardware as shown in the
diagram to the right.
TIP: Turn the post pivot bracket over for more hole
alignment options. You can also move the entire post
bracket assembly to different positions on the post.
If you are mounting to a post or column larger than
8" or you can not achieve the mentioned clearances,
you can:
1) eliminate the post pivot to try and achieve the proper clearances.
2) install the unit as a push to open (bracket not included).
3) re-hang the gate within 4" inches of the back corner of the column.
NOTE: Re-hanging the gate, depending on the construction of a column, may
require additional expertise and tools/materials.
Step 7
When the post bracket assembly is in the optimum position, reattach the opener to
the gate bracket (gate in the open position); recheck the gate opener level; make sure
the brackets are clamped securely.
Step 8
Mark reference points for bolt holes on the post through
middle of post bracket assembly slots. Mark reference points
for bolt holes on the gate cross member through middle
of gate bracket slots. After marking your reference points,
remove the opener and brackets from the fence and gate.
1" minimum
Gate in the
OPEN POSITION
Pinch Area
Gate in the
CLOSED POSITION
Pinch Area
1" minimum
7” to 13"
stroke
Be sure gate opener
and bracket don't bind.
5/16" x 11/2"
Bolt
Post Pivot
Bracket
Determine Best
Hole Alignment
to Achieve
1" Clearance
Post Bracket
5/16" Lock Nut
5/16" Washer
Post Bracket
Assembly
Mark fence post through
middle of bracket slots
and drill 3/8" holes through
post.
Gate In Open Position
Arm Fully Retracted
LEVEL horizontal cross member
Mark cross member through middle of gate
bracket slots and drill 3/8" holes through cross member.