Mighty Mule MM660 User manual

Horizontal Support
Gate Swings Evenly and Freely
Hung Firmly and Plumb
Receiver
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 Closed Position Stop Plate
PVC conduit (not included)
to protect wire from lawn
mowers and weed eaters.
12 Volt automobile or marine
battery in a weatherproof
battery box (not included).
Gate Bracket
Warning Sign
Single Gate Opener
120 Volt indoor
Transformer
(surge protector
not supplied)
Printed in China for GTO Access Systems, LLC. Copyright©2016 GTO Access Systems, LLC
Document Number: R66008 REV A (12-19.16)
GTO Sales: 800-543-4283 • Fax [phone]
GTO Technical Service 800-543-1236
For 24 hour/day, 7 day/week Technical Service visit http://support.gtoinc.com
For more information on Mighty Mule’s full line of Automatic Gate Operators and Access Controls visit
www.mightymule.com
MM660
ACCESS SYSTEMS, LLC
Mighty Mule® is the retail brand of GTO Access Systems, LLC
3121 Hartseld Road • Tallahassee, FL 32303
This product meets the requirements of UL325 6th Edition, 2016, the standard for gate
operator safety.
Installation Manual
Example of nished installation
(installations vary slightly on different types of gates)

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.
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.
Vehicular Gate Operator Class Categories
i
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 GTO Access Systems, 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 GTO
Access Systems, 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.

Table of Contents
PLEASE READ THIS FIRST ________________________________________________________ 1
IMPORTANT SAFETY INFORMATION _______________________________________________ 2
TECHNICAL SPECIFICATIONS _____________________________________________________ 9
BEFORE YOU BEGIN ____________________________________________________________ 10
Check Direction of Gate Swing ___________________________________________________ 10
Check Existing Gate Size and Material _____________________________________________ 10
Check for Proper Gate Installation _________________________________________________ 10
Column Installation Information___________________________________________________ 11
Items Included_________________________________________________________________ 11
Tools Needed _________________________________________________________________ 12
Items Not Included _____________________________________________________________ 12
GATE OPENER INSTALLATION ___________________________________________________ 13
Mounting Pull-to-Open Opener to Gate ____________________________________________ 13
Closed Position Stop Plate Installation ______________________________________________15
Mounting Push-to-Open Opener to Gate____________________________________________ 16
Closed Position Stop Plate Installation ______________________________________________18
CONTROL BOX INSTALLATION ___________________________________________________ 19
Control Box Installation _________________________________________________________ 19
Receiver Installation ____________________________________________________________20
Connecting the Battery __________________________________________________________ 21
Transformer Wiring Installation ___________________________________________________ 21
SOLAR PANEL INSTALLATION____________________________________________________ 23
CONTROL BOX SETTINGS _______________________________________________________ 25
DIP Switches__________________________________________________________________ 25
Setting Pull-to-Open (Closed) Gate Limit___________________________________________ 26
Resetting Closed Gate Limit______________________________________________________ 26
Setting Push-to-Open (Open) Gate Limit ___________________________________________ 27
Resetting Open Gate Limit _______________________________________________________ 27
Setting Obstruction Stall Force and Auto Close Time __________________________________ 28
Setting Your Personal Code ______________________________________________________ 28
CONNECTING ADDITIONAL DEVICES _____________________________________________ 30
Input Connections _______________________________________________________________31
Connecting Accessories _________________________________________________________ 32
Connecting GTO Automatic Lock _________________________________________________ 32
Connecting Other Auxilary Devices _________________________________________________32
MAINTENANCE & TROUBLESHOOTING ___________________________________________ 32
Maintenance Tips _______________________________________________________________32
Troubleshooting Guide ___________________________________________________________33

1MM660 Installation Instructions
Please Read This First!
Thank you for purchasing a Mighty Mule Gate
Operator—GTO's "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 Mighty Mule Gate Operator is designed for
installation on a pull-to-open single leaf gate (gates
that open into the property). By purchasing an
accessory bracket, the Mighty Mule Gate Operator can
accommodate a push-to-open single leaf gate (gates
that open out from the property). The gate must not
exceed 18 feet in length and weigh more than 350
pounds or exceed 8 feet in length and weigh more
than 850 pounds (please see Technical Specications
on page 9). 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.
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.
NOTE—If your application requires any of the
following:
• Swing gates longer than 18 feet or weighing
more than 850 pounds
• Slide gates
• Heavy duty or commercial uses
• Professional installation
Go to www.gtoaccess.com for a dealer or retailer near
you or call [phone] for information about our
Linear PRO Access professional line of gate operators
and accessories. Our Sales Department will be glad to
give you the name and phone number of a Linear PRO
Access dealer near you.
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.

MM660 Installation Instructions 2
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 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.
CAUTION
The gate will move freely and uncontrolled when the gate operator is removed from the gate. ONLY discon-
nect the operator when the control box power switch is OFF and the gate is NOT moving.
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).
Important Safety Information
Clevis Pin
Hairpin Clip
Gate Bracket
Front Mount
Bushing

3MM660 Installation Instructions
Gate in the
Open Position
ZONE 2
ZONE 3
ZONE 4
ZONE 5
Driveway
ZONE 1
Entrapment
Zones for a
Push-To-Open
Application
Gate in the
Open Position
ZONE 2
ZONE 3
ZONE 4
ZONE 5
Driveway
ZONE 1
Entrapment
Zones for a
Pull-To-Open
Application
Important Safety Information
For the Installer and End User
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 dam-
aged 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 page 10).
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 2).
4. The gate and operator installation must comply with any ap-
plicable 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 7).
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 installa-
tion. 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.
WARNING
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 sepa-
rate 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.
To reduce the risk of injury or death:

MM660 Installation Instructions 4
Moving Gate
Area
Driveway 10'
10'
10'
10'
NEVER install
any control device
within gray area
Moving Gate
Area
Driveway
10'
10'
10'
10'
NEVER install
any control device
within gray area
Pull-To-Open
Application
Push-To-Open
Application
II. During Installation
1. Install the gate operator on the inside of the prop-
erty 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 vehicle
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 3:
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

5MM660 Installation Instructions
For the Installer and End User
Important Safety Information
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 GTO 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 GATES PROPERLY MAINTAINED.
Always turn power to operator OFF before
performing any maintenance. See page 33 for
maintenance procedures.
7. To operate this equipment safely, YOU must
know how to disconnect the operator for manual
gate operation (see page 2). 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 GTO, at 3121 Hartseld Road,
Tallahassee, Florida 32303 or by calling 1-800-
543-4283 and requesting a duplicate copy. One
will be provided to you.

MM660 Installation Instructions 6
Vehicular Gate
Leading Edge
of the gate
Photo Beams
(recommended, not included)
Sensing Edges
(recommended, not included)
For the Installer and End User
Important Safety Information
Mighty Mule gate operators utilize Dual Sense Tech-
nology™ entrapment protection. Dual Sense Technol-
ogy™ 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 lead-
ing 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’s Dual Sense Technology™provides entrapment protection, even 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.

7MM660 Installation Instructions
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. The pedestrian access 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 GTO Bulldog Pedestrian Gate Lock (Call the GTO 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.
!
Warning Sign
Pedestrian Gate
Bulldog Pedestrian
Gate Lock
Vehicular Gate
(recommended, not included)
7 foot

MM660 Installation Instructions 8
Product identification label (1) installed on side of
control box.
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 separate entrance.
WARNING
!
MOVING GATE
Can Cause Injury or Death
1-800-543-GATE (4283) • www.mightymule.com
660®
Conforms to UL STD 325
Certified to CSA STD C22.2 No.247
Maximum Gate: 850 lb. (385.5 kg); 18 ft. (5.5 m)
Voltage: 12 Vdc; Frequency: 0 Hz; Power: 25 W
Class I Vehicular Swing Gate Operator.
MM600 SERIES DC Swing Gate Operator
P/N MM660
Serial Number: MM660-0000000
GTO Access Systems, LLC - Tallahassee, Florida USA
MMDDYY
9901178
Control Box label with Manual Open and
Close instructions
TO MANUALLY OPEN AND CLOSE THE GATE
1. Turn opener power switch OFF.
2. Disconnect front and rear mount from mounting brackets.
3. Remove opener from mounting brackets and move gate.
Disconnect opener ONLY when the power switch is OFF and
the gate is not moving.
www.mightymule.com
1-800-543-GATE (4283)
®
Important Safety Information
These warning labels should be found at the locations specied below. If any of them are missing,
immediately contact GTO for replacements.
Required Safety Precautions for Gates

9MM660 Installation Instructions
Technical Specifications
Mighty Mule 660 Gate Opener
Gate Weight
Gate Length
Number of Cycles* Per Day
Mighty Mule 660 Gate Capacity /Cycle Chart
Estimated number of daily cycles, based on use with a transformer and one(1) 12 Volt battery.
850 lbs.
750 lbs.
650 lbs.
550 lbs.
450 lbs.
350 lbs.
250 lbs.
150 lbs.
100 lbs.
50 lbs.
135
145
155
165
175
185
195
205
215
225
5’ - 6’
125
135
145
155
165
175
185
195
205
215
8’
125
135
145
155
165
175
185
195
205
10’
125
135
145
155
165
175
185
195
12’
125
135
145
155
165
175
185
14’
125
135
145
155
165
175
16’
NR
NR
NR
NR
NR
125
135
145
155
165
18’
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NOTE: “NR” indicates this size
and weight combination is not
recommended for the
Mighty Mule 660.
NOTE: Ball bearing hinges
should be used on all gates
weighing over 250 lb.
To determine the number of cycles the gate operator will perform using solar panels (see page 23).
* An operation cycle is one full opening and closing of the gate.
These specications are subject to change without notice.
DRIVE
• Low friction screw drive (linear actuator) rated for -5 ºF to
+160 ºF (-20 ºC to +71 ºC). Use of heater bands on arm and
control box will enhance performance in extreme cold tempera-
tures.
• Powered by a 12 V motor with integral case hardened steel
gear reducer. Motor speed reduced to 260 rpm. Generates 680
ft. lb. of torque at 12 V.
• Maximum opening arc of 110º. Approximate opening time
(90º): 20 seconds, depending on weight of gate.
POWER
• The system is powered by a 12 Vdc, 7.0 Ah, sealed,
rechargeable acid battery.
• Battery charge is maintained by a 120 Vac, 18 Vac output trans-
former. One lade-style control board fuse is rated for 15 A.
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.
• OPTIONAL: Battery charge is maintained by GTO Solar Panel
Charger Kit (5 Watt minimum).
CONTROL
• The Mighty Mule microprocessor-based control board is set for
single leaf, pull-to-open gate installations. DIP switches can be
adjusted to accommodate an optional kit for push-to-open gates
(see Accessory Catalog).
• A circuit on the control board regulates charging. “Sleep draw”
is 25 mA; “active draw” is 2 to 5 A.
• Auto-memorization of digital transmitter code.
• GTO remote-mounted RF receiver tuned to 318 MHz.
• Operator length with push-pull tube fully retracted is
40-1/4” mounting point to mounting point. Max stroke 20”.
• Adjustable auto-close timer (3 to 120 s), and Dual Sense Tech-
nology Stall Force.
• Power terminal block accommodates a transformer or solar
panels. NOTE: Do not use solar panel and transformer at
the same time.
• DIP switches simplify setup of gate operator.
• Accessory terminal block fully compatible with push
button controls, digital keypads, loops, etc.
• Control board allows connection of edge sensors and photo-
electric sensors.
• Audio entrapment alarm sounds if unit encounters an
obstruction twice while opening or closing.
OPERATIONAL CAPACITY
• The Gate Capacity Chart shows approximate cycles, per day,
you could achieve prior to the battery depleting to a state where
the unit will not function. This chart reects a Mighty Mule
Automatic Gate Opener when charging with a transformer.
Actual cycles may vary slightly depending upon the type and
condition of gate and installation.

MM660 Installation Instructions 10
Check Direction of Gate Swing
Before You Begin
Your Property Your Property
IMPORTANT: Check for Proper Gate Installation
E
A
B
C
D
F
Check Existing Gate Size and Material
• Gate size: Up to 18 feet or up to 850 lbs—See chart
on page 9.
• Type of gate material: Vinyl, aluminum, chain link,
farm tube, wrought iron, wood (not recommended for
solid surface gates).
Pull-to-Open Option
Instructions begin on
page 13
Push-to-Open Option
Instructions begin on
page 16
A - Level
B - Plumb
C - Free Swinging
For the Mighty Mule to work properly, gate must be plumb, level, set in concrete, swing freely and not touching
the ground and have good working hinges.
D - Secured Posts in Concrete
E - Centerline Mounting
F - Good Working Hinges (ball
bearing hinges are recommended
on gates over 250 pounds)
(Requires Push-To-Open Bracket
#FM148—NOT INCLUDED)

11 MM660 Installation Instructions
Before You Begin
3/8” x 1-1/2” Clevis Pin (2)
3/8” x 8” Bolt (4)
8” Nylon Cable Tie (14)
Receiver and
Control Box
Operator
Arm
Gate Bracket
Post Pivot Bracket Post Brackets
Transformer Warning
Sign
Closed Position
Stop Plate
Transmitters (2)
Installation
Video
3/8” x 2” Bolt (1)
5/16” x 1-3/4” Bolt (1)
3/8” Washer (9)
3/8” Lock Washer (7)
5/16” Washer (1)
3/8” Nut (7) 5/16” Nut (1)
Hairpin Clip (2)
2” Mounting Screw (5)
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
!
Installation Overview for the...
A
HIK
F
B
D
C
J
E
L M
Q
W
S
R
O
P
T
V
U
X Y Z
3/8” Bushing (2)
3/8” x 2-3/4” Bolt (2)
Items Included
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.
R4196 Kit Includes:
• Ground Rod Clamp
• 6 AWG Wire (3 feet)
NOTE: No grounding system absolutely protects against
lightning strikes. If installed correctly, a grounding system will
help minimize damage to your gate opener.
Metal Gate
Post
6 AWG Wire
8 Foot Ground Rod
5/8” Copper Clad Steel (not included)
- available at local homecenter and hardware stores -
Ground Rod
Clamp

MM660 Installation Instructions 12
x2
3/8” Bit
5/16” Bit
Drill
Pliers
Level
Clamp Adjustable
Wrench
Pen Center
Punch
Hammer
Tape
Measure
Small
Flat Head
Philips Head
Screwdriver
Flat Head
Screwdriver
Wire
Stripper
Hack Saw 1/2”
wrench
9/16”
wrench
• 12 Volt lawn tractor or automotive battery and a
weather proof case.
• Low voltage wire will be needed to run from the
transformer to the control box; length depends
upon the distance between the transformer power
supply and the control box. See Transformer Wiring
Installation on page 20, and the accessory catalog.
• PVC conduit.
• If your gate is more than 1000’ away from an ac
power source you will need to use at least one
Mighty Mule® 5 watt solar panel to trickle charge
the battery. See the accessory catalog (Do not use
both transformer and solar).
• If you have thin walled tube or panel gates, see
Recommended Reinforcement Examples after Step 3
of “Mounting Pull-to-Open Opener to Gate” section
(page 13).
• 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.
See Gate Bracket Mounting Examples after Step 3 of
“Mounting Pull-to-Open Opener to Gate” section.
• Surge protection for transformer.
• Some types of installations require u-bolts.
• If the gate is a push-to-open you will need to
purchase a PUSH-TO-OPEN bracket, refer to page
16 in Installation Manual for more information.
• Additional washers or a metal plate may be needed
for wooden post.
• Weatherproof cover for outdoor outlet and
transformer.
• Strain relief bushing for wiring accessory devices to
control box.
• If post the gate is hinged on is more than 6”, bolts
longer than 8” are needed.
Items Not Included
Before You Begin
Tools Needed

13 MM660 Installation Instructions
2" Min. - Pinch-Point Clearance
Top View
2" Min.
20" MAX.
2
1
Closed
Position
Open
Position
5
Mounting Pull-to-Open Opener to Gate
Gate Opener Installation
I
S
V
H
I
R
Y
1
X
X
F
M
MQ
B
Q
2
Attach opener to gate bracket and secure with required
hardware.
Assemble post bracket parts.
3
With Gate in OPEN position, using clamps, secure opener to
gate post and center cross member of gate.
Recommended reinforcement and gate bracket mounting
examples.
Steel Pipe Cut in Half
(not supplied)
Gate
Bracket
Thin Walled
Tube Gate
Gate
Bracket
1” x 6” Wood Reinforcement
Panel
Gate
Gate
Bracket
Wood or Metal
Reinforcement
(not supplied)
Mounting Plate
Created for
Decorative Gate
(required but not
supplied)
Remove excess bolt length
with hacksaw or bolt cutters
FRONT VIEW SIDE VIEW
Reinforcement and Gate Bracket Mounting
Remove clevis pin from the gate bracket and support loose
opener.
4
2
1
Your Property If you are installing a push-to-open gate opener - skip to page 16.
Swing gate and opener arm to the CLOSED position-check
clearance/binding by inspecting alignment. Arm stroke should
be maximum of 20”. TIP: Turning the pivot bracket over gives
more hole alignment options for the post pivot bracket assembly.

MM660 Installation Instructions 14
2
6
1
Mounting Pull-to-Open Opener to Gate
Gate Opener Installation
OPEN gate and reattach opener with clevis pin. Check for level.
Clamp securely.
U
O
Z
7
Secure post pivot bracket to post bracket when clearances are
OK (Step 5) in both open and closed positions.
9
8
Mark middle of post bracket slots on fence post. Mark middle of
gate bracket slots on gate cross support.
Remove clamps, post bracket, gate bracket, and opener. Then
use a hammer and center punch to dimple hole positions for
drilling.
P
S
Y
R
11
10
Drill 3/8” holes completely through gate post and gate cross
support.
Attach post bracket assembly to fence post. NOTE: Must be
through bolted.
Your Property

15 MM660 Installation Instructions
Mounting Pull-to-Open Opener to Gate
Gate Opener Installation
12
Y
S
T
R
1
1
2
2
13
Attach and secure opener assembly to brackets.Attach gate bracket assembly to gate cross support.
14
Check for level. Adjust post bracket if necessary. After the
opener is level, remove the opener from the gate.
Tighten all bolts and remove excess length on post and gate
bracket bolts with hacksaw.
15
Your Property
2
11
2
Fully open gate. Attach gate stop with one of the following:
• U-bolts—tube and chain link gates (Not included)
• Wood/lag screws—at aluminum/wood supports (Not included).
Closed Position Stop Plate Installation
J
1
Position gate stop with gate CLOSED to fence post. Tighten
fasteners. Cut off excess bolt length.
Return the gate to the full open position and reinstall the Mighty
Mule. To complete a pull-to-open installation, proceed to page 19.

MM660 Installation Instructions 16
2" minimum
pinch-point clearance
2
1
Maximum Stroke 20”
5
Top View
Closed
Position
Open
Position
Assemble post bracket parts. NOTE: A Push-to-Open Bracket
FM148 is required for this type of installation (not included).
I
I
R
V
S
Y
PTO
Bracket
FM148
11”
1
X
X
F
M
M
Q
B
Q
2
3
Mounting Push-to-Open Opener to Gate
Attach opener to gate bracket and secure with hardware re-
quired.
With gate in CLOSED position, using clamps, secure opener to
gate post and center cross member of gate.
Gate Opener Installation
Your Property
Recommended reinforcement and gate bracket mounting
examples.
Steel Pipe Cut in Half
(not supplied)
Gate
Bracket
Thin Walled
Tube Gate
Gate
Bracket
1” x 6” Wood Reinforcement
Panel
Gate
Gate
Bracket
Wood or Metal
Reinforcement
(not supplied)
Mounting Plate
Created for
Decorative Gate
(required but not
supplied)
Remove excess bolt length
with hacksaw or bolt cutters
FRONT VIEW SIDE VIEW
Reinforcement and Gate Bracket Mounting
2
4
1
Remove clevis pin from the gate bracket and support loose
opener.
If you are installed a pull-to-open gate opener - skip to page 19.
Swing gate to OPENED position. Check clearance/binding by inspecting
the alignment. The Maximum stroke is 20 inches. Secure post pivot bracket
to post bracket as shown in Step 7 on the next page, when clearance is OK
in both open and closed positions. TIP: Turning the pivot bracket over
gives more hole alignment options for the post pivot bracket assembly.

17 MM660 Installation Instructions
11
P
S
Y
R
CLOSE gate and re-attach opener with clevis pin. Check
for level. Clamp securely.
1
6
2
U
O
Z
7
Secure post pivot bracket to post bracket when clearance is OK
(Step 5) in both open and closed positions.
Mark middle of post bracket slots on fence post. Mark middle of
gate bracket slots on gate cross support.
10
9
Remove clamps, post, gate brackets, and opener. Then use a
hammer and center punch to dimple hole positions for drilling.
Drill holes completely through gate post and gate cross support. Attach post bracket assembly to fence post. NOTE: Must be
through bolted.
Mounting Push-to-Open Opener to Gate
Push-to-Open Installation
Your Property
8