Mighty Mule FM352 User Manual

Installation Manual for the

UL325 SERIES

352

®

E-Z GATE OPENER

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 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 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.

For more information on Mighty Mule’s full line of Automatic Gate Openers and Access Controls visit our website at www.mightymule.com

GTO Sales: (800) 543-GATE (4283) or [phone] • Fax [phone] or

For 24 hr/day, 7 day/week Technical Service visit http://support.gtoinc.com/support/troubleshooter.aspx

GTO Technical Service [phone] or [phone]

©

2008 Gates That Open, LLC

rev - 02/25/10

R352INST

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.

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.

Conversion Chart

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

FOR YOUR RECORDS

Please record the product serial number (located on the rear of opener arm),
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.

Table of Contents

Gate Opener Class Categories ------------------------------------------------------------ inside cover
Units and Standards Conversion Chart ------------------------------------------------ inside cover

PLEASE READ THIS FIRST! ------------------------------------------------- page iii

KEEP THESE INSTRUCTIONS FOR FUTURE REFERENCE

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 5
Required Safety Precautions for Gates -------------------------------------------- page 6
Warning Signs and Labels ------------------------------------------------------------- page 7

Installation ------------------------------------------------------------------------ page 8

Parts List ------------------------------------------------------------------------------------- page 8
Tools and Items Needed for Installation ------------------------------------------- page 9
Technical Specifications ------------------------------------------------------------- page 10

Installation Overview -------------------------------------------------------------------- page 11

Installation of the Mounting Hardware --------------------------------------------- page 12
Mounting the Master Opener --------------------------------------------------------- page 16

Mounting the Second Opener -------------------------------------------------------- page 16
Installation of the Closed Position Stops ----------------------------------------- page 16
Trench and Lay Conduit for Wiring ------------------------------------------------- page 19

Preparing To Connect The Wires ------------------------------------------ page 19

Attaching Master Battery and Communication Cables ---------------------- page 20
Attaching Second Battery and Communication Cables -------------------- page 21
Powering Options: Transformer or Solar ------------------------------------------ page 22
Connecting the Battery ----------------------------------------------------------------- page 23
Connecting the Transformer ---------------------------------------------------------- page 24
Connecting Solar Panel(s) ------------------------------------------------------------- page 26

Master Control Board Settings -------------------------------------------- page 26

DIP Switches ------------------------------------------------------------------------------- page 26
Dual Mode DIP Switches --------------------------------------------------------------- page 26
Stall Force and Auto-Close ------------------------------------------------------------ page 27

Installing the Receiver ----------------------------------------------------------------- page 28
Setting the Closed Position Limit ---------------------------------------------------- page 29

Setting Your Personal Transmitter Code ------------------------------- page 30

Connecting Additional Safety Devices --------------------------------- page 31

Control Board Connections ------------------------------------------------ page 32

Connecting Accessories ----------------------------------------------------- page 33

Routing Wires Through the Access Panel ----------------------------- page 34

Final Step ------------------------------------------------------------------------- page 35

Push to Open Installation ---------------------------------------------------- page 36

Setting the Open Position Limit -------------------------------------------- page 37

Visual and Audible Diagnostic Indicators ----------------------------- page 39

Repair Service ------------------------------------------------------------------ page 41

Column Installation Information ------------------------------------------ page 42

Accessory Catalog ------------------------------------------------------------ page 43

PLEASE READ THIS FIRST!

®

E-Z GATE OPENERS

Thank you for purchasing a Mighty Mule® 352 E-Z Gate Opener—GTO's "do-it-yourself" automatic gate
opener! When correctly installed and properly used, your Mighty Mule® 352 E-Z Gate Opener will give
you many years of reliable service. Please read the following information and watch the enclosed video to
ensure you have the correct system for your particular needs. Furthermore, this manual and the video will
enable you to properly install your Mighty Mule® 352 E-Z Gate Opener.

The Mighty Mule® 352 E-Z Gate Opener is designed for installation on a pull-to-open dual gate leafs
(gates that open into the property). By purchasing an accessory bracket (FM148), the Mighty Mule®
352 E-Z Gate Opener can accommodate a push-to-open dual gate leafs (gates that open out from the
property). The gates must not exceed 8 feet and 550 pounds or exceed 16 feet and 150 pounds (please
see Technical Specifications on page 10). The Mighty Mule® 352 EZ Gate Opener can be used on vinyl,
aluminum, chain link, farm tube, and wrought iron gates.

Use on solid (surface) gates is not recommended. Solid surface gates have a
high resistance to the wind. If the wind is strong enough, the opener will obstruct
and stop, blow fuses, or may damage the equipment.

The Mighty Mule® 352 E-Z 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 (800-543-GATE).

The Mighty Mule® 352 E-Z Gate Opener features adjustable obstruction sensing. This safety feature
makes the gate stop and reverse direction within 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® 352 E-Z Gate Opener 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.

PLEASE NOTE—If your application requires any of the following:

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.

BEFORE YOU BEGIN TO INSTALL YOUR AUTOMATIC GATE OPENER:

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 opener safety and proper use of the gate opener.

iii

IMPORTANT SAFETY INSTRUCTIONS

Clevis Pin

Hairpin Clip

Gate Bracket

Front Mount

Bushing

Because automatic gate openers produce high levels of force, consumers need to know the potential
hazards associated with improperly designed, installed, and maintained automated 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.

To Manually Open and Close the

Gate, Follow the Procedure Below:

CAUTION: The gate will move freely and uncontrolled when the gate
opener is removed from the gate. ONLY disconnect the opener when the
opener power switch is OFF and the gate is NOT moving.

Disconnecting the Opener

1. Turn opener power switch OFF.

2. Remove hairpin clip, clevis pin, and

bushing from the front mounting point.

3. Remove the opener from the mount.

The gate can be opened and closed manually
when the opener is disconnected.

IMPORTANT:

front mount - it will break from the arm weight.

CAUTION: Because the Mighty Mule gate

opener is battery powered, disconnect the opener
ONLY when the power switch on the opener is
turned OFF. Unplugging the transformer does not
turn power to the opener OFF.

NEVER allow opener arm to hang by the

NOTE: Substitute a Pin Lock (FM133) for the clevis pin

on the front mount only of the gate opener to prevent
unauthorized removal of the opener from the gate

(see Accessory Catalog).

Mighty Mule 352

1

IMPORTANT SAFETY INSTRUCTIONS

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

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.

Entrapment Zones for a
Pull-To-Open Application

2

Mighty Mule 352

IMPORTANT SAFETY INSTRUCTIONS

Moving Gate

Area

Moving Gate

Area

Driveway

10'10'

10'10'

10'10'

NEVER INSTALL

any control device

within gray area

Entrapment Zones for a proper Pull-To-Open installation:
Zone 1 – leading edge of the master and second gate.
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.

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 contact sensors (safety edges) and non contact sensors (photo beams) provide
additional protection against entrapment.

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.

Pull-To-Open
Application

Mighty Mule 352

3

IMPORTANT SAFETY INSTRUCTIONS

III. After Installation

1. Attach the warning signs (included) to each side of the gate to alert the public of auto matic 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 an activated 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 performing any
maintenance. Clean the push-pull tube with a soft, dry cloth and apply silicone spray to it at least once
per month. Grease hinges, spray push pull tube with high quality silicone spray.

7. 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.

8. Disconnect the opener ONLY when the power is TURNED OFF and the gate is NOT moving.

9. Make arrangements with local fire and law enforcement for emergency access.

10. Distribute and discuss copies of the IMPORTANT SAFETY INSTRUCTIONS 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 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.

Additional copies of this manual 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.

4

Mighty Mule 352

IMPORTANT SAFETY INSTRUCTIONS

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

Secondary Means of Protection Against
Entrapment

As specified by Gate Opener Safety Standard, UL 325 (30A.1.1), automatic gate openers shall have
an inherent entrapment sensing system, and shall have provisions for, or be supplied with, at least one
independent secondary means to protect against entrapment. The Mighty Mule® 352 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.

1. For gate openers 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® 352 Gate Opener is designed to stop and reverse within 2 seconds when the
gate comes in contact with an obstruction. 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 from a hardwired
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.

Mighty Mule 352

5

IMPORTANT SAFETY INSTRUCTIONS

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

)

Required Safety Precautions for Gates

Install Warning Signs

Warning signs alert people of automatic gate operation and are required when installing the Mighty Mule®
352 E-Z 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.

Entrapment Protection

GTO’s 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 enhanced protection against entrapment.

Warning Signs

The warning signs (at right) must
be installed on both sides of the
gate (see page 7 for details).

6

Mighty Mule 352

!

Warning signs (4 enclosed) to be installed on each side
of the gate (3–5 feet above the bottom of the gate).

This label is located

under rear mount on the opener.

Logo and warning labels (2) installed on each side of
opener housing.

1-800-543-GATE (4283) • www.mightymule.com

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.

Can Cause Injury or Death

MOVING
GATE!

®

E-Z GATE OPENER

UL325 SERIES

®

352

! !

TO MANUALLY OPEN AND CLOSE THE GATE

1. Turn opener power switch OFF.

2. Disconnect front or rear mount from
mounting bracket.

3. Pull opener away from mounting bracket
and move gate.

Disconnect opener ONLY when the power
switch is OFF and the gate is not moving.

Maximum Gate: 550 lbs. (249.4 kg); 16 ft. (4.9 m) • Voltage: 12 Vdc; Frequency: 0Hz; Power: 25W • Class I, II, and III Vehicular Swing Gate Operator

GTO DC SWING Series
Conforms to UL325
5th Edition Standards

Serial No. MM350DUAL-0000000

05/14/08

Gates Thats Open, LLC - Tallahassee, Florida USA

Product identification label

IMPORTANT SAFETY INSTRUCTIONS

These warning labels should be
found at the locations specified
below. If any of them are
missing, immediately contact
GTO for replacements.

Mighty Mule 352

7

Parts List - Opener and Mounting Hardware

Hairpin Clip (4)

3/8" x 1-1/2" Clevis Pin (4)

5/16" x 1-3/4" Bolt (2)

3/8" x 2" Bolt (2)

3/8" x 3" Bolt (4)

3/8" x 8" Bolt (8)

8" Nylon Cable Tie (14)

3/8" Washer (18)

3/8" Lock Washer (14)

5/16" Washer (2)

3/8" Nut (14)

5/16" Nut (2)

Hardware Bag Contents

Second Opener (1)

Master Opener (1)

Post Pivot Bracket (2)

3/8" Bushings (4)

32’ Communication
Cable (1)

Gate Bracket (2)

Post Bracket (4)

Closed Position
Stop Plate (1)

2" Mounting Screw (5)

Installation Video (1)

Customer Support Card (1)

Transformer (1)

Warning Signs (4)

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

!

Receiver (1)

10’ Master
Battery
Harness (1)

GTO Transmitter (1)

32’ Second Opener
Battery Harness (1)

10’ Master
Battery Harness (1)

8

Mighty Mule 352

Tools Needed

• Center Punch

• Open End Wrenches — 3/8", 7/16", 1/2", and 9/16"

• Small (Flat Bladed) Screwdriver

• Tape Measure

• Level

• Wire Strippers

• Phillips Screwdriver/ Large

• C-Clamps — small, medium, and large

• Power Drill

• 3/8" Drill Bit

• Hacksaw or Heavy Duty Bolt Cutters

• Extra person will be helpful

YOU MAY ALSO NEED THESE ITEMS BEFORE YOU BEGIN THE INSTALLATION
(Some of these items can be found in the Accessory Catalog page 42):

• 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 opener arm. See
Powering Options: Transformer or Solar on page 22, and the Accessory Catalog.

• If your gate is more than 1000' away from AC power source you will need to use at least one

Mighty Mule® 10 watt Solar Panel (FM123) to charge the 12 Volt automotive or marine type battery
(not included). See the Accessory Catalog.

• If your fence post is made of wood and is less than 6" in diameter or 6" square, see page 12.

• Metal plate or washer between nuts and fence posts to prevent pulling bolts out of wood.

• If your fence post is larger than 6" in diameter you will need threaded rods or carriage bolts longer

than 8". See page 15.

• Low prole ground stop page 17.

• PVC conduit.

• If you have thin walled tube or panel gates, see Recommended Reinforcement Examples on page 12.

• 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 page 11, step 2; page 15, step 10.

• Surge protection for transformer.

• Some types of installations require U-Bolts.

• Spade terminal for transformer page 25, step 4.

Mighty Mule 352

9

Technical Specifications

Gate Weight

Gate Length

Number of Cycles Per Day

Mighty Mule 352 Gate Capacity /Cycle Chart

Estimated number of daily cycles, based on use with a transformer and one(1) 12 Volt battery.

550 lbs.
450 lbs.
350 lbs.
250 lbs.
150 lbs.
100 lbs.

50 lbs.

62
67
72
77
82
87
92

5’ - 6’

57
62
67
72
77
82
87

8’

57
62
67
72
77
82

10’

57
62
67
72
77

12’

57
62
67
72

14’

57
62
67

16’

NR
NR
NR
NR

NR
NR
NR

NR
NR

NR

MIGHTY MULE® 352 E-Z GATE OPENER

DRIVE

• Low friction screw drive (linear actuator) rated for -5 ºF to +160 ºF (-21 ºC to +71 ºC).

• 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 110º. Approximate opening time (90º): 18 seconds, depending on weight of gate.

POWER

• The system is powered by a 12 Vdc automotive or marine battery.

• Battery charge is maintained by a 120 Vac, 18 Vac output transformer [rectied to 14.5 Vdc (40 VA) through

the GTO control board] or by optional GTO Solar Panels [the panel should generate minimum of 10 W at
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 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.

CONTROL

• GTO microprocessor-based control board is set for dual leaf, pull-to-open gate installations. DIP switches can

be adjusted to accommodate an optional kit for push-to-open gates (see Accessory Catalog).

• Control board has temperature compensated circuits.

• 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.

• Opener length with push-pull tube fully retracted is 37

• Adjustable auto-close timer (OFF to 120 s), and obstruction sensitivity.

• Power terminal bock accommodates a transformer or solar panels.

• DIP switches simplify setup of gate opener.

• Accessory terminal block fully compatible with all Mighty Mule access controls.

• Control board allows connection of safety edge sensors and photoelectric sensors.

• Audio entrapment alarm sounds if unit encounters an obstruction twice while opening or closing.

1

/

4", mounting point to mounting point. Max stroke 19".

OPERATIONAL CAPACITY

• The Gate Capacity Chart shows approximate cycles, per day, you can expect from the Mighty Mule 352 Au-

tomatic Gate Opener when powered with a transformer. Actual cycles may vary slightly depending upon the

type and condition of gate and installation.

NOTE: BALL BEARING HINGES SHOULD BE USED ON ALL GATES WEIGHING OVER 250 LB.
To determine the number of cycles the gate opener will perform using solar panels, please see the specifications

listed on page 22 or call [phone] or [phone] for more information.

* An operation cycle is one full opening and closing of the gate.

10

NOTE: "NR" indicates
this size and weight
combination is not
recommended for the
Mighty Mule 352.

* These specifications are subject
to change without notice.

Mighty Mule 352

32 foot power cable connects
SLAVE to 12 Volt marine or
automotive type battery. (run in
PVC conduit)

32 foot communication cable
allows the MASTER and SECOND
gate openers to operate as an
integrated dual gate system. (run
in PVC conduit)

You will need to trench across the
driveway in order to lay conduit
for the second battery harness
and communication cable.

120 Volt indoor

Transformer

(surge protector

not supplied)

Fence Post
Set in Concrete

Run 1000' (max.) of low
voltage wire to battery
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

Receiver

Gate Bracket

Master Opener

10'

Battery Harness

Second Opener

Closed Position Positive Stop Plates

Installation Overview

Horizontal Cross Member

Vertical Cross Member

Pull-to-Open Gates (Gate Opens into the Property)

The diagram shown below is an example of a pull-to-open installation on a chain link fence and dual
gate. Mounting the openers on masonry columns requires special procedures; see Column Installation
Information on page 42 if you intend to mount the openers on columns. Furthermore, if you have push-
to-open gates, you will need to purchase 2 push-to-open brackets (FM148) (see Accessory Catalog) to
properly configure your system. See push-to-open installation on page 36 before proceeding.

Preparation of the Gate

Step 1

The gate must be plumb, level, and swing freely
on its hinges. Wheels must not be attached to
the gate. The gate must move throughout its arc

without binding or dragging on the ground.

Note that gates over 250 lb. should have ball
bearing hinges with grease fittings.

Step 2

The fence post must be secured in the ground
with concrete so it will minimize twist or flex
when the opener is activated. We recommend
you position the opener near the centerline
of the gate to keep the gate from twisting and
flexing and to avoid backsplash from rainwater.
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.

Mighty Mule 352

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