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Mighty Mule UL325 SERIES - User Manual

Mighty Mule UL325 SERIES
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WARNING
!
MOVING GATE
Can Cause Injury or Death
502
®
E-Z GATE OPENER
1-800-543-GATE (4283) • www.mightymule.com
WARNING
!
MOVING GATE
Can Cause Injury or Death
502
®
E-Z GATE OPENER
1-800-543-GATE (4283) • www.mightymule.com
UL325 SERIES
502
®
E-Z GATE OPENER
DUAL GATE SYSTEM
©
2007 GTO, Inc.
Installation Manual for the
WARNING!
This equipment is similar to other gate or door equipment and meets or exceeds
Underwriters Laboratory Standard 325 (UL 325). However, gate equipment has
hazards associated with its use and therefore by installing this product the installer
and user accept full responsibility for following and noting the installation and
safety instructions. Failure to follow installation and safety instructions can result
in hazards developing due to improper assembly. You agree to properly install this
product and that if you fail to do so GTO, Inc. shall in no event be liable for direct,
indirect, incidental, special or consequential damages or loss of profits whether
based in contract tort or any other legal theory during the course of the warranty
or at any time thereafter. The installer and/or user agree to assume responsibility
for all liability and use of this product releasing GTO, Inc. from any and all
liability. If you are not in agreement with this disclaimer or do not feel capable
of properly following all installation and safety instructions you may return this
product for full replacement value.
READ ALL INSTRUCTIONS CAREFULLY AND COMPLETELY before
attempting to install and use this automatic gate opener. This gate opener
produces a high level of force. Stay clear of the unit while it is operating and
exercise caution at all times.
All automatic gate openers are intended for use on vehicular gates only.
This product meets and exceeds the requirements of UL 325, the standard which regulates gate opener safety,
as established and made effective March 1, 2000, by Underwriters Laboratories Inc.
R502INST
rev - 09/24/07
Printed in China for GTO, Inc.
L
I
S
T
E
D
US
For more information on GTO/PRO’s full line of automatic gate openers and access controls visit our website at www.gtopro.com

Table of Contents

Questions and Answers

  • S
    Samantha GoodAug 12, 2025
    Why does my Mighty Mule Gate Opener beep once with 10 seconds off?
    • T
      Thomas CarrAug 12, 2025
      The Mighty Mule Gate Opener beeps once with 10 seconds off due to a low battery condition. To resolve this, check the fuses, battery harness connections, and the battery under load.
  • S
    Stephen AndersonAug 15, 2025
    What does it mean when my Mighty Mule UL325 beeps once then three times?
    • D
      Desiree JohnsonAug 16, 2025
      If your Mighty Mule Gate Opener beeps once, then three times, it indicates that the slave motor terminals are shorted. Check the connections to the master inputs, slave arm power cable, motor, and circuit board.
  • M
    mendezmelissaAug 19, 2025
    What to do if Mighty Mule Gate Opener beeps once with 2 seconds off?
    • X
      Xavier JenningsAug 20, 2025
      If your Mighty Mule Gate Opener beeps once with 2 seconds off, it indicates a master arm limit switch error. Check the connections to the master inputs, master arm power cable, master input ORG & GRN, BRN & GRN voltage with wires disconnected. Ensure there's 11VDC across each terminal.
  • W
    William BeckerAug 25, 2025
    What to do if Mighty Mule Gate Opener beeps twice with 2 seconds off?
    • J
      Jennifer OchoaAug 25, 2025
      If your Mighty Mule Gate Opener beeps twice with 2 seconds off, it indicates a slave arm limit switch error. Check the connections to the slave inputs, slave arm power cable, slave input ORG & GRN, BRN & GRN voltage with wires disconnected. Ensure there's 11VDC across each terminal.
  • J
    jonathannguyenAug 27, 2025
    What to do if Mighty Mule UL325 gives 1 short beep upon activation?
    • G
      Gregory WallaceAug 27, 2025
      If your Mighty Mule Gate Opener gives one short beep upon activation, it indicates a blown fuse, low or bad battery, or a loose battery connection. Check the fuse, test the battery under load, and inspect the battery harness connections.
  • R
    Ryan ChangAug 30, 2025
    What does it mean when my Mighty Mule UL325 Gate Opener beeps once then twice?
    • J
      James StephensonAug 30, 2025
      If your Mighty Mule Gate Opener beeps once, then twice, it means the master motor terminals are shorted. You should check the connections to the master inputs, master arm power cable, motor, and circuit board.
  • M
    Matthew MirandaSep 4, 2025
    What does it mean when my Mighty Mule UL325 beeps 3 times with 2 seconds off?
    • E
      esteeleSep 4, 2025
      If your Mighty Mule Gate Opener beeps three times with 2 seconds off, it means there is a master arm rev counter error. Check the connections to the master inputs, master arm power cable, and rev counter.
  • D
    Dawn HallSep 7, 2025
    What does it mean when my Mighty Mule UL325 beeps 4 times with 2 seconds off?
    • B
      barnettjessicaSep 8, 2025
      If your Mighty Mule Gate Opener beeps four times with 2 seconds off, it means there is a slave arm rev counter error. Check the connections to the master inputs, master arm power cable, and rev counter.

Mighty Mule UL325 SERIES Specifications

General IconGeneral
Power Supply12V DC
Maximum Gate Length16 ft
TypeSwing Gate Opener
Gate TypeSingle or Double Swing Gate
UL325 CompliantYes
Motor TypeDC Motor
Warranty12 month limited warranty
Safety FeaturesObstacle detection, Auto-reverse

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