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Mighty Mule Silver HD Dual Opener Kit - Upgrade from FM502 - for Heavy Duty Dual Swing Gate - up to 18 feet or 850 lbs.
Mighty Mule FM502 Opener Kit for Dual Swing Gates - up to 18 feet or 850 lbs - per leaf
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Mighty Mule Silver HD Dual Opener Kit - Upgrade from FM502 - for Heavy Duty Dual Swing Gate - up to 18 feet or 850 lbs.

Item Id: MM-Silver-HD-Dual
review 1 Review(s)
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Your Price: $799.00
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The Mighty Mule Silver HD Dual - Upgrade Kit from Mighty Mule FM502 Single Gate Opener America's #1 Do-It-Yourself Gate Opener, has NEW commercial features rarely found in a do-it-yourself gate opening kit. This heavy duty, commercial grade unit that is very easy to install. It has upgraded commercial features such as "soft start "and "soft stop" that will extend the life of your gate hardware and gate opener.


Upgrade Kit Includes:

  • Operator arms(2)
  • 6 ft. and 40 ft. power cables
  • Control box
  • (2) Entry transmitters
  • 12 Volt transformer
  • (2) Batteries
  • (2) Pin locks
  • Receiver with 10 ft. cable
  • Mounting brackets/installation hardware
  • Bracket hardware
  • Instruction manual
  • Installation video
  • Extended warranty form
  • Customer support card
  • Warning signs (four)


The Mighty Mule Silver-HD Dual  can handle gates up to 850 lbs (~385 kg) or 18 ft (~5.5m) per leaf. The Silver Series Kits is an upgraded kit from the Mighty Mule FM502 and comes ready to install with extra accessories normally not included in operator purchases.

The Silver Anniversary Series Operator Kits are available exclusively for Professional GTO / Mighty Mule Distributors / Dealers. The New boxed kit includes extra items you would normally have to pay additional charges for. GTO offers these kits as an alternative to their top-of-the-line GTO/PRO Operators for budget-minded consumers that want value at a discounted price.


  • Designed for gates up to 18 ft long or 850 lbs per leaf
  • Large control box with room for extra battery and accessories
  • AC or Solar powered to meet the needs of 100% of the market
  • Professional GRADE Soft Start / Soft Stop feature increases life of hardware and opener
  • Designed for gates that open into or out from the property.
  • 12-volt battery backup (included) opens and closes the gate even during power outage.
  • 18 month Limited Warranty

• 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 temperatures.
• 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.

• 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 transformer rectified to 14.5 Vdc (40 VA) through the GTO control board. 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.
• OPTIONAL: Battery charge is maintained by GTO Solar Panel Charger: float voltage of 14.5 Vdc output from a 10-7/8†x 10-1/2†solar panel. Generates minimum of 5 W at 300 mA. A gated diode on the control board prevents battery discharge.

• GTO 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).
• 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.
• Operator length with push-pull tube fully retracted is 40-1/4†mounting point to mounting point. Max stroke 22†.
• Adjustable auto-close timer (15 to 120 s), and obstruction sensitivity.
• 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, safety loops, etc.
• 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

Customer Reviews
Rating Human
Overall this is a very good kit. My only issues, even though they are not a big deal, is that the lengths of the wires on the actuators are too short. If you can use this unit on 2 18' gates the 40 foot cords only leave you 4 feet of extra wire making the box location very limited. the 6 foot length is also way to short. For my application 2 10' gates it worked but I wanted to locate the control box farther away and could not due to the short 6 foot cord on the actuator. The closed position stop plates should be drilled to accept a 2" muffler clamp. This would work for all those using standard pipe gate. The transformer should be able to be remote located. When you plug in the recommended surge protector and the transformer it is impossible to fit those under the electrical box cover, even the "in use" covers. Just little technical things that would be a great improvement. Over all I am very happy with the unit.
Reviewed by: from NY. on 5/21/2016
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