How to install a swing gate opener

Installing a swing gate opener is mostly careful measuring. The motor work is easy; the arm geometry, the pad and the safety setup are where installs go wrong. This guide follows a pad-mounted, articulated-arm operator, the type Eagle sells, using the dimensions and settings in Eagle’s Eagle-II installation manual. Other models have their own numbers, so keep your own manual open.

What you need

• The right opener. Rated for the leaf’s length and weight; check with our guide to weighing a gate.
• A gate that swings freely on solid posts and hinges, opening into the property. For outward swings, read push vs pull gate openers.
• Concrete for the pad, and sleeve anchors (not supplied with the Eagle-II).
• Welding for the gate attachment bracket on Eagle swing operators.
• An electrician for the 120 V supply.
• Safety devices: photo eyes, edges where needed, and warning signs.

Step by step

1. 1

   Step 1: Check the gate

   Make sure the gate swings freely in both directions on solid posts and hinges. Don't plan to make up for a sticky gate by turning up the opener's force.

2. 2

   Step 2: Plan position and power

   Pick the operator spot inside the property next to the hinge post. Have an electrician plan the 120 V circuit, and run low-voltage wiring in its own conduit.

3. 3

   Step 3: Pour the concrete pad

   Pour a level pad at the size and height the manual gives. Eagle's swing manual suggests 20 by 20 in, about 5 in above ground and 20 in deep, with depth set by local code.

4. 4

   Step 4: Bolt down the operator

   Anchor the operator to the cured pad with the anchors the manual specifies. For the Eagle-II that's four 1/2 in sleeve anchors, 3 1/2 in to 6 in long.

5. 5

   Step 5: Fit and level the arm

   Measure the arm positions from the manual's table, keep the arms level, and check they are fully extended and locked with the gate closed. Then fix the gate bracket.

6. 6

   Step 6: Connect power

   Have the electrician connect and ground the 120 V supply. Eagle recommends surge protection.

7. 7

   Step 7: Set direction and limits

   Set the opening direction on the board, then set the close limit first with the gate closed, and the open limit with it open.

8. 8

   Step 8: Adjust clutch and reversing force

   Set the clutch and the reversing sensor so the gate stops and reverses when it meets an obstruction. Eagle's manual says this should be done by a qualified technician.

9. 9

   Step 9: Add sensors, controls and signs

   Install photo eyes and edges where the gate can trap someone, mount controls well away from the gate, and put warning signs on both sides.

10. 10

    Step 10: Test

    Run the gate several times. Check that it reverses on contact with a rigid object and stops when a photo eye is blocked. Repeat the test monthly.

The pad

Eagle’s swing manual recommends a 20 by 20 in pad, about 5 in above ground, and suggests 20 in of depth, while telling you to check local code for depth. The operator bolts down with four 1/2 in sleeve anchors, at least 3 1/2 in long and up to 6 in. Plan conduit stubs through the pad before you pour, with high- and low-voltage wiring in separate conduits.

The arm: where most installs go wrong

The arm’s job is to push the gate open and pull it shut without binding. Eagle’s manual gives the operator position for several arm layouts. For the Eagle-II’s standard installation, in inches:

Layout	A	B	C	D	E
Standard, option 1	11	24	20	25	27
Option 2	11	26	21	26	29
Option 3	11	28	23	27	30
Option 4	11	30	24	28	31
Compact	F 29	G 21.5	H 11	I 23.5	J 24

The letters are distances on the manual’s drawing, from the hinge center to the operator and along the arm. Eagle says these can vary with the operator position, and that some testing of arm lengths is needed before the final install. Its rules:

• Use the compact layout when the space for the arm is limited and the dimension marked on the manual’s drawing is under 35 in.
• If the gap between the open gate and the wall is under 16 in, extra entrapment protection is required in that area.
• Keep the arms level.
• With the gate closed, the arms must be fully extended and locked. Eagle warns that failing to do this could result in serious injury.
• With the gate open, the arms must not scissor. That stresses the arm and the operator.
• Weld the gate attachment bracket all the way around, but only after the arm measurements are confirmed.

Limits, clutch and reversing force

• Direction. Set the board’s open-left or open-right switch first.
• Limits. With power on, set the close limit first with the gate closed, then the open limit. Don’t run the operator before the limits are set.
• Clutch. Eagle says some clutch slippage is normal, about a quarter turn depending on gate weight; adjust it if it doesn’t slip at all.
• Reversing sensor. The board has separate sensitivity settings for opening and closing. Eagle’s manual says to set them so the gate stops and reverses against about 20 lb of force, that heavier gates need less sensitivity, and that only a qualified service technician should make these adjustments.

The manual’s UL 325 instructions also say never to over-tighten the clutch to make up for a damaged gate. If the gate needs force to move, fix the gate.

Double gates: master and slave

1. Install and set up each operator on its own first: direction, limits, reversing sensor and switches.
2. Connect the two boards with 20 gauge stranded wire, positive to positive and negative to negative. Eagle says polarity matters.
3. Set one board as master and the other as slave.
4. Put both operators on the same circuit breaker.
5. Use the close timer on the master only.
6. Set the open/close delay so the leaves don’t clash where they meet.

Sensors, controls and signs

• Photo eyes across the opening, and a reflective photo eye for the opening direction, mounted just above operator height, as Eagle’s manual recommends.
• Edges on the inside and outside leading edge of the leaf, and on the bottom edge if it’s more than 6 in above the ground anywhere in its swing (UL 325 instructions).
• Controls at least 6 ft from any moving part under UL 325, or 10 ft as Eagle’s swing manual asks.
• Warning signs on both sides of the gate.

Eagle’s Eagle-II manual is dated 2013, before the UL 325 changes of January 2016. Since then, photo eyes and edges used for protection must be monitored by the operator. Our UL 325 guide explains the current rules.

Checklist

• Gate swings freely; hinges and posts are solid
• Pad level, cured, conduits in place
• Operator anchored and level
• Arms level, locked straight when closed, not scissored when open
• Gate bracket welded after measurements confirmed
• Power connected and grounded by an electrician; surge protection fitted
• Limits set, close first
• Reversing force set and tested
• Photo eyes, edges, controls and signs in place
• Reverse test passed

Common mistakes

• Welding the bracket before testing the arm geometry.
• Arms not locked straight when closed, which lets the gate be pushed open or loads the gearbox.
• Too much force to get a binding gate to move.
• Running the operator before setting limits.
• Keypad within reach of the moving gate.
• Using the 2013 manual’s sensor rules without checking today’s UL 325 monitoring requirement.

Openers and tools

• More detail in the best swing gate openers.
• Plan the circuit with our gate opener wiring guide and the wire size calculator.
• Not sure about doing it yourself? Read DIY vs professional installation.