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Chamberlain GA400D, GA420D 4Remove Motor Assembly, 5Determine Maximum Piston Travel

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4Remove Motor Assembly

Remove screws (4) and remove motor assembly. Set motor aside and place in clean, dry location.

NOTE: Turn operator over to remove screws.

Screws

Motor

	GAT	E
	GAT	IDE
	STO	IDE
	THIS

5Determine Maximum Piston Travel

To ensure proper operation, it is essential to keep the piston from extending and retracting completely.

“Slowly extend the piston 1/4" (.64 cm) from collar and draw a mark.”

“Manually extend piston out as far as possible, push back 1/4" (.64 cm) and then mark.”

Piston

“Always stay within these two marks to prevent the piston from bottoming

3 out which could damage the transmission.”

Installation

Contents

■Please read this manual and the enclosed safety materials carefully ■Periodic checks of the operator are required to ensure safe operation ■The model number label is located inside the control box of your operator ■Serial # ■Installation Date 2-7INTRODUCTION 8-12PREPARATION AND OVERVIEW 13-22INSTALLATION 23-31WIRING 32-35PROGRAMMING Operator Specifications Main Supply (Motor) Accessory Power NOTE: Power Consumption Safety Installation Information Page Carton Inventory pulls-to-open pushed open Hardware Inventory All Models: GA420D Only: SAFETY SENSORS HARDWARE CONDUIT PREPARATION AND OVERVIEW Left-HandGate Right-HandGate Inside Gate Dual Gate Overview Check Your Gate Pull-to-Open Push-to-Open Left-HandHinge Mounted Right-HandHinge Mounted INSTALLATION Identify Hinge Type 2 Measuring and Marking for the Gate Bracket Template Method Tape Measure Method Position the Extension Bracket to Post Bracket 4Remove Motor Assembly 5Determine Maximum Piston Travel 6 Attach Brackets to Gate Operator 7Position Gate Bracket 8 Check Piston Travel 9 Secure Gate Bracket to Gate Secure Post Bracket to Gate Post 11Reattach Motor Assembly Attach Operator to Gate and Bracket For Model GA420D Only Warning Sign Placement Open the Control Box Remove the Control Board Select Mounting Holes Mount the Control Box Install the Control Board WIRING 1Watertight Connector Nut 2 Insert Operator Cable 3 Connect Operator to Control Board Connect Gate Operator (Gate 2) to Control Box (Model GA420D Only) Set the Lock/Bipart Delay LOCK/BIPART DELAY Outside Property 1Connect second Operator to Control Board (Model Ga420D Only) 2 Junction Box 3 Connect Watertight Connectors Connect Wires in Junction Box 5 Secure Junction Box Connect Indoor Transformer to Low Voltage Wire and Battery 1 Connect indoor Transformer to Control Board AC PWR/SOLAR DIAGNOSTIC STOP 2 Connect Batteries PROGRAMMING Single Arm Left-HandSide Program Open Program Close Dual Gate (Right-SidePrimary Operator) Force Adjustment Party Mode Timer-to-Close(TTC) To Add or Reprogram a Remote Control (not provided) LEARN XMITTER To Add a Wireless Keyless Entry (not provided) To Erase All Codes OPERATION AND MAINTENANCE Release Engage Wiring Diagram Diagnostic Chart FLASH Power ON FLASHES STOP not connected Troubleshooting SYMPTOM POSSIBLE SOLUTION Page Page Control Box Gate Operator Arm Accessories 953D 916GA 915GA 917GA WARRANTY POLICY CHAMBERLAIN ONE YEAR LIMITED WARRANTY NOTES TEMPLATE FOR POST BRACKET MOUNTING