ATA GDO-11 Spare Parts ATA™ GDO-9v3 & GDO-11 Helical Gear Suitable for the use on ATA™ GDO-9v3 & GDO-11v1 Sectional Panel and Tilt Door Openers Item Condition: Brand New When might you need this?You can hear the motor running but the chain is not moving. FOR SERVICE or QUOTES Please enter your details and we will get back to you shortly! First Name SMS Number Email Postcode