Chamberlain GA420D Review: Chamberlain GA420D PowerDrive 3200 Dual Gate Access System. I purchased the gate about a month ago. The gate works great until I installed the gate lock 915GA. When using the lock, the Lock/Bipart delay switch must be in the "ON" position. This where the problem occurs. The Primary gate does not ramp (slow) down at the end of the set limit. If you have a heavy gate, mine is about 150lbs this is a problem, because the gate does a hard stop. Otherwise the transmission is the taking the full impact of ... Read more »
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