31-05-2010, 02:30 PM
hi , i have installed dozens of these subs and repaired many that other installers have previously fitted , the most common problem i have come across is when the hinges are not aligned with the pinion on the sub properly , i.e if you have two hinges on the gate and the pinion on the sub is out of line it creates unnecessary force on the operater especially the seals . hope this helps