求翻译：3）在将弹簧组安到底部面板之前，首先要把它从门上预载。预载需要测量上部的螺丝与叉车支架之间的距离。如要预载弹簧组，旋转调整杆直到调整杆的长度适合，门底端弹簧的伸开长度为10cm左右。是什么意思？

3) prior to the spring group security in the end panel, first take it from the door pre-loaded. Preloaded with the distance between the screws and forklifts need to measure the upper bracket. To preload the spring group, rotate the lever until the length of the lever for the door at the bottom of th

3) in the spring group, bottom panel, first we have to put it on the door from the preload. You need to measure pre-loaded with the screw top truck the distance between supports. If you want to pre-loaded spring set, turn the adjusting lever to adjust the length for the bottom, the door opened the s

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