![]() ![]() ![]() Four-foot levels only read accurately at that spot, so you need to confirm that the entire length of the beam is straight. If you still see a sag.you need to crank till it is straight. Better still, you should go to both ends of the beam and look along the bottom of the beam. If it is directly in the middle of the two lines, you will confirm that the jacking is complete. When you believe that the beam or sag is now level, place the level horizontally under the beam and observe the center window. This is made easier by placing the string line tight along the beam's length enabling you to observe the jacking yourself as you crank. If you are alone, you will have to check several times yourself. If you have a helper, he or she can actually watch and direct you in the cranking action till the beam is level. If you are under a long steel beam, you will need to either sight the sag as you lift by going to both ends and actually observe the lifting action. The post is now straight.this is essential for safety.īegin cranking slowly. Repeat this until the bubble remains in the center as you move the level back and forth. You will need to reposition the level several times between the first and second locations, tapping the bottom each time. You will note that the windows that were in line are no longer aligned. Move the level back to the first location and again tap the bottom of the post. Move the level 90 degrees away from your initial placement and repeat the tapping process in step 4. Make sure that the top of the post remains under the beam and does not wander. If you have never used a level before, you will need to tap the bottom of the post with the hammer in such a direction that lets the bubble move to the middle of both windows. Place the 4-foot level against the post in the same direction of the post. At this point you only want to snug the fit. Place the top steel plate provided with the jack on top of the screw bolt and begin to crank the screw with the crank rod, also provided. ![]()
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