Posted February 22nd, 2016 at 9:59 am by Dan Musick
What is a left hand spring?
In the door business it could mean one of two things.
It could mean the wind of the spring, which would be a left wind spring. A spring wound the opposite direction would be a right wind spring. Doors with two standard torsion springs normally have one left wind and one right wind spring.
The designation “left hand” could also refer to the location of the spring on the shaft in relation to the center support bracket.
Because the phrases “left hand spring ” and “right hand spring” are not specific designations,” it is essential that you clarify the meaning of your terms when ordering just one spring.
If, by “left hand,” you mean the spring is mounted to the left of the center support bracket as in the picture above you would need to order a right wind spring.
If, by “left hand,” you mean the wind of the spring, you need to order a left wind spring which is normally wound to the right of the center support bracket as pictured below.
On standard systems the next component beyond the winding cone is the cable drum. Beyond that is the end bearing plate.
On outside lift systems with double horizontal tracks the cable drum is mounted outside the end bearing plate, as pictured below.
Unlike the standard system where the cable comes off the side of the drum facing the jamb, on outside lift, double track systems the cable usually comes off the side of the drum facing the inside of the garage. If you have an outside lift system, and if the cables come off the drums as they do above, you would mount the left wound spring to the left of the center support bracket and the right wound spring to the right of the bracket. You will also wind down on each spring rather than up.
If you have only one torsion spring on a door, and if you happened to have ordered a spring with the incorrect wind, rather than reordering a new spring with the correct wind, the simple solution is to remove the spring and install it on the other side of the center support bracket. In some cases you may need to relocate the spring anchor bracket to make room for the spring to fit.