You probably purchased the incorrect walking foot for your specific machine. check and make sure if you have a high shank or a low shank....the way to determine if you have a low-shank is to measure the screw from the plate and look at the distance if it is 5/8 then you have a low, any higher about 1in. then you have a high shank, so you would purchase a foot depending on your shank.
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There is a "fork" or straight bar on the needle-screw side of the foot that wraps around or sets on top of the needle screw. This fork/bar moves with the needle and causes the foot to pull fabric through the top, much like the feed dogs underneath.
Be sure you get a walking foot that will work on your machine!
When installing the foot, it helps to raise the presser foot bar as far up as it will go and that the foot is tilted slightly to slip in on. If you have a knee-lift bar, using it to lift the presser bar will sometimes give you just what you need to get it on. Do NOT bend the walking foot to put it on.
Walking feet attach much the same way on most machines. They can be boogers the first couple of times. It helps to tilt the foot and guide it toward the needlebar from the side in order to get the fork (if your foot has a fork--some just have a bar that sets on top of the needleclamp screw) around the needleclamp screw. In cases of extreme frustration, I've removed the needleclamp screw and then reattached it once the foot is in place.
Just use patience. If frustrated, walk away. Whatever, do not force or bend the foot in order to install.
The walking foot has a spring loaded lever that rides on the needle clamp screw. If you lower the needle into the hole on the walking foot it will remove the pressure and make it easier to attach the walking foot to the ankle.
if the pressor foot anvil doesn't move up and down /back/forth , the machine might be in "DARNING " mode this is usually a small button in the bobbin area , but some machines have them on the back of cabinet as well
Does your 830 have a black needle clamp and screw instead of the standard nickel plated clamp? If not, the walking foot forked driving lever may be damaged by having used the machine with zigzag engaged. Another problem with older 830 machines is that the needle clamp has been repeatedly tightened very tight, causing the needle bar base to become damaged so that the clamp is no longer perpendicular to the direction of sewing...In other words, the clamp sets crooked on the needle bar.
The black clamp made for the walking foot had a specific diameter for the forked driving lever of the walking foot. The black clamp was also longer so that when using a wide stitch width, the driving fork of the walking foot did not collide with the needle bar clamp screw on the right side.
Please reply with your observations.
The foot is attached as normal, but when you're attaching it, the fork-shaped part that sticks out of the right-hand-side has to be hooked around the round pillar sticking out horizontally from the right-hand-side of the needle bar and that holds the needle securing screw. When the foot is down, you will see that the upwards motion of the needle bar raises the upper set of feed dogs on the walking foot - the whole purpose of the walking foot is to provide, effectively, a set of feed dogs on the top of the material as well as the toothed ones below the stitch plate - this allows multilayered or thick materials to be sewn as when doing quilting.
When installing the walking foot, you must make sure that the arm that moves up and down is resting on the needle clamp screw. That arm controls the movement of the foot and that allows it to do its "walking" if it is not resting on the needle clamp then it will not work at all.