I need help in adjusting the feed dogs, they messed up when I adjusted the timing for the needle and bobbin.

When the sewing machine is properly timed, all the parts work together in a seamless flow of coordination. The needle moves from it highest point down toward the needle plate. The feed dogs reach the farthest point toward the back of the sewing machine. The feed dogs drop under the needle plate. This is just before the needle point reaches the needle plate. The needle continues to move down dragging the upper thread under the needle plate. It proceeds toward its lowest point.
The needle begins its rise back up. A loop of thread forms along the back of the needle. A special cut out on the back of the needle to accommodate this loop is called the scarf. The sewing machine hook slides behind the needle. The point of the hook slides into the thread loop and pulls the thread around the bobbin. The bobbin thread and upper thread wrap together. The needle and hook proceed through their actions under the needle plate. The feed dogs move under the needle plate from back to front.

The needle proceeds to rise again up out of the bobbin area exiting the needle plate. At the same time the feed dogs rise up out from under the needle plate. They begin to move from front to back as the needle continues to rise.
The thread from the bobbin flows through a bobbin tensioner providing resistance to the thread as it is drawn up by the upper thread knot. The upper thread is also under tension. This comes from the upper tension, thread guides, tension spring, and sewing machine take up lever.
The thread from top and bobbin grow increasingly tighter until they form a locked stitch in the middle of the fabric. This process is repeated for every stitch.
How do you adjust sewing machine timing?

The needle, hook, and feed dogs must move in harmony. If they fail to do so, the machine will not perform as expected. When the hook is just slightly out of time with the needle, you will notice skipped stitches. This may begin on only one side of the zig zag stitch or intermittently. If the timing is just a bit more out of sync, stitch formation will become impossible.
If the feed dog timing is out of sync, the fabric will not move through the machine as expected. Threads may bunch up or the fabric may just not move.
As you can see, timing is everything.
click on this link directly
http://www.fixsewingmachines.com/How-to-Adjust-Sewing-Machine-Timing.html

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Hi,

Check whether your sewing machine has feed dogs that can be lowered.Look on your machine to see if there is a lever for the feed dogs. If your machine does not have this feature then lower the feed dogs using the lever on your particular machine, and free-hand at will. Or you can set the feed length at zero, and lighten the presser foot pressure.
If your machine does not have feed dogs that can be lowered, check to see if it came with a feed cover plate, which will allow you to free-hand the material.
However you can remove the needle plate with a screwdriver and remove the feed dogs from the machine. This may need to be done by the experts having proper knowledge and skills.

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