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Hi,
I have several of these machines and they all have the problem you described. It would seem that the lubricant used by Viking has dried out with age and turned to something like varnish. If you can remove the back plastic cover without breaking it, then you can gently heat up the internal mechanism (hair dryer?) and oil, exercise the zig-zag linkage.
Be careful of the plastic, it is old and brittle. Sometime just turning a screw loose will break it, making reassembly difficult.
These are great old machines but sometimes you have to be satisfied with only a good straight stitch.
Bob
A wheel alignment will help if that is the only thing causing the car to go right. If you have hit something , like a curb it could have bent or broken something in the front end. The wheel should return to straight if the alignment is all that is needed.
if there is vibration on the steering when you braking then there is problem with brake discs they could be overheated and not straight. If there is a vibration on your steering wheel on slower speeds then it can be tyre damage or rim
Husqvarna only sold one four wheel steer machine LT1000-14 which was later called a LT4140, there is a shaft that runs vertically through the back of the gearbox, if the steering goes over centre this shaft will bend and the machine will snake in a straight line. you need to replace or strighten this shaft.
Make sure the drive belt is routed right. Go to partstree.com click on husqvarna and put in your model number and click on the drive scematic and it will show the routing of the belt.
When you turn on a #1 Husqvarna Viking the machine defaults all the electronic settings to do a straight stitch at a 2.5mm stitch length, that equates to approximately 10 stitches per inch. The top tension dial sets itself automatically and the only other dial is on the left side of the machine. That dial sets the pressure on the foot that holds down the fabric. It's normal setting is 6.
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