Hi, I have had this problem in the past, the steering rod that is attached to the lower steering column and the idler arm at the top of the left front wheel has almost certainly become bent. It should be cranked twice at each end, but the centre section which passes the oil filter should be straight. The steering rod needs to be taken off the machine and the centre section straightened, this is an easy task as the rod is made of a light alloy, after straightening the rod ends should be in line with each other and the overall length should be about 25.5 inches or 65cm.
Hope this works.
Stan B, July 2009