the blade should have a small amount of lead (forward), and be set about 1-2 inches foward of square at the grass board end,
this will alow it to off set the strain and run square while in operation, thus resulting in a straight line for the blade and pitman during operation, most of the jd mowers of the past had a eccentric adjustment at the rear of the enter shoe assembly to set the lead properly removing the lag (rearward) that develops over extended use.
if your blade is setting with lag you can turn the eccentric bushing left as far as nessacary to properly set the lead of the blade.
the mower need also to be in registar to cut properly, at both ends of pitman stoke, the knive needs to be centered with the guards, point of knive should be in center of the knive guards, if not the mower will not cut properly.
if the registar is not right and the blades are not center of the guards at the end of the strokes it will not cut all the grass causing choking and uneven cutting,
these issues are corrected transferring washers on the yoke of the drag bar as nessacary, and pull bar adjustment
the knives need to run in the guards so that the knive is aetting flat and the point is setting on the guard plate, with the knive holders fitting snug, this needs to be checked at each guard, moving them up or down along the bar, these guards are malleable and can be bent without breaking, by stiking them on the thick part just ahead of the plate when the guard is bolted up tight
i hope this might help
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