Abstract: A method of manufacture of a power assisted steering control valve including a pinion shaft, an input shaft and a torsion bar comprising following steps: receiving into clamping fixtures of an assembly machine a pre-assembled loose assembly of said pinion shaft, input shaft and torsion bar, establishing and recording a predefined rotation clearance between a shoulder of said pinion shaft and an end of said input shaft, rotating said input shaft in opposing directions between rotation limiting stops to said pinion shaft, pressing a first end of said torsion bar into said input shaft to form a locked together assembly of said input shaft and said torsion bar, and axially advancing said assembly of said input shaft mid said torsion bar into said pinion shaft so as to press a second end of said torsion bar into a locked together assembly with said pinion shaft.

Abstract: A method of manufacture of a power assisted steering control valve; said control valve including a pinion shaft, an input shaft and a torsion bar; said method including the steps of: (f) receiving into clamping fixtures of an assembly machine a pre-assembled loose assembly of said pinion shaft, said input shaft and said torsion bar, (g) establishing and recording a predefined rotation clearance between a shoulder of said pinion shaft and an end of said input shaft, (h) rotating said input shaft in opposing directions between rotation limiting stops ?o as to establish a midpoint of rotation of said input shaft relative to said pinion shaft, (i) pressing a first end of said torsion bar into said input shaft to form a locked together assembly of said input shaft and said torsion bar, (J) axially advancing said assembly of said input shaft and said torsion bar into said pinion shaft so as to press a second end of said torsion bar into a locked together assembly with said pinion shaft.