Don.
The starting lever has a nameplate which is a rudiment from the direct reversible dieselengine, hence the 4 positions. First of all, plate 29 has a wrong translation "Umsteuer"does not mean "reverse" it means shifting of the camshaft to ahead or astern position. As the direct reversible engine required a lot of complicated operations as, lifting the cylinder valve rollers up from the camshaft, moving the camshaft axially, lowering the rollers down on the camshaft, starting again etc. they combined parts of these operations in the starting handle by adding links and cams, including various interlocks, to the startinglever movements. During these timeconsuming prosesses the handle had a position "operate". On the non reversible execution the starting lever had only two functions moving the rollers down ( start) or moving the rollers up ( run) from the camshaft, thereby distributing starting air to the cylinders (start) and shutting of same (run) soon as you achieved the proper revs.
Tore