Well here is the info we have been trying to get. :)
The maximum allowable load versus overhang, on the Caterpillar C0.5 and Perkins 402C-05 or 402D-05 at rear and front of crankshaft.
Open the attachment below that reads: Perkins 402D-05 Side Load.pdf
On the left of the graph's. Max. allowable load, R is the center of the pulley, (N)=Newton, which is force. So all you have to do is go an on line Force Converter and convert Newton to Pound-Force (lbf).
Here is the converter I used. http://www.unitconversion.org/unit_converter/force.html
Henry