What is the belt pattern on the mower deck for a power kraft 18/42 series.

Hi,
I believe you have a Powr Kraft made by MTD and sold by Montgomery Ward, when they existed, and by MTD afterwards since they own the brand name. I viable MTD model number would be 136S699G088 that can be entered at the MTD Manual Archive and a serial number of 1 at the following link:
PDF Manual Web Archive
There you find two choices for manuals which have the parts breakdowns and directions, as well as a parts list separately.
Peace,
Clarke