If you have good vacuum to the wipers, doesn't sound as if lubing wiper motor will do much more so a rebuild is probably in order. There are some hard rubber vacuum port selector sliders which can warp & dry out or the leather seal on paddle can leak. From the symptom, it kind of sounds like the reversing valve may not be switching or is leaking.
Out of curiosity, if moving the blades manually--no vacuum--, when nearing almost the top of sweep and almost the bottom (not park position at full down but a couple of inches up) there should be a small click coming from the motor as the reversing valve snaps to direct the vacuum to the other side. If you hear that snap, then something is most likely leaking, if not hearing it then a spring may be broken or the valve stuck. Either one will probably need a rebuild and since the motor has likely not been touched in 60 years, not a bad idea anyway.
Ficken wipers comes highly recommended for the rebuilds.
http://www.wiperman.com/ They have done many for members here with high marks and decent turnaround.
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=81987