the motor ran continuously while the machine was on....or rather, kept the pump running....
as a solid tub machine, most were time filled, and had a tendency at times to overflow into the outter tub, until the timer clicked in to agitate...
for the most part, it would not fill both tubs to a point of over flowing onto the floor.....but at the time, I guess it made more sense, or precaution...
banging solenoid machines had an extra timer increment for filling past the markings, versus the reversing motor versions.....
depending on water pressure/restrictors/temp, 1 minute would equal about 1/4 to 1/3 tub fill....
something you wouldn't normally catch, but on a commercial machine, the water continues to flow for 30 seconds after agitation begins in the wash portion, and water flows continuously during the 2 minute rinse....you have to account in a commercial machine, time is money....
on a residential machine, the water stops as agitation begins.....and the rinse is 4 minutes, 1 minute overflow, 2 minutes agitation, 1 minute overflow again, then spin..