BABHMJ's dishwasher husband

Tannerdis, I followed your instructions. The motor disc rotates freely. I see no valve in the hose, which exits the motor, then snakes around above the floor of the dishwasher, above the floor of the sink, and enters the side of the garbage disposal, which is old. The dishwasher seems to operate normally on the wash cycle. On the drain cycle, it does not drain, then quits. Removing the hose from the disposal shows a trickle of water being pumped out during the drain cycle, but not the flood expected. It ends when the drain cycle ends. The frame of the motor is corroded, but it seems to operate OK. Ideas? Could the drain or the hose be blocked? Is there a valve which shunts the pumped water either through the dishwasher wash syster or out through the drain? It might be stuck or broken. Can I find a schematic for the thing somewhere? Sears used to include an exploded view of their gear, with the components all numbered, and a numbered component list for that device, with it's respective part nuimbers, so you could order replacements. Where could I find such a thing? If I could understand how it works, perhaps I could fix the bloody thing in time for Sunday's feed.