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You should be getting fluid from both lines leaving the pump at all times, if the line closest to the rear of the truck is not working then the intermediate shaft connecting the two halves is most likely broken. You can take the pump apart pretty easy to inspect if you need to and even reduce it to one pump to simplify the installation or to remove the bad half of the pump if necessary. You can feel free to call me anytime tomorrow if that does not answer your question.
You can reassemble the pump as just a single in single out, this would probably be better for you anyways, smaller reservoir, increased service life of the fluid, easier to plumb, the only downside is if you were using both the winch and the other hydraulic unit (i can't remember if you said second winch or tipper) at the exact same time. Otherwise its a bit overkill for your application. I have singled my pump out already and operate a fairly large knuckle boom crane and dual cylinder dump bed without issue, you will just need to add a couple valve or spool block of some sort. I run all of my stuff off of the knuckle boom and routed the dump bed through the accessory spool of the crane. If you have questions on how to do this you can call me, you can also look in the -30 tm for a breakdown of the pump, it is pretty simple. Hope this helps.
