some hydraulic help please !

lantraxco said:

Possible causes of speed differences start at the controls, then the spool valve, then the swivel joint (seals bypassing) and finally the motors themselves. It sounds like you had a case of one motor being more worn internally than the other, so you put one factory fresh drive in, which made the less worn one suddenly the more worn one. Maybe.

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And we have a winner !!, after checking pressures at every location that I could think of. ( including pressures as I was operating and traveling ) I finally installed a new motor on the other side and now it works like new! So yes , both were worn out and the first new install caused the problem to switch to the one more worn out.

Geesh, both motors getting roasted in 2000hrs....one has to wonder why.
Did you have to swap the old ones in when you bought new ones? (some places want the core to rebuild them).
I'd tear one of them apart to see why it blew up at 2000hrs (might even be able to fix them). Watched several youtube vids on drive motor repair, and it seems the number one cause is not changing drive motor gear (planetary) case oil. It seems the oil degrades to the point the gears start shedding metal, and the heat wears out the seals. Eventually, the gears self destruct, or the contaminated oil from gear case gets into the motor, and wears it out.

BTW - thanks for following up on your thread...very helpful to all when problem is shared and solved.

After delving into a swash plate pump, I'd be wondering if a motor could be an easy rebuild with just a few hundred in parts.

fast_st said:

After delving into a swash plate pump, I'd be wondering if a motor could be an easy rebuild with just a few hundred in parts.

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AIn't no difference really, if you can get the parts it's usually easier to do a motor.