I was getting so frustrated with the noises and then the stopped mover, I was ready to buy the heavy duty light rail mover.
Communication attempts through the Argamover website were futile, and I had the light rail (5.0 I think) selected and ready to order.
But sending emails through eBay to Argamover was constructive, and I received responses to my questions.
I could not recall what the warranty was on the Agramover, but the 5.0 is lifetime. During my most frustrating moments with the mover I have, a lifetime warranty seemed awesome!!
In case others have the same questions that I had, here is a summation of what I learned, from the owner:
The Agramover warranty is 1 year from purchase.
After heavy use (i.e. two lights), it should need maintenance after a year or so. In my dry climate, cleaning and greasing the rail is necessary every 3-4 months.
For multiple lights, tandem install is better, for mover longevity and lower maintenance, then side by side light placement.
A squeak in the same spot (back and forth) is a rail problem. My own opinion - Buy the rail from Agramover - more $$ but worth the lack of headaches.
My Agramover is less then a year old and used maybe 4 months since I bought it - due to the noise issues. This is what the owner said about noises - "Sometimes there is an intermitten squeak until the dimples in the wheels wear in to the point where the wheel flanges engage, then the noise goes away for good. If this is the case, you should have noticed the noise lessening over time. If the noise level has remained the same throughout, or gets worse, then there are two possible other causes. The most common is a wheel bearing. Yes, brand new wheel bearings can sometimes fail, about 1 in 200. The easiest way to diagnose bearing failure is to unplug the unit, leave the entire load mounted to it, compress the torsion spring on the motor assembly by placing your thumbs against the aluminum frame and squeezing the white spacers with your fingers to withdraw the traction wheel. Then move the unit by hand from one end of the rail to the other. You'll be able to FEEL the interference of the bad bearing and possibly hear it squeak. The last possibility seems to be unique to the last batch of wheels we got from our molder. Some don't fit the shafts very tight, so the wheels slide outward from the shaft until they're super tight against the inside of the rail. (The mold has since been fixed and they're running a new batch for us) If this is the case, you'll notice an obvious gap between the wheels and the bearings. The fix is replacing the wheels. One of my customers recently encountered this problem and he removed the wheels, wiped the shafts with nail polish remover as well as wiping the ID's of the wheels with a cotton swab and nail polish remover, then put a drop of super glue on the shafts before reinserting the wheels. I stand behind my products whether you buy 1 or 100."
My squeaking issue was the improperly molded wheels. Changed the wheels and it's all good! My plants respond well to the mover, with two 600w HID.
Again, I highly recommend this product.