Never seen anything like that. I'd go and test a new one at a dealer or the factory if there's one local enough and see if it behaves the same.
There isn't one at the dealer anymore (140 mile round trip). The nearest one I know of is at the dealer corporate headquarters, which is 600 mile round trip. The factory is in Houston, TX way too far away. There could be one at a nearby packing house pushing produce around right now but no way for me to find out.
Speaking of the factory, it really comes down to the factory on this. The dealer has tried to fix it a few times, done all they know to do. Unlike a Fanuc CNC tech for example, who might bring $20,000 worth of boards with him specific to your control so he can plug in the ones he think might fix the problem, apparently the forklift dealers are only compensated for parts after they can prove the machine needed said part.
So the dealer is reluctant to toss in a new controller for example because they would then be out two or three thousand bucks for that controller if that didn't fix the problem.....that they cannot return or be compensated for. So the manufacturer doesn't want to take responsibility as they remain hidden behind a wall of bureaucracy, and the dealer has push back due to fears of loosing money on an expensive part on a machine they barely made any profit on in the first place. That's no excuse of course but that's all I can figure as to why this is so hard to resolve.
Another aspect is probably my situation as a customer. If I was a larger company buying or leasing many material handling items from the dealer they would probably have offered to take this one back and furnish me with a Linde or better jack many months ago. But they see a smaller concern not so likely to buy or lease much more in the future and thus are not so inspired.
That's no excuse of course but that's all I can figure as to why this is so hard to resolve. What they probably don't realize is when wronged I can be a rather persistant cuss and the negative internet SEO that will result from this controversy once names are named will effect bottom lines for years way more than the cost of this pallet jack.
As to comparing to another one, below is link to a current ad I ran across via search engine on this model. Notice the second bullet point... "Seamless acceleration...."....mine is the polar opposite of that.
http://www.tri-liftnj.com/palletmovers/ecr-327.html
Here's video that shows one in action... seems to be smooth in the video*
http://www.brainshark.com/mcfa/vu?pi=zGHz9NCpjz7jG1z0
Although the below video at first is rather silly, showing trucks running around sped up by the camera, at 00:52 there is a brief glimpse of this model electric pallet jack in action at normal speed.
https://www.youtube.com/watch?v=JDEhEC0nF1I
Another factory video...
http://www.jungheinrich-lift.com/_j...e-ecr-327336-electric-end-rider-pallet-truck/
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*That video reminds me of a point I forgot about until now. The video is showing the jack with a load on it...possibly the maximum load of around 6,000 lbs. When my jack has a load the acceleration situation is
even worse still ! The reason is with the added weight there is more inertia and therefore the coasting time is increased. So, with a load there is still the sudden acceleration but when one backs off to slow it down it tends to coast longer before slowing down, thus being even more difficult to control and even more dangerous. I should probably make a third video with a load on the jack to demonstrate that but I've wasted so much time on this thing already it is beyond ridiculous.