Clarification
I did not mean to imply that using the MaxExtract feature is a bad thing to do. This is a handy feature to have when you are washing fabrics that absorb water and can take a while to dry (things like plush bath towels and denim jeans), either by machine or on a clothesline. The owner's manual and video both address these very examples.
The problem of the weakened belt can happen when the maximum spin feature is used for each and every load, regardless of size. As I mentioned, this was a problem that I ran into and spoke to Maytag about, as well as the service technician who repaired my machine. It seems that many people, myself included, were doing this. For the early models of the machine, the 3000 and 4000 series, Maytag was caught off guard with the way people were actually using the then new Neptunes.
Other manufacturers at the time, such as Miele and Asko, were using spin speed as a selling point for energy efficiency and advanced technology. It became a little embarrassing for Maytag to have a machine whose top spinning speed was 1000 rpm, while other makers had machines with a top speed anywhere between 1200 and 1600 rpm. Coming up with a name that sounded close to what the competition was offering was a way to address this. The difference, though, was in the way that the machines were designed for use. The technician told me that Maytag did not originally expect the feature in the early models to be used as heavily as customers were using it in actual practice - it was thought that it would be looked at as an extra that would used occasionally, but would mostly be ignored.
In terms of the design issue, these Neptune models had two belts attached to the drum, one which provided for reverse rotation during agitation, and another for spinning the wash cylinder during extraction. The original design of the spinning belt was, it was found, not strong enough to allow for continual (as in each and every load washed) of the MaxExtract feature. The problem showed itself over time with symptoms as the machine spinning at reduced speeds, or not at all. Not hearing the high pitched whine was the major indication of the problem, according to Maytag at the time.
After Maytag got enough complaints, and bad PR, this matter was fixed with a more durable belt. It appears that Maytag made other changes, and refinements were made to the Neptune machines before the line was discontinued. One of the things that the service technician told me was what I mentioned in the previous post. There is nothing wrong with the MaxExtract feature, but don't use it more than you really have to. This is advice that I am still following with my current machine. The way it works is that the spin cycle is extended for about a minute or so, and some models allow for a little more than the 1000 rpm speed - this is the case for the 6500.
I had the 3000 for about three years when this problem happened, and for five years after that without incident. My 6500 has not had this or any other issues in the two years since getting it.
Darryl