The simplest way to find the problem will be to remove the motor hood and then have someone watch the motor and front roller area as you use the treadmill. As you step and feel the slip they should be able to see one of the components slow or stop momentarily and that will be the source of the problem. Be very careful that they watch only and that everyone keeps all fingers and toes clear of the electronics and moving components under the hood so that none of the components get damaged and no one is hurt.
The most likely source of the sound on this model is a motor belt that is slipping due to being worn or too loose. If the belt is frayed or looks polished, burned, or cracked then it should be replaced. If the belt still looks okay then the mount bolts for the motor can be loosened until the motor can be moved to put more tension on the belt and prevent slipping. After tightening, you should just be able to twist the belt from 45 to 90 degrees and the belt should be aligned straight with the roller pulley or the belt, motor, and roller bearings can be damaged.
There is also a possibility that the pulley is slipping where it connects to the front roller, in which case that assembly would need to be replaced. The walk belt itself could also be slipping or worn, though typically this will cause slipping without any squeaking.
There is more useful information on maintenance and adjustments in the owners manual and you can find the manual online at Manage My Home. On the Home page, hold your mouse over the square labeled "
" in the upper left of the page and choose the option "
Products and manuals
" from the drop-down menu that appears.
Then enter the following search options:
" and then scroll down to the search results and use the blue
link under "
" to open the manual for viewing online.
You can save a copy of the manual to your Manage My Home profile or, on most computer systems, download or print the manual while you are viewing it.
I've also included a link that might help with finding your purchase history. Remember that each purchase is logged with the credit information you had at that time (in this case 2004) so the record might be associated with a prior address or other personal information that could have changed since then. You might have to search under an older address or phone number to find the original sale record.