Walking belt slows down to almost a stop when i get on it

On the rear of walking deck you have the left and right feet. Down the deck is at 0 degree incline, fold them up and you have a 3 degree incline.. You have no incline motor on this model.

It sounds like you have a worn deck and (or) belt. If the machine runs just fine without being on it but stops when someone is on it, then it sounds like a worn belt/deck.
The friction under the belt is so great that it overworks the motor to the point where it shuts itself down. The surface needs to be slick and smooth for the motor to work the least amount.
You could try to put some silicone under the walking belt and see if it helps. It really depends on how many miles are on it.

LOOKING FOR THE USER MANUAL FOR THE Weslo CADENCE 200CS Treadmill

how to oil the cadence 927 thresdmill shuould i oil drive belt as well as walking belt

treadmill stops all of sudden when i am walking

The walking belt slows when walked on the walking belt maybe overtightened, treadmill performance may decrease and the walking belt may become damaged or the opposite the drive and /or running belt may need tightening. Last thing would be that the belt needs lubrication to be applied between belt and deck.

This is normal operation due to putting weight on the belt. Set your final desired speed after you start walking.

When turned on it acts like the walking surface is grabbing.Itgoes and stops its not as bad when speed is increased,but it still feels like it is grabbing.

Hi, I don't have a manual on your particular treadmill but most all treadmills use the same type of belt tension and tracking, which is an allen screw adjustment on the rear tension bar. One on either side. You should have been provided an allen wrench with your treadmill, if not then use one of your own the proper size. Make the adjustment with the unit running at its slowest speed. Clockwise tightens the tension and will draw the belt. Good Luck, this should Fixya!