• Recently Viewed  
  • Cart 

    Your Shopping Cart

    Showing last added item

    Parts Qty

    Total items:

Can't locate your model number? Use our finder

Choose your product type

Common model number plates

View sample model numbers by selecting your product brand


Porter Cable Cordless driver/drillmodel #850

Add this model to "My Models" for easy access later.

Porter Cable Cordless driver/drill Model #850 was saved to your profile.

You have reached the maximum number of models that can be added to your list.

Please Sign In or Register to have unlimited usage.

Questions & Answers about this model powered by

I have a Lifestyler expanse 850 model 831.297191 treadmill. The belt speed changes without changing the control. What causes this?

I have a Lifestyler expanse 850 model 831.297191 treadmill. The belt speed changes without changing the control.

Posted April 10, 2009


Jimmy K, April 20, 2009

the most likely thing to cause the treadmill to change speeds while you are walking on it is the walking belt needing lubrication.

to test the walking belt lubrication, do not turn the treadmill motor on. set the elevation to the highest level. stand near the front of the walking belt. push yourself firmly toward the rear of the treadmill. if the belt is properly lubricated the belt will take you to the rear edge of the treadmill and dump you off on the floor. if you move and stop, the belt needs lubricating.

the part number for the belt lubrication kit is 219168. you can buy it at [www.searspartsdirect.com]. the cost is around $4.00. the application instructions should be in the package, but in case they are not here is how to apply the lubrication.

turn the walking belt until the belt seam is along the top of the front roller. raise the belt on one side in the center of the walking board front to back as high as you can. apply â½ the tube of lubrication to the walking board in a zig zag fashion moving from front to back. move the belt until the seam comes up on top of the rear roller and lift the belt again and put the rest of the lubrication on the walking board in the same manner. turn the treadmill on and walk on the belt for 10-20 minutes. walk all over the belt to distribute the lubrication evenly on the walking belt and board.


M-F 6:30 a.m. - 10:00 p.m. CST
Sat 7:00 a.m. - 9:00 p.m. CST
Sun 7:30 a.m. - 9:00 p.m. CST

Thank you! Your model has been added.

Save model in your profile permanently

Don't have a profile? It's fast and easy to create one. Sign up now and you can access your models anytime, anywhere.

Sign In Register

Save to this computer*

This option is valuable if you expect to revisit Sears PartsDirect using this computer and browser in the future.

*Saved models will only persist on this computer and browser. Model retention may be affected by your browser settings.

OK, Continue