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Your self propell is not adjustable. The belt runs over a spring tensioner,you either need a new belt or axle bushings. If you pull the top cover off, you can watch the belt when you engage it. With the engine off, can you move the front wheels up or down or forward or backward? If so the plastic bushings are worn out and this changes the geometry of the drive system, making the belt appear too long.
turn it off,let the drive handle go,pull mower backwards.does it lock the back wheels?if you push it forward,can you hear a clicking noise from the wheels?you should do.lift mower,spin back wheel,should either lock,or click,depending which way you spin it.they have spring loaded pawls that drive the wheel.usually easy to fix.usually dirt,or too much grease.take wheels off,have a look
There are really two reasons why the self-propelled wouldn't work. It could either be the belts on the vacuum cleaner are stretched or broken. The belts on this model control both the self-propelled transmission, as well as the brush roller. Here's a video that shows you how to inspect the roller brush and belts to make sure that they are installed properly and working. Try this repair first, as this is the easier one to fix.
The other problem if the belts are installed properly that would cause the self-propelled wouldn't work would be the self-propelled actuator arm. There is a cable that starts at the handle of the vacuum, and runs all the way down to the floor head of the vacuum that controls the transmission. As you pull backwards on the handle of the vacuum, the cable pulls this actuator arm backwards, which then turns the wheels backwards, and when you push forward it turns the wheels forward.
The problem with the way it's designed however, is that if you pick up the vacuum cleaner by the handle of the machine rather then using the carrying handle on the back of the vacuum, it causes too much tension on the actuator arm, and will cause the cable to rip right out of the arm.
This is a VERY common problem on this model. To check and see if this part is broken on your vacuum, step on the handle release pedal so that the handle is in the vacuuming position, push the pedal a second time so the machine lays flat on the floor.
Now if you look right behind the height adjustment switch, and the rug / floor switch where the floor part meets the upright part, you should see a cable that connects into the actuator arm. Pull up and down on the handle and look for movement. Is the cable loose with only a nut attached to it, or is it resting in the actuator arm?
If this didn't help you, and the problem is still happening, please just use the add a comment form here on Fixya and let me know that you're still having problems. I'd be honored to go through and do some more advanced diagnosing with you.
I hope this we helpful to you. If you did find this helpful, please be so kind and leave feedback for me. This is why repair professionals like myself continue to come back and give free repair advice, to get the recognition of a job well done.
It may just be a matter of adjusting the cable. Sometimes they dont get them adjusted just right from the factory,heres what you do. Locate the plastic shroud in front of the push mower that covers the drive unit.Determine which screwdriver or torx bit is needed to remove shroud and remove it. After removal you will see a pulley with belt around it, as you pull the handle back to engage self propel you should see the pulley move into the belt to put tension on the belt. You can do this with it running to see if enough tension is being put on the belt,if not, locate the cable end where the small bracket holds the cable in place. Loosen the cable bracket and move cable until you have correct tension again,hope this helps.
if you look below the headlamp of your vac you will find a cable that attach's to a piece called the actuator arm. either this piece is likely broke or the cable itself. always work the power drive smoothly or things will break. also could be that the smooth belt is stretched and will cause the same problem. belts should be replaced every 4 months. good news is all parts above should be under $5. dont let anyone tell you that you need a power drive assy, that usually isnt the case. good luck!!!
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