Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Let's begin by checking your transmission drive belt. If your drive belt is slightly loose, or worn, it can slip, and cause the problem you are describing. If your belt is ok, we can go to the next step. Thanks again!
Double check, to see if your drive belt is fully tight, when your brake/clutch pedal is fully released. Have you noticed any oil leaks on your transmission? Make sure that your bypass rod is pushed all the way in. I am referring to the rod you pull out, in order to push or roll your mower, when your engine is not running.
Is there a build up of dirt or debris on top of your transmission? If so, this can prevent the bypass lever on your transmission from moving fully in and out of bypass/roll position. We can continue from here.
How old is your mower?
Thanks for this information.
There is an oil fill port on your transmission, but it is hard to access, unless you remove your transmission from your mower.
Unless you have noticed a leak, your hydraulic oil level is probably ok.
If your transmission have trapped air inside, this can affect the performance of your transmission. To remove the air, if present, you will need to purge your transmission.
Take a look at the information in the link below. It explains how to purge your transmission.
Before beginning the purging procedure, you will need to have both rear wheels off the ground.
Based upon what we have covered thus far, I am lead to believe that you have internal transmission issues, if the purging procedure does not help.
You are very welcome! I do hope all goes well for you.