Troy-bilt self-propelled won't engage drive

read all instructions before operating your mower that will include where the port is this is your manual https://www.troybilt.com/en_US/prior-year-models/troy-bilt-self-propelled-lawn-mower-model-12ag839e711/12AG839E711.html

most have small leaf springs that let it toggle back and forward, if they brake can cause this problem. Then it may just need the wheels removed, clean the parts and lubed

I hope the model # sticker is still on it. MTD bought Troy Bilt.
Here's a site for parts.

http://www.troybiltpartsonline.com/pages/oemparts?aribrand=TRB&kw=troy%20bilt%20push%20mower%20parts&cr=188066796194.&gclid=EAIaIQobChMIuLyAxZ3E2QIViCSBCh14XgVbEAAYASABEgLz-PD_BwE
hope this helps a little.

Check oil level . Dump out old oil and fill with new 30w oil.

put belt dressing on the belt

I'd love to help you, but I think you need to rephrase your question. There is no "Starter Cable" on this mower. Sorry.
James

Remove the cover from the self propel and check the engagement cable for excessive stretch.

Also check the drive belt for wear or breakage.

try putting your serial number and model number here. http://www.troybilt.ca/troybilt/troybilt_manual_search.asp

Does the drive shaft going to the wheels turn at all?

If it doesnt you may have a unsecured pulley on the engine.

If the shaft does turn when you engage the tranny your next stop is taking the wheels off and checking the wheel clutches. Sometimes called sprag clutches. They are probably both stuck in the unlocked position. You need to clean them up by removing all the greasy material covering them and putting them back together with just a few drops of light oil.

I hope this helps. Good luck and be careful!

Go to www.troybilt.com and on the top of the home page click on FAQ (frequently asked questions) and on that page click on "owners manuals". You will need your model number of the mower. I hope this helps!