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My Sony Walkman the motor runs the batteries don’t work but with a cable it does when I push play one of the spindles turns but not the other I think the problem is that the gears aren’t connecting properly how do I fix it can I fix it

Kaysie Elvir you should only have one spindle working. The right pulls the tape during play and forward the left for the rewind. If you have it disassembled take some good pictures and post those with your question. Use this guide for that. It will allow us to see what you see. Here is the service manual which should help you with your repair Sony WM-1 SM