The LM324 is just an opamp … no power at all…
The L272 is controlling the motor, that is the power source.
Check the axles of the 2 spindles. Clean it… the grease is very sticky after this time. Like glue… check it by hand, you can turn it or not.
Disassemble the C-Clip on the top of the axles, then you can pull the wheels. Be carefull not to break it or loose it…