How do you change the harmonic balancer pulley on a 1990 Volvo 740?

To change the harmonic balancer pulley on a 1990 Volvo 740, first disconnect the negative battery cable and remove the accessory belts. Then, use a harmonic balancer puller to carefully remove the old pulley from the crankshaft. Install the new pulley by aligning it properly and pressing it onto the crankshaft, ensuring it is seated correctly. Reattach the accessory belts and reconnect the battery cable to complete the installation.