The drive belt on the Wacker BPU2440 and BPU2950 should be inspected after every 25 hours of operation. New drive belts should be inspected after just 5 hours of service. On the Wacker BPU2440 and BPU2950, drive belt tension and quality is considered vital for proper machine function. 

For this service, you'll need a 6mm allen wrench and a 13mm socket wrench.

• Adjust belt for 1/4"–3/8" (5–10 mm) deflection when pressed midway between the belt pulleys (x)
• To tighten the belt, reduce the quantity of spacers (y) between the pulley halves (z); to loosen, add spacers
• Remove belt cover
• Remove the four hex nuts holding the pulley halves together
• Remove the outer pulley half and remove spacers as required to tighten the belt. Normally, removing one spacer is sufficient. When installing a new belt, remove or add spacers as required to obtain correct belt tension
• Note: Place used spacers in equal quantities on either side of the pulley to maintain belt alignment. If spacers cannot be placed equally, place odd spacer to the outside of pulley
• Secure pulley halves together with hex nuts and recheck belt tension
• Replace belt cover