Cummins ISX11.9 CM2250 – Service Manual 013-005   Drive Belt, Alternator

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Disconnect the batteries. Refer to the OEM service manual.

CAUTION  The belt tensioner is spring loaded and must be pivoted away from the drive belt. Pivoting in the wrong direction can result in damage to the belt tensioner or cause personal injury.

Pivot the automatic tensioner down to relieve tension on the belt.

Remove the belt.

Inspect the alternator pulley, the water pump pulley, the fan clutch pulley, and the crankshaft pulley for cracks, burrs, and broken or deformed grooves.

Use a wire brush to clean debris found in the pulley grooves.

Inspect the belt for cracks, glazing, tears or cuts, and excessive wear.

Replace the belt if necessary.

CAUTION  The belt tensioner is spring loaded and must be pivoted away from the drive belt. Pivoting in the wrong direction can result in damage to the belt tensioner or cause personal injury.

Pivot and hold the belt tensioner.

Install the drive belt and release the tensioner.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Connect the batteries. Refer to the OEM service manual.
• Operate the engine and check for belt squeal. Excessive belt squeal indicates belt slippage.
• If belt squeal is present, check the routing of the belt and make sure that the belt is installed correctly on each pulley.