Cummins ISX11.9 CM2250 – Service Manual 009-052   Drive Belt, Refrigerant Compressor

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.
• Make a diagram of the cooling fan belt routing and remove the cooling fan drive belt. Refer to Procedure 008-002 in Section 8.

Make a diagram of the refrigerant compressor belt routing, as shown in the illustration, prior to removing the belt. This will aid in installation and help to make sure the refrigerant belt is routed correctly.

The refrigerant compressor fan belt routing consists of the following components:

1. Water pump
2. Belt tensioner
3. Refrigerant compressor
4. Grooved idler pulley.

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.

CAUTION  Applying excessive force in the opposite direction of windup or after the tensioner has been wound up to the positive stop can cause the tensioner arm to crack or break.

Install a ratchet drive with a socket on the tensioner pulley capscrew.

Pivot the tensioner counterclockwise to remove tension from the drive belt.

Remove the drive belt.

Check the belt for damage. Transverse (across the belt width) cracks are acceptable. Longitudinal (direction of the belt length) cracks that intersect with transverse cracks are not acceptable. If the belt is frayed or has any piece of material missing, the belt is unacceptable and needs to be replaced.

Inspect the belt for:

• Cracks
• Glazing
• Tears or cuts
• Excessive wear.

Replace the belt if any damage is found.

NOTE: If a damaged belt spun on a pulley, inspect the pulley for damage. Use the following procedure for pulley inspection. Refer to Procedure 009-051 in Section 9.

Inspect the idler and drive pulleys for wear or cracks.

Clean, check, and reuse idlers with a buildup of dirt, rather than replacing the idler.

Inspect the belt tensioner. Refer to Procedure 009-053 in Section 9.

Inspect the pulley alignment.

Pulley misalignment must not exceed 6 mm for each meter [1/16 inch for each 12 inches] of distance between the pulley centers.

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.

CAUTION  To reduce the possibility of damage to the pulley and belt, do not roll the belt over the pulley or pry it on with a tool.

Use the belt diagram created in the Remove section of this procedure to route the drive belt on the engine.

Install a new fan belt on the pulleys.

Install a ratchet drive with a socket on the tensioner pulley capscrew.

Pivot the tensioner counterclockwise and install the drive belt, slipping the belt over the water pump pulley last.

Release the tensioner to apply tension to the drive belt.

Check the alignment of the belt with the tensioner and the rest of the front end auxiliary drive.

Inspect the pulley alignment.

Pulley misalignment must not exceed 6 mm for each meter [1/16 inch for each 12 inches] of distance between the pulley centers.

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.

• Install the fan cooling belt. Refer to Procedure 008-002 in Section 8.
• 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 be sure that the belt is installed correctly on each pulley.