Cummins ISX11.9 CM2250 – Service Manual 009-058   Idler Pulley Mounting Bracket

This procedure covers the removal and installation of two mounting brackets used on some fan drive belt configurations. One bracket mounts to the alternator/refrigerant compressor mounting bracket on engines equipped with two alternators. The other bracket can be mounted in various locations, depending on the fan option. Not all configurations will use these brackets.

To make sure the drive belt is routed correctly upon installation, make a diagram of the belt routing prior to removing the belt.

The cooling fan belt routing typically consists of the following components, but may not include all of them.

1. Crankshaft pulley/vibration damper
2. Fan pulley
3. Water pump pulley
4. Alternator pulley
5. Idler pulleys
6. Belt tensioner pulley.

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.
• Remove the cooling fan drive belt. Refer to Procedure 008-002 in Section 8.
• Remove the alternator/refrigerant compressor drive belt. Refer to Procedure 009-052 in Section 9.

NOTE: This step is for a dual alternator idler pulley support bracket.

Loosen and remove the dual alternator idler pulley capscrew.

Remove the idler pulley, dust shield, and idler shaft.

Remove the idler pulley bracket capscrews and idler pulley bracket.

NOTE: This step is for a multi-purpose idler pulley support bracket.

NOTE: This support bracket may be mounted in a variety of locations, depending on the drive belt option. Record the location and orientation of the support bracket prior to removal.

Loosen and remove the multi-purpose idler pulley capscrew.

Remove the idler pulley, dust shield, and idler shaft.

Remove the idler pulley bracket capscrews and idler pulley bracket.

WARNING  When using solvents, acids or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Clean the support brackets, idler pulleys, and idler shafts with solvents.

Dry with compressed air.

Inspect the support brackets for cracks, excessive wear, or other damage.  Replace the bracket if any damage is found.

Inspect the idler pulleys and idler shafts for excessive wear and cracks.  Replace the idler pulley and shaft if any damage is found.

NOTE: This step is for a dual alternator idler pulley support bracket.

Install the idler pulley bracket. Hand-tighten the capscrews.

Tighten the capscrews.

Install the idler shaft, dust shield, and idler pulley.

Tighten the idler pulley capscrew.

Check the idler pulley for freedom of rotation.

NOTE: This step is for a multi-purpose idler pulley support bracket.

NOTE: Be sure to install the support bracket in the same location and orientation from which it was removed.

Install the idler pulley bracket. Hand-tighten the capscrews.

Tighten the capscrews.

Install the idler pulley, dust shield, and idler shaft.

Hand-tighten the idler pulley capscrew.

Tighten the capscrews.

Check the idler pulley for freedom of rotation.

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 alternator/refrigerant compressor drive belt. Refer to Procedure 009-052 in Section 9.
• Install the cooling fan drive belt. Refer to Procedure 008-002 in Section 8.
• Connect the batteries. Refer to the OEM service manual.
• Operate the engine and check for proper operation.