Cat 308C CR alternator removal process

[Catmando68]

Does anyone know the service procedure for removing the alternator on a 2003 308CCR excavator? I’ve got a Mitsubishi 4M4 engine. I get a battery light on startup along with a squealing noise. The belt is in good order. The unit will continue to squeal until I rev the engine several times and the alternator eventually rumbles to life. Squeal stops and alternator works. I have yet to determine if the unit has a clutch pulley. The alternator is tightly positioned close to the counterweight and radiator shroud. Any help would be appreciated. Thanks.

 

[Nige]

I get a battery light on startup along with a squealing noise. The belt is in good order. The unit will continue to squeal until I rev the engine several times and the alternator eventually rumbles to life.

First question. Is the belt tension correct.?

 

[Catmando68]

Just checked. Seems a little loose. It will take some effort to get to the adjustment. I’ll adjust and report back. The weather is not helping me right now. Thanks.

 

[Nige]

Just checked. Seems a little loose. It will take some effort to get to the adjustment. I’ll adjust and report back. The weather is not helping me right now. Thanks.

The first thing the squealing noise suggested to me was a lack of belt tension.

 

[heymccall]

 

[heymccall]

I'm betting on idler pulley bearing.

 

[Catmando68]

Just checked. Seems a little loose. It will take some effort to get to the adjustment. I’ll adjust and report back. The weather is not helping me right now. Thanks.

 

[Catmando68]

Update! Thank you Nige and Heymccal. After gaining access to the corroded alternator belt tensioner, I decided to replace the existing belts with Caterpillar part 205-6670. Now the machine starts w no squeaking and no battery warning light. I appreciate your help. It’s great to know that there is a CAT community

 

[Nige]

Nice to hear you solved your issue. A good idea to fit new belts as often tightening old ones can result in a belt breakage soon after. I hope you followed HMC's advice and checked the condition of the tensioner/pulley bearings while you were in there.

 

[Catmando68]

Tensioner and pulley bearings checked out.. Thanks again. I’m ready for tractor weather!