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Old 10-08-2012, 02:21 PM   #1
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Drive Belt Routing. Seriously?

I'm in the middle of doing PM on my 10 year old but new to me Class A.
I have replaced the water pump and had the starter and alternator rebuilt. So far so good. After replacing the alternator I am attempting to install the drive belt and for the life of me can't figure out the correct routing.

I have a Cummins 5.9 ISB 300 HP in a Freightliner XC Chassis. The belt drives the water pump via the back side (smooth side) of the belt, then the ribbed crank pulley, ribbed fan pulley, ribbed alternator pulley and RIBBED tensioner.

Maybe it's because I'm working upside down from beneath the bed, or have had an insufficient amount of sleep, perhaps not being too swift or a combination of all three but for the life of me I cannot figure out the correct routing.

The tensioner is below the alternator. This is not a pick up truck installation.

I have the Cummins overhaul manual and 3 huge Freightliner O/H manuals and none of them show my instal on the 5.9 ISP.

I appreciate any help you folks can provide.


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Old 10-08-2012, 05:20 PM   #2
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Google the Cummings 5.9 ISB 300 hp for the belt routing diagram. I found it but do not know how to link it to you.

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Old 10-08-2012, 07:04 PM   #3
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This might help

On my ISB the a/c compressor runs on it own belt, so the without a/c diagram matches...
Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel -1972 Moto Guzzi
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Old 10-09-2012, 06:14 AM   #4
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Hi Trackman:
I was unable to come up with anything but appreciate your input.

Hooligan: Thank you for your service.

Lying in bed this morning the routing occurred to me. It is the one you have pictured to the right. The A/C is driven off of a separate v-belt from the free wheeling fan.

Thank you very much for the diagram. I'll print it out and tape it to my maintenance log. I'm sure I'll forget the next time as well.

Working on this rig hanging almost upside down from beneath the bed is pretty uncomfortable especially at 61.
I recall the days when my best work was done on the other side of the bed.

Once again you folks on the forum came through for me.

Best Regards,

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