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Old 05-01-2021, 07:34 PM   #1
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A/C compressor belt

Anybody know the AC compressor belt part number, for 2019 Dutch Star 4369 Spartan K2/450? I've got a call into Spartan to try to get it from them, but no response yet.

My dash AC was not providing cold air, so I went back to inspect the compressor to see if it was at least engaging, and lo and behold there was no belt on the compressor! No idea when it might have come off; I've only owned the unit since November, and this is the first trip we've tried to use the dash AC, and so it may have been missing all along. And I understand that a common cause of losing the AC compressor belt is actually a compressor lock-up, as opposed to failure of the belt itself, but at this point I don't know since I don't even have a belt.

It appears that the *only* thing this belt drives is the AC compressor. It appears to be a 49" circumference x 3/4" width belt, going around the AC compressor and the main flywheel, and nothing else. A standard, v-shaped belt, as opposed to one of the flat serpentine belts.

Hoping someone on the forum might have the proper part number, so I can try to find a replacement. Stopping in at the local O'Reilly's and they can't even look it up, even if I provide them the engine model number (Cummins ISL9 450HP).

Thanks!

Tom
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Old 05-02-2021, 06:46 AM   #2
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I had to replace mine last year as there were many cracks in the belt. I went to NAPA. Part #9476. Bought two. One for a spare.
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Old 05-02-2021, 06:49 AM   #3
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Photo just in case the other numbers matter.
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Old 05-02-2021, 09:14 AM   #4
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Perfect! Thanks so much ThunderRidge...hopefully I'll be able to pick one (or rather, *two*) up today.

But now that I'm thinking about it, I suppose I should also pick up a spare main serpentine belt, just to be safe, but I've got the same dilemma: can't seem to find a definitive answer on the proper part number for that either. Still haven't heard back from Spartan on my question into them.

So...you wouldn't happen to know the main serpentine belt number, would you? :-)

Thanks again!

Tom
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Old 05-02-2021, 09:41 AM   #5
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Surpentine belt number from Dayco 5080700 or 8PK1780. Prob can cross reference!

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Old 05-03-2021, 06:13 AM   #6
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Hereís a photo of the Cummins serpentine belt. Donít forget to take a picture of the belt routing. Comes in handy because, just when you think you remember,after it breaks and, find out you donít really remember.
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Old 05-03-2021, 09:29 AM   #7
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Thanks Farmerobert and ThunderRidge for posting the main serpentine belt numbers.

Just a follow-up on getting the AC compressor belt: I went into an O'Reilly's Auto Parts to try to get it, gave them the NAPA number provided by ThunderRidge (#9476), and they said they didn't have one (or an equivalent) in stock. They called over to the local AutoZone for me and those guys claimed also to not have it. But then I went ahead and drove over to AutoZone anyway (as I forgot I needed a couple of other things), and on a whim I went ahead and tried talking with the parts guy directly to see if he could check again. This time, with a little more prodding, he searched a little harder, and came up with a *different* equivalent that he *did* have in stock:

DuraLast #17475

I bought their last one (wanted to get two...oh well), brought it home, and with a bit of learning and effort got it installed and voila! Dash AC now works great, so I *don't* have a locked-up compressor (YAY)! :-)

So there's another cross-reference number for folks that need an AC compressor belt. Now I just need to go find me some spares, for both the AC compressor belt and the main serpentine belt.

Thanks to the community for the assistance!

Tom
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Old 05-03-2021, 09:43 AM   #8
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And while we're talking about the main serpentine belt, I'm a little unsure how one goes about replacing that. In particular, how do you get the belt around what I think is the tension pulley, as shown in this picture:

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Oops...the picture seems to have rotated as posted; in its actual orientation, the belt pulley is the *lower* one, and the red housing with the bolt in the middle is *above* that pulley.

In order to get the belt around that pulley, clearly something has to be removed. Is it as simple as removing the bolt on the round red housing immediately above that belt pulley, and that will make it possible for the housing to be moved out of the way so I can get the belt around that pulley?

Tom
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Old 05-03-2021, 02:19 PM   #9
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Half inch ratchet or breaker bar. Fit's in the square hole on the pulley bracket.
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Old 05-03-2021, 02:27 PM   #10
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Quote:
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Half inch ratchet or breaker bar. Fit's in the square hole on the pulley bracket.

Correct-- very easy.
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Old 05-04-2021, 05:52 AM   #11
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I should have added the tensioner is spring loaded. Makes changing belts a breeze.
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Old 05-04-2021, 06:52 AM   #12
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When we attended Camp Freightliner, they suggested we vacuum pack the extra serpentine belt and store it in the coach to prevent deterioration. That would probably work for the extra AC compressor belt, too.

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Old 05-04-2021, 11:25 AM   #13
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Quote:
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When we attended Camp Freightliner, they suggested we vacuum pack the extra serpentine belt and store it in the coach to prevent deterioration. That would probably work for the extra AC compressor belt, too.

Susan
That's a great idea! I worked in a gas station many years ago, back when they had garages for working on cars. I can remember pulling belts off the display that had never been used that had dry rotted. That should help prevent that.
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