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Old 02-23-2021, 10:07 AM   #1
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Broken down in Wickenburg, AZ

I need a part number for the Air Compressor. I have a 1998 Alpine with the 325 hp engine. I did a search on IRV 2 and no number. I also checked ACA and did not find the number. Can someone point me in the right direction? Thanks.
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Old 02-23-2021, 10:17 AM   #2
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Scott,


First, has troubleshooting/diagnosis confirmed that it IS the compressor that is bad?


Much higher on the "failure rate" scale are the GOVERNOR and the AIR DRYER.
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Old 02-23-2021, 10:22 AM   #3
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Brett,

I experience this problem before. I lost PS, boost for brakes, and engine fan.
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Old 02-23-2021, 10:24 AM   #4
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Brett,

I experience this problem before. I lost PS, boost for brakes, and engine fan.
That would be a hydraulic pump failure.

The air compressor is for suspension and parking brake.

The hydraulic pump plugs into the air compressor but its a seperate part.
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Old 02-23-2021, 10:27 AM   #5
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That would be a hydraulic pump failure.

The air compressor is for suspension and parking brake.

The hydraulic pump plugs into the air compressor but its a seperate part.

Correct!


And, assume hydraulic fluid level is correct and filters not clogged.
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Old 02-23-2021, 10:29 AM   #6
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If you lost ps, brake boost and fan. Those are all hydraulic. Engine driven hydraulic pump or lost flow thru filters in canister
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Old 02-23-2021, 10:34 AM   #7
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Twinboat
The hydraulic pump is driven off the compressor. I also loss air for the Air bags. Last time this happen the air compressor crankshaft broke. I know what the problem is. I am looking for a part number.
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Old 02-23-2021, 10:43 AM   #8
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Twinboat
The hydraulic pump is driven off the compressor. I also loss air for the Air bags. Last time this happen the air compressor crankshaft broke. I know what the problem is. I am looking for a part number.

Scott,


Sorry I can't help with a PN.


But, this is a very unusual failure. And two on the same coach-- wow. Do you know the root cause of either this or the first failure?


I would sure check that the compressor oil flow is good, return line clear, etc.


I don't recall on that compressor if it has a coolant circuit, but if so, verify that is good as well.


Good luck and keep us posted.
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Old 02-23-2021, 10:55 AM   #9
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Ok--if you know what the problem is, then you also know the best, quickest way to find an accurate Cummins part number is to secure the engine serial number and go online to Cummins or call a Cummins shop. As Brett stated, this is a very unusual problem--doubt many owners have hands-on experience with the solution....
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Old 02-23-2021, 11:08 AM   #10
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Old Scout,
I will look it up through Cummins. Thanks
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Old 02-24-2021, 10:54 AM   #11
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Scott we saw a blue Alpine yesterday when passed through Wickenburg, AZ parked in a lot, sorry to hear about your troubles.
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Old 02-24-2021, 02:42 PM   #12
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Curious--"assume" your 350ISC air compressor and hydraulic pump assemblies are on the same shaft, driven off the timing gear, at the front of the engine/back of coach? Is the shaft that broke, a separate piece or is it integrated with the air compressor or hydraulic pump? Very strange that shaft would break twice--per chance do you have an after-market engine fan controller that might be creating unusually high torque at fan start-up?
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Old 02-26-2021, 08:00 PM   #13
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Wasn't me!

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Scott we saw a blue Alpine yesterday when passed through Wickenburg, AZ parked in a lot, sorry to hear about your troubles.
I have a White Alpine.
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Old 02-26-2021, 08:18 PM   #14
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Compress crankshaft

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Originally Posted by Old Scout View Post
Curious--"assume" your 350ISC air compressor and hydraulic pump assemblies are on the same shaft, driven off the timing gear, at the front of the engine/back of coach? Is the shaft that broke, a separate piece or is it integrated with the air compressor or hydraulic pump? Very strange that shaft would break twice--per chance do you have an after-market engine fan controller that might be creating unusually high torque at fan start-up?
The hydraulic pump bolts to the back of the compressor. The crankshaft of the compressor is the part that broke so the crankshaft is the drive for the hydraulic pump. The shop is telling me the previous replacement did removed the timing and properly adjust the lash between the timing gear and the compressor drive gear. A machinists friend tells me this is a critical adjustment. Hopefully this will take care of the problem.
Compressor Part Number - 3558186 RX
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