HELP!! Removing a Cummins air compressor. - TheDieselGarage.com
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post #1 of 17 (permalink) Old 12-23-2006, 01:32 AM Thread Starter
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HELP!! Removing a Cummins air compressor.

Hows it come off? It's on my NT280B Serial # 311835. Original part to the truck and engine.

I got the fuel pump off and the 6 bolts that are on the compressor side of the piece that goes between the acessory drive and the compressor. Nuthin. So I took the 5 hard to get to bolts off at the acessory drive side and still wont budge. I been prying, hammering etc.

Managed to break the connecting rod in the compressor. I can see it but it still won't come off the engine. The compressor and the other part between the accesory drive and the compressor will spin slightly, an inch or so but it just wont come off.

My Cummins book says "Remove compressor" so it's no help.

Heres the only pic I have. Truck is at my work so I had to hitch a ride home.
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post #2 of 17 (permalink) Old 12-23-2006, 01:46 AM
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If the slip collar is froze on the nose of the compressor you have to pull the pulley off the accessory drive, pull the drive, and beat it til it comes apart. You may be buying an accessory drive also (under $500). Good luck and Merry Christmas!!...T
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post #3 of 17 (permalink) Old 12-23-2006, 01:47 AM Thread Starter
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How does all this come apart? is this something I can do in the truck?
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post #4 of 17 (permalink) Old 12-23-2006, 02:14 AM
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Looks like the older 1 piece shaft and housing. If it hasn’t been updated to the later 2 piece compressor shaft and housing you are in for a ride.

Cummings made a kit to fix that but big $ unless you can find a used one.

The accessory drive pulley is pressed/pulled on the long compressor crankshaft with the 1 5/16” hex nut found on the front of the acc pulley. Problem is that it’s all one piece crankshaft to the nut. You need a short puller or you have to pull the shroud and radiator. They make a puller for that, OTC i think.

If the crank is damaged might as well go to the late 2 piece compressor shaft kit. Right now I’d say used would be the only way to go $ wise.:shrug:

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post #5 of 17 (permalink) Old 12-23-2006, 02:34 AM
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I’m looking around the net now. They used to be a lot of those out there but now unless you can find someone with an old truck and a good compressor I think Cummins would be a waste of time..

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post #6 of 17 (permalink) Old 12-23-2006, 02:44 AM
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sounds like its sized to the shaft or the weight is not helping. ????

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OH...AND A FEW TWISTS OF THE FUEL SCREWS ....THANKS AGAIN... FJH!
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post #7 of 17 (permalink) Old 12-23-2006, 02:49 AM
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all I found were these

http://images.google.com/imgres?imgu...3Doff%26sa%3DX

http://images.google.com/imgres?imgu...3Doff%26sa%3DX

1978 MACK RS700L
285 HP @2100 RPM 1080 TORQUE. @1200 RPM
2 STICK 6 SPEED, 4.17 REARS ON 34K CAMELBACK SPRINGS,206"WB, 4" STRAIGHT STACKS BLOWING BLACK,

OH...AND A FEW TWISTS OF THE FUEL SCREWS ....THANKS AGAIN... FJH!
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post #8 of 17 (permalink) Old 12-23-2006, 03:07 AM Thread Starter
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I went to work and shot a pic. There are several places here that can rebuild it. I gotta get it to them tho.

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post #9 of 17 (permalink) Old 12-23-2006, 03:19 AM
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Yep, that’s the log shaft compressor. Cummins had so many complaints about RR on that unit that they later made a 2 piece unit so you could just unbolt the compressor housing and slide it off the splines.

It has to come off with the internal gear and shaft out of the accessory pulley. I changed my 71 Pete NTC335 drive over the first time I got into that mess. Best way is to find an old Cummins with the split shaft setup.

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Leno: ‘Remember the Old Days When Obama’s Biggest Embarrassment Was Joe Biden'

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post #10 of 17 (permalink) Old 12-23-2006, 03:22 AM Thread Starter
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So If I pull off the belts and somehow get the pully off I can atleast get it apart?
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