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Old 04-25-2020, 09:42 PM   #1
Mini-Skoolie
 
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Power steering Pump

I need help locating the power steering pump (if it has one) on a 1999 5.9 Cummins, RE Thomas. I have looked at the engine and could not tell if one was there. Could it be an internal engine type of setup?
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Old 04-25-2020, 09:54 PM   #2
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I need help locating the power steering pump (if it has one) on a 1999 5.9 Cummins, RE Thomas. I have looked at the engine and could not tell if one was there. Could it be an internal engine type of setup?
Shot in the dark here, but if it's a pusher, it could either be an electric assist mounted on the steering gear / rack (some newer vehicles do this) or no power assist at all, as the majority of the bus' weight is in the rear.

However, here is an image of a couple typical 5.9 Cummins accessory drives, albeit the one on the right is from a Dodge Ram, possibly if yours has a P/S it will look similar.

dodgecummins5.9l6.7lserpentinebelt2003to2012_447x.png
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Old 04-26-2020, 06:08 PM   #3
Mini-Skoolie
 
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I just looked again at my motor and the belt configuration is not like either of the photos posted. I have 2 a/c compressors on the top side of the motor and coming off of the crank pulley, to the left is a belt for the radiator fan. Perhaps I have that electric assist as you mentioned. Itís a little too muddy today to move the bus to check out the steering box.

Attached are 2 photos of my motor. There is a device on the lower right side of the motor that looks like you can take a cap off to add or check a level. It also has a black rubber hose coming off of the top and going down by the block. I see vapor (smoke) coming from it and will drip a little oil. What is that device?
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Old 04-26-2020, 09:57 PM   #4
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In looking at your photo, this is readily identifiable:
Thomas RE Accessory Drive.png
I presume your center pulley would be the water pump, and below it, the crank pulley. The last object beside the water pump does appear to be a fluid reservoir of some sort, as though it might supply a power steering unit.

I did some poking around and it appears that at least some of these may actually have an oddball gear-drive pump. I can only surmise and venture from that, that the shaft/gear arrangement goes through the timing cover and is driven by the timing gears. A strange setup, to be sure. Not sure how you're supposed to go about removing it. Here is a pic of one example.
Gear Driven PS Pump.jpg
Otherwise, I would look further below to see if it has a standard belt-driven pump down lower beside the crank pulley. Hope at least some of this leads you in the right direction...
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Old 04-27-2020, 06:00 AM   #5
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On a 96 5.9 cummins the power steering pump is gear driven. If looking from the front of the engine it will be on the right side under the injection pump, behind the front timing gear cover. Depending on application the vacuum pump is mated to it as well.

On the larger truck engines this is where the air compressor would normally be mounted.
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Old 04-27-2020, 06:04 AM   #6
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Quote:
Originally Posted by budbud7 View Post
I just looked again at my motor and the belt configuration is not like either of the photos posted. I have 2 a/c compressors on the top side of the motor and coming off of the crank pulley, to the left is a belt for the radiator fan. Perhaps I have that electric assist as you mentioned. Itís a little too muddy today to move the bus to check out the steering box.

Attached are 2 photos of my motor. There is a device on the lower right side of the motor that looks like you can take a cap off to add or check a level. It also has a black rubber hose coming off of the top and going down by the block. I see vapor (smoke) coming from it and will drip a little oil. What is that device?
Looks like the oil filler, and crankcase vent tube.
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