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Old 06-18-2019, 08:34 PM   #1
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Running Hot/Steering Hard

Hi All. Looking for insight on why my 1996 Dynasty 300 Cummins is running hot and steering hard especially at low speeds. I have been told there is a pump that runs the cooling fan and also works the power steering. Does anyone have insight on if this is the case and what I can do about it!! Thank. This is my first time posting on here, so excuse my mishaps.
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Old 06-18-2019, 09:25 PM   #2
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That is the normal setup for a Spartan chassis,(or any chassis with a side-radiator) one hyd pump/system powers the cooling fan and power steering.
I would focus on the operation of that hyd system. The first thing I would do is check hyd oil level in the reservoir. If oil is at the full mark, check the oil for contamination ie: milky color, dirty, bits of dirt, rust, etc in the oil.
It may be, changing the hyd oil and filters solves both problems. If it doesn't, then the normal diagnostic progression extends to more expensive items.
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Old 06-18-2019, 10:01 PM   #3
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There are many here with way more experience on MH than I .But I have been kinda around hydraulics most of my life. Do suggested above. Every hyd pump has a relief valve and a normal pressure it runs at. They do fail to the relief side of things . Sometimes they are so far open you can here them gushing through by ear or with a stethoscope. There should be a port somewhere to put proper psi gauge on. Don't wait around for help search here & google your symptoms you may at least get a few vids and some learning that help you do get clicks in . the old nogin. Good luck hope its easy fix.
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Old 06-19-2019, 12:03 AM   #4
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When I had that issue with my 93 Dynasty, Monaco told me to replace the fluid with 15w-40 motor oil. Fixed my issue of when hot. I had to be moving to turn the wheels, although it worked fine when cold.

Monaco used AW46 hydraulic oil, ATF, and 15w-50 motor oil for factory fill of the hydraulic system. No rhyme nor reason to why.

Not knowing what is in the system now, you may wish to drain it and fill with AW46. If that cures the issue, then do a second drain and fill to finish removing the best part of the original oil. If the AW46 did not cure it completely, the try the 15w-50 motor oil the same way.

This sure beats throwing expensive parts at it. The oil change worked for me.
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Old 06-19-2019, 08:24 AM   #5
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X2 on 15-50 motor oil.
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Old 06-19-2019, 09:53 AM   #6
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Next weight hydralic or turbine oil after aw46 would be aw68 or dte heavy medium aprox. 20wt 15-40 would be approx 30wt .
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Old 06-19-2019, 10:46 AM   #7
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Quote:
Originally Posted by sgtleydet View Post
Hi All. Looking for insight on why my 1996 Dynasty 300 Cummins is running hot and steering hard especially at low speeds. I have been told there is a pump that runs the cooling fan and also works the power steering. Does anyone have insight on if this is the case and what I can do about it!! Thank. This is my first time posting on here, so excuse my mishaps.
There is a hydraulic pump that runs off the PTO on the transmission. It runs the fan and the power steering. Here is a link to a good thread about it.

Sauer Danfoss CPC-1047 hydraulic pump
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Old 06-19-2019, 01:53 PM   #8
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There is a hydraulic pump that runs off the PTO on the transmission. It runs the fan and the power steering. Here is a link to a good thread about it.

Sauer Danfoss CPC-1047 hydraulic pump
Dennis
Is your hydraulic pump driven off the PTO ?
I would have guessed the ISC engines are like my 03 ISL .
My pump is 2 pumps in one , it is drive from the other end of the engine
I think of it as the front of the engine although it is the rear of the coach.
My pump is mounted just about even with the starter .

Monaco did install 15W50 engine oil in the hydraulic system at one time
don't know why but supposedly they quit because some coaches were
rupturing hoses in real cold situations .
If it was me I would try a heavier weight oil but if it has hydraulic or trans
oil now I think I would drain it all before changing to engine oil .
You can take the hoses loose at the steering gear and it should drain the
entire system .

Ray
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Old 06-19-2019, 03:01 PM   #9
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The first step is to troubleshooting a hydralic system.

A simple pressure check against the specs will lead you down the correct path.

Just dumping out the unknown oil and the adding a different one , without knowing what it uses, isn't a fix.
Even if it steers better, it may not last, and you may be damaging other components of the system.

Find a hydraulic expert rather then chance loosing your steering.
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Old 06-19-2019, 03:50 PM   #10
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Quote:
Originally Posted by RamiDav View Post
Dennis
Is your hydraulic pump driven off the PTO ?
I would have guessed the ISC engines are like my 03 ISL .
My pump is 2 pumps in one , it is drive from the other end of the engine
I think of it as the front of the engine although it is the rear of the coach.
My pump is mounted just about even with the starter .

Monaco did install 15W50 engine oil in the hydraulic system at one time
don't know why but supposedly they quit because some coaches were
rupturing hoses in real cold situations .
If it was me I would try a heavier weight oil but if it has hydraulic or trans
oil now I think I would drain it all before changing to engine oil .
You can take the hoses loose at the steering gear and it should drain the
entire system .

Ray
I thought it was, but maybe I'm mistaken. It sounds more like you're describing. Mine came with AW-46 hydraulic oil.
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Old 06-19-2019, 05:40 PM   #11
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R & O and mobil DTE turbine and circulating oils come in progressively heavier weights. IMHO would be better for hydralic systems than motor oil We replaced many manufacturers called for oils in our plant with Mobil DTE oils they run super clean and hardly ever see a hint of oxidation in pump bearing cases that's are outdoors 24 / 7.. Unlike some installed pumps that had SAE 30 wt. as shipped.
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