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Old 08-31-2014, 04:23 PM   #1
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99 36FDS changing hyd fan/ power steering fluid and filter

My coach says to use a Nelson pn filter and dextron 2 fluid
Has anyone had any luck using a wix filter that's 10 micron like it says to use ? Also thought about adding some Lucas to tank as we'll. my coach has 103k miles on it and I doubt it's ever been changed .
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Old 09-01-2014, 06:14 PM   #2
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It is Dexron 3 fluid and I would stay with the Nelson filter or one that directly cross references it. What are you adding Lucas to? Hopefully not the hydraulic fluid.
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Old 09-01-2014, 07:31 PM   #3
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I take the top off the tank, Siphon the transfluid out, wipe the tank clean, replace the three nelson filters, and fill it up to the full mark. About 3 gallons, The side of the tank says which type of fluid to use. No additives . No problems so far.
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Old 09-01-2014, 08:06 PM   #4
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I know that their are a few filters that cross the Nelson number that are 3 micron and the Nelson is 10micron
And wanted to add Lucas power steering treatment to help stabilize the dex 3
I've used it in passenger cars with hyd fan and helps them out a bit
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Old 09-01-2014, 08:57 PM   #5
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One of the hoses at the bottom of the tank is actually labelled as the drain, so I usually disconnect that to remove the fluid. If you think it hasn't ever been drained you may want to disconnect the hose at the power steering and drain the whole system. Don't know if a 3 micron may provide too much resistance for the pump so I would stick with a 10. An additive is up to you but I have never used one.
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Old 09-01-2014, 09:01 PM   #6
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Different strokes here but I too prefer the siphon approach....the one sure way to get a hydraulic hose to start leaking is to disconnect it...probably just my dumb luck...
PS--there is probably a lot of old fuild in the brake boost and the fan motor too--think I would just let it mix with the 3 gallons of new fluid and call it good enough....I would also vote for the Nelson replacement filters--they usually come in boxes of 6 filters...I've actually gotten a pretty good price thru Cummins--but not all Cummins shops are alike....
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Old 09-04-2014, 08:04 PM   #7
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I should know better than to post this, but...Lucas additives = snake oil in my opinion.
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Old 04-20-2015, 04:39 PM   #8
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This is a old post but its what I need. Is that a dip stick on top of the canister? Are should I say how do you check the oil? Will the filter come out of there without coming through the bed. On the canister said Dextron 11. I see you guys say Dextron 111. Also what do I need to do to the air compressor for maintenance.
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Old 04-20-2015, 05:02 PM   #9
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Larry,

At least on our 2003, the filters DO come out without relocating the reservoir-- they are short (three of them) and there WAS room. I used: 3- Wix 57317

And, Dexron II was replaced by Dexron III, so III is just fine.

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Old 04-20-2015, 05:24 PM   #10
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There is a black knob on top of the canister which you turn to release. It compresses a seal when turned clockwise so you have to turn it counter-clockwise to release. Don't turn it further than you need to as the dip stick which is attached may fall off.
As far as the air compressor, that is lubricated by the engine so there is nothing to do. Except, you have to service the air dryer and drain the air tank of any moisture.
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Old 04-20-2015, 05:44 PM   #11
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John,

Let me restate that slightly differently: If you get anything but clean, dry air from the tank drains (i.e. water, dirt or worse, white powder) it is a sign that the AIR DRYER has failed and need immediate service/replacement!
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Old 04-22-2015, 03:41 PM   #12
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Thanks John and everyone. These things are not just lying around. You make life good for me.


Larry Pate
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Boston Ky
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