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Old 04-20-2020, 10:04 AM   #1
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ATF or HYDRAULIC OIL IN THE FANS AND POWER STEERING?

Ready to replace all fluids with fresh since my radiator, coolers, intercooler , conundrum. The unit had ATF in the tank for the fans and power steering. Stay with a good brand ATF or change to Hydraulic Fluid?


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Old 04-20-2020, 11:08 AM   #2
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If it came with ATF, I'd stick with it.
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Old 04-20-2020, 12:19 PM   #3
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Quote:
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If it came with ATF, I'd stick with it.
Agreed! Stay with whatever was in it!
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Old 04-20-2020, 12:24 PM   #4
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….probably not much difference---both fluids are compatible, so ok to mix with the residual in the system--go with an AW46 hydraulic fluid....
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Old 04-20-2020, 12:33 PM   #5
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-both fluids are compatible,
You ever researched that?

I have. Everything I've read says don't mix the two!
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Old 04-20-2020, 01:26 PM   #6
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….my point was--you are going to have some minor "mixing" when you change fluids, unless you disconnect every hose and flush every component--who does that?
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Old 04-20-2020, 01:30 PM   #7
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That was my reason for suggesting he stick with what he has.
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Old 04-20-2020, 01:52 PM   #8
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I would guess this fluid is from factory. I have never changed it and I know my dad would never ,,,, just saying.
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Old 04-20-2020, 02:28 PM   #9
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Old 04-20-2020, 05:50 PM   #10
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Quote:
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I would guess this fluid is from factory. I have never changed it and I know my dad would never ,,,, just saying.

If was ATF originaly ?... I would stay with ATF

ATF is in most cases is a much more versatile fluid as in comparison to most hydraulic fluids.

ATF would be more like a synthetic as compared to AW46 hydraulic oil and that is reflected in the cost in most cases being that hydraulic oil is much cheaper than ATF

The working conditions your coach hydraulic system works in is by far less stressful than that and of what most automatic transmission go thru.

FYI... ATF prices come way down when purchased in 5 gallon containers.

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Old 04-20-2020, 09:01 PM   #11
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Joe, FWIW mine has AW46 in it - and has a big sticker on the top of the tank specifying AW46. if yours is like mine - there is no shutoff - so changing the filter needs to be done when the tank s empty...
I have read on iRV2 that the engine mounted pumps usually use AW46, and the transmission mounted pumps use ATF, for the possibility of contamination in the event of a pump seal failure.
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