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Old 02-23-2015, 04:30 PM   #15
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Check out ACA Technical section for procedure. Here's a link for the "How To."

2006 Alpine 36' FDTS
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Old 02-23-2015, 04:52 PM   #16
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What is the advantage of switching from the OE fluid to another type of fluid for the engine-driven hydraulics.

Looks like three different fluids were used from the factory over the years:

Engine oil
Dexron III
ISO 46 Hydraulic

In our case (2003) Dexron III was the OE fluid. I just changed fluid and filters and went back with Dexron.

What "works better" with one of the other fluids in a system designed for Dexron III?

Clearly, there is a viscosity difference, so I am wondering if the system was designed for one fluid, there should be some differences when going to a fluid with different viscosity.

2003 Alpine 38'

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Old 02-23-2015, 06:40 PM   #17
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Ref my earlier note--this was one of several "recommended" solutions to cure/improve brake pedal pressure on the 2004 and newer coaches that employed the adjustable brake pedals. Thought was that changing out the 15w-40 for hyd fluid would improve pedal feel.
PS--the surest way I know of to get hydraulic hoses to leaking is to disconnect them. Rather than disconnecting and "blowing-out" the lines [opportunity for getting debris in lines], I'd advocate changing out the fluid in the reservoir and calling it good enough, swap it out a 2nd time if you like. Most petro-based fluids are pretty mixable; besides, if this process is good enough for the Allison conversion to Transynd, it's probably good enough for our hydraulics--IMHO.

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2003 40' MDTS
Garden Ridge, Texas
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