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Old 08-06-2019, 07:14 PM   #1
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Rexhall Owners Group
Join Date: Dec 2009
Posts: 325
Hydraulic Radiator Replacement

I have a leak on my aluminum hydraulic radiator (2007 Patriot Thunder C13 Winchester). Replacement radiator on order from Source Engineering in Eugene OR. Replacement does not look very complicated only because this is the outermost radiator in the stack ie the first one you see looking in. Any helpful hints from people who have done this? Looks like I will drain as much fluid (mine is red Dexron III) as possible before breaking any fittings. 48 quarts if the specs are correct. I am not overly concerned about reusing the current fluid as the specs call for Texaco Rando HD46. Cant find the Texaco product looks like it will be Chevron equivalent. One end of the radiator line goes to the fan motor the other end to the hydraulic tank via filter. Suggestions on where to break the lines to create the least mess will be appreciated. With luck the replacement radiator will ship this Friday and take 5-6 days to reach me - then the fun starts.

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Old 08-06-2019, 09:37 PM   #2
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Monaco Owners Club
Join Date: Oct 2009
Location: Tucson, AZ
Posts: 3,608
I just rebuilt our hydraulic pump. Mine holds 14 gallons of Dexron III. I drained it into 5 gallon buckets. I bought new Dexron III from Walmart for $14.94 per gallon.

Distaff replaced his oil cooler and radiator last month. He has a 2006 Patriot Thunder.
Has anyone on here replaced a side radiator themselves?

97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV
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Old 08-06-2019, 09:44 PM   #3
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Holiday Rambler Owners Club
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Originally Posted by PandK View Post
Looks like I will drain as much fluid (mine is red Dexron III) as possible before breaking any fittings. 48 quarts if the specs are correct. I am not overly concerned about reusing the current fluid as the specs call for Texaco Rando HD46. Cant find the Texaco product looks like it will be Chevron equivalent.
Ah, another with wrong information in the owners manual!
Both my owners manual, and chassis manual say it was filled with Rando HD46. Sure looks like ATF to me !
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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Old 08-07-2019, 06:29 AM   #4
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Join Date: Jun 2011
Location: USA
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We replaced ours. It was a simple job, two hydraulic connections on the side of the radiator and a few bolts holding it in. Expect to find a lot of crap behind it to be cleaned out, we had junk, leaves, etc. Lots of Simple Green and water did the trick.
Bill B
2007 Navigator, Series 60
Full-Timing since 2004
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Old 08-07-2019, 06:43 AM   #5
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Join Date: Aug 2017
Location: Orlando, Florida
Posts: 4,090
I have not really looked closely at the radiator setup on my coach - but this thread got me thinking about it.

How many radiators are there - three or four (i.e. engine coolant, CAC, Transmission, and Hydraulic)? Not to mention the AC condenser which may be mounted to the radiator).

Is the Transmission Cooler separate from the Engine Radiator (or do they share the same housing)?

Picture from my Owners Manual (doesn't show engine coolant radiator and seems to suggest that the trans cooler is separate.
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Mike ----- 2005 Beaver Patriot Thunder CAT C13 525HP, 42-ft Tag, with HydraLift
**Beaver History/Info/Chassis/Suspsn https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
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Old 08-07-2019, 10:29 AM   #6
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This is funny. I just had a post about a leak in my oil cooler. I ordered a new one from Jim at Source, waited until it arrived to pull the old one, and when they were on the ground beside each other I realized that the new one was a mirror of the old one, and I couldn't use it.

Since it was the week of Independence day I couldn't reach Jim, and I needed to get on the road, I found a local shop that could cut out two rows of tubing in the old one and weld it off.

Jim was ticked off that I had the old one fixed, said he'd have authorized a shop to cut off the brackets and weld them on the other side. Too bad I told him, you were not open and I needed to act. How could I know that he wouldn't say "that voided the warranty"?

I shipped it back to him (he wouldn't cover my return shipping cost even though it was not at all my fault), and he said he would cut off the bracket and weld it on and sell it to the next guy.

Looks like you may be the "next guy".

To remove it just put a big pan under the low point and remove the small drain plug, then remove the top plug. After draining it, take the top hose off first and tie it up high. On my coach the bottom fitting didn't want to rotate on the hose end - it had corroded - so it was rotating the elbow fitting and the hose that turned back into the coach. I had to jack a piece of wood under the elbow to brace it and keep it from turning, then I could crack the fitting. Needed a 1 1/4 wrench, a big adjustable, and a snipe to get it to crack.

When you have the fittings off check them, my rear one coming from the filter had corrosion in the face and I had a new hose with fittings made to go from the filter to the cooler. My rear one was good.

I removed it alone, needed help to put it back in.

2006 Patriot Thunder C13 Allison 4000
2010 Ford Flex Ecoboost AWD
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ace, hydraulic, radiator, replace, replacement

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