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Old 05-21-2018, 02:26 PM   #1
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Changing Hydraulic System Oil

I changed the hydraulic oil over the weekend. Our coach uses 50-55 quarts (12.5-13.75 gal) of Dexron III and a Parker IN HC 5720 (10 micron) filter. The filter is located very low just behind the engine and in front of the trailer hitch, so it’s a perfect place to drain the system.

I purchased 12 gallons of Dexron III from Walmart for $12.15 per gallon. I checked around and with shipping, this was the least expensive I could find.
I ran the engine and used the air ride system to raise the coach all the way up on the air bags. I was then able to fit a 5 gal bucket under the filter. I loosened the filter approx 2 turns and let the fluid run out into the bucket. Make sure you have a large filter wrench as this is a large diameter filter.

The trick here is not to remove the filter until you are done draining the system. When the 5 gal bucket is near full, tighten the filter back onto the housing to stop the flow. Change the bucket out and loosen the filter again. I used three 5 gal buckets and drained about 12 gal of fluid. After the fluid was done draining I then removed the old filter. The new filter came with two rubber gaskets. My system used the smaller gasket. Be careful here as the gasket stays on the filter housing, not on the filter. I removed the old gasket from the housing and lubed the new gasket with Dexron and pressed it into the groove then reinstalled the new filter. Tighten it ĺ turn after the gasket makes contact.

Then I had to pour 12 gal of fluid back in through a fairly small opening that my funnel would not fit. I ran the engine again and then rechecked the fluid level. Overall this was much easier than I expected.
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Old 05-21-2018, 03:11 PM   #2
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Quote:
Originally Posted by vito.a View Post
I changed the hydraulic oil over the weekend. Our coach uses 50-55 quarts (12.5-13.75 gal) of Dexron III and a Parker IN HC 5720 (10 micron) filter. The filter is located very low just behind the engine and in front of the trailer hitch, so itís a perfect place to drain the system.

I purchased 12 gallons of Dexron III from Walmart for $12.15 per gallon. I checked around and with shipping, this was the least expensive I could find.
I ran the engine and used the air ride system to raise the coach all the way up on the air bags. I was then able to fit a 5 gal bucket under the filter. I loosened the filter approx 2 turns and let the fluid run out into the bucket. Make sure you have a large filter wrench as this is a large diameter filter.

The trick here is not to remove the filter until you are done draining the system. When the 5 gal bucket is near full, tighten the filter back onto the housing to stop the flow. Change the bucket out and loosen the filter again. I used three 5 gal buckets and drained about 12 gal of fluid. After the fluid was done draining I then removed the old filter. The new filter came with two rubber gaskets. My system used the smaller gasket. Be careful here as the gasket stays on the filter housing, not on the filter. I removed the old gasket from the housing and lubed the new gasket with Dexron and pressed it into the groove then reinstalled the new filter. Tighten it ĺ turn after the gasket makes contact.

Then I had to pour 12 gal of fluid back in through a fairly small opening that my funnel would not fit. I ran the engine again and then rechecked the fluid level. Overall this was much easier than I expected.


Vito good write up, think my 08 ISL might be a little different it used AW46. I have one spin filter, and a internal filter in reservoir.
Did you cycle your steering to purge through guild and remove air, or do you not need to do that step?
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Old 05-21-2018, 06:25 PM   #3
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Why not install an in-line shut off so next filter change will be less messy and time consuming? Is the line from your reservoir to filter 1-1/2"?
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Old 05-22-2018, 08:49 AM   #4
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Perry, I haven't checked the steering. I don't think it will be a problem.

Mike, I just don't think the shut off is necessary. The oil runs down the rear half of the filter and I used a blue paper towel over my hand to spin the filter back and forth. It was very easy this way.
How often should the hydraulic oil be changed?
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Old 05-22-2018, 09:46 AM   #5
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How often should the hydraulic oil be changed?
Good point.
Probably once in the life of the coach - however the manual states "filter and fluid change should be done every 12 months or 15,000 miles".
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Old 05-23-2018, 05:34 AM   #6
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I am going to change ours before our big trip later this year. All I have is the internal filter. Also there is no drain plug. Gonna have to crack a line and let it seep out....lol. The city is gonna think I am working as a mechanic out of our home....lol.
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