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Old 08-14-2012, 04:50 PM   #1
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National RV Owners Club
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Join Date: Sep 2007
Posts: 22
Hydraulic Fluid Reservoir

We have a 2005 Tropical LX on a Freightliner XC chassis with Cat C7. We just got back from a trip to Yosemite NP over the weekend. Temperatures have been hot in California lately, and the ambient air temperature through most parts of Central Cal. were over 100 degrees. Well, when we arrived at the park late last week, and I unloaded bikes, etc. from the rear of the coach, I noticed some fluid/oil had sprayed out onto the bikes. I checked and it appeared as though the hydraulic fluid had vented from the cap and sprayed out the back. While the coach was still warm, the hydraulic fluid was definitely up to the top of the reservoir. I checked the next day, after everything had cooled down, and the hydraulic fluid had settled down to its normal levels. On the way home, it did the same thing.

Is it normal for the fluid to expand that much with the heat? What would cause the fluid to vent out the cap and spray out the back? Looking for suggestions on what I should be looking for. Thanks for any help.

Rob S.
2005 National Tropical LX
Freightliner XC
Cat C7

2005 National Tropi-Cal LX
350 HP Cat/Freightliner
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Old 08-15-2012, 07:08 AM   #2
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Join Date: Apr 2011
Location: Northwest Indiana
Posts: 326
Was the fluid recently topped off during a service?
If so it could have been slightly overfilled causing the condition you're experiencing.
My Discovery spits a little oil out the blow by tube, are you positive it's the hydraulic fluid?
2004 Fleetwood Discovery 3126 CAT engine
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