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Old 07-30-2013, 08:51 PM   #1
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DGBPokes's Avatar
Newmar Owners Club
Workhorse Chassis Owner
Spartan Chassis
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HWH Leveling jacks. Should fluid be changed?

I periodically change the transmission fluid as recommended. I have had the brake fluid changed. Never thought about the HWH fluid. I think it is a transmission/hydraulic fluid. If so is it not subject to water absorption like other hydraulic fluids?? I don't recall seeing a drain plug, and bleed points on the hoses or levelers. Could be a difficult job to flush and replace. Any experience or recommendations on this subject?

2007 Newmar KSDP. 3912
2010 Nissan Frontier SE
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Old 07-30-2013, 09:38 PM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 11,954
A great question, nothing specific in my owners manual about a change, and as you say a system flush would be a bear. System on my 99 says ATF, so color could be best indicator. I imagine that because of the limited use and exposure to heat the fluid would not really break down, but contaminants could be an issue , because the tank is vented.
Guess you just put an item on my ,to be checked list.
I'm off to the HWH, web page.
Web page under FAQ, says only if contaminated.
If there is any water in the system it will be milky after use, so if you level then retract, check the fluid for anything but clear. From what I read online newer systems use a hydraulic fluid .

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 07-30-2013, 10:47 PM   #3
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HWH jacks for everyone
HWH has their own clear fluid but most systems I have seen have the ATF red fluid.
I have never drain the system there are plugs at base of cylinders but your going to possible place air pockets in system when refilling..
I see nothing in this Manual requiring a complete fluid change just keep fluid to correct level between lines on bell vent shaft, with all jacks retracted and making sure all grounds are good for solenoids and motor mountings.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
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Old 07-31-2013, 05:32 AM   #4
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Join Date: May 2008
Location: Hornby, On.
Posts: 67
I've just had all 4 of my jack cylinders rebuilt at a local hydraulic cylinder shop. The tech said they were pretty mucky inside and that he spent quite a long time cleaning out the junk. When I got the cylinders back on I pumped out what fluid I could get with a siphon pump and replaced the fluid with dexron III. The fluid that came out was neither red not clear, but slightly red/brown. Since I am not the original owner, I have no idea what has gone on before I owned the coach. The HWH system on my coach is not a sealed system, so it would be possible to get contaminants into the fluid. Also since it is not sealed, air in the system is not a problem. By the way the jacks are working flawlessly.
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