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Old 07-18-2011, 11:17 AM   #1
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Hyd Fluid at rear of coach

Does anyone know what kind of hyd oil goes in the engine compartment? We are in Canada on our way to Alaska with another Alpine and his oil is low from the hyd fan on radiator. It's a small leak at a fitting. He has tried to get it fixed but no one wants to touch it because they are so busy. He will try again in Fairbanks but he needs to add oil now.

2008 Alpine 40FDQS Limited SE
2006 Jeep Wrangler Unlimited 2D 4X4
2014 Buick Enclave
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Old 07-18-2011, 11:32 AM   #2
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My coach has 10W-40 engine oil in the canister.

2005 38FDTS
2011 Ford Edge
Fredericksburg, TX
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Old 07-18-2011, 11:56 AM   #3
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Not engine oil. Hyd oil for the radiator fan.
2008 Alpine 40FDQS Limited SE
2006 Jeep Wrangler Unlimited 2D 4X4
2014 Buick Enclave
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Old 07-18-2011, 12:13 PM   #4
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Don't know if it will help but when we had our radiator/charge air cooler replaced at Mac's Radiator in Portland, OR they added something called AW46 Hydr Fluid. You could call them at 503-777-4706 as a last resort and perhaps they could give you better information.
Gary & Betsy Sinclair
2005 36' Alpine Limited
Lake Chelan, WA
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Old 07-18-2011, 12:19 PM   #5
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Alpine Road
I have a 2005 Fleetwood Revolution and the Canister for the oil at the rear of the coach calls for {ISO viscosity grade 46 Anti wear hydraulic oil} The coach has a C-7 Caterpillar engine.
I hope this helps
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Old 07-18-2011, 02:22 PM   #6
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OK--here is the deal.....2004 and earlier Alpines had ATF [Automatic Trans fluid]--the older ATF kind/not the ATF III, IV or VI]. Post 2004, WRV used regular engine oil [15w40]. Dont know about the last few build years? Owners complained about poor braking when using 15w40 [yes--this reservoir services engine fan, brakes and steering] so WRV recommended an exotic hydraulic fluid with a viscosity of 46???? [do a search on this forum for a long dicussion]. So--depending on what year your friends coach is, it may have ATF or 15w40 or exotic 46 fluid in it. 15w40 will be obvious but ATF and "Exotic 46" will probably have similar [red tint]. good luck.....
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2003 40' MDTS
Garden Ridge, Texas
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Old 07-18-2011, 06:00 PM   #7
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We live close to Fairbanks and have a 2003 Alpine. The 46 Hyd fluid can be bought at Sam's Club here in Fairbanks. If not a member and want to use that hyd oil give me a call and I'll get you 5 gallons.

I have used that in a back hoe but prefer the John Deere required oil.

My present Hyd oil is chevron AWS ISO 32 and it works pretty well. Phone # 907 488 4554. We may be outside working but leave a message. Mike E.
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Old 07-18-2011, 07:39 PM   #8
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If you only need to top off till proper service can be had, you can add just about any automotive type oil. As stated earlier, WRV used ATF, then the same Valvoline Blue engine oil they filled the Cummins with. Some time in the late 08 model year they switched to a dedicated hydraulic oil (which is the same stuff in your 2008 HWH reservoir).
In researching options to improve braking (same fluid courses thru the steering gear then thru the Bosch HydroMax brake booster/master cylinder) they tried all sorts of stuff, settling on the fluid they wer buying in bulk for HWH application, as they seemed to get some braking improvement from switching to that.

However, a) you can add whatever is handy or as close to OEM as you can when topping off, and b) the hydraulic fittings are simple wrench adjustment gizmos. If you have wrenches large enough it takes two wrenches (crescent type) to turn fitting parts in opposite directions to tighten. If it won't budge, so go all Schwartznegger on it, but it takes some muscle. The fittings are steel-on-steel beveled fittings & seal w/torque-pressure.

Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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