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#529324 - 04/09/05 09:49 AM Mil spec H5606?
jeremiah2360 Offline


Registered: 10/06/03
Posts: 223
Loc: Massachusetts
SeaStar hydraulic fluid is very expensive. Their web site says only to use H5606 Mil spec fluid. Are there any fluids that meet that spec readily available(and cheaper)?

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#529325 - 04/19/05 04:38 AM Re: Mil spec H5606?
jeremiah2360 Offline


Registered: 10/06/03
Posts: 223
Loc: Massachusetts
Noticed this list of acceptable fluids on their "fill and purge" instructions;

Texaco HO15
Shell Aero 4
Esso Univis N15
Chevron Aviation Fluid A
Mobil Aero HFA

For convenience I ended up using two of their $15.00 a quart fluid to purge my hydraulic steering [Mad]

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#529326 - 04/25/05 09:52 AM Re: Mil spec H5606?
MolaKule Offline


Registered: 06/05/02
Posts: 14644
Loc: Midwest
What is your application, vehicle, machine, etc?

We're not into crystal ball gazering!

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#529327 - 04/25/05 03:57 AM Re: Mil spec H5606?
jeremiah2360 Offline


Registered: 10/06/03
Posts: 223
Loc: Massachusetts
Sorry MolaKule(et al), it`s for the hydraulic steering in my 20` boat. More detail in the following link(it`s a single station):

http://www.seastarsteering.com/PDFs/200017-B.pdf

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#529328 - 04/25/05 08:41 AM Re: Mil spec H5606?
MolaKule Offline


Registered: 06/05/02
Posts: 14644
Loc: Midwest
I believe this is similar to Skydrol, a phosphate ester fluid for aircraft hydraulic systems.

The only reason I think they are requiring this is for fire safety, since Skydrol is less flammable.

Will do some more checking.

It isn't going to be cheap, which is why you paid $15 per quart.

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#529329 - 04/26/05 09:24 AM Re: Mil spec H5606?
DH Offline


Registered: 12/11/02
Posts: 10
Loc: NJ
H5606 is mineral oil based.
H83232 is PAO based.
PEs don't have a number.

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#529330 - 04/26/05 08:26 PM Re: Mil spec H5606?
MolaKule Offline


Registered: 06/05/02
Posts: 14644
Loc: Midwest
MIL-PRF-5606, formerly known as MIL-H-5606, MIL-O-5606, and a couple of other numbers, is a mineral based hydraulic fluid.

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#529331 - 04/27/05 01:44 AM Re: Mil spec H5606?
jeremiah2360 Offline


Registered: 10/06/03
Posts: 223
Loc: Massachusetts
MolaKule could I use Amsoil universal ATF. It`s an outboard motor so any leak won`t end up on any hot exhaust manifolds or anything. Appreciate your looking into this, thank you [HAIL 2 U!]

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#529332 - 04/28/05 03:21 AM Re: Mil spec H5606?
MolaKule Offline


Registered: 06/05/02
Posts: 14644
Loc: Midwest
What's the viscosity of this fluid. Thicker or thinner than ATF?

I don't have the specs that tell what vis the H5606 might be.

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#529333 - 04/28/05 04:05 AM Re: Mil spec H5606?
jeremiah2360 Offline


Registered: 10/06/03
Posts: 223
Loc: Massachusetts
I`d assume it`s viscosity would be about the same as Mobil's acceptable substitute which is as follows:

Kinematic Viscosity, cSt
@ 205C -
@ 100C 5.1
@ 40C 13.9
@ -40C 460 (500 max)
@ -54C 1950
@130F 10.7 (10.0 min)
Viscosity Index 370

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#529334 - 04/28/05 05:43 AM Re: Mil spec H5606?
jeremiah2360 Offline


Registered: 10/06/03
Posts: 223
Loc: Massachusetts
I found Amsoil`s Shock Therapy Suspension Fluid to be closer than the universal trans fluid in regard to viscosity. The Shock Therapy has seal conditioners and I think an anti-foam add(one test measures percent foam). Would it be better than the trans fluid? [I dont know]

Shock Therapy:

Kinematic Viscosity @ 100C, cSt (ASTM D-445) 4.38

Kinematic Viscosity @ 40C, cSt (ASTM D-445) 15.68

Viscosity Index (ASTM D-2270) 210

Pour Point, C (ASTM D-92) -54

Flash Point, C [F] 175 [347]

Fire Point, C [F] 192 [378]

Four Ball Wear Test (ASTM D-4172: 40kg, 75C, 1200 rpm, 1 hr) Scar Diameter, mm 0.40

Foam, ml (ASTM D-892) Sequence I, II, III 65/0, 60/0, 65/0

Blender Test (25C, low speed, 1 min.) 2.5 mins to settle, 8% foam

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#529335 - 04/28/05 05:48 AM Re: Mil spec H5606?
jeremiah2360 Offline


Registered: 10/06/03
Posts: 223
Loc: Massachusetts
OOPS, the above Shock Therapy specs listed are for #5 light. The only other is #10 medium. The medium is closer to the trans fluid specs. Didn`t notice there were two kinds [Roll Eyes]

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#529336 - 05/06/05 09:34 AM Re: Mil spec H5606?
Lance Offline


Registered: 07/30/02
Posts: 145
Loc: Austin, TX
If you choose Skydrol, read the MSDS. Also, protect your skin and eyes. It burns like fire on tougher skin, (hands),so use your imagination to guess what it will feel like on more tender, sensitive areas. Wash up good before you "answer the call". We use it in our regional jets' central hydraulic systems. The same jet still uses 5606 in the landing gear struts, though.

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#529337 - 05/22/05 10:33 PM Re: Mil spec H5606?
widman Offline


Registered: 05/27/02
Posts: 3071
Loc: Bolivia
Often the 5606 spec is used for reasons of convenience.
a 5606 fluid is about 15 cSt at 40
IV around 150
and high insulation value (I think around 35)
It's used in a lot of bucket trucks, but they then allow a diffence for tropical areas, where we they will take a good multigrade hidraulic with the high dielectric strengh. We've used Chevron's Rykon Premium 32 in tropical climates.

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#529338 - 05/22/05 11:12 PM Re: Mil spec H5606?
XS650 Offline



Registered: 12/21/03
Posts: 12385
Loc: Northern CA
MIL_PRF_5606H info directly from the spec. No need to SPECulate [Big Grin]

MIL-PRF-5606H

Viscosity in centistokes at -54C (max) 2500
Viscosity in centistokes at -40C (max) 600
Viscosity in centistokes at 40C (min) 13.2
Viscosity in centistokes at 100C (min) 4.90

I have the entire spec in .pdf. It's only about 550k in size. If someone wants to host it online for the benefit of the group, I will email it to them.

I someone wants to set up a space to host lube related MIL specs for the use of BITOGgers, I believe I can get any of them in .pdf.

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