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#1842957 - 04/02/10 08:38 PM substitute for marine steering oil
mjbll Offline


Registered: 04/02/10
Posts: 3
Loc: La
I was wondering is there a good substitute for $20 a quart marine hydraulic steering fluid.I just bought a boat and the owner has been using transmission fluid.The steering manufacturer and my boat dealer says to use trans fluid only in an emergency.The fluid calls for MIL spec H5606C.Is there a fluid that meets this spec other than $20/qt "marine"oil/fluid?

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#1842968 - 04/02/10 08:43 PM Re: substitute for marine steering oil [Re: mjbll]
Johnny248 Offline


Registered: 07/19/09
Posts: 2013
Loc: Detroit, MI
I use ATF in by steering and have never had a problem. My boat is a 1995.
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#1842991 - 04/02/10 09:00 PM Re: substitute for marine steering oil [Re: Johnny248]
oilboy123 Offline


Registered: 12/05/03
Posts: 6912
Loc: Everett, Washington
I am installing a system for my outboard that uses this expensive fluid. I would think there would be something compatible, but they scare you away from that line of thinking.
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#1843648 - 04/03/10 02:42 PM Re: substitute for marine steering oil [Re: oilboy123]
oilboy123 Offline


Registered: 12/05/03
Posts: 6912
Loc: Everett, Washington
Might try a boat forum.......
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#1843696 - 04/03/10 03:39 PM Re: substitute for marine steering oil [Re: oilboy123]
ac_tc Offline


Registered: 05/06/08
Posts: 597
Loc: sweden
any atf, thf, stou, ps- fluid or iso vg 32-46 hydraulic oil.
This is a low stress usage any way, but change
the oil sometimes.
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-98 Dodge Durango 5.9 4*4 HDEO 10w- 40 ci4
-04 PT Cruser GT 10w- 40 HDEO ci4
-Everything else HDEO 10w- 40 ci4/STOU 10w-30/THF

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#1843760 - 04/03/10 04:44 PM Re: substitute for marine steering oil [Re: ac_tc]
mjbll Offline


Registered: 04/02/10
Posts: 3
Loc: La
What is iso vg 32-46 hydraulic oil.What about aw32 hydraulic oil?Its in auto parts stores and is cheap.

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#1844818 - 04/04/10 03:32 PM Re: substitute for marine steering oil [Re: mjbll]
ac_tc Offline


Registered: 05/06/08
Posts: 597
Loc: sweden
Just plain hydraulic fluid.
its what every escavator or wheelloader use typically..
for thousands of hours moving dirt and soil. That´s a much higher
load than your steering will ever see.
-But, hydraulic oils doesent mix with water so id go for a
THF (universal tractor tranny fluid) wich has some mixing ability. And change the stuff now and then- its cheap.
If you use hydraulic fluid, check for water..try to heat a sample and se if it forms bubbles, if so change.
_________________________
-98 Dodge Durango 5.9 4*4 HDEO 10w- 40 ci4
-04 PT Cruser GT 10w- 40 HDEO ci4
-Everything else HDEO 10w- 40 ci4/STOU 10w-30/THF

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#1850175 - 04/08/10 09:26 PM Re: substitute for marine steering oil [Re: ac_tc]
ledslinger Offline


Registered: 06/21/09
Posts: 1078
Loc: Missouri
My buddy picked up two gallons of Royco 756 at the local airport for $28/gal. It is Mil-PRF-5606 which supercedes Mil-5606. You can buy it at an airport or online.

The link for the data sheet on Royco 756 didn't work. Just google it.

Here is some more Tele/Seastar info:
http://ww2.seastarsteering.com/PWR_STEER/power.htm

Here is a link to a bunch of PDF on Seastar steering. Install, maintenence etc.

http://ww2.seastarsteering.com/PDFs/PDF_files.htm

I'll try to find the new number for the filter. I am going to try to buy one at Jerry's Marine. They list it but out of stock.

The old filter # is 821723, superceded by HP6140.

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#1850207 - 04/08/10 09:47 PM Re: substitute for marine steering oil [Re: ledslinger]
ledslinger Offline


Registered: 06/21/09
Posts: 1078
Loc: Missouri
That filter information only applies if you have a big boat with a system that requires 2 gallons.

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#1947406 - 07/09/10 06:00 AM Re: substitute for marine steering oil [Re: mjbll]
NesloOne Offline


Registered: 07/06/10
Posts: 7
Loc: Denmark
Go only for the original requested steering oil, as too dangerous to use any others unless you by chance what to enter into emergency situation ?
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#2098303 - 12/07/10 10:03 AM Re: substitute for marine steering oil [Re: NesloOne]
abycat Offline


Registered: 12/06/10
Posts: 1931
Loc: grande prairie AB
I bet the reason that stuff is so expensive is because it is biodegradable. Wont kill the fish if it leaks into the water.
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