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Tractor Talk Discussion Forum

transmission fluid vs hydraulic fluid

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will w

07-28-2005 14:50:43

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I recently purchased a rebuilt power steering pump for my 63 ford 4000 gas tractor. Paperwork with the pump recomended using ford automatic transmission fluid but my ford manual suggests hydraulic fluid. Is there a difference and if so which would be best? Thank you

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txgrn

07-29-2005 05:16:36

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Re: transmission fluid vs hydraulic fluid in reply to will w, 07-28-2005 14:50:43

My manual for a 4600 says Ford M2c41 or Type F Auto tranny fluid.

Mark

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dej(JED)

07-29-2005 05:07:29

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Re: transmission fluid vs hydraulic fluid in reply to will w, 07-28-2005 14:50:43

Speaking from a Chemistry point of view. The ISO 32 hydraulic oils are very much like ATF.
The ATF's are chemically engineered to contain very small sized additives, because the transmission systems use servbo valves that are tiny, <5 micron. All in all I don't see why they won't interchange.

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txgrn

07-30-2005 06:15:01

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Re: transmission fluid vs hydraulic fluid in reply to dej(JED), 07-29-2005 05:07:29

I like your answer. Mechanisms!!!! Love em. You explored the mechanism as to why not and the answer was ok so you didn't object.

I think it is so gratifying to sit down and understand (attempt to) something broken, then go through the steps and upon finding the thing that doesn't support the mechanism having found what needed to be fixed.....and most of all why! And maybe going a bit farther and incorporating a fix to prevent it from occurring again.

Mark

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RayP(MI)

07-28-2005 18:45:55

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Re: transmission fluid vs hydraulic fluid in reply to will w, 07-28-2005 14:50:43

My electric/hydraulic pump for my snowplow recommends Dextron for fluid. Seems to work fine in that application. Pump is the critical member in a hydraulic system. Would use what current manufacturer recommends.

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old

07-28-2005 15:23:08

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Re: transmission fluid vs hydraulic fluid in reply to will w, 07-28-2005 14:50:43

I have a ford 801 and I have tried both. the hyd fluid didn't work very well and the tranny fluid works great. So I would say use the tranny fluid.

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Will W

07-29-2005 15:10:52

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Re: transmission fluid vs hydraulic fluid in reply to old, 07-28-2005 15:23:08

Thanks guys - transmission fluid it is.

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mike brown

07-28-2005 15:22:08

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Re: transmission fluid vs hydraulic fluid in reply to will w, 07-28-2005 14:50:43

My gut sense is to use the pump instructions rather than the forty odd year old recomendations in the owners manual. These fluids have changed a lot in forty years, especially in the area of synthetics and additives. The oil recomendations for my 1960 JD 730D call for thirty weight in summer and twenty in winter. I use shell rotella muti-viscosity year round.
To be sure call the pump place or Ford dealer.

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txgrn

07-30-2005 06:21:52

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Re: transmission fluid vs hydraulic fluid in reply to mike brown, 07-28-2005 15:22:08

Agree on using some common sense with using today's lubricants. They are so advanced as to compared to 40 years ago.

I remember when single grade was all you could get. We would go thru a set of valves in 45,000 miles and an engine overhaul in 75,000. Chassis lube was 1000 miles.

Today folks on here boast of 250,000 " and still going strong" and some chassis points (my dodge ball joints for example) are permanently sealed.

An then there were the brakes I used to have to adjust every couple of weeks and could never get them even so that when you stopped you could have your hand off the wheel and it would track straight.

Today, with disc brakes on all 4 you never have to adjust them. Rear drums with self adjusters were about that good too.

Whadda deal.

Mark

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