Hydraulic oil

(quoted from post at 05:48:15 04/11/17) Interesting that they actually mention it's suitable for a Jerk O Matic.
I'm impressed.

Click to expand...

(quoted from post at 15:37:29 04/11/17) Subject: Re: Hydraulic oil
Email:
Name: jturn36178
Date: April 11, 2017 at 07:24:59
N series hyd fluid special is:
original oil was a--before G5-- 80w90 gear oil. In simple terms was just two base oils with no or little non-corrosive additives.

the originals rear end, transmision, hydralic oils did not have Extreme pressure additive (EP) Which is zinc and phosphorus etc. components. these zinc phos. components were corrosive to the soft brass used in the hydraulic pump assys. Almost all the old fergusons and MF through the early '70 have such components.

Newer hyd. systems have gear/piston pumps that do not have brass components.

Mfg. have approved their use in MF etc. since the 70's, but in their estimations the pitting etc. caused by the EP additives were negligable. Therefore The G-1 through G-3 oils are more difficult to find now days, so almost all end up using products that have EP additives.

Almost all the current hyd. oils are now multi-viscosity oils such as 5w30 etc. That means they are actually made from a 5 weight oil with viscosity improvers that as the temp increses the product at the molecular level begins a "chaining" together to take up more space at the molecular level, that in theory prevents the metal to metal contact.

These "thinner" oils: Will work with the older tractors but depending on the wear of all components they may cause slow operations or loss of lifting power, due to bypass of worn parts. they will protect the metal to metal contact that would cause damage, but they usually (depending on the wear in system) cause unsatisfactorily effects in the hyd. system.

Hope this answers your concerns without being too technical.
Jim

Click to expand...

• [*:dfdae2a32a]From the git-go the Ford recommendation for these tractors was mild EP gear oil - grades SAE 80 or SAE 90. [*:dfdae2a32a] A modern Universal Transmssion Fluid like the one pictured generally has a viscosity of 9.5 to 10.5 cSt @ 100C which is right smack dab in the middle of grade SAE 80 gear oil. That also happens to be smack dab in the middle of grade SAE 30 engine oil[*:dfdae2a32a]For the last 50+ years the primary EP additives in automotive gear oils have been chlorine and sulfur-phosphorus compounds both of which were reactive with yellow metals[*:dfdae2a32a]Chlorine has been gone for several decades (environmental concerns) and the industry has moved to inactive/buffered sulfur compounds to greatly reduce yellow metal reactivity[*:dfdae2a32a]An N-series tractor contains nothing that would be in danger from the EP additives in a modern GL-5 gear oil.[/list:dfdae2a32a]Hope this answers your concerns without being too technical. For a more technical and exhaustive discussion try this:
  
  [u:dfdae2a32a]More than most people probably want to know[/u:dfdae2a32a]
  
  TOH