HG/OC3 Gear box oil.

[kiwiHG]

Hi everyone.

Can anyone out there tell me what sort of oil I should use in my HG gearbox and what the procedure for draining and refilling it is?

Thanks in advance.

[ObsoElitist]

My HG manual calls for 140 weight straight mineral oil. This is NOT the hypoid gear oil you will find easy to get. My OC3 manual calls or 90 weight straight mineral oil or 50 weight non-detergent motor oil.

[kiwiHG]

Great thanks ObsoElitist.

Any indication of how much?
I gather that the fill point is on the Left hand of the transmission by the clutch pedal.

[Lowspeedlife]

Zimmermans sell GL1 90 weight mineral for both the HG & OC3 gearboxes. I get mine from NAPA. Part number 65205, that is a 5 gallon pail for $52 & change. With Virginia sales tax it was just over $55.00. 1 gallon jugs are part number 65201, the website says $17.10 for the price but I think that it is likely cheaper because the website lists the 5 gallon pail I paid $52.00 for, at $81.00.


Scott R.

[kiwiHG]

Great.

Thanks for your help guys.

[oliverchris]

Here's some transmission lube research I did not so long ago: https://goo.gl/NRofvK

[Blake Malkamaki]

For Cletrac transmissions, be sure NOT to use any lubricants with "hypoid" or extreme pressure additives as they can effect steering brake performance, and can possibly be detrimental to bronze bushings or parts within the transmission and final drives of the tractor.

As far as detergent vs non-detergen in the transmissions, the book recommends non-detergent. But, personally I have had 50 wt detergent engine oil in the transmission on my 1936 E for about 30 years and it's never given me any trouble whatsoever. Steers almost effortlessly.

Blake

[Lowspeedlife]

Non-detergent oils were used before engines were fitted with oil filters, after a period of time/miles you would drop the oil pan & clean out the gunk from the sump. You need to use a non-detergent oil when you don't want the wear particles floating around to get into bearing surfaces. Roller & ball bearings are much more forgiving in this regard than shell type or babbit lined bearings. If your transmission sump is clean I would see no problem using detergent type oil in it. On the other hand if it has gunk in the bottom of it, a detergent type oil would likely allow this gunk to be stirred up & suspended in the oil, allowing it to float thru the moving bearings. This is what the detergent additives do, suspend the particles so they can be filtered out. So the way I see it ; clean sump - detergent is ok. Dirty sump - stick with non-detergent.

Scott R.

[Dustdvl]

What about tractor supply they have a 90 weight mineral oil it said for old ford tractors

[ObsoElitist]

Cheap stuff, but it is the grade called for in an OC4. And easier to find than W50 non detergent engine oil. Getting 140  mineral oil for my HG was as easy as calling the county's only petroleum dealer and picking it up.

[Lowspeedlife]

As long as it is API GL1 90 weight mineral oil it is acceptable

Scott