Oil & Fuel 4120 Transmission & Front Axle Oil?

[8934]

I want to change the transmission & front axle oil in my 4120. According to JD online manual, it uses

Transmission Oil Low Viscosity HY-GARD (JDM J20D)
Transmission and Hydraulic System (PowrReverser Models) 38.9 L (10.3 gal)
Transmission and Hydraulic System (eHydro Models) 36.1 L (9.6 gal)


Front Axle Oil Low Viscosity HY-GARD (JDM J20D)
Front Axle 5.0 L (1.3 gal)

Two questions

1) On Amsoil site it lists two oils that meet spec ISO46 SAE 30, and ATH SAE 5-30, this seems to be a low viscosity esp for use in Florida, and in a front axle.

2) 1.3 Gal seems like a lot of fluid in the little front end, is this right?

Any thoughts?

Thank you
Glenn

 

[Spudland_Dave]

You asked for thoughts...here is my thoughts, grew up on a farm, been around tractors all my life, seen this first hand, most noticeably/recenly on a Kubtoa L Series GST...

Not saying Amsoil isnt good stuff...BUT, i'd run the Genuine JD Hy-Gard without a doubt....Not counting Engines, I'd run whatever the OEM Oil is on ANY piece of equipment in their transmissions...

 

[marco246]

8934,

The front axle of my 4610 takes 1.3 gallons of hydraulic oil, so that sounds about right for yours.

I don't know anything about Amsoil.

My manual recommends using either JD Low Viscosity HY-GARD or standard JD HY-GARD depending on the ambient air temperature. I use Chevron 1000 THF which meets the JDM J20C spec (that is, for standard HY-GARD) because it doesn't get cold here. I'd think you could safely use a J20C spec oil there in Florida unless your owner's manual recommended otherwise.

Cheers,
Mark

 

[8934]

Thanks for the feedback.

I cant check my manual since the dealer lost it.
They have one ordered, but I have not got it yet.

I got the data I posted from online manual, but 5-30 oil seemed light for a front end in Florida.