John Deere 750 hydraulic issues

[California]

Deere's J20C (or equivalent) UTF, Universal Tractor Fluid, is likely what your Operator Manual recommends. But what you have should be ok for light work. UTF has additional additives for the high stress contacts between transmission gears for example.

As Wiinston noted, when Maveric finds your post he can likely explain in more detail.

 

[bmaverick]

NAPA Hydraulic Fluid, Agricultural, SAE 20W, 5 Gal. I changed it about 3 months ago but it has not been used ​

Oh no in a big way.

NAPA and others are now in class action lawsuits due to inferior Ag hydraulic fluid. Many tractors have either failed or are broken from using the fluid.

It's very possible your high pressure is from this fluid.

NAPA, Warren, Carquest, Coastal, Lubriguard tractor hydraulic fluid $10.85M class action settlement

A $10.85 million settlement resolves claims certain tractor hydraulic fluid, including Napa, doesn’t meet required specifications.

topclassactions.com

NAPA 303 Tractor Fluid Oil Class Action | Emerson Firm, PLLC

Is NAPA 303 Oil ruining your farm equipment? NAPA 303 tractor oil products may be ruining your farm or heavy duty equipment. Some retailers selling the 303 products may be using deceptive and misleading labeling tactics to get buyers to believe that the product is made to prevent wear and tear...

www.emersonfirm.com

LEGAL NOTICE: Notice of Proposed Class Action Settlement By RG/2

/PRNewswire/ -- READ THIS NOTICE CAREFULLY. YOUR LEGAL RIGHTS MAY BE AFFECTED WHETHER YOU ACT OR DO NOT ACT. If you purchased NAPA Quality Tractor Hydraulic &...

www.prnewswire.com

PHILADELPHIA, Aug. 25, 2022 /PRNewswire/ --

READ THIS NOTICE CAREFULLY. YOUR LEGAL RIGHTS MAY BE AFFECTED WHETHER YOU ACT OR DO NOT ACT.

If you purchased NAPA Quality Tractor Hydraulic & Transmission Fluid, Warren 303 Tractor Fluid, Carquest 303 Tractor Hydraulic Fluid, Coastal 303 Tractor Fluid and/or Lubriguard Tractor Hydraulic and Transmission Oil between July 26, 2014 and the present, a Class Action Settlement Could Affect Your Rights.

The purpose of this notice is to inform you that a $10,850,000.00 class-action settlement (the "Proposed Settlement") has been reached with the Defendants in a lawsuit regarding the sale and use of NAPA Quality Tractor Hydraulic & Transmission Fluid, Warren 303 Tractor Fluid, Carquest 303 Tractor Hydraulic Fluid, Coastal 303 Tractor Fluid and/or Lubriguard Tractor Hydraulic and Transmission Oil (Warren THF Products) in the United States and/or its territories, at any point in time from July 26, 2014.

BY ORDER OF U.S. DISTRICT COURT

A federal court authorized this notice. This is not a lawyer's solicitation.

 

[bmaverick]

NAPA Hydraulic Fluid, Agricultural, SAE 20W, 5 Gal. I changed it about 3 months ago but it has not been used ​

Do a complete hydraulic drain, clean the filter (if reusable) or change the filter, flush the entire system with fresh clean diesel, and then only buy J20C to refill that meets specification, NEVER compatible with J20C ! Caterpillar TO-02 and Yanmar TF500 or TF500A are the J20C fluid too.

I'm super happy you took notice of this before things BROKE ! Glad you parked the machine. You are ahead of the game.