Are you using John Deere HyGuard oil?

 

I would have to think it's a suction side leak but I have no literature of your tractor to analyze.
Possibly if you have had remote valves installed the "return to tank" pipe or passage is dumping above the hydraulic fluid level and creating the aeration.

 

Welcome Shannon.
How many hours on the tractor and has the fluid always been in good condition, being changed regularly? This recent change showed no improvement so it is not a fluid issue. How far away is your John Deere Dealer? You might give them a call since they may have some inside knowledge of your model that the local guy may not know. Sorry I'm not much help.

 

Consider the issue. Oil foaming ... ie air is being whipped into the oil. stop the air intake, stop the foaming. Jeff B's post is good advice.

 

Yes, you are sucking in air from somewhere or the oil is low. I know hydraulics well and foaming oil is an air leak or just plain oil level too low in a reservoir tank.

 

Tractor has 4100 hours on it, oil is not john deere.

Hydraulic Oil changed every 750 hours. "Dump valve" is above oil level but has never presented as a problem as its been the same setup from the get go.

The vineyard I'm working for does not have a huge budget to fix this hence why I would like to locate suction side of hydraulic pump clean well and check for any leaks or damage. Nearest dealership is 150km

 

Thanks for the input guys, diagnosed it myself without mechanic. It turns out the heat exchanger on the spray cart was shot and contaminating oil to the point it was more water than oil.

Method of diagnosis:

Tractor JD 6230PREMIUM

Spray cart CROPLANDS QUANTUM MIST 2500 TWIN ROW

Cleaned under tractor and whole spray cart then found loose fitting so tightened. Found fitting on spray cart with hairline fracture and replaced.
Was sure these were the issues so fired it up with clean tank of water in spray cart and run fans and PTO with no sprays on for 45mins.

I thought it was all good then checked spray cart water was full of oil. So I thought heat exchanger and talked to an old friend who knows a fair bit about the particular model, he confirmed yep heat exchanger.

Cooling element in heat Exchanger damaged(wear and tear) to be replaced.

I have only been spraying fungicides for 4 years and relatively new to this so didn't realise the signs like colour and smell of the oil. The mechanic convinced me the oil went like that due to a buggered hydraulic pump.

Thanks Shannon

 

Thanks for returning with the solution. I would caution you not to think your problem is solved. Water in the hydraulic system is contamination. Water doesn't play well with close tolerance parts. Check the bottom of the oil sump for water until you don't detect any. It will take a while to flush the system's nooks and crannies.

 

Thanks mate for your reply

I understand fully that it will take many flushes of the system to remove contamination and as its a vario speed transmission or however its spelt its paramount as I suspect tolerance of such is not high.

Still have slight visible contamination after 3rd full oil change minus filter. The water separates after sitting for 24hrs and I take out the sump plug and drain until I see clean oil.

Once I'm happy I'll do a complete flush and filter again then pump fresh oil into spray cart fan circuit while collecting oil from return end in a drum until I see clean oil

The way I see it is oil is expensive but machinery in Australia is hell expensive

I was also wondering if there's anything I can add to the oil that will help extend the life of internal components or help with water-oil separation?

Regards Shannon

 

Hey @Shannon01 I copped a load of water from an implement in my Deere. I considered a few options but ended up fixing if with oil changes. My tractor holds 26ltrs.
I guess your holds a lot more, so worth stripping the oil to use as a flush.
To boil off the oil, at atmospheric pressure, you need to hold it above 100 degrees Celsius. Deere recommends keeping it below 80 degrees.
Atmospheric pressure is around 100kpa.
To boil it off at 50kpa you need to heat to about 78 degrees. So if you can put it in a clean drum, heat to 80-85 degrees, then draw down the pressure, it’ll boil off as the pressure gets down to 50kpa.
An electric vacuum pump is ideal, but can also be done with a manual one.
Hope that helps.

 

Another way of stripping water from oil is via dry air. You aerate it with a bubble pump and a desiccant pack.
To do this method, you need a closed circuit air system. Using a 200ltr drum, draw the air out of top of the drum though the small bung, pump it through a pack of desiccant and then back into the bottom of the drum. You can do this with a tank skin fitting to the drum or via a skin fitting on the big bung. As you pump the dry air through the oil, it’ll pick up moisture and collect in the desiccant. Calcium chloride will do the job as a desiccant.

 

Hi everyone

I have a jd 6200 with the power quad trans.

The other day I changed the trans/hydraulic oil, filters and then found that I was only able to move the tractor about 300 feet before it stopped moving and the same time loader has almost stop moving. I dragged the tractor back to my shop and found after starting the engine that the oil goes foamy like a cafe late in about a minute, the loader barely goes up, but will with patience.

Any idea what may cause the air?

 

Was all working ok before changing oil and filters? Did you remove and clean sump screen? Did you have transmission pump suction tube off bottom of transmission? If all was working before service, I can only assume a suction leak has been created during service. Be sure correct filters and oil were used. make sure to replace orings on suction tube. also seal on plug to sump screen. If problem was there before service, then I would look for suction leak where charge pump bolts to top of differential case.

 

Thank you for your response

Was all working ok before changing oil and filters? YES Did you remove and clean sump screen? YES Did you have transmission pump suction tube off bottom of transmission? YES If all was working before service, I can only assume a suction leak has been created during service. Be sure correct filters and oil were used. make sure to replace orings on suction tube. also seal on plug to sump screen THIS I WILL DO . If problem was there before service, then I would look for suction leak where charge pump bolts to top of differential case. WILL DO

THANKS

 

Also FYI :
I have 24 psi at the charge pump.

When the tractor starts it lowers the level of the main sump immediately of oil and immediately starts to refill it slowly with a cafe-late, very foamy oil mixture.

I was wondering if the trans lube valve was stuck open allowing the trans pump to suck air in from the area beyond it which leads to the sump?

Thanks

 

Foam is caused by cavitation... Cavitation is defined as "air entering through suction side of pump"... If this is some sort of power reverser model and it sounds like you are dealing with the a thought to be issue with transmission pump then I'd look for the feed tube to the transmission pump which will be a large steel tube held on by 2 banjo bolts and look for it to have residue on it... If the whole system is foaming then chances are good that one of the main hydraulic pumps are cavitating causing the entire system to be foamed... More than likely the later is the case... I'd look for a metal feed tube larger diameter with rubber hoses and spring or worm gear clamps connecting it... More than likely this is where the air is bleeding into the system...