Oil & Fuel JD 3720 Hydro dipstick

[Deere Dude]

I have a 2010 JD 3720 and have a hydraulic concern.

I changed the hydro oil and filter according to the manual. The manual says the capacity is 7 gallons of Lo Vis Hygard. When I drained the oil I found I had about 9 gallons drained and when replaced it took 8.5+ gallons to get it to 1/4" below the full level on the dipstick. I don't have anymore oil but it would take another quart to reach the full mark.

I didn't have any attachments or hydro equipment hooked up, it was just the FEL and tractor and the FEL was not operated. Everything operates nicely but it was a concern I had. Lat year I had erratic hydro action and found I had to add 1 gallon to go from the bottom of the hash marks to the full mark, which surprised me because I thought it would be a quart, but ran better after that oil was added.

The question is, is the dipstick the right length? Either the book and internet are wrong or the dipstick is the wrong length. From the end of the dipstick to where it seats on the transaxle is 6 3/4".

Would one of you kind souls measure your dipstick the next time you get out to your tractor for me and let me know.

Chuck

 

[MORRISONSTEEL]

according to JDParts.

 

[Deere Dude]

View attachment 532777 according to JDParts.

Thanks, I'll go out and check the other specs.

 

[Eric102]

I wonder if they changed something in the 2010's? My 2008 3320 took a little over 7 gals just as the manual stated. Last time I checked it was at about the 1/2 way mark.

 

[sisupower]

I’ll check the Tech manual tomorrow.

 

[Deere Dude]

I’ll check the Tech manual tomorrow.

That would be great. I know it runs good at that full level and if it is a gallon low I seem to have have operational problems. But a gallon low would still be 8 gallons in the thing.

 

[brown40]

Its a big reservoir but can cycle almost twice per minute if you're using the ports.

I had an '86 ford ranger that took 5 qts--just like the manual said.

It was the only engine that reality and manual were the same. I stop one unit (quart gallon pint) before the manual and measure from there.

Don't know how you'd have gotten the wrong dipstick...

Easier to add than remove.

I did the sump and filter on the 3520 two years ago and don't remember the details--I do remember it didn't match the manual.

 

[Oldtink]

I did note when I changed oil in my 2010, 3520 that it took 1 gallon to go from bottom to top of the hash marks on the dip stick and that I too bought another gallon to top it off.......but didn't note how much more I actually used.
BTW my dipstick measures exactly the same as your's.

 

[sisupower]

Is yours a PowrReverser or eHydro? Either way PR shows 6.3 gallons and eHydro shows 6.8 gallons

 

[jim gerken]

Related, hopefully; my 2009 3720 was acting a bit weird. It occasionally would surge forward a couple inches like it was haunted. It concerned me of course, for safety reasons. Today I happened to check the oil level. It was at the bottom of the hash marks on the dipstick. So I added till it was full (cold). It took five quarts! So that dipstick has quite the range. Im hoping this cures my erratic transmission operation, time will tell. I did use it for an hour after topping it off, but tbe problem always was very intermittent and woulndt always happen any particular day.

 

[beenthere]

jim
How many hours on the hyd oil??

 

[jim gerken]

300 or so.

 

[beenthere]

Are you thinking that you are losing oil somehow? Or that the last oil change wasn't a complete fill?

 

[Deere Dude]

Just to add, I recall changing my hydro oil for the 400 hr first change and I poured in the required 7 gallons and maybe a little extra. I do remember having fits with how erratic the machines speed was.

Starting off from cold and idling it would not even move the tractor. The only time everything worked properly was when the engine was cranking at 2000 RPMs. After some correspondence from TBN folks I decided to check the fluid level again and it was at the bottom of the hash marks. So I added a quart and it barely moved the level. Finally I had to dump in a gallon to get it where it should be, then all was good.

But, the dipstick question was always hanging there for me. I think JD got a dipstick engineer that couldn't design dipsticks. Now I know to get 9 gallons and that seems to be the case with others with the same design tractor.

 

[Millalien]

The only time everything worked properly was when the engine was cranking at 2000 RPMs.

FWIW -- It took a trip to a Deere dealer with my 3320 to discover that the reason my tractor wouldn't move unless the RPM was cranked to 2,000 was that I'd inadvertently disabled Load Match by toggling the front rocker switch into the OFF position. It turns out that I have no power under load to the rear axle in 2WD with Load Match OFF at my usual working RPM of 1,500 RPM, which was news to me since I had never cruised around with Load Match off before.

 

[jim gerken]

At last change, the level might have been on the dipstick, which I now know is a large range, and then I added 20 feet of hose and a cylinder for a grapple, so there is half a gallon, and that pretty much covers the five quarts it was low. The lesson we are learning I guess is, keep an eye on the level, and keep it right on full. And, the dipstick wss designed by a dipstick.

 

[dieselade]

6.8 gallons