Recently began having troubles with the hydraulics on my JD 2640, first chattering when running the FE loader and now loss of steering when warmed up Mechanic is looking for problem, says likely internal hydraulic pump. Here's the question: a year ago when I put the loader on the tractor, I changed the hydraulic oil with a "meets JD specs" oil from Tractor Supply, Naviguard if I recall. Now I am wondering if that caused the pump failure. When I was at the JD dealer, I noticed that he sells the same stuff as I had bought considerably cheaper than the JD Hytrans which he also carries. When I asked him what he thought about the cheaper oil,his reply "I wouldn't use that stuff in your tractor." Putting aside why he sells it at all, what do you think. Is there really a difference if the ratings are the same which according to the bucket label they are. Did that do my pump in?
- Thread starter taem
- Start date
For the most part, oil is oil, and it all lubricates. Usually the difference in price is a different, or better additive package. Most people will never use their machine enough to ever notice the difference. In your case I'd say a pump failure, this soon after changing to a acceptably rated oil, was nothing more than a coincidence.
"Mechanic is looking for problem, says likely internal hydraulic pump."
FIRE the wannabe "wrench", and NOW, as a 2640 has NO "internal hydraulic pump".
Find someone who is familiar with the quirks and peccadilloes of that hydraulic system and can follow the troubleshooting sequence in the factory shop manual and actually nail down the root cause, instead of blindly throwing a grand or three of it.
FIRE the wannabe "wrench", and NOW, as a 2640 has NO "internal hydraulic pump".
Find someone who is familiar with the quirks and peccadilloes of that hydraulic system and can follow the troubleshooting sequence in the factory shop manual and actually nail down the root cause, instead of blindly throwing a grand or three of it.
The oil MIGHT have caused an issue but I would think it is more of a JD 2640 issue. The system in them really can be a nightmare to fix if you do not understand how they work. Also if one component goes south, running it after that can easily ruin other parts of the hydraulic system.
First thing is to get rid of the current fellow. You need to have pressure readings and flow rates to tell what/where the trouble is. Not guessing at the problems. It could be the transmission or charge pump. It also could easily be the PTO and or Hi-Lo lines if it has that option.
Also how is the loader plumbed??? IF your just running it out the rear SCVs or using a power beyond kit with out dumping the return oil back in to the charge circuit, you will have chattering loader operation and a starved main hydraulic pump. Which could have worked for a while but now has failed.
Here is the bad news. It almost never is a CHEAP repair on a JD 2640 hydraulic system.
First thing is to get rid of the current fellow. You need to have pressure readings and flow rates to tell what/where the trouble is. Not guessing at the problems. It could be the transmission or charge pump. It also could easily be the PTO and or Hi-Lo lines if it has that option.
Also how is the loader plumbed??? IF your just running it out the rear SCVs or using a power beyond kit with out dumping the return oil back in to the charge circuit, you will have chattering loader operation and a starved main hydraulic pump. Which could have worked for a while but now has failed.
Here is the bad news. It almost never is a CHEAP repair on a JD 2640 hydraulic system.
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
I'll bet hyd pump hasn't failed! Wrong type hyd oil can cause brake linings to fail.
There are too many hyd components on a JD utility tractor that require diagnostics before one can intelligently state "the pump has failed". Does tractor have hyd ind pto & hyd hi-lo? How is loader hyd's attached to tractor hyd system? If loader is controlled by ind hyd valve is valve the closed center type?
How long since hyd filter was changed & sump screen(parts key 15)was checked/cleaned Also it's possible valve in photo that is hyd filter relief valve could be stuck open.
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
Bob
May I ask what do you think internal trans pump is if not a hyd pump? Trans pump is internal & performs some hyd functions.
Thanks,Jim
To go along with what the others have said, The brake lining has probably failed, clogging the sump screen, as well a sending filings from the brake housing through the system,,the line of travel for the trans oil is through the sump screen (which is about like a screen door),,it will keep the big chunks out but "Not" the filings,, then onto the transmission pump which is pumping the filings,,and they in turn are eating at the transmission pump in a constant action,, then from the trans. pump through the filter, now at that point the filings are being filtered out, but some still get through the filter to contaminate the rest of the system,, when all of this takes place it is near like trying to cure cancer.. The first thing that needs to happen is to inspect the brakes, then replace the trans pump as well as the trans pump lines ( he fatigue and they don't cost much) flush everything that you can, all the nooks and crannies,, place a few very good magnets in the bottom of the trans case, go back together with the correct oil,,Kiss it on the hood and hope for the best. The longer the filings swirl and grind on the internal valves the more issues that will develop,, and "Then" if that don't work....reach for the dynamite ;^)
The economy 303 was at one time the JD spec oil . After numerous problems the specs were up graded . Most systems do more than hydraulically pressurizing a cylinder and may need high pressure / wear additives for gear contact etc .
Unless you are using the oil in a hydraulic only tank it would be better to stay away from "economy" or "303" hydraulic oils .
Mike Aylward
Well-known Member
Years ago when I worked at a John Deere dealership as a mechanic we installed a new set of brake pads in a 4430. We put Hy-Gard in the system and thought all was well. The customer used another oil (Shaeffer or Cen-Pe-Co, can't remember which) and used it to add to the tractor. He called back in a week and complained his brakes were growling. We brought the tractor back to the shop and when we removed the axle housing we found the problem. The brake pads were gone. The rivets were still there and flopping around but not a sign of a brake pad. We found out not all hydraulic oils play well together and can actually be antagonistic. It sounds as though this might have happened to you. Some oils work together just fine but others cause much trouble. To me, the savings on the cost of oil is not worth the risk of the possibility of hydraulic or transmission problems. Mike
Thanks for the comments so far. A few clarifications: the hydraulic filter was changed when loader added less than 200 hours ago. the PTO, rockshaft and high-low work fine. the steering and loader are the problem Mechanic has just started diagnostics and was thinking that the transmission pump might be the problem or valves in the steering circuit. He is by no means a novice and has done a lot of work for me including an entire engine rebuild on a 2240 that I have that has performed flawlessly for the 8 years since he did it. The loader is plumbed off an existing T on the line to the SCV and returns to the cover over the hydraulic filter.
buickanddeere
Well-known Member
Lets ad to that all too often Bubba drives the tractor until it quits then performs minimum service.
Change an oil filter as per the operator's manual ? What manual, I don't need no stinking manual.
The transmission lubrication emergency bypass valve has opened due to the transmission filter being plugged and contaminated unfiltered oil is being pumped to bearings and seals etc.
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
I would suggest to cap steering line and operate with manual steering for a test plus raise loader boom then disconnect/cap loader valve supply line for a hyd test. JD utility tractor steering valve o-rings(6 large ones) have a history of failure with a lot of tractor operation. FEL valve can blow the closed center conversion plug seal causing hyd pump to cavitate.
Not sure where that is going. The manual after breakin suggests changing the hydraulic filter every 500 hours. Done 200 hours ago, spring maintenance included new oil, air, & fuel filters, a new thermostat and flush of cooling system by me plus a pressure test on the loader circuit by my mechanic since it was seeming a little slow. So Bubba here is doing his duty. I still have a problem and am going to run down each of the suggestions that have been helpfully offered
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