7520 problems AGAIN...

[Dougster]

Dougster, Ya wanna make me an offer? I'll send this sucker your way in a hurry.

Well, believe it or not... despite the bad attempt at humor above... I am not kidding if you are not kidding. If you are genuinely ready to dump that problematic "piece of junk" and move on to a different brand machine, let's please talk. I have some ideas about how we could end up in a very nice "win-win" situation.

I'll PM you my info and let's talk tomorrow if you are serious.

Dougster

 

[CuzPat62]

Dave,
Friday was the first time anyone from the dealer has seen my tractor's inability to lift something. I've told them about it several times and Friday they finally saw it firsthand. The service manager now knows that there is definatly a problem somewhere in the hydraulics. Maybe now we can get somewhere with this issue.

As I said, he thinks there is a problem with the loader control valve (joystick). It gets very hot to the touch during normal operation of the loader.

Reckon I can send my tractor to Kaliforney and let you fix it for me?

 

[SPYDERLK]

Dave,
Friday was the first time anyone from the dealer has seen my tractor's inability to lift something. I've told them about it several times and Friday they finally saw it firsthand. The service manager now knows that there is definatly a problem somewhere in the hydraulics. Maybe now we can get somewhere with this issue.

As I said, he thinks there is a problem with the loader control valve (joystick). It gets very hot to the touch during normal operation of the loader.

Reckon I can send my tractor to Kaliforney and let you fix it for me?

sounds like your relief valve is stuck partially open. Not exactly stuck, but doesnt seat fully. Try reving it up next time. If it lifts it will point to that as a probability. The extra flow will overcome the wasted fluid that is being constantly bypassed to the sump
larry

 

[DavesTractor]

Cuz, send it out, we will fix it! By the way, if the 3-point is also weak and the loader is a little jumpy, it will either be air being sucked into the system on the suction line or the RCV. Mahindra uses a name brand (and for the life of me I cannot remember the name right now) rockshaft control valve, and we found one that the bolt that holds the pressure relief spring in the RCV was loose, then it backed out a turn or two. Instead of 2000 plus psi, we maybe had a few hundred psi. We replaced the RCV and all was well. We could have just tightened the bolt, but Mahindra insists on replacing the unit so they can send the old one back to the supplier to demonstrate the problem and to keep it from happening again. We've only seen this once and we've sold a lot of these.

 

[rback33]

OK, I'll jump in here with Spyd and agree that it sounds like a relief issue of some sort. Your valve will get warm during use, but it should not get really HOT. If it's running over relief somewhere, then it will get hot and you will burn things up. Incidentally I had a man call me a few weeks ago because he found his hydraulics getting so hot it melted the rubber boot on his joystick to the valve. THAT is not good. I am sure Dave can explain exactly he did ( I referred him to Mahindra and his dealer) but I know it was the three point sending the tractor over relief. I hate to think how much damage he did with all that heat.

 

[CuzPat62]

Try reving it up next time. If it lifts it will point to that as a probability. The extra flow will overcome the wasted fluid that is being constantly bypassed to the sump.

We tried on Friday to get it to lift at different rpm levels. No matter how high you run the rpm's there was no change in the lift ability.

On Saturday, I tried this... just as soon as I started the tractor up, I went to the stump it would not lift on Friday. It would lift it up a foot or so off the ground but that was as high as it would lift. Friday it would not lift it at all. So, it would lift it a little when the tractor is cold. After the tractor reached operating temp I went back to the stump and it would not lift it at all.

I just got off the phone with a Mahindra rep and he is gonna try to get another rep over here maybe tomorrow or so.

 

[DavesTractor]

We tried on Friday to get it to lift at different rpm levels. No matter how high you run the rpm's there was no change in the lift ability.

On Saturday, I tried this... just as soon as I started the tractor up, I went to the stump it would not lift on Friday. It would lift it up a foot or so off the ground but that was as high as it would lift. Friday it would not lift it at all. So, it would lift it a little when the tractor is cold. After the tractor reached operating temp I went back to the stump and it would not lift it at all.

I just got off the phone with a Mahindra rep and he is gonna try to get another rep over here maybe tomorrow or so.

Good experiment, thicker oil did not bypass as easily. Where is it bypassing is the question, but it should not be too hard for the dealer to solve. It's not like it is lifting 3600 and it should be lifting 3900...that would be hard to solve, your problem is big enough to register with some proper testing. The Mahindra (corporate) service reps that I know are sharp. I've learned a lot from them myself. It sounds like you have a cooperative dealer. Combine those things, and you should be fixed up soon.