7520 MFWD PTO

MidMaineHay · Nov 19, 2011

This spring when I hooked my 7520 up to the disk mower and went to engage the PTO I could feel it grinding through the level like the clutch was not disengaging. Being crunch time and the fact that I have tractors for each piece of equipment I just swapped it to the wagons and figured I would deal with it at the end of the season.

It seems to me that quite possibly one of the clutch plates may be sticking to the pressure plates since the tractor sat for about 8 months prior to being fired up.

I really want to avoid splitting the tractor if I can and want to know if I may be overlooking anything simple.

Steve

bindian · Nov 20, 2011

MidMaineHay said:
This spring when I hooked my 7520 up to the disk mower and went to engage the PTO I could feel it grinding through the level like the clutch was not disengaging. Being crunch time and the fact that I have tractors for each piece of equipment I just swapped it to the wagons and figured I would deal with it at the end of the season.

It seems to me that quite possibly one of the clutch plates may be sticking to the pressure plates since the tractor sat for about 8 months prior to being fired up.

I really want to avoid splitting the tractor if I can and want to know if I may be overlooking anything simple.

Steve

Did you disengage the clutch, then move the PTO "on-off" lever forward into the slot to engage the PTO shaft, then move the clutch lever rearward to engage the clutch? If not, you can tear it up. Did the clutch warning horn blow while trying this?
hugs, Brandi

MidMaineHay · Nov 20, 2011

bindian said:
Did you disengage the clutch, then move the PTO "on-off" lever forward into the slot to engage the PTO shaft, then move the clutch lever rearward to engage the clutch? If not, you can tear it up. Did the clutch warning horn blow while trying this?
hugs, Brandi

Yup, disengaged the clutch but when going to move the on-off lever that is when you can feel it rumbling in your hand, just like the clutch is still engaged. I have 3 "20" series tractors and both of the 6520's are bullet proof beasts.:thumbsup: It's just that this one sat for a while and sometimes you know how gremlins find there way.

SPYDERLK · Nov 20, 2011

Disable the switch that prevents you starting the tractor when the PTO is engaged. With engine off engage the PTO gear and start the engine with the PTO clutch disengaged. This should break it free. If not, use it with clutch engaged and operate the clutch occasionaly. Should un stick before long.
larry

MidMaineHay · Nov 20, 2011

That's what I was going to do but the forecast changed and I was under the weather gun to get 3000 bales of straw made for an erosion control contractor.

Might have to borrow the neighbors logging winch and pull a few trees out of the woods to see if that will free it up.

bindian · Nov 21, 2011

MidMaineHay said:
Yup, disengaged the clutch but when going to move the on-off lever that is when you can feel it rumbling in your hand, just like the clutch is still engaged. I have 3 "20" series tractors and both of the 6520's are bullet proof beasts.:thumbsup: It's just that this one sat for a while and sometimes you know how gremlins find there way.

When I bought my 6520, I thought the 7520 would give more problems. Guess I was right. Your right, they are beasts and mine is The Big RED Beast.

You can't beat cubic inches.:thumbsup:
hugs, Brandi

MtnViewRanch · Nov 21, 2011

bindian said:
When I bought my 6520, I thought the 7520 would give more problems. Guess I was right. Your right, they are beasts and mine is The Big RED Beast. You can't beat cubic inches.:thumbsup:
hugs, Brandi

Brandi, want to compare problems? I have had 3 with my 7520. Brake light switch sticks, PTO safety switch went bad and a nut on the steering control box was loose and leaked oil. Tightened the nut up, no more leak, replaced the PTO switch & live with the sticking brake light switch.

Why would you think that the 7520 would have more problems, because of the turbo? :confused2:

SPYDERLK · Nov 21, 2011

MtnViewRanch said:
Brandi, want to compare problems? I have had 3 with my 7520. Brake light switch sticks, PTO safety switch went bad and a nut on the steering control box was loose and leaked oil. Tightened the nut up, no more leak, replaced the PTO switch & live with the sticking brake light switch.

Why would you think that the 7520 would have more problems, because of the turbo? :confused2:

I disabled my pto switch early on. If that clutch switch sticks Im ready.

... Had a severe momentary worry when I lost 4wd Fri while I was stirring the manure pile. I got stuck in the pile so I had to wait quite a while before I could recover it with little tractors and determine that it was external. The 4wdriveshaft had twisted off. Its the power!

larry

MtnViewRanch · Nov 21, 2011

SPYDERLK said:
I disabled my pto switch early on. If that clutch switch sticks Im ready. ... Had a severe momentary worry when I lost 4wd Fri while I was stirring the manure pile. I got stuck in the pile so I had to wait quite a while before I could determine that it was external. The 4wd driveshaft had twisted off.
larry

:shocked::shocked: Of course you know that that happened because you have your tires loaded and it is just to much traction for that little ol shaft to handle.

At least it should be an easy fix.

SPYDERLK · Nov 21, 2011

MtnViewRanch said:
:shocked::shocked: Of course you know that that happened because you have your tires loaded and it is just to much traction for that little ol shaft to handle. At least it should be an easy fix.

It was a fatigue failure. You can see where a crack started and progressed thru about 30% of the shaft area before it twisted off the remainder. Im going to give the new shaft some preparation before putting it on to eliminate stress risers that give a place to start cracks. I think the shaft is strong enuf ... just not quite finished in the fabrication process.
larry

bindian · Nov 21, 2011

MtnViewRanch said:
Brandi, want to compare problems? I have had 3 with my 7520. Brake light switch sticks, PTO safety switch went bad and a nut on the steering control box was loose and leaked oil. Tightened the nut up, no more leak, replaced the PTO switch & live with the sticking brake light switch.

Why would you think that the 7520 would have more problems, because of the turbo? :confused2:

Yes, the turbo. More things to go wrong. I have always liked pure cubic inches. But, the 17 gpm pump over rules all this..........if only I would have looked more at the 7520 for $2000 more. Oh the anguish of just a 11.2 gpm pump.:ashamed:
hugs, Brandi

MtnViewRanch · Nov 21, 2011

bindian said:
Yes, the turbo. More things to go wrong. I have always liked pure cubic inches. But, the 17 gpm pump over rules all this..........if only I would have looked more at the 7520 for $2000 more. Oh the anguish of just a 11.2 gpm pump.:ashamed:
hugs, Brandi

Brandi, have you ever known of anyone with a stock OEM turbo that has had a premature problem? Turbos have to be one of the most reliable engine components that there is. There is a good reason that just about every diesel truck on the road has one. Had any problems with the Dodge? I have an aftermarket Banks turbo on my 7.3 that has over 200k miles on the turbo and still going strong.

My opinion is that a lot of people have unwarranted fears about turbos, probably because they do not understand them. Me, I doubt that I would own a newer diesel engine that didn't have a turbo on it.

Just my :2cents:

MtnViewRanch · Nov 21, 2011

SPYDERLK said:
I disabled my pto switch early on. If that clutch switch sticks Im ready. ... Had a severe momentary worry when I lost 4wd Fri while I was stirring the manure pile. I got stuck in the pile so I had to wait quite a while before I could recover it with little tractors and determine that it was external. The 4wdriveshaft had twisted off. Its the power!
larry

Larry, is the driveshaft repairable, or do you have to get a whole new unit from Mahindra? If the ends are good, I would fix it myself.

SPYDERLK · Nov 21, 2011

MtnViewRanch said:
Larry, is the driveshaft repairable, or do you have to get a whole new unit from Mahindra? If the ends are good, I would fix it myself.

Im buying new ... ~$194, but I will probably repair the old for a spare - splines are good. My thought is that even the very best repair will not be as good as the one that failed. We are talking a 1.150 inch diameter Gr8 or better strength shaft twisting back and forth at perhaps 80%+ of its torsional yield. Idont think the part has a large safety margin above what the engine is capable of in low gear. Ive never actually been able to link all of it to the ground thru the fronts, but real close by pushing and lifting. I think that shaft is called upon to transmit well over 2000ftlb on occasion. I plan to inspect the new shaft well and return it if there are any dings. If not, Ill polish out all the machine marks and peen and paint it before installation. I want to give it a good chance of long term survival.
larry

bindian · Nov 22, 2011

MtnViewRanch said:
Brandi, have you ever known of anyone with a stock OEM turbo that has had a premature problem? Turbos have to be one of the most reliable engine components that there is. There is a good reason that just about every diesel truck on the road has one. Had any problems with the Dodge? I have an aftermarket Banks turbo on my 7.3 that has over 200k miles on the turbo and still going strong.

My opinion is that a lot of people have unwarranted fears about turbos, probably because they do not understand them. Me, I doubt that I would own a newer diesel engine that didn't have a turbo on it.

Just my :2cents:

Brian,
We're talking almost 5 years ago hindsight. Up to then, I only had experience with after market turbos on Mooney aircraft, which were labor intensive and had asbestos in them. I didn't like working on them back then. This was back when Banks was starting to put turbos on Ford pickups.
hugs, Brandi

MtnViewRanch · Nov 22, 2011

bindian said:
Brian,
We're talking almost 5 years ago hindsight. Up to then, I only had experience with after market turbos on Mooney aircraft, which were labor intensive and had asbestos in them. I didn't like working on them back then. This was back when Banks was starting to put turbos on Ford pickups.
hugs, Brandi

I guess you get a slide on this, but the same holds true for then and now, research, research, research.

bindian · Nov 23, 2011

MtnViewRanch said:
I guess you get a slide on this, but the same holds true for then and now, research, research, research.

That's mighty chivalrous of you. Do you still have that white glove of your neighbor's?:laughing:
hugs, Brandi

MtnViewRanch · Nov 23, 2011

bindian said:
That's mighty chivalrous of you. Do you still have that white glove of your neighbor's?:laughing:
hugs, Brandi

:laughing: :thumbsup: Ok Ok I'm done, you win.

You know that my wife went to great extremes to do that whole thing with Doug. Had it mailed to Doug from Santa Barbara so that it would have the correct PO stamp zip code along with other things. It had him going for awhile.

Hope you have a nice Thanksgiving along with a happy holiday season.

bindian · Nov 23, 2011

MtnViewRanch said:
:laughing: :thumbsup: Ok Ok I'm done, you win. You know that my wife went to great extremes to do that whole thing with Doug. Had it mailed to Doug from Santa Barbara so that it would have the correct PO stamp zip code along with other things. It had him going for awhile.

Hope you have a nice Thanksgiving along with a happy holiday season.

:laughing::laughing::laughing: Brian, I hope Y'all have a wonderful Thanksgiving and a very Merry Christmas.
hugs, Brandi