72d belly mower for 3520 drops

[deerecat]

Hello Everyone,
I have had my new tractor back to the dealer two times and they keep telling me, John Deere says the hyd, cyl is to raise the deck and not hold it up and use the locking pin, John deere says in a service letter that if the deck bleeds off in under 7mins that something is wrong then, I think that it should hold it up for 8hrs at the min. The dealer timed it and it takes 25 mins. to bleed off. They did fix the 3pt from bleeding off and thats great, But I'm not very happy to spend all that money and the deck Bleeds off . Anyone else out there have a problem like this. Other then that I love the tractor and loader,

 

[bud4410]

my 72d mower on my 3520 also bleeds off in 2 to 3 mins. the deck only uses one hyd line to the cyl. on my old 4410 with a 72" mmm it did not bleed off but it used two lines to the hyd cyl. ???????? beats me...........bud

 

[KB9UDE]

One way (single hyd line) cylinders are known for bleeding off over time. I have a hyd lift kit on my 2320's 62D drive over deck and it bleeds off so fast you can watch it go down like in 45 seconds...It did not make me happy but the dealer says there is nothing they can do.

 

[Gator6x4]

Hydraulic cylinders without a pilot valve leak down. Adding a pilot valve would probably add 8-10 dollars to the cost of the valve. John Deere must feel the extra cost would prevent a sale.

 

[radman1]

Hydraulic cylinders without a pilot valve leak down. Adding a pilot valve would probably add 8-10 dollars to the cost of the valve. John Deere must feel the extra cost would prevent a sale.

It is a one way cylinder. Check valve won't work. As far as I know, it takes pressure from the other hose to create enough pressure to open the check valve.

 

[Nuru]

So we need a locking pin to keep it up? I have a 72" but I would imagine the 72d is heavier so it comes down in a lot less time than mine does. That is one of the next things I wanted to work on.

 

[jd670]

If you have the trird scv, why can't you put a regular cylinder on the mower deck to hydraulicly raise or lower? My 72" deck on my 3320 works that way. It stays up when raised.

 

[deerecat]

What I mean by locking pin is the deck height pin, if I got to get out of the seat to move it , Why just not flip the two levers and remove the gauge wheel pins and remove the deck all together, It has seem that i have anwersed my own ? . It is a Poor set up By Deere and one they need to fix. I work on coal mine equiment all day long. and if they had a cyl bleed off that quick we would have to fix it, Most of CAT spec of cyl drift is 1/4" in 3 mins. If the mower deck is so hevay that the cyl that on there won't hold it up put on a bigger cyl.. I love everything eles about the tractor but there about to get it back if they don't get fixed. Its not that i'm layz, Its that I spent $3500 on a mower deck that bleeds off My inlaws have a 445jd mower and the deck stays up on it and i dove it 4miles to my house before i got my 3520 to mow. I can't drive the 3520 back to the dealer 1 1/2 miles up the road with out the deck droping three times, thanks for everyones help:thumbsup:

 

[WV John Deere]

If you have the trird scv, why can't you put a regular cylinder on the mower deck to hydraulicly raise or lower? My 72" deck on my 3320 works that way. It stays up when raised.

This sounds like what we need to look at for a solution. My 3520 uses one line off of the rear scv. Why not use the 3rd funct. ports that are closer to the deck cyl. anyhow rather than run a longer line all the way to the rear of the tractor This would make more sense IMO. Mine leaks down quickly also.:thumbdown:

 

[sunnyside360]

If you have the trird scv, why can't you put a regular cylinder on the mower deck to hydraulicly raise or lower? My 72" deck on my 3320 works that way. It stays up when raised.

jd670, yours works like my 3 yr old 7 Iron 72" mmm on my 3720 cab tractor. It takes several hours to leak down. The cylinder which raises and lowers the deck has two lines to/from the rear scv -- not one line.

 

[jcalla]

I just found out from the salesman that the 7 iron 72 inch belly mower for my new 4720 that I ordered operates off the same control as the 3 point hitch. I don't understand why it does since it has a midpoint hydraulic connection. I want to be able to mow and keep my 7' wide box grader on at the same time. Can anyone tell me what is going on here? It seems that the salesman is not too knowledgable about what he is selling.

JPC

 

[kennyd]

This sounds like what we need to look at for a solution. My 3520 uses one line off of the rear scv. Why not use the 3rd funct. ports that are closer to the deck cyl. anyhow rather than run a longer line all the way to the rear of the tractor This would make more sense IMO. Mine leaks down quickly also.:thumbdown:

It does not matter how long the line is-that is not the cause of the leak. The connection at the rear IS the "3rd SCV"

 

[kennyd]

I just found out from the salesman that the 7 iron 72 inch belly mower for my new 4720 that I ordered operates off the same control as the 3 point hitch. I don't understand why it does since it has a midpoint hydraulic connection. I want to be able to mow and keep my 7' wide box grader on at the same time. Can anyone tell me what is going on here? It seems that the salesman is not too knowledgable about what he is selling.

JPC

He is wrong. Only the 2x20 series uses the 3PH for deck control. The larger machines use the 3rd function hydraulic valve for the MMM's.

 

[jcalla]

Kennyd,
I told the salesman that it was available for the larger series (4720). He informed me that it was only available for the 3720 & below. He works at the John Deere (Eahart dealership) in Warrenton, VA. Could I possibly talk to you by phone since you are in the area? I really need this MMM to have its own hydraulic control valve not running through the 3PH.

John Callaway

 

[kennyd]

Kennyd,
I told the salesman that it was available for the larger series (4720). He informed me that it was only available for the 3720 & below. He works at the John Deere (Eahart dealership) in Warrenton, VA. Could I possibly talk to you by phone since you are in the area? I really need this MMM to have its own hydraulic control valve not running through the 3PH.

John Callaway

John,
I think I have misled you

I just looked in JD parts, and only found the rockshaft lift control. I had mistakenly ASSumed that it was set up like the 3x20 series machines.

See the picture below...I am sorry to have confused the issue. Check you PM's for my #

 

[soulasphil]

I have a JD 60" D Autoconnect MMM on my 3520 and am very happy with it in spite of a few glitches.
It is worked by one of the FEL lines (the black one on the pic), so you operate it with the FEL lever, which is quite convenient. It is a single action cylinder and works in a bizare fashion. If you move the lever in the direction corresponding to the line you used and maintain it there, the mower goes up then down, then up again and seems to cycle endlessly. That is not convenient at all.
It does bleed down, but it takes several hours and doesn't seem to happen when the engine is running.

 

[jcalla]

Kenny,
Thanks for your response. Got #. I think we (Eaheart Dealer salesman & I) are on same page now, however he did order wrong 72" 7 iron. I wanted the drive over. He now informs me that the drive over is not available for the 4720. I think I am going to forget the deck altogether. I still want the tractor. The deck is no good to me if I have to operate it in conjunction with the 3PH since I want my 7' box grader on back. I think this is a good tractor. I am getting the divereter valve kit for the 3PH leveling kit so I don't have to level the 3PH manually. I also am going to try & mount the 84" front blade. I picked one up in Ohio rather cheap. I think it will work. What do you think of this tractor?

JPC

 

[kennyd]

Kenny,
Thanks for your response. Got #. I think we (Eaheart Dealer salesman & I) are on same page now, however he did order wrong 72" 7 iron. I wanted the drive over. He now informs me that the drive over is not available for the 4720. I think I am going to forget the deck altogether. I still want the tractor. The deck is no good to me if I have to operate it in conjunction with the 3PH since I want my 7' box grader on back. I think this is a good tractor. I am getting the divereter valve kit for the 3PH leveling kit so I don't have to level the 3PH manually. I also am going to try & mount the 84" front blade. I picked one up in Ohio rather cheap. I think it will work. What do you think of this tractor?

JPC

Good machine...good reputation. Do a search for "4720"

The 84 blade should fit OK-maybe some small mods here and there...

Why in the world do you want to mow with box blade on the rear?:confused2: