3-Point Hitch Newbie Hydraulic Question

[mja20]

Hello I am new to the tractor scene and need a little assistance. I have a 86 Ford 1910, my first question is when I shut off my tractor is it normal for my 3pt hitch to drop all the way down. Next is it normal for the tranmission and PTO to get very hot during bush hogging. Here is exactly what happened, I had to drive about 45 minutes across the lease before arriving to the spot I was going to cut, immediatly after getting there I started cutting in some pretty thick brush for aprox 1 hr. When I was done I shut down the tractor and noticed excessive heat coming from the transmission housing. I also heard a hissing noise coming from the top of the rear diff. After investigating the hiss I found it was some sort of relief valve. The PTO shaft was also very hot to the touch. I check the fluid and its clean and has the proper level. Any help would be greatly appreciated.

P.S. I am in South Louisiana and the temp that day was about 98 F. 100% Humidity

 

[Harry in Ky]

The answer to both questions is no. If the lift drops when engine is switched off, it indicates a sizable internal leak in the lift system. The heat issue could be pressurized oil forced through a small space(relief valve?) I assume the hissing sound is with engine running, right? The parts breakdown shows more than one hydraulic option for your tractor, with/without draft, single or double remote valve, etc. Each option has different componants that could be involved. I suggest you access an online parts break and identify the system and componants that most resemble what you see on your tractor. That should help narrow down the possible causes. Could be as simple as a sticky or rusted piece of linkage.

 

[JC-jetro]

Leaky lift piston seal is a huge possibility and the easiest to repair.

JC,

 

[mja20]

Thanks for the reply Harry. I do not have draft and I have a single remote valve. The hissing was when the tractor was not running. I said a relief valve but im not sure what it was. Its a vent on top of the rear differential and has a plastic cap on it. when I touched the cap it felt as if it was spring loaded and air started coming out even faster when I applied pressure sideways on it.

 

[mja20]

Where is the lift piston seal located? And wouldnt I see fluid leaking from the tractor. I dont see any visible leaks.

 

[mja20]

Leaky lift piston seal is a huge possibility and the easiest to repair.

JC,

Is this what you are talking about?

 

[JC-jetro]

Is this what you are talking about?

View attachment 268810

Bingo. Yep, #19.That is right. I'm not saying that is your problem for sure but the likelihood of this to be the culprit is very high. checking it easy , cost you one hr of labor if you do it yourself and material is under $15. I'd check it before I dive in any deeper to more sensitive part of the hyd system. You might look at the link below. There is a lot of info thee but you'll be able to find what you need.

JC,


http://www.tractorbynet.com/forums/new-holland-owning-operating/90819-my-f-1700-testing-my.html

 

[mja20]

Bingo. Yep, #19.That is right. I'm not saying that is your problem for sure but the likelihood of this to be the culprit is very high. checking it easy , cost you one hr of labor if you do it yourself and material is under $15. I'd check it before I dive in any deeper to more sensitive part of the hyd system. You might look at the link below. There is a lot of info thee but you'll be able to find what you need.

JC,


http://www.tractorbynet.com/forums/new-holland-owning-operating/90819-my-f-1700-testing-my.html

Thanks JC! Looks like a easy job. Im guessing this isnt going to help the overheating problem though. Any suggestions on that?

 

[JC-jetro]

Thanks JC! Looks like a easy job. Im guessing this isnt going to help the overheating problem though. Any suggestions on that?

On the heat issue, what did the t-gage read then? did you measure the pto shaft temp? I have done the same cutting very tall weeds over 7 feet with my little 1700 and temp went up just 1/8" shy of red engine, head, got hot but nothing above 230 deg. Diffy and rear end is such a goo heat sink and has a good ability to dissipate as long as there s good oil flow? have you measure hyd level in the transmission? is it low? the rear end get lubricated by splashing? I think there might be a possibility that the pto final shaft is running a bit dry, causing more friction ad hence getting hot. Relief valve should not hiss because it does not leak down. On over pressure it will cause the rel if to chatter but inky when the engine on and then hissing is hard to here. I think the hissing might be caused by oil leaking out of the lift piston seal. Do you have hyd oil filter or screen in diffy? I'd check or replace and make sure hyd level is where it needs be.

JC,

 

[mja20]

On the heat issue, what did the t-gage read then? did you measure the pto shaft temp? I have done the same cutting very tall weeds over 7 feet with my little 1700 and temp went up just 1/8" shy of red engine, head, got hot but nothing above 230 deg. Diffy and rear end is such a goo heat sink and has a good ability to dissipate as long as there s good oil flow? have you measure hyd level in the transmission? is it low? the rear end get lubricated by splashing? I think there might be a possibility that the pto final shaft is running a bit dry, causing more friction ad hence getting hot. Relief valve should not hiss because it does not leak down. On over pressure it will cause the rel if to chatter but inky when the engine on and then hissing is hard to here. I think the hissing might be caused by oil leaking out of the lift piston seal. Do you have hyd oil filter or screen in diffy? I'd check or replace and make sure hyd level is where it needs be.

JC,

The engine temp was reading normal, just below half. According to the dipstick my level is full. There is no filter or screen on the differential that I can see on the parts diagram. I think the only filter is the main hydraulic filter by the pump. I do not think that the hiss I hear is actually the relief valve as it is some type of vent on the rear end. Once again thank for all the help. I am kind of clueless when it comes to hydraulics. Engines and electrical and I am in good shape. BTW would you know what I should expect to read if I shoot the Trans housing with a IR thermometer after a good running?