I need pictures of the hydraulic block for the power steering that is on the right side under the seat. Needing a picture of the back of the bock, like your standing in back of the tractor please. Its a 1700 4wd
Need Pictures
- Thread starter Tank
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The middle two pictures are identical, sorry. I thought the 1700's had a screw that you could adjust the relief pressure with, mine has the "Shim" style. Now my suspicion is that someone put the valves in the wrong place, not confirmed.
In the last pic you can see where I inserted a JIC elbow to hook up my 0-3000psi guage to. With the tractor started and warmed up, I raised my tph up as far as it would go til pressure built up, the highest I could get it to go was 1500psi and it would drop off from there to about 1350psi. I have switched both valve around, they are absolutely the same inside, and I still cannot get the pressures higher than stated above.
I do have a fel attached to the tractor, Ezee-On brand, the silver block in the pic between the power steering block and the pressure relief valve block.
I suspect a pump that needs new seals as well as a new lift cylinder seal as the tph drops quickly when tractor is turned off.
Sorry for the looooonnngg post but I would love some confirmation to my suspicions.
Please ask questions for I am new to tractors and my terminology is not proper I'm sure.
Thanks in advance.:thumbsup:
In the last pic you can see where I inserted a JIC elbow to hook up my 0-3000psi guage to. With the tractor started and warmed up, I raised my tph up as far as it would go til pressure built up, the highest I could get it to go was 1500psi and it would drop off from there to about 1350psi. I have switched both valve around, they are absolutely the same inside, and I still cannot get the pressures higher than stated above.
I do have a fel attached to the tractor, Ezee-On brand, the silver block in the pic between the power steering block and the pressure relief valve block.
I suspect a pump that needs new seals as well as a new lift cylinder seal as the tph drops quickly when tractor is turned off.
Sorry for the looooonnngg post but I would love some confirmation to my suspicions.
Please ask questions for I am new to tractors and my terminology is not proper I'm sure.
Thanks in advance.:thumbsup:
JC-jetro
Elite Member
Tank,
I'm not completely sure what pic you're looking for. You already posted yourself the pic in the manner you asked. Your plumbing of the hyd pump on yours looks a bit different than what I have seen. I don't have fel on my tractor. The pic below shows a representative 1700 with fel. if you notice the hyd block is between the spool valve and relief mechanism. In other words one relief is needed to control flow/pressure both to fel or spool. I just don't know why you should have two relief devices not knowing the rest of the plumbing for your fel.
-if you follow the discharge pipe from hyd pump (smaller dia) goes to 1st relif device. if you take the cover off at the end , it exposes a knob that you can fiddle with that adjust the operating pressure, cw rotation, stiffer spring and higher pressure. Reverse reduces the pressure.
-is your second relief plumbed to Power steering? if so then how is your fel plumbed. seems like to me the two lines out of hyd block should directly go to fel valves, right?
-9 out of 10 cause of hyd arm dropping after the tractor is off is piston seal but you might have leaky spool or leaky shock release mechanism in your piston head. changing the seal is painless and will cost you $10, a no brainer choice.
- you might have tired pump rather than bad seal. if main shaft seal is bad it'll cost you $12 to fix but it does not cover pump seal kit. pump case seal and internal seal don't do much to maintain pressure. if pump does not leak out probably seals are okay. The bushing seals internally in the pump only is used to lube the pump gear shaft in the bushing and that's all. not sure if your pump is bad as you might constantly by passing thru couple of relief back to diffy causing not being able to build up pressure beyond 1500.
-I can easily build up 2000-2100 psi and can increase another couple of 100 psi but elected not to do it as the pressure developed is more than what I need for my heaviest implement. You don't want to be in to a hurry to increase the pressure as you can damage your pump or at least the shaft seal in a shoprt time.
I have done both jobs you are asking and rate the job pretty doable if you're comfy with turning a wrench. I will leave you references to the links where I show details. Might be helpful for you.
Good luck,
JC,
A typical hyd block to divert flow to fel or a remote that uses main pressure relief mechanism.
This is the only pic I have a representative Power steering set up for 1700
http://www.tractorbynet.com/forums/new-holland-owning-operating/88973-sos-i-have-my-first.html
http://www.tractorbynet.com/forums/new-holland-owning-operating/90819-my-f-1700-testing-my.html
http://www.tractorbynet.com/forums/new-holland-owning-operating/130597-adjust-not-adjust.html
Thank you for the resonse JC. My power steering system is not set up like yours, my assist is at the base of steering colum from what I can tell, there are two lines coming from the inboard block in the pic and they run to the base of the colum. I will trace out the pump return and see where it goes. I'm curious about the adjustment "knobs" location, it appears as if it is in the power steering block instesd of in the relief block, because from this block there are the two lines that run to the power steering. I have removed both adjustment valves, one is the adjustable one with the screw and the other one is the adjustable one via shims/washers, I have compaired them to one another and they are identicle in every way, this wont cause my original problem of low pressure but I would like to make sure that all bits and pieces are in the proper place before diving into deeper repairs.
Again sorry for the cloudy descriptions and terminology.
Again sorry for the cloudy descriptions and terminology.
JC-jetro
Elite Member
Tank,
1500 psi may not be necessarily bad or real low pressure. In the gear type pump as you have pressure is developed against a pressure head. pressure head is the function of resistance caused due to the weight of implement. When you raise your lift all the way you are basically dead heading the pump against the relief device causing max pressure developed and consequent chattering of the relief device. You can not expect to get max pressure just by lifting of an implement. Your hyd system is open center and as soon as 3 point lift some implement to desired height then all of the fluid is diverted to diffy. In other words my empty carry all will cause a 400 lbs pressure at any given height, if I were to raise the implement the pressure temporarily climbs up but as soon as it reaches the desired height the pressure is 400 psi with the engine on or off.
So what I'm trying to say is that you have to read pressure when the relief device operates and that's max pressure developed. if you have some bay pass thru loader spool valve or power steering then You might read a little less pressure as you are not completely dead heading the pump. why bother with pump overhaul unless it is necessary. I'd fix the lift piston seal right away.
What knob are you talking about? if you're talking about one under the seat, then that is a rate of drop for 3 point and has nothing at all to low pressure vows.
JC,
ps. I don't have Power steering, the pic is another 1700 that I checked out.
