SOS, I have my first tractor problem, Hydraulic lift issue
- Thread starter JC-jetro
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JC-jetro
Elite Member
I am about plumb out of ideas, but couple of more things to do.
1- Look at the pics where I put a 3000 psi oil filled pressure gauge and run the tractor , raise and lower the lift arm handle and see what you read there and report. I bought mine from Northen Tools for under $15 ten years ago.
2- look at the pics that show lift arm on the right side of the tractor. There is a feedback arm that brings the the 3point spool to the neutral position and any given height of the 3 point. Take the cutter pin our and remove the pin. Be extremely careful not to get your fingers jammed as it will be very dangerous. Grab the end of the rod with a vice-grip. Have some one else start the tractor and manipulate the lift arm. See if arms lift, then rotate the rod left and right and manipulate to see if there is any change and report back.
If you have pressure reading and cannot raise the arm then there is good chance that your lift spool valve is bad and that is not a good thing, or cheap to fix.
JC,
Attachments
I have the gauge. I have zero pressure when lifting the arm handle.
I removed the pin. It moves back and forth with ease, even with the tractor running. Not sure if that means anything. Nothing moved when I manipulated it.
THanks
Scott
I removed the pin. It moves back and forth with ease, even with the tractor running. Not sure if that means anything. Nothing moved when I manipulated it.
THanks
Scott
OP
JC-jetro
Elite Member
Which arm? are you talking about the lift arm? or feed back rectangular metal piece?
The feed back piece returns the spool valve to neutral position or basically dumps the unused hyd fluid back to diffy housing.
if you have no resistance there then I can deduct you have no flow there at the spool.
Not having pressure at the gauge is indication of no flow ?
Does the needle on the gauge move any at all?
Previously you said you had flow at the discharge banjo fitting at the pump so I can only assume your screen is clean and not plugged up.
You also said that once you took the spring at the pressure regulator you had flow.
When you had the feed back arm pin removed and with the tractor on, did you manipulate the lift position control lever?
If all you said was completely accurate then you would have flow to the spool valve and the spool valve is defective.
This is pretty strange. Please reply to my questions and articulate as much as what you do or see.
The feed back piece returns the spool valve to neutral position or basically dumps the unused hyd fluid back to diffy housing.
if you have no resistance there then I can deduct you have no flow there at the spool.
Not having pressure at the gauge is indication of no flow ?
Does the needle on the gauge move any at all?
Previously you said you had flow at the discharge banjo fitting at the pump so I can only assume your screen is clean and not plugged up.
You also said that once you took the spring at the pressure regulator you had flow.
When you had the feed back arm pin removed and with the tractor on, did you manipulate the lift position control lever?
If all you said was completely accurate then you would have flow to the spool valve and the spool valve is defective.
This is pretty strange. Please reply to my questions and articulate as much as what you do or see.
Which arm? are you talking about the lift arm? or feed back rectangular metal piece?
The arm in the second picture you posted above. It has the cotter key/pin. Feedback arm.
The feed back piece returns the spool valve to neutral position or basically dumps the unused hyd fluid back to diffy housing.
if you have no resistance there then I can deduct you have no flow there at the spool.
Not having pressure at the gauge is indication of no flow ?
I have zero reading on the gauge. The needle never moves.
Does the needle on the gauge move any at all?
Previously you said you had flow at the discharge banjo fitting at the pump so I can only assume your screen is clean and not plugged up.
You also said that once you took the spring at the pressure regulator you had flow.
It has flow from the pump, to the banjo by the seat and you can see if cascading down
When you had the feed back arm pin removed and with the tractor on, did you manipulate the lift position control lever?
I did not try to move the position lever with the pin out. I can try.
If all you said was completely accurate then you would have flow to the spool valve and the spool valve is defective.
This is pretty strange. Please reply to my questions and articulate as much as what you do or see.
.........
OP
JC-jetro
Elite Member
Scott, things just don't make sense. I can not see a complete picture with the exception of you do not have flow for several reasons (suction screen plugged, pump not working or very weak or all flow is diverted. to the differential case without being used at the spool calve.
1- try to lever question on post #55.
2- refer to post #43, remove the the cap, balls and spring. turn the tractor on. Do you see oil is coming out. we need to figure out how far the flow if any goes.
1- try to lever question on post #55.
2- refer to post #43, remove the the cap, balls and spring. turn the tractor on. Do you see oil is coming out. we need to figure out how far the flow if any goes.
With this piece attached to the gauge removed, the below pic is looking in.
It seems like all the flow is being diverted into the differential. I can start it and see fluid flowing into the case. It hards to tell in the pic, but these parts are covered in oil.
I'm not sure what you mean "try to lever question on post #55?"
The piece in post 43, it has no oil coming out.
OP
JC-jetro
Elite Member
Scott,
Position control lever is the lever you use to raise and lower the 3 point lift arm. What I meant was to raise and lower the lever and observe the pressure in the gauge to see if it changes.
When the oil comes out of the spool valve does it appear to have a lot of pressure. Having oil coming out of spool and not registering any pressure means all of the oil is diverted to diffy and points at some defective element within your spool. i never took my spool valve apart to give you guidance there.
I have another crazy idea, on your second picture the hole on the lift cover with the o-ring is pressure port or oil port going to 3 point lift cylinder head. why don't you get an rubber tipped air nozzle to see if you can push any air in to the oil passage way. while you are doing that have someone raise and lower the position control lever. I am hoping something is stuck there and yo might be able to push it out.
Pressure is made when oil flow from the pump hit the pressure regulator spring against the poppet valve. so if the spring pressure is not enough or adjusted in enough that may not allow a lot of pressure made. Turning the screw on the outside of the relief device increase the spring tension hence more pressure. Might want to turn the adjustment screw clockwise a turn and two and see if you can read any pressure at the gauge.
I wish there was easy way to put a pressure gauge between the pump and the relief device to see if your pump is actually making any pressure.
let me know, we should solve this problem one way or another, it is getting ridiculous
PS. Pt your rubber tipped air nozzle in the hole and put air in and the manipulate the lift arm.
You can also take off the pressure regulator cover off and see if yiu can get some air coming out of that fitting. I am trying to establish if the oil path is open. Second picture on post #41. see if any air comes out of the fitting.
Position control lever is the lever you use to raise and lower the 3 point lift arm. What I meant was to raise and lower the lever and observe the pressure in the gauge to see if it changes.
When the oil comes out of the spool valve does it appear to have a lot of pressure. Having oil coming out of spool and not registering any pressure means all of the oil is diverted to diffy and points at some defective element within your spool. i never took my spool valve apart to give you guidance there.
I have another crazy idea, on your second picture the hole on the lift cover with the o-ring is pressure port or oil port going to 3 point lift cylinder head. why don't you get an rubber tipped air nozzle to see if you can push any air in to the oil passage way. while you are doing that have someone raise and lower the position control lever. I am hoping something is stuck there and yo might be able to push it out.
Pressure is made when oil flow from the pump hit the pressure regulator spring against the poppet valve. so if the spring pressure is not enough or adjusted in enough that may not allow a lot of pressure made. Turning the screw on the outside of the relief device increase the spring tension hence more pressure. Might want to turn the adjustment screw clockwise a turn and two and see if you can read any pressure at the gauge.
I wish there was easy way to put a pressure gauge between the pump and the relief device to see if your pump is actually making any pressure.
let me know, we should solve this problem one way or another, it is getting ridiculous
PS. Pt your rubber tipped air nozzle in the hole and put air in and the manipulate the lift arm.
You can also take off the pressure regulator cover off and see if yiu can get some air coming out of that fitting. I am trying to establish if the oil path is open. Second picture on post #41. see if any air comes out of the fitting.
