DJCohenour
New member
Good afternoon gentlemen,
New member and first post. I am impressed with the amount of knowledge in the hydraulics forum. I have posted this question in another forum with no luck. So, here goes:
I recently had to do some transmission work on my 88 model JD950 with FEL and backhoe attachment. I won't bore you to death with all of the details but, I had to split the machine, had the rockshaft housing removed, and had the diverter valve removed. I have the diverter valve and hydraulic line setup off of a 1050. How that happened I do not know.
Anyway, before reassembly, the hydraulic sump and suction screen were cleaned, a new filter was installed, and a nice $60 worth of JD low viscosity hydraulic oil was added. After reassembly, the 3PH and FEL work as smooth as silk with lots of speed and power.
The problem: I now have no power steering. It worked great before the other work was started. Now, I have no power assist initially. I turn the wheel until I hit resistance, hold the wheel there, and I will get a little power assist in about 10 seconds. This assist is only about 25% of normal. The entire time the wheel is being turned, there is a little engine RPM draw down, not bad though, and I can here the pressure relieve valve doing a little howling.
What I know: as stated above, the sump was cleaned, a new filter was installed, and new JD hydraulic oil was used. I thought at first I picked up a piece of dirt in the power steering lines and it was pushed into the PS control valve so I removed the lines and back flushed the control valve with compressed air. Started the tractor and no change. I then unhooked the hydraulic lines from the diverter valve and tried back flushing it compressed air with some success. I then reassembled the lines, started the engine, and no change.
Do any of you gentlemen have any experience with this diverter valve or have any suggestions? I want to pull the pressure relief valve out of it and continue flushing/washing the unit out, but I am afraid of messing it up completely. There is also a large "nut" on the back of the unit that will unscrew. I have not taken it out for fear of damage.
I had a few hours to work on the machine Sunday afternoon. I took all of the hoses off of the power steering control valve and cleaned it out. I put everything back together and no change. I then unhooked the pressure line going to the power steering valve and cranked over the engine a few times (didn't start it). There was barely a trickle of fluid coming out of that line.
I then determined which lines coming off of the diverter valve are supposed to have pressure using some very small flow diamgrahms in the service manual and deductive reasoning. Then I unhooked the other line that is supposed to have pressure coming off of the diverter valve, cranked the engine over a few times, and lots of fluid comes out.
The problem, I think, has to be in this diverter valve. It also contains a pressure relief valve according to the service manual. There is also a large "nut" on the side of this thing that will unscrew, but I am afraid of messing with on account of screwing it up.
I am now looking for a breakdown diamgrahm of this diverter valve so that I can take it off and apart for a cleaning. It is shown, greyed out, in the diamgrahms on JDparts.com but there are no part numbers or anything listed for it. It is acting to me like the pressure relief valve is stuck closed and not letting any fluid go to the power steering.
I will get this problem whipped. It will not beat me.
Ahhh, the joys of tractor ownership.
I really am at a loss as to what else to do. Any suggestions?
New member and first post. I am impressed with the amount of knowledge in the hydraulics forum. I have posted this question in another forum with no luck. So, here goes:
I recently had to do some transmission work on my 88 model JD950 with FEL and backhoe attachment. I won't bore you to death with all of the details but, I had to split the machine, had the rockshaft housing removed, and had the diverter valve removed. I have the diverter valve and hydraulic line setup off of a 1050. How that happened I do not know.
Anyway, before reassembly, the hydraulic sump and suction screen were cleaned, a new filter was installed, and a nice $60 worth of JD low viscosity hydraulic oil was added. After reassembly, the 3PH and FEL work as smooth as silk with lots of speed and power.
The problem: I now have no power steering. It worked great before the other work was started. Now, I have no power assist initially. I turn the wheel until I hit resistance, hold the wheel there, and I will get a little power assist in about 10 seconds. This assist is only about 25% of normal. The entire time the wheel is being turned, there is a little engine RPM draw down, not bad though, and I can here the pressure relieve valve doing a little howling.
What I know: as stated above, the sump was cleaned, a new filter was installed, and new JD hydraulic oil was used. I thought at first I picked up a piece of dirt in the power steering lines and it was pushed into the PS control valve so I removed the lines and back flushed the control valve with compressed air. Started the tractor and no change. I then unhooked the hydraulic lines from the diverter valve and tried back flushing it compressed air with some success. I then reassembled the lines, started the engine, and no change.
Do any of you gentlemen have any experience with this diverter valve or have any suggestions? I want to pull the pressure relief valve out of it and continue flushing/washing the unit out, but I am afraid of messing it up completely. There is also a large "nut" on the back of the unit that will unscrew. I have not taken it out for fear of damage.
I had a few hours to work on the machine Sunday afternoon. I took all of the hoses off of the power steering control valve and cleaned it out. I put everything back together and no change. I then unhooked the pressure line going to the power steering valve and cranked over the engine a few times (didn't start it). There was barely a trickle of fluid coming out of that line.
I then determined which lines coming off of the diverter valve are supposed to have pressure using some very small flow diamgrahms in the service manual and deductive reasoning. Then I unhooked the other line that is supposed to have pressure coming off of the diverter valve, cranked the engine over a few times, and lots of fluid comes out.
The problem, I think, has to be in this diverter valve. It also contains a pressure relief valve according to the service manual. There is also a large "nut" on the side of this thing that will unscrew, but I am afraid of messing with on account of screwing it up.
I am now looking for a breakdown diamgrahm of this diverter valve so that I can take it off and apart for a cleaning. It is shown, greyed out, in the diamgrahms on JDparts.com but there are no part numbers or anything listed for it. It is acting to me like the pressure relief valve is stuck closed and not letting any fluid go to the power steering.
I will get this problem whipped. It will not beat me.
Ahhh, the joys of tractor ownership.
I really am at a loss as to what else to do. Any suggestions?