I have finally put all of my 8N hydraulics back together. The lift had stop working entirely. For the longest time, the only way the lift would go up is by having the quadrant lever all the way up and push down on the draft control lever. Then, about this time last year, it stopped working all together. With help from people from this board, here is what I did:
1. Replaced the relief valve
2. Dropped pump and removed the valves and cleaned entire sump and pump.
3. Straighten one of the valve guides that had gotten bent.
4. Replaced the three rings on the cylinder piston
5. Honed the cylinder before replacing the rings
6. Replaced the cam follower pin.
When I had everything a part and had replaced the pin, I noticed that so much of the linkage was worn out, I am not sure how much contact the pin is actually having with the pin.
Now the pump works in that it will lift the implement VERY slowly. But, I still need to press down on the position control lever to get the lift to work. Before, even though I was pushing down on the position control lever, the implement would go up quickly. I adjusted it the best I could with the directions in the manual and the quadrant is pushed all the way towards the rear of the tractor as it can get. It also leaks down much faster then before. I thought the exhaust valve might be stuck open but when you lower the quadrant it drops quicker then when it just leaks down. The piston and cylinder which I thought were in great shape with not a lot of scratches and certainly no gouges I thought would be fine with just replacing the rings. So, the lift is working, but not great. I can get through the winter and then get back into it in the spring. So now my questions are:
1.Does it take time for the rings to set or "break in" to seal the piston in the cylinder?
2 Could the lift be very slow cause the valve is barely open because of the adjustment? Also, could this adjust effect the leak down.
3. If the linkage is so worn that the cam pin is not following the cam, is there any way to really adjust the linkage to make it work?
4. What would cause the lift to go up slowly.
I realize I will be going back into this system when the weather breaks cause I would really like to have one that works at least a little better then this.
1. Replaced the relief valve
2. Dropped pump and removed the valves and cleaned entire sump and pump.
3. Straighten one of the valve guides that had gotten bent.
4. Replaced the three rings on the cylinder piston
5. Honed the cylinder before replacing the rings
6. Replaced the cam follower pin.
When I had everything a part and had replaced the pin, I noticed that so much of the linkage was worn out, I am not sure how much contact the pin is actually having with the pin.
Now the pump works in that it will lift the implement VERY slowly. But, I still need to press down on the position control lever to get the lift to work. Before, even though I was pushing down on the position control lever, the implement would go up quickly. I adjusted it the best I could with the directions in the manual and the quadrant is pushed all the way towards the rear of the tractor as it can get. It also leaks down much faster then before. I thought the exhaust valve might be stuck open but when you lower the quadrant it drops quicker then when it just leaks down. The piston and cylinder which I thought were in great shape with not a lot of scratches and certainly no gouges I thought would be fine with just replacing the rings. So, the lift is working, but not great. I can get through the winter and then get back into it in the spring. So now my questions are:
1.Does it take time for the rings to set or "break in" to seal the piston in the cylinder?
2 Could the lift be very slow cause the valve is barely open because of the adjustment? Also, could this adjust effect the leak down.
3. If the linkage is so worn that the cam pin is not following the cam, is there any way to really adjust the linkage to make it work?
4. What would cause the lift to go up slowly.
I realize I will be going back into this system when the weather breaks cause I would really like to have one that works at least a little better then this.
