Posted by Kurt-NEPA on March 13, 2012 at 10:45:09 from (97.167.47.154):
In Reply to: Ford 600 hydraulics posted by BobW on February 29, 2012 at 10:32:52:
I got to thinking after I posted early this morning, and that's a dangerous thing at my age. I may not fully understand what you have done so far. This is what I think the situation is.
Symptom: With the tractor running, moving the Touch Control Arm up and down does not result in any motion of the lift arm.
What you have done.
1. Taken the piston pump apart and verified that the piston and spring are in good condition.
2. Removed the top cover and replaced the main piston O-ring and back up washer. Installed new top cover O-rings and new top cover gasket.
Symptom is still the same.
From here I would go back to basics first. Hydraulic systems are very simple, its the valving that's complicated on the 600/800 series tractor. So lets check the basics first before you take anything else apart.
There are three basic parts of the hydraulic system. 1. Pump, 2. Valves, 3 Slave cylinder (piston). The pump and cylinder is what I would check first.
1. Testing the pressure at the test port is good starting point. You can also test the pressure at the bleeder port of the pump. Pressure should be about 2000 psi.
2. Check for pump prime. From the pump bleeder port, convert to a barbed fitting and run clear plastic tubing back to the hydraulic oil fill port. Start the tractor and watch the oil run through the tube. If no oil is moving, or if there are bubbles moving along the tubing, you have a pump problem. Stop the tractor and replace the plug.
3. Check the main cylinder for leaks, Remove the PTO lever cover (round cover under the seat on the left side). Put some weight on the lift arms. Start the tractor and take a look inside. You can see the back side of the cylinder. If oil is flowing there you have a leak.
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