I have fixed a leak in the hydraulic piston of my 5310 with 540 loader. I changed the fluid. Now I have a soft brake pedal. I figured I had to bleed the brakes, so after bending a wrench to get to the bleed screw on the left, I have the wife to pump the brakes while she opened and closed the bleeder. the brakes felt good sitting there, but in the test drive, the pedal went smooth again.
I looked at what I could find on my wife’s phone / internet and found instructions to turn the front wheel left and right a couple of times, and then bleed the brakes. That didn’t help either. I put a plastic tube on the bleed screw and ran the other end down into the hydraulic fill tube.
I did the right side, there is not enough room on the left for the tube. There were only a couple of small air bubbles that came out from the right. I noticed that there was not much pressure in the fluid leaking from the bleed screw in the plastic tubing. I would appreciate any advice on what I might be doing wrong.
Ok probably only air in the system. Drive the tractor and get good, warm hydraulic oil. Turn the wheel to the right or left and hold it that way. Warm it up a bit and then go the other direction. Do the same for the loader cylinders. Heat them both ways. That should get all the air out of the system if there is any. Keep pumping the brakes and all that. Then see how the brakes feel. You may have to bleed a few more times. I have had some tractors that take a long time to get good brakes back. So be patient and report back.
Since the brakes are not actuated by the hydraulic pump, but rather the reservoir of the brake valve is simply supplied by the oil from the hydraulic pump, it seems to me a coincidence that the brake system has air “” especially if the pedals do not they were pumped while the hydraulic oil was being changed “”. R&R of the front end loader cylinder seals should have no effect on the air in the brake system.
Did you have the engine running to keep the brake reservoir full during the bleeding procedure? The brake valve housing contains several valves that may not be seated. Have you tried pressing both pedals simultaneously?
It could cause a problem. Not always. When you rebuild a cylinder you put it back without oil and introduce air into the system. Not much but it is there. The use of hydraulics and steering warns the oil and draws any air out of the cylinders and helps with the removal of air from the hydraulic system.
The brake reservoir receives oil from the transmission lube line at the steering valve. Excess oil is vented to the crankcase with the return line. I am not saying that this will fix your problem, but it is something to do. He could have a problem with his final drives or transmission letting the oil pass and not applying the piston.
Air that could have been trapped in the steering and / or loader circuits would be sent to the hydraulic crankcase which would then be vented to the atmosphere but I doubt it would reach the brake valve housing unless the brake reservoir was out of oil or very low on oil.
My experience with 5000 series tractors is limited and I do not have access to an appropriate technical manual. Can you explain to me what limits the pressure in the transmission lubrication circuit that supplies oil to the brake valve reservoir? I have looked at the parts catalog but cannot determine what is limiting the pressure to the brake reservoir. I have determined that it must be a lower pressure due to the hoses being simply clamped in the lines.
Thanks for the scheme. Now I understand much better how the brake valve gets its oil supply.I inspected the brake valve supply lines on the PC but couldn’t determine where they connected to the hydraulic system.He knew that low / no pressure oil was supplied to the brake valve so that the brake valve reservoir would stay full of oil, but could not determine from where.I think this schematic and explanation should help other 5000 series tractor owners if they have brake problems.