CK30 Front end loader not lifting heavy loads

[4570Man]

If bad cyl seal the rod piston will pass through the oil with the oil going around the piston’s seals. Don’t need external leak for piston to pass through the oil if the piston is not sealing to cyl walls.

I used to be of the same belief but that’s incorrect. The barrel is completely full of oil and you’re trying to stick a rod in which displaces more oil. It can’t happen without pushing oil somewhere. Demonstrate your theory by filling a glass completely full of water and sticking your hand in it without spilling any. Hint it’s going to end with a wet counter.

 

[MichiganIron]

Do the leak down test. This test will indicate bad cylinder seals. Due to the volumetric difference between the piston and rod sides of the cylinder, the test will show bad seals. We do this test always as our first step for trouble shooting lifting capacity problems. 9 times out of 10, it is bad cylinder seals.

Just saying...

 

[4570Man]

Do the leak down test. This test will indicate bad cylinder seals. Due to the volumetric difference between the piston and rod sides of the cylinder, the test will show bad seals. We do this test always as our first step for trouble shooting lifting capacity problems. 9 times out of 10, it is bad cylinder seals.

Just saying...

Your test is a lot of work and wouldn’t work. Lift the front end of the tractor up instead. If the seals are leaking it will allow the tractor to leak back to the ground pretty rapidly. Doing the test your way fluid must be displaced which it can’t be.

 

[MichiganIron]

This is the KIOTI Techincal recommended test for lack of lifting performance. We do it all the time, works great. The front and back side of a cylinder has a volumetric difference due to the rod that WILL allow fluid to escape from one side of the cylinder to the other if the seals are bad.

We're just trying to help. This is America...we can all decide what we want to believe......

 

[4570Man]

This is the KIOTI Techincal recommended test for lack of lifting performance. We do it all the time, works great. The front and back side of a cylinder has a volumetric difference due to the rod that WILL allow fluid to escape from one side of the cylinder to the other if the seals are bad.

We're just trying to help. This is America...we can all decide what we want to believe......

Leaking piston seals will no doubt make the loader leak down faster. A lot less fluid has to leak past the valve that way and it’s under higher pressure. But with all the hoses unplugged it would stay up forever unless it’s leaking fluid on the ground somewhere. Visualize the simpler picture with just a bucket of water that’s filled completely full. Now stick your arm in it without spilling a drop. Hint your arm is going to displace water and push it over the sides and spill it.

 

[MichiganIron]

Not true...the fluid will just displace one side of the piston to the other. We aren't adding any displacement.

Best of luck

 

[4570Man]

Not true...the fluid will just displace one side of the piston to the other. We aren't adding any displacement.

Best of luck

The rod displaces fluid. The other side of the cylinder is already full. You’re attempting to push the rod into a container that’s already full and won’t compress without spilling fluid. It can’t happen.

 

[Amvcane]

What is the theory of operation of a check valve on a hydraulic top link?

 

[MichiganIron]

The rod displaces fluid. The other side of the cylinder is already full. You’re attempting to push the rod into a container that’s already full and won’t compress without spilling fluid. It can’t happen.

Wonder why backhoes will leek down all the way to the floor if left on the stabilizers after removing them from the tractor ??

 

[4570Man]

If there was no leaks they wouldn’t. You said yourself there’s a volume difference. You’re trying to shove a larger container into a smaller container. How’s it gonna fit? A cylinder can extend like the stabilizer leaking down because the rod is moving out of the barrel and the volume inside the cylinder is decreasing. The rod cannot move into the cylinder.