racerboy832
Silver Member
I had a pump failure on my mini excavator after about 30 hours of a thumb install.. It may have nothing to do with it but I want to pick a few brains. I have a spare circuit on my spool block that can my plumbed for a hammer or whatever. I only planned on using it for a thumb. I plumbed it from one port to a relief and to the closing side of the cylinder. The relief is tee d back to the tank. The retract side is just plumbed to the other side of the spool.
The reason I put the relief in line was if I grab something and curl the bucket too much is will open the relief before it will bend a thumb cylinder. Also is you squeeze the object it will relief.
Here is my question. If I grab a log and I squeeze it with the bucket and it rolls back the thumb cylinder. It will open the relief. Now it pushes the fluid out of the cylinder to the tank. Now the cylinder acts bouncy till I cycle it a few times. Does this hurt anything? Introduce air into the system or a void of fluid I had the relief set at 1500lbs and excavator runs at 3000lbs.
It may be a total fluke but figured I would ask.
The reason I put the relief in line was if I grab something and curl the bucket too much is will open the relief before it will bend a thumb cylinder. Also is you squeeze the object it will relief.
Here is my question. If I grab a log and I squeeze it with the bucket and it rolls back the thumb cylinder. It will open the relief. Now it pushes the fluid out of the cylinder to the tank. Now the cylinder acts bouncy till I cycle it a few times. Does this hurt anything? Introduce air into the system or a void of fluid I had the relief set at 1500lbs and excavator runs at 3000lbs.
It may be a total fluke but figured I would ask.