Backhoe Kubota K-550, K-600, K-650 or L650 Backhoe with a three point hitch attachment.

[handymansvs]

I have just acquired a Kubota K-650,K-550, K-600, or L-650 three point attaching backhoe. It is my understanding that Kubota in the late 70's and early 80's had these backhoes made for them by a manufacture here in the states and sold them as an option for their early L185, L245, L175, and L225 series tractors. I have tried several Kubota Dealers and was told that Kubota is basically not recognizing this as a Kubota backhoe. They are claiming they have no supporting records or manuals for it. I have been lucky enough to acquire parts manuals for the earlier models of the backhoe which give what seems to be a fairly accurate parts breakdown and list.

However, both of my parts booklets make reference to a "Three Point Limiter" and a "Three Point Limiter Cylinder". The backhoe I purchased does not have one. I have not been able to find any reference to it's purpose, where it goes, and what it connects to on the backhoe unit. I did notice that neither breakdown of the mounting frame shows the curved two inch pipe that connects close to each of the lifting arm attachment points. I am thinking that the connecting pipe was a later model improvement that eliminated the need for the Three Point Limiter apparatus.

I would appreciate any help or information you may have or know about this three point limiter apparatus.

Thank you,
Benjamin J. "Joe" Browning
handyman@iinet.com

 

[art]

I believe those backhoe's were built by Arps and you did need the limiter. Some actually were quite primitive and just secured the drawbar with a chain to limit the amount of freedom the backhoe had to move up and down. Others used a rigid top link in later builds.

 

[B8200er]

I have just acquired a Kubota K-650,K-550, K-600, or L-650 three point attaching backhoe. It is my understanding that Kubota in the late 70's and early 80's had these backhoes made for them by a manufacture here in the states and sold them as an option for their early L185, L245, L175, and L225 series tractors. I have tried several Kubota Dealers and was told that Kubota is basically not recognizing this as a Kubota backhoe. They are claiming they have no supporting records or manuals for it. I have been lucky enough to acquire parts manuals for the earlier models of the backhoe which give what seems to be a fairly accurate parts breakdown and list.

However, both of my parts booklets make reference to a "Three Point Limiter" and a "Three Point Limiter Cylinder". The backhoe I purchased does not have one. I have not been able to find any reference to it's purpose, where it goes, and what it connects to on the backhoe unit. I did notice that neither breakdown of the mounting frame shows the curved two inch pipe that connects close to each of the lifting arm attachment points. I am thinking that the connecting pipe was a later model improvement that eliminated the need for the Three Point Limiter apparatus.

I would appreciate any help or information you may have or know about this three point limiter apparatus.

Thank you,
Benjamin J. "Joe" Browning
handyman@iinet.com

===================================

I have a Kubota K-550 backhoe (5.5 foot digging depth) with the original heavy duty top link that I am mounting on a Kubota B8200. It has the Three Point Limiter Hydraulic Cylinder mounted on it.

The shaft end of the cylinder attaches to the heavy duty 3-point hitch top link close to the tractor's top link bracket.

The other end of the cylinder attaches to the center of the backhoe frame at the very bottom. Therefore the cylinder points up from the bottom of the backhoe frame towards the back of the tractor at "about" a 45 degree angle.

This cylinder is single action, i.e. it only has one hydraulic port, and can only forced by hydraulic fluid to extend the shaft. The hydraulic hose attached to this port simply goes directly to a "tee" in the hydraulic source (pressure) hose that provides hydraulic fluid flow (powers) the backhoe.

The way it works is this: If the backhoe is just sitting there doing nothing, the hydraulic fluid simply flows through the source and return lines at low pressure, and the limiter cylinder sees virtually no pressure. In this case you can raise/lower the backhoe with the 3-point hitch mechanism and the limiter cylinder will not resist. If you are using the backhoe and apply down pressure to dig, the pressure rises in the hydraulic source hose and the limiter cylinder extends, pushing the rear of the tractor up and the backhoe frame down.