Bobcat CT4045 tractor hydraulic questions

[Meadowbrook Equipment]

I just bought a new BobCat CT4045 and I want to run a supply and return hydraulic line to the back of the tractor to run a backhoe. The loader lines from the loader valve to the distribution valve are marked with red, blue, and yellow. I need to know which of the lines are supply and return. I was wondering if the third line was from the relief? The manual is pretty much useless for these tractors except for the tons of safety information they contain. I would buy the single remote but when they told me the price was $850, I think a couple of hoses tied in series with the loader might be a bit less expensive!
Thanks ahead for your help!

 

[Leejohn]

Show a picture of your loader valve.

 

[Dave M7040]

It would help your understanding if you got used to using the correct terms as it makes finding info much easier.

Look at the first illustration posted which is of a simple hydraulic valve.

The ports are identified P (for pump) which is the flow from the hydraulic pump, T (for tank) which is the flow to the reservoir from the valve which is from moving cylinders and the relief valve.

A and B are the work ports to a hydraulic cylinder.

Rather than focus on the colors, look for letters cast into the body of the valve.

On a loader valve as you describe, there will be 7 hoses. 4 for the loader arm and bucket cylinders, a P, a T and then the important one for your project.

Power Beyond or in some circles called HPCO for High Pressure Carry Over is the port/line that should be used to feed another hydraulic control valve.

Currently, the PB line is likely used to supply the 3 pt hitch.

Valves typically do not come with PB but rather have provision for an optional plug or sleeve to be installed which then provides the PB feature. See attached illustration.

A T port, possibly a T2 port will have a plug that is removed to allow the PB option to be installed.

Compact loader tractors with a backhoe often have a power beyond loop to supply the hoe.

To get into details of this setup, more info is needed on the valve your backhoe will use.

Dave M7040