Loader Adjusting the relief valve

[SPARKY978]

Harry, here's my problem. I've got a 1710 with a 770B loader. The loader seems a little weak, It won't raise the front wheels off the ground unless you place it flat on the ground, then use the bucket dump to raise it (kinda cheating). Not sure if this is normal. I recently added a GB 651 backhoe that came with a self contained pump rated at 2250 psi. I removed the pump and reservoir and plumbed it directly into the tractor 3PH hydraulics. The hoe seems to be around 10% weaker, when running off the tractor hydraulics. Now, the tractor hydraulics are specd at 2133 psi. The loader is specd at 1600. I agree, I do need to check the system pressure before adjusting anything, but I didn't want to buy a pressure gauge if adjustment wasn't possible anyway. I have the loader manual and it shows an inline pressure relief valve, but I cannot find it on my setup. I wasn't sure if someone simply lowered the whole system pressure to accomplish this. JC, wonderful schematic on that post. Bill, I didn't realize there was another relief valve for the 3pt. I see that in JC's schematic. So, now that I know it is adjustable, I will pick up a gauge tomorrow. If it is below spec, I assume it will be cause the pump is worn. Is it normal to simply shim up the relief valve, or will the pump need repair?

I would like to plumb my backhoe to my 1710 3PH. Can you tell me how you did yours? Thanks.

 

[mfuller]

Sure! All I did was tap into the 3ph hydraulic circuit at the test port, located just to the right of the adjustment knob under the seat. That will be the pressure port. You simply remove the 1/2" pipe plug and install a female hyd quick coupler. Next you remove the 1/2" pipe plug from the side of the housing (just a few inches aft of the pressure plug) and install a male hyd quick connect. I have attached a couple of pics.
The top one will obviously be the pressure line, and the bottom is the return. You will want to use opposite fittings so there is no possibility of hooking your hoses up wrong and I chose to put the female on the pressure port so I could buy a hydraulic test gauge and simply install a male quick coupler into it to use as a test tool (cheaper than having to purchase another female coupler for the test gauge).
Now, the way to energize this port to operate the hoe is by moving your 3ph control lever to the top just like you would to raise the arms, then you will have to move it sideways to raise it just a little more to that upper most notch on the control assy. This will raise your arms to the upper most position and keep the port pressurized constantly. Don't forget to lower the control arm to de-energize the circuit before you disconnect the hydraulic lines to the hoe when you remove it or you will dead head the pump.
Here are some pics of my setup.

 

[mfuller]

Here are some more pics of my hoe and setup.

 

[SPARKY978]

Here are some more pics of my hoe and setup.View attachment 293325View attachment 293326View attachment 293328

Thank you for the info and the pics.

 

[Nat]

I wonder if there is a simular setup on a tc33da. I want to have an aux outlet on the rear but when I checked at the stealor they wanted 1315.00 for a kit. Can anyone tell me if I can do the same on my tractor? thanks, Nat