CASE 580D backhoe lacking power to dig

Tinkerer said: 580D's were sold with either a Parker or Hydreco loader valve. Look in the parts book to identify which one is on ur machine. Click to expand... Mine have Parker hannifin

stinky64 said: Also from Messick's website, note orientation of valve, it's mounted sideways, power beyond fitting is on top. Follow my fat finger, think that's your fitting. View attachment 364021 View attachment 364022 Click to expand... Great! Really appreciate the help. Will check it this week

stinky64 said: Also from Messick's website, note orientation of valve, it's mounted sideways, power beyond fitting is on top. Follow my fat finger, think that's your fitting. View attachment 364021 View attachment 364022 Click to expand... Why does the exploded view just show a fitting and not the details of a valve in the housing?

I believe u are right!! I can’t pull that vertical fitting up and out since it hits the floor pan!? Any ideas? Might have to loosen whole control valve mounting bolts as well as some lines. Here are a few pics. I think I see the power beyond valve sleeve thru the fitting I removed. Can you confirm?

stinky64 said: Also from Messick's website, note orientation of valve, it's mounted sideways, power beyond fitting is on top. Follow my fat finger, think that's your fitting. View attachment 364021 View attachment 364022 Click to expand... You are correct sir. Thanks! I read you need a 90 durometer oring. Any idea where you can get these?

Try McMaster-Carr.

Buy once, cry once. Go to Messick's site, look up page in post #7 and look up corresponding part #s for o-rings and be sure to have correct parts the 1st time. Gonna pay dealer price, but don't have to do over again after ordering wrong size or wrong material. If you're confident you can get correct aftermarket rings, have at it, it's your time and money. For reference Google Case 580D hydraulic system diagram, scroll down to Messick's site and 580D hyd. should magically appear, in the right "box" scroll down to category in post #7 and part #s will accompany the diagram. Good luck. EDIT..... Picture in post #7 is for hydreco valve, page 310 is for Parker 2 spool valve, different animal. Carry on. Stinky.

Zoobie said: You are correct sir. Thanks! I read you need a 90 durometer oring. Any idea where you can get these? Click to expand... No one needs to go to a Case Construction dealer to get Case parts. Most any CNH (AG) farm equipment dealer can get Case OEM parts. Their software will show where in the US the parts are located and how many are available.

.... unfortunately, resealing that power beyond wont fix your problem. TIP - The CNH parts book gives you the oring size & duro #14 is a 916 90 duro #15 is a 119 75 duro (70 will do but can fit a 90 if you wish)

Case (CNH) Ag dealer, used to be Lamb and Webster bought about 5 yrs. ago by Monroe Tractor, walking distance from my house, can not order construction parts from that store. Fluids, common wear parts, o-rings, maybe, but territorial, proprietary crap don't flush. Still paying same premium at CNH ag as construction, same bin and part #. The fact that o-rings are still intact makes that fix unlikely, you're already apart, replace them anyway. have you checked system pressure with a gauge yet?

Tinkerer said: No one needs to go to a Case Construction dealer to get Case parts. Most any CNH (AG) farm equipment dealer can get Case OEM parts. Their software will show where in the US the parts are located and how many are available. Click to expand... Yes exactly the same in Australia, rural have AG dealers' only and first attempt they will report "we can't supply Industrial / Construction." Next ask them to source a part # you know in the database. Problem solved, they can supply and surf the inventory as any other.

stinky64 said: Buy once, cry once. Go to Messick's site, look up page in post #7 and look up corresponding part #s for o-rings and be sure to have correct parts the 1st time. Gonna pay dealer price, but don't have to do over again after ordering wrong size or wrong material. If you're confident you can get correct aftermarket rings, have at it, it's your time and money. For reference Google Case 580D hydraulic system diagram, scroll down to Messick's site and 580D hyd. should magically appear, in the right "box" scroll down to category in post #7 and part #s will accompany the diagram. Good luck. EDIT..... Picture in post #7 is for hydreco valve, page 310 is for Parker 2 spool valve, different animal. Carry on. Stinky. Click to expand... I ordered from Messicks. Thanks

stinky64 said: Case (CNH) Ag dealer, used to be Lamb and Webster bought about 5 yrs. ago by Monroe Tractor, walking distance from my house, can not order construction parts from that store. Fluids, common wear parts, o-rings, maybe, but territorial, proprietary crap don't flush. Still paying same premium at CNH ag as construction, same bin and part #. The fact that o-rings are still intact makes that fix unlikely, you're already apart, replace them anyway. have you checked system pressure with a gauge yet? Click to expand... Drained all fluid to replace seal on steering shaft. Can’t check system pressure until reassembly

alrman said: .... unfortunately, resealing that power beyond wont fix your problem. TIP - The CNH parts book gives you the oring size & duro #14 is a 916 90 duro #15 is a 119 75 duro (70 will do but can fit a 90 if you wish) View attachment 364231 Click to expand... UPDATE: father-in-law with Parkinson’s needed me so been idle for a little while . Was able to run a neutral and load system check. Neutral around 150 psi below the 400 max spec. So good there. When I curl the front bucket it hits 2400 psi and goes into bypass. When I curl the backhoe attachment bucket only hits 1500 psi. When I bottom out lifting backhoe boom only hits 1000 psi. Spool valve orings all replaced and new seals in backhoe boom. Going to power wash underside and check boom quick disconnect. Appreciate all the input from all of you guys!

Welder Dave said: I changed the quick couplers on my Cat backhoe for that reason. I heard the couplers can wear and not allow full flow. Mine still worked but the balls were definitely worn with flat spots on them. I had trouble getting the quick couplers apart too but it might have partially been due to I didn't fully relief all the oil pressure. I used Stucchi couplers rated for a higher flow than the machine had. Cat wanted a ridiculous price for the OEM couplers. I got the Stucchi couplers and adaptor fittings for less than what one side of the Cat coupler cost. Cat OEM would have cost close to $500. Click to expand... You and dodgeboy were correct. Check out the return line quick disconnect. Totally shot. Not sure if this is my issue but will replace and see

You and dodgeboy were correct about bad couplings. This was on the return line so not sure if it affected my power to the hoe. Will replace both and see what affect it has

@ stinky64 said: Case (CNH) Ag dealer, used to be Lamb and Webster bought about 5 yrs. ago by Monroe Tractor, walking distance from my house, can not order construction parts from that store. Fluids, common wear parts, o-rings, maybe, but territorial, proprietary crap don't flush. Still paying same premium at CNH ag as construction, same bin and part #. The fact that o-rings are still intact makes that fix unlikely, you're already apart, replace them anyway. have you checked system pressure with a gauge yet? Click to expand... 9-7-26 UPDATE.. @alrman @Tinkerer @Dave Neubert Appreciate all the great help everyone has given me on this issue...still stumped. The latest are the results of the system pressure testing. Need to know the next steps. Pressure gage installed on control block coming from pump as shown in a prior picture. -curl front bucket to stop achieves 2700 psi (both cylinders are leaking and need to have seals/piston seals replaced) -lift front bucket to stop 3000 psi -retract stabilizer arms to stop 3000 psi -curl hoe bucket to stop 2200 psi -pull hoe dipper arm in to stop as well as extend it to stop 1700 psi -lift hoe arm to stop 2400 psi -swing hoe arm left or right 2400 psi Pressure gage installed on steering relief valve per service manual test procedure: -pressure at 200 psi neutral (spec says less than 500 good) -pull hoe dipper arm in to stop pressure drops to 100 psi (one section in manual says it should show 2800 psi, another section says to perform the next test mentioned ) -Per manual, max out steering to left or right should be 2050-2150, mine reads 1700 psi. With steering maxed out, pull dipper arm in, spec. says 2850-3150, mine reads 2200 psi Manual states that if I don't achieve the 2050-2150 when maxing out the steering alone, to adjust the pressure on the steering relief valve. Offhand I did not see anything on valve that would let me do this. Manual states that if I don't achieve the 2850-3150 with steering maxed and dipper arm pulled in then the piston in the steering relief valve may be stuck and to disassemble the assembly and fix. Another section in manual states that if I am not achieving the correct pressures to disassemble the unloader valve. Front bucket pressures seem good so am ruling out the pump being bad. Back hoe pressures low but dipper arm is lowest and this affects my digging. We had just installed new seals/piston seals on the dipper arm so ruling out bad seals. I also tightened the bypass valve on this individual spool for the dipper 1.5 turns and it had zero affect. Any ideas for next steps guys? thanks! BTW I replaced the quick disconnects as stated in a prior post. The return line was very bad, the input line was not as bad but both not good.

The unloader valve only exists on the 580D. It is directly under the steering relief valve. It acts as a priority valve, sensing steering demand & diverting hyd flow to the steering - from the hoe supply. It could very well be your problem.

alrman said: The unloader valve only exists on the 580D. It is directly under the steering relief valve. It acts as a priority valve, sensing steering demand & diverting hyd flow to the steering - from the hoe supply. It could very well be your problem. Click to expand... I will have to disassemble that to see if that may be the problem Thanks! Should I try to adjust the pressure on the steering relief valve first, or disassemble that first?