Hitachi Ex 100-2 very slow hydraulics

Will do what should I adjust too?

I adjusted it per this method

RPMex said:

I adjusted it per this method

Click to expand...

Interesting, in our Deere manual they have us restart the machine after the DVOM is connected to the harness (step 9). Then wait 3-4 minutes until the voltage stops rising, then make the adjustment while it is still running.

I am afraid your engine has degraded after a period of use!!

That doesn’t sound good.

What would be the solution to something like this?

When I rotated the angle sensor it did make the machine a bit fast(still not near as fast as it should be) but it didn’t stall out. Although very slow it does seem there is some load on the engine.

I noticed when multifunctioning it seemed to come out of it and want to act normal.

I adjusted the angle sensor back to 4.4 and I’m back to code 22 abnormal pump control

Is there a way to fix a degraded engine? Or check it?

It's been a bit but I wanted to conclude the prognosis of this machine. I ended up hauling it into the dealer hoping they would have better news but unfortunately they did not. They started by going over all the electrical which I had already done thanks to help on HEF. They told me the electrical checked out fine, there were no codes, and they replaced the DP Sensor and a pressure sensor which made no change.
They then dug into the hydraulic control valve and unassembled and re assembled looking for contaminations, and nothing was found. Once reassembled and tested they felt it was a bit faster so I was called to come try it out. It was a bit faster but still nothing like it was. Tracking in turtle is pretty much no existent and the boom up is still slow especially when extended out all the way. When multifunctioning it still seems to come out of it and the movements get faster. The machine also tracks better once the hydraulic fluids warm up.
I was told that was about all they could do for the machine as many of the valves and spools are not available new anymore and finding some used in good shape would be next to impossible. Not to mention they were not sure that would even fix the problem because they were not certain what was wrong. They told me my money now would be better spent on a new machine. It is 25 years old so they are probably correct on an upgrade but I'm still bummed to think now this machine is basically useless because it is tight and clean and engine runs great.

I want to give a special thanks to @mg2361 and @LACHAU. Your willingness to take the time to help was huge in so many ways. I learned a ton about this machine and I really enjoy reading down through all the different posts on this site. The knowledge and experience on this forum is awesome and a great tool for anybody wiling and able to tackle their own maintenance work! For now I'm going to look for another digger and keep this one as a shop machine. Below is the dealer write up incase anyone is interested in reading, or has any more insight on what could be wrong. Thanks again!

Dealer write up:
"Tried to bring machine in the shop but the tracks would not move the machine well. you could not turn the machine and even tracking straight it would hardly go over a bump. Tried to pick the machine up with the boom but it would not do it. The dig functions did cycle much better than the tracks. Connected to machine with MPDr, and made sure the dig mode was in general purpose and the travel switch was changing input to the PVC.
The pump angle was around 4 degrees at an idle with no functions activated. When I combined arm, boom, and bucket functions together you could see the angle increase to 23 degrees. Verified that the angle sensor was installed correctly and that the spring clip was still in place and they were. The differential pressure would drop when you activated a function but the dig functions would make it drop more dramatically. Verified that the DP sensor had around .4 volts at the signal wire with key one engine off. Delivery pressure would never reach relief specifications when you held a function over relief. Adjusted the system and surge reliefs up to see if they had any effect but they did not. Inspected seals on system relief but they were intact. Monitored the pump solenoid signals and when you activated a dig function they would increase the pump angle like they should and decrease it when you let off the function. Swapped the solenoids to verify that the results were the same and they were. Unplugged both solenoids and made sure that the pump would increase its angle at a slow rate.
When you activated the tracks the PVS would not try to increase the angle. It stayed at 4 degrees. Disconnected the DP sensor to see if the pump would go to max angle and it did. Tried traveling and the machine would move but almost stalled the engine while doing so. Reconnected the DP sensor and unplugged the pump solenoids. While monitoring the pump angle, I waited until it got to about 10 degrees and activated travel. I was able to get the machine in the shop before the angle became to large and pulled the engine down too much. Reconnected the solenoids.
Capped off the two top travel work ports at the main control valve to see if the tracks would then be able to achieve system pressure. They still would not. Monitored engine RPMs to make sure speed sensing was not effecting the pump and it seemed to be accurate. Activated the tracks when the machine was in auto idle state to see if the pilot sensor was working and the engine returned to high idle. Checked pilot pressure at the top of the propel valve spool pilot caps and had 700 psi with travel activated. Swapped one of the propel spool's pilot lines with the swing function to see if the machine would travel with the swing function activated and it would not. Capped off the proportional solenoid line going to the travel functions compensator to see if I got different results and I did not. Checked the constant reduced pilot pressure and it was 485 psi, a little low but not enough to stop the machine from traveling, especially with the solenoid pressure removed from the equation.
It seemed as though load sense pressure was either not being generated or leaking off somewhere for the propel functions. Removed the travel shuttle valve and examined it. Disassembled the valve and blew it out. Reinstalled the shuttle and found that the results were the same. Swapped travel shuttle with the swing shuttle and the results were the same. Tried swapping the swing and the travel shuttles with the bucket shuttle one at a time. Still had the same results. Removed the number 7 shuttle and disassembled it. Blew it out and examined it. Reinstalled the shuttle and I could now achieve system pressure with the bucket function. The machine could also lift itself off the ground. Travel was still too weak to turn one track on its own. Removed the left main valve pilot cap and removed both travel spools. Could not see anything that stood out about them. Cleaned them off and made sure that they moved easily in their bores. Removed the travel compensator valves. Examined them and cleaned them up Made sure that they moved easily in their bores as well. Reinstalled all removed parts and tried the travel function again. With the top propel work ports capped off the delivery pressure would now increase to 32Mpa (system relief pressure). Reconnected the lines and founds that the tracks could turn the machine. Pump angle was also now increasing above 4 degrees with propel activated and the differential pressure was more dramatic in its drop. Readjusted the pump angle sensor slightly to increase pump displacement. Brought the machine outside and I was able to track slowly around the yard. The machine could not counter-rotate but would turn. Called customer to come try."