Hitachi EX 120-2 Gremlins

Pump angle sensor target voltage spec is 4.40 +/- 0.03 volts. Rash said: Is running at 10.4 mpa likely the reason for overheating?Thanks R Click to expand... Very likely.

Rash said: I assume the next step is to check for air leaks and see if code 29 clears. Click to expand... Yes

Success , wanted to first thank Diesel Dave for his generosity and wisdom helping me repair my Excavator. Couldn't have done it without his help as well as the invaluable resource of information on the HEF. Was able to clear code 29 but was getting code 22 consistent . Had two pump displacement solenoids PDS one old and one new in town and had one old one new on machine on the mountain. Pressure tested the two in town both had a slight bit of air at 120-150 psi and took the new one partially apart and the old one fully apart and wasn't able to get old one back to sealing. Went to mountain and installed new PDS for old one on #1 closest to engine and had improvement the RPM went to 2250 and motor wasn't under load and fluid flow rate went from 200 liter/minute to around 43 liter per minute and pump discharge pressure dropped to 3.1 from range from 10.2.The hydraulic functions were slow but machines wasn't laboring or overheating. Changing the angle sensor by hand did slightly improve performance but still sluggish. I then took the old PDS removed from #1 tested it with air and had slight air leak at 120 psi but then mounted it on #2 away from engine and full power was restored on all functions. I then by hand adjusted the angle sensor where performance was at optimal while digging as moving this made a difference in performance. I believe when I got bushwhacked by small pine tree at pressure sensor where rodent damage occurred I took out PVC hence the flickering red light and not communicating with DR EX if not then with me messing with wire( believe MG 2361 mentioned possibility of PVC damage with key on and disconnecting solenoids or crossing up wire on another thread).Replaced broken high pressure solenoid twice one from John Deere after first failed. Bought new wire harness from Friday Parts and this "does not" fit the EX120 -2 as it is two short and main end is not compatible but was able to cut up and replace new end plugs where rodent damage was. Could be that both old PDS solenoids were good and the PVC and pilot pumps sensor was my problem only and replacing the PDS with Friday Parts new ones which one was defective caused my issue after replacing my PVC? Hope this helps others and know I could have done it without the contribution of members at the HEF of which I am grateful. Cheers R

Good to hear you are up and running !