Stevesequip
Member
Hello I have been working on a ex120-3 for the past 3 months and cannot figure out the route of the issues. I have the manual for the machine and have worked on others in the past. What I understand with these machines is serious electrical problems in the harness bein and fault out all sensors and computers. This machine started out with a very slow hydraulics problem. After poking around I found the problem was in the main harness. Got the machine to my shop and replaced the harness. This took care of the slow function problem but an entirely new problem came up. As many times with these machine the biggest problem they seem to have is this stalling when any function is bottomed.
Here's what I have done to remedy this since then.
Replaced with genuine hitachi parts
- MAIN WIRING HARNESS
- CAB WIRING HARNESS
-PVC COMPUTER
- EC COMPUTER
- ANGLE SENSOR
- DP SENSOR
- SPEED SENSOR
- PUMP PRESSURE SENSOR
The only things not replaced is the two high speed pump SOLENOIDS due to being replaced about a year ago by John Deere dealer. I did test them multiple times as well to be sure they test to the spec in the book and they check out every time, I also have disassembled them to check the internal parts and could not see any damage.
If someone has any other ideas I would really really appreciate any help.
Thanks for reading.
Here's what I have done to remedy this since then.
Replaced with genuine hitachi parts
- MAIN WIRING HARNESS
- CAB WIRING HARNESS
-PVC COMPUTER
- EC COMPUTER
- ANGLE SENSOR
- DP SENSOR
- SPEED SENSOR
- PUMP PRESSURE SENSOR
The only things not replaced is the two high speed pump SOLENOIDS due to being replaced about a year ago by John Deere dealer. I did test them multiple times as well to be sure they test to the spec in the book and they check out every time, I also have disassembled them to check the internal parts and could not see any damage.
If someone has any other ideas I would really really appreciate any help.
Thanks for reading.