I’m at a loss here. My ECR145 acts like it has no hydraulic pressure. It has very slow movements and won’t track, swing, boom up/down, or curl in/out. I had the pump rebuilt, the hydraulic oil is brand new and full. All the filters have been changed. I have no engine codes or anything. Has anyone else had this problem before and how did you fix it? The machine has about 6k hours on it. If someone can help me that would be amazing.
Why did you have the pump rebuilt and what exactly was done to the pump and by whom. Was the machine performing the same before you rebuilt the pump? Almost forgot have you tried running it in manual mode and if so did it behave differently?
We hired a hydraulic guy and he thought it was the pump. He took the pump apart and there were some things wrong with it. But after it had been put back together and hooked back up there was no change. It is doing exactly the same thing it was doing before it was rebuilt. Regarding manual mode: The machine won’t do anything at all when it’s put into manual mode. The computer knows it’s been disabled but the hydraulics don’t react what so ever.
I would be concerned what your "hydraulic guy" has done to the pump and machine. These pumps are something you not to just play around with. Being it is a positive control system it requires input from the servo sensors to the VECU and then output to the pump controllers to produce flow to function the machine. In manual mode you bypass this by sending battery voltage/current to the PWM's on the controllers and through resistors on the ground side. The manual mode switch is a common area that can cause issues both in manual and automatic mode. You are going to need servo pressure readings and check for current to the PWM's.
One thing you can do is view the servo pressure sensor values for each function when in service mode as well as the current to the 2 PWM's. But you will still need to verify servo pressure at the gauge tap on the accumulator/valve block and the current actually being sent to the PWM's.
A little more information is always nice. Did this problem progressively get worse over time? Did it just stop all together one day while you were working it? Was it intermittent, before total failure? Did you happen to cut a filter open before having the pump rebuilt? Was any work done to it before this problem, hoses replaced, steam cleaned?
Probably irrelevant to this diagnosis but I’m nearly certain these Volvo’s have Negative control systems.
B series were negative control. C series is positive control up to and including the EC210C That includes the ECR145C and ECR235C And yes it would be very relevant in the diagnosis.