Machine was working fine then suddenly as if someone flicked the switch to stop pumping it stopped. It would not forward pump only reverse pump so using the manual over ride I emptied the load of concrete and got back to the workshop. After some basic trouble shooting I replaced the solenoid for forward pumping which is on the lever chest in the side locker. This fixed my problem (or so i thought) and I pumped out 1000l of water in the yard just to make sure I was good to go. However today I arrived onsite set up the pump, primed out with jelly and pumped 0.5m3 of concrete and same problem again.

Anyone with a similar experience? Im beginning to think its the actuator which the solenoids are bolted too?

Did you call Schwing, they are normally really good at helping people. 

Please call the Schwing tech support line at 1-888-SCHWING and we can assist with your issue

You were right to go to solenoid but checking solenoid doesn't give certain answer it just narrows it down to less possibilities. So realistically its going to be either proximity switch, solenoid coil, the plug socket that the solenoid it connected to, the breaker or fuse behind panel for forward pump directional valve, and lastly buildup in swing tube. start with changing or overriding each of these eliminating options as you go and you will wind your problem. each of these parts work together in order to pump so if one is out, you can't pumping without overriding or changing. sometime process of elimination is most efficient.

while waiting for a second truck i shut the pump off. go to restart it would turn over but not fire up. 

after going to the duetz shop they discovered the large twist lock wiring harness came lose.

some times its really simple but it takes a second guy to check it out.