Jensen A530di 2006

[treequip]

Thanks Andy,

What's it do? Or how's it work?

 

The black plastic square with the wire (there are 2 in there 1 live 1 earth) is called a coil pack.

 

When the coil gets or looses a voltage the field change and/or an internal spring moves a magnet inside that's connected to the operational part of the valve.

 

In simple terms when it gets a voltage the valve sends pressure to the operation (feed rollers)

 

In the UK, chipper controls need to "fail safe" so the usual default (no voltage) system sends the hydraulics back to tank. When the valve gets a voltage it sends the hydraulics to the operation (feed rollers). Its why you have to press a button to start the rollers on most modern chippers.

 

Chipper owners with a machine problem often look to the wiring under the assumption that they ought to find a live. This will only be the case if the reset button has been pushed.