Cat th220B no boom functions

eomachinery

Member
Livestock Farmer
Hi All we have a cat th220B which has lost its boom (joystick functions) red exclamation light flashing on the dash. It did this a couple months back and we bypassed the hydro/joystick cut off switch in the rear right hand corner. It worked for a while but has since stopped again,
Does anyone know if there is a relay involved in this circuit (checked all fuses) and which solenoid is the main pilot cut off one? And other info also greatly appreciated. Thanks.
 
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boom

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