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Discussion Starter · #1 ·
Ever since starting beans have been unable to get power to master solenoid valve
we ran a jumper from the header valve above it? We also have to run a jumper to the unload auger? We have the wiring diagram, but don,t understand role master valve has ?
Does stack valves open master as a command is given? or is master supposed to run all the time? We cancel out things by lifting header all the way up then lat tilt , rotor , whatever can be adjusted. want to fix this before corn! any help appreciated !
 

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Your description is a little confusing as to where you are getting your power to send to the master solenoid valve.



Here is how the system works. First, before any valve will operate the system needs to see engine oil pressure. The run relay behind the seat grounds itself through the oil pressure sender on the engine, the one with two wires. Main power is supplied by the run relay circuit breaker in the engine compartment. With the engine running the key switch is sending power to the run relay sense circuit. With power at the sense terminal and ground on the ground terminal of the relay, the relay latches and sends power out to a circuit breaker under the console in the cab. From the circuit breaker power splits into two circuits, one goes to the master solenoid relay, also behind the seat, and the other circuit goes to the reel raise, head raise and head tilt switches.



If the run relay is functioning then you will have power at the supply terminal of the master relay also behind the seat. This terminal is the one closest to the back of the cab. If the master relay is not energized and latched, then you should have power to the feeder reverser switch and the auger swing switch. If you press the head raise, reel raise, header tilt, or rotor speed, the master relay is energized and latches. When the relay is latched this sends power to the master valve solenoid.



The feeder reverser and the auger swing do not use the master relay to send power to the master valve solenoid. The power splits after leaving one of these switches with one circuit going to the valve you wish to operate and the other circuit goes to the master valve solenoid.



In all these circuits diodes are used but I do not think the diodes are the problem since you would have had to have multiple failures.



This is where my understanding of your explanation of how you supplied power to the master solenoid valve does not make sense. Are you going from the auger swing valve solenoid to the master solenoid and from the head lift solenoid to the master solenoid, or are you using a 12v supply from some other source for the master valve solenoid..



The master solenoid valve must be activated to send hydraulic flow to the valves above.
 
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