Relieve Boom Pressure

N116940-UN-02APR15

A - Message

IMPORTANT: Use of the Boom Pressure Relief function is not recommended when using non-John Deere after-market solution system equipment. These include but are not limited to, direct injection and section control systems. Use of the Boom Pressure Relief function with non-John Deere solution systems may have undesired effects.

The Boom Pressure Relief function allows the pressure trapped in the boom to be bled off after spraying is complete. The pressure is bled off by allowing the boom sections valves to be opened for approximately 3 seconds after the solution pump and remote load are shut off. It is recommended that the operator raise the boom center frame to its highest position. The solution pressure must be 4 psi or less and the engine is running for function to operate. The operator must press the Master Spray ON/OFF button to activate the function. After the 3-second period, the boom section valves will close. The main purpose of this function is to minimize the possibility of the sprayer nozzle bodies leaking while in transit.

NOTE: See Enabling Boom Pressure Relief in SprayStar section to enable/disable this function.

Relieving boom pressure with boom folded may result in machine being covered in solution.

1. Set Solution Pump ON/OFF switch to the OFF position.

2. Unfold boom.

3. Position boom low to minimize drift of solution.

4. Press Master Spray ON/OFF, after pressing Master Spray, the operator should hear an audible alarm and see the message “Boom Pressure Relief” (A) displayed.

5. Repeat step four as necessary; this can be done as long as the conditions in steps one through three are met.

   NOTE: Engine must be running to activate Boom Pressure Relief function. If alarm does not sound and no message appears, wait five seconds and press Master Spray ON/OFF again. Solution Pressure must be below 4 PSI before Boom Pressure Relief operation will be allowed

   If machine is equipped with John Deere direct injection Boom Pressure Relief will not perform its original function of draining pressure back to solution tank due to the presence of a check valve at the mixer module. The pressure will be drained down to the cracking pressure of the nozzle bodies by spraying out of the nozzles.