Knight Sprayer - Pressure Issue

[cattlefarmer123]

We have a 24m 3000l Knight Trailed Sprayer.

Was spraying today, did 50acres with no problems. I was mid way through a field, switched off at the end of a run, went to the next run, put to spray but there was no spray pressure. The ramsay pressure is where it always is (3 bar) and I can increase/decrease this using the switch. When I click spray some spray does drip out of the nozzles but at no pressure. I kept trying and after a while it did build spray pressure but then the same problem kept happening. All filters are clean and everything else seems to be working fine. Any ideas?

 

[Cjm]

I’m not familiar with that sprayer but I’d be looking at the butterfly valve that diverts back to tank getting stuck open

 

[Andy26]

We have a 24m 3000l Knight Trailed Sprayer.

Was spraying today, did 50acres with no problems. I was mid way through a field, switched off at the end of a run, went to the next run, put to spray but there was no spray pressure. The ramsay pressure is where it always is (3 bar) and I can increase/decrease this using the switch. When I click spray some spray does drip out of the nozzles but at no pressure. I kept trying and after a while it did build spray pressure but then the same problem kept happening. All filters are clean and everything else seems to be working fine. Any ideas?

Is the main electric ball valve working, with engine off, but power on, with all the sections turned off can you hear the main on/off cycling when you switch the master on/off.

The dribble you get suggests the section valves are opening, but the pressure in the spray line is just that needed to operate the Laser agitation.

 

[cattlefarmer123]

Is the main electric ball valve working, with engine off, but power on, with all the sections turned off can you hear the main on/off cycling when you switch the master on/off.

The dribble you get suggests the section valves are opening, but the pressure in the spray line is just that needed to operate the Laser agitation.

Yes, I tried the ball valve and you can hear it operating when switching on/off.

 

[Andy26]

Yes, I tried the ball valve and you can hear it operating when switching on/off.

With all the sections turned off?

 

[cattlefarmer123]

With all the sections turned off?

Ah no, I’ll try that in the morning

 

[cattlefarmer123]

Yes, I tried the ball valve and you can hear it operating when switching on/off.

I’ve just tried, when I turn all sections off on the control box (it’s a Muller) and then click spray it automatically turns all of the sections back on.

 

[Andy26]

Assuming it's electric ball valves and not air solenoids, can you locate the main on off valve (it will be bigger than the rest) and get someone to switch it on/off in the cab whilst touching it to feel if it's working.
Are they round or rectangle section valves.

 

[dannewhouse]

A weird one but when our main filters are getting bunged up that's what happens with ours it wont turn on at a random row end, we know its happening as we have had to keep upping the pressure to hold 3 bar, i put it down to lower water in tank just takes a bit more pulling up over the top?

ours is a mounted hardi

 

[ridger]

Would someone have turned main valve from spray to mix