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Building a spray rig
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Follow the process of scrap building a spray rig.
Uploaded by: Rick Tufts
Created: Monday, February 12, 2007


I have removed the wheel set from the spray rig andplaced it on the push trailer for mounting.

I removed the tank and washed it out. It sits in the cool sun to dry out. I am also trying to locate the center of the trailer and it is much easier to do this without the tank.

Adjustments are made and now work begins on tuning the engine.

Well, it is taking shape as I mounted the frame to the push trailer frame, next came the tank and tightening up on the hose clamps.

Now that the engine runs smooth and the pump is set, the tank has been mounted. Next comes new nozzles, extended piping and maybe a bit of wood decking.

The white pipe you see is PVC pipe and is on a spring loaded swivel, so it will flex if brush hits it and spring back in to place afterwards.



This is a 4 inch spring, attached to the PVC boom and mounted to the boom, via a 2 inch long bolt and nut. The spring isn't under any tension until it comes in contact with something.

Here, you can see the folding of the PVC boom. The spring is under a small amount of tension, the boom passes the obstruction and "springs" back in to place. I welded a 2 inch tall, round stock for the boom to stop against once it swings back in to place.

These are the last pictures of the spray rig. It is now complete.

This picture shows the belt driven pump on the left and on the right is an electric valve that I'll use to electrically open and close the spray valve, while I'm operating the car from behind.

I also added lights for warn passing cars on the highway or othermotorcars that might be in front of me.

I have just coupled the MT19 and the spray rig together, hooked up the wiring and have done a test spray. It is now ready to go to work.

I have mixed some Roundup in and am giving a test spray. I found out that the nozzle makes a too fine a mist when spraying. I'll have to step up to a large sized nozzle for next time. Everything worked perfectly though.