Technical
A ground speed governor is standard on the Cushman Truckster
“ 130 I PC JUNE/JULY 2018
A small pin and an old toothbrush should be carried to clean any nozzles that need attention. Never put a spray nozzle in your mouth and blow through it!
for the correct and efficient operation of any sprayer, but unfortunately, they are often the most overlooked part of the machine. The nozzle controls both the spray pattern and the droplet size. They have an operating range and the spray operator must use a selection chart to ensure that the nozzles they are using are actually capable of delivering the required rate at the desired forward speed.
There are plastic, metal and ceramic nozzles available, and the selection is driven by the type of product being applied, how abrasive it is, and how much you are aiming to apply.
Spray nozzles of course wear, and they can also get blocked by partially dissolved chemicals or other debris within the system.
Nozzles can also be easily damaged, causing poor spread or gaps in the spray, leading to streaking. So, they must be checked regularly, and a good operator should be regularly checking the spray pattern to see if there are any issues.
A small pin and an old toothbrush should be carried to clean any nozzles that need attention. Never put a spray nozzle in your mouth and blow through it!
Speed
A critical part of spraying has always been selecting the right speed, and then sticking to it religiously. It is easier said than done, but for those with the base model sprayers it is essential for a consistent application rate. On undulating ground, the forward speed will increase going downhill, and decrease as you climb even a gentle slope, and this, of course, changes the application rate. Hydrostatic drive systems are the most prone to this problem and the only real solution is to use a mid‐range or better sprayer, so the varying speed can be matched to the flow rate (by the controller), thereby giving you an accurate application rate.
Mechanical drive systems are better at holding the forward speed, but they can also vary over undulating ground. One solution is to use a ground speed governor; this mechanical device will reduce or increase the throttle to maintain the engine speed, giving you a constant forward speed. The Cushman Truckster, for example, has always used this system, and it is far more accurate
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