Boom pipes fouling the fan/spray pattern are again a fail item but require just a simple fix, most likely with a plastic tie.
The filling gauze in the top of the tank is missing in the test sprayer, probably why a bottle top became lodged in the suction filter.
There must be a breather in the tank lid and functioning, so that it does not collapse the tank.
Boom guide/protection needs to be in place and functional.
You have to be able to drain the tank is one part of the test, a pass in this case! Pull the release cord at the top of the tank and away with the water.
The existing jets on the test sprayer were replaced with new one-piece units now found throughout the industry.
With everything else checked and corrected as required it was time to perform a nozzle check. Eddy did this with a special nozzle testing unit which allows him to test each nozzle in just 5 seconds as opposed to 30 seconds with a jug. The information from the device can be downloaded and printed out on a graph afterwards.
The Hardi 4110-20 nozzles should apply 1.6 litres/min at 3 bar, tolerance is again + of – 10% per nozzle. The nozzles on our test sprayer were putting out 35.18% more than th
Eddy checked the transverse distribution of each boom section with this device. Essentially he was checking that the pressure at the end of each boom section was the same as the sprayer’s pressure gauge read out. The tolerance for this test is + or – 10%. If it fails Eddy explained, “There may be a blockage in a pipe to give the drop, a leak would be seen and would not cause such a significant drop.” Another element of this test is to ensure that there is visible agitation in the sprayer
Before carrying out any test on the sprayer boom the duo checked that each section of sprayer boom was ‘balanced’ when another was switched off or on. This was checked by simply observing the pressure gauge when operating at 3 bar and observing if the pressure changes when doing so. To correct, simply turn the valve under the relevant section as in the picture to correct or ‘balance’ the offending section or sections.
The chemical induction bowl was checked for operation as part of the test. If an induction hopper is fitted then everything has to work the lads explained; induction and bottle wash. All worked but there was a leak at the junction beneath the hopper. This was again repaired with a flat seal form the vans stock before carrying on with the test.
When testing our sprayer, at 0-bar ours was pumping just 85 litres/min; it should pump 115 litres/min. The pulsing mentioned earlier indicated to the testers that there is air getting into the system and maybe an obstruction. Opening the sprayer’s suction filter revealed the seal of a sprayer bottle in the filter plus the O-ring sealing the filter unit had perished to the point it snapped when being inspected.
The filter was cleaned and a new O-ring fitted from the stock of seals on-board the
The benefit of the test unit was evident when it was plumbed into our sprayer and its gauge showed that the pump was ‘pulsing’ and air could be seen in the water passing through unit’s inspection tube. In other countries, the pump should be capable of maintaining 90% of it pumping capacity at maximum pressure. It is expected that the Irish sprayer pump test will require the pump to be capable of producing the maximum pressure for the jets being used. For example: 5-bar for Hardi 4110-20 je
This is the most expensive piece of test equipment that the Lynch’s have on-board. It allows them to test the sprayers pump plus monitor the liquid passing though it via a clear section of pipe. Such a sophisticated piece of equipment will not be required for the Irish sprayer test but John explained, “This unit allows us to test the pump in a more in-depth way and is a useful diagnostic tool for problem pumps.”
Here John has fitted a new PTO cover on the sprayer unit as a matter of safety before the sprayer is operated. “We have to climb in and around the front of the sprayer when we are testing so we insist that all guarding is in place both on the tractor and PTO,” he said. The cover fitted is a split design unit which allows it to be fitted without having to remove the PTO shaft. The Hardi pump has a tapered shaft and can be extremely difficult to remove, according to John, so they carry both f
An important part of any sprayer is the pressure gauge and Eddy removed this to check it against a calibrated Master test gauge on a special rig. Before the gauge even got that far it had failed because it’s scaling is not good enough. Eddy explained that a filed sprayers gauge needs to show every 0.2 bar on its scale. A new gauge was put through the calibration test before being fitted. The gauge was checked at every 1-bar increment up to 5-bar and again back down as the pressure is reduced.
Eddy and John Lynch from Suir Sprayers – Sales and Testing, Passage Cross, Dunmore Road, Waterford kitted out and ready to test a battle-weary 12-metre, 800 litre Hardi sprayer.
This leaking ram is not a fail but could cause problems with boom control so would be advisable to correct.