# Sprayer calibration tools, repairs, rinsate and cleanout checks URL: https://leafwrit.com/us/sprayer-parts-repair/ Reviewed: 2026-10-29 ## Pump sprayer nozzle replacement: identify parts and verify the repair Before ordering a replacement pump sprayer nozzle, identify the sprayer model, wand, shut-off and nozzle arrangement. For example, Chapin’s adjustable poly cone nozzle, part **6-6003**, adjusts from a stream to a cone and fits the models listed by its manufacturer. Check your exact model before ordering. ### Describe the fault before choosing the repair Write down the symptom in observable terms: an uneven pattern, leakage after releasing the trigger, failure to build pressure, an apparent restriction or a damaged fitting. Check pressure and pattern separately from gun leakage, which can involve the check valve, hose or gun. ### Match the replacement to the actual assembly Part **6-6003** is a replacement poly adjustable nozzle for compatible lawn and garden sprayers with a poly wand and shut-off. Model **20000** is among the listed sprayers. Use the product manual or manufacturer’s technical support to resolve fit and chemical-compatibility questions. ### Distinguish adjustable heads from fixed spray tips The Chapin example changes from a straight stream to a cone pattern by twisting the adjustable nozzle. That physical adjustment is different from selecting a fixed tip's specified output and pattern. Tell the supplier which type of head you are replacing. ### Inspect the surrounding system Check nozzle flow with water for wear, plugging or damage. Inspect holders for bending or misalignment and strainers for debris restricting flow. Include the holder and strainer in the repair assessment. Wear-resistant materials such as tungsten carbide, ceramic and hardened stainless steel help nozzles hold a constant flow rate over a long period. After 50 hours of spraying, a brass nozzle can show a 10 to 15 percent higher flow rate, while a hardened stainless steel nozzle rises only about 2 percent. ### Check hoses, fittings and supports Inspect hoses for wear, kinks, looseness and sagging. Chemical residue around fittings can indicate leaks. Check fittings for cracks and looseness, then obtain the machine-specific replacement specification from the supplier. ### Assess a replacement tank by more than capacity Inspect tanks for cracks, rust and corrosion and check that fastenings are secure. Check any protective lining for damage before deciding whether the tank can remain in service. Pump seals, O-rings or cup washers of leather or synthetic material may dry out and shrink if the sprayer has not been used for an extended period or was stored improperly. ### Plan cleaning and service together Pesticide residues left in equipment can expose repair staff and harm a later crop. Follow product-specific cleaning directions and manage rinsate according to labeling. Give the repairer the machine’s recent treatment history. ### Measure the result after replacement Inspect equipment before calibration. Clean or replace components when pressure or pattern is unsuitable, then test nozzle flow with water. Check the repaired system under its intended operating conditions. ### Check the pressure gauge and flowmeter Check the pressure gauge’s condition and calibration. Arrange flowmeter calibration with the dealer or rate-control supplier. Investigate the measuring system alongside the nozzles if indicated and observed output disagree. ### Weed sprayer nozzle replacement: match the whole assembly For weed sprayer nozzle replacement, record the sprayer model, nozzle body, cap, seal and existing tip reference. Ask the supplier to confirm the replacement nozzle against that assembly and the intended spray pattern. Use the inspection and water-test checks above before returning the repaired sprayer to work. ## Sprayer cleanout record and rinsate planning checklist Before cleaning pesticide sprayers, gather the product’s cleanout directions and equipment manual, and plan how to handle rinsate. Check for dried deposits and residues in overlooked components. Record the completed cleanout against the machine and the previous load so the next job has a clear starting point. ### Follow the product's cleanout directions Labeling defines how a pesticide is handled and used. Keep the actual directions with the cleanout job; do not substitute a familiar cleaner or a recipe copied from a different formulation. ### Choose the work location and handling instructions Clean where spilled rinsate cannot contaminate water supplies or other crops and where children and animals cannot enter. Plan the cleaning location, access and possible routes for spilled rinsate together. Identify the actual pesticide and cleaner protection instructions for the person performing the task. ### Include the full liquid path Clean tank interiors and exteriors, nozzles, screens, strainers and hoses. Inspect the inside top surface and irregular internal areas for remaining deposits. Locate each component using the equipment manual. ### Keep the rinsate decision specific Rinsate contains pesticides. Reuse it as diluent only when safe and compatible, without strong cleaning agents such as bleach or ammonia. Use the waste-pesticide disposal route for material that cannot be applied to a labeled site. ## Sprayer calibration tools: what to measure and what to bring For calibration, bring a nozzle-flow tester or measuring vessel, a timer, a tape measure and a pressure gauge. Calibration needs nozzle flow, travel time, treated width and pressure measurements. Measure nozzle flow by timed water collection or a spray-tip tester. Neither observation by itself supplies every input for application rate. ### Identify the quantity the tool reports Choose the broadcast, band or row procedure in [Georgia’s calibration method](https://extension.uga.edu/publications/detail.html?number=C683). Use nozzle spacing for broadcast, band width for a band and row width for a row procedure. ### Find differences across the machine Wear, blockage, damage and hose restrictions can cause erroneous flow. Check pressure along the boom using an accurate gauge and investigate abnormal readings individually. Collect timed output from individual nozzles across the boom and keep each catch result, so differences do not disappear into a combined total. ### Account for hooded and directed systems Nozzles beneath a hood and banded nozzles outside it can cover different areas. Collect individual nozzle output to check uniformity within each group. On the worksheet, record the area covered beneath the hood separately from the directed bands beside it. ### Calculate the application volume A calibration kit should answer several different questions: how far the machine travels, how long travel takes, what each outlet delivers, what pressure it experiences and what width that delivery represents. A single nozzle-flow tester cannot establish all of those values. Calculate application volume from nozzle output, speed and spacing using the appropriate broadcast, band or row procedure. ### Measure travel under representative conditions For the C683 calibration procedure, mark the required distance in a representative field portion. Travel at the intended speed with the relevant attachments operating. Collect output while stationary for that measured travel time at the corresponding operating setting. Keep the operating settings the same when collecting nozzle output. Use a helper for timing if needed. ### When flow differs from the target When flow differs from the target, check nozzle identity, condition, pressure and obstructions before changing pressure or replacing the measuring tool. ### Hose reel for a sprayer tank and Matabi knapsack sprayer parts A hose reel for a sprayer tank holds the spray hose on the sprayer; match the hose bore and the pressure rating to the pump. Matabi knapsack sprayer parts, like the parts of any knapsack sprayer, are ordered by the model name and number printed on the tank or the lance, so write the model down before you order seals, nozzles or a lance. ## Inspect trapped residues and uneven pressure A kinked or sagging hose can restrict flow and trap chemicals. Replace worn hoses and secure loose plumbing before the water test. Clean strainers on the chassis and boom, including any secondary filters that are easy to overlook. Deposits inside one nozzle can create a different pressure from the other outlets on the same rail, producing variation across the boom. Match replacement nozzles to the planned pesticide’s nozzle requirements and the operating speed and pressure range. For mixtures, use the most restrictive applicable nozzle requirement. If the sprayer varies speed substantially, discuss whether its control system can maintain the required flow and droplet characteristics throughout that range. ## Next step Send the model, component markings, photographs and observed fault to the equipment supplier. After repair, complete the [calibration checks](https://extension.colostate.edu/resource/sprayer-calibration-fundamentals/).