The Importance of Knapsack Maintenance and Replacing Parts

Regular servicing helps your knapsack sprayer work effectively, reduces the risk of breakdowns and extends its lifespan. Worn or damaged parts can affect spraying performance, so check your sprayer before the spraying season and replace parts as needed.

With reputable brands of sprayers and the correct maintenance and care, knapsacks can live a very long life, with some people seeing over 20 years of use!

Clean your knapsack sprayer after every use, following the product label and sprayer manufacturer's cleaning instructions. Typically, this involves triple rinsing the tank and flushing clean water through the hose, lance and nozzle. Use a suitable tank and sprayer cleaner where specified, and dispose of rinsate according to the product label.

Thorough cleaning helps prevent residues from contaminating your next application. For example, a total weedkiller left in a sprayer could damage your lawn if you later use it to apply liquid fertiliser.

Rubber seals, O-rings, pump components, spray lances, and trigger parts may need replacing as your knapsack sprayer ages. Check regularly for wear, cracks or leaks, and choose replacement parts suitable for your model.

• Seals and pump components: Rubber can perish or crack. Piston sprayers may need a new cup seal, while diaphragm sprayers may need a replacement diaphragm. Follow the manufacturer's maintenance and lubrication instructions.
• Spray lances: Accidental damage or overtightening connections can cause cracks, leading to leaks and potentially exposing nearby plants or surfaces to spray.
• Triggers and filters: Clean in-line filters within the hand grip regularly. Sticking or leaking triggers may need cleaning or replacement components, including seals and washers.

Brands such as Mesto, Cooper Pegler and Matabi offer spare parts that can help extend your sprayer's lifespan. For guidance on dismantling your knapsack sprayer, watch our video below.