Solo Diaphragm Pump Repair Kit 0610406-K – Fits Solo 475, 473-D and 485 Backpack Sprayers

Solo Diaphragm Pump Repair Kit for 475, 473-D and 485 Sprayers

The Solo Diaphragm Pump Repair Kit (part 0610406-K) is the genuine Solo rebuild kit for the diaphragm pump on Solo 475, 473-D and 485 backpack sprayers. It contains a replacement diaphragm, two valve plates, a set of O-rings, a spring and a seal plug, which are the wear parts that most often cause pressure loss and leaks. Replacing them brings a tired sprayer back to proper working pressure without buying a new one.

Signs Your Sprayer Pump Needs a Rebuild

Diaphragm pumps wear gradually, so the problems tend to creep up. Common signs include the sprayer taking more pumping to build pressure, pressure dropping off quickly while spraying, the spray pattern sputtering or fading, liquid weeping from around the pump housing, or the pump handle feeling different than it used to. Chemicals, grit and age all harden and wear rubber parts over time, and this kit replaces those parts in one go.

What Is Inside the Kit

The diaphragm is the flexible membrane that moves up and down to push liquid into the pressure chamber. The two valve plates open and close to let liquid in and out in the right direction. The O-rings seal the joins between pump parts, while the spring and seal plug look after the pressure valve. The kit pictured also includes screws. Together, these cover the parts that wear out in normal use.

Diaphragm Pump or Piston Pump?

Solo makes two pump types, and each needs its own kit. This kit is for the diaphragm pump models 475, 473-D and 485. Solo's piston pump sprayers, such as the 425, 435 and 473-P, use a different kit, the Piston Pump Repair Kit 0610407-K. Check the model number on your sprayer before ordering.

Key Features and Benefits

• Genuine Solo diaphragm pump repair kit, part 0610406-K
• Fits Solo 475, 473-D and 485 backpack sprayers
• Replaces the main wear parts in the pump
• Restores pumping pressure and helps stop leaks
• Includes diaphragm, valve plates, O-rings, spring and seal plug
• Extends the working life of your sprayer

Product Details

• Brand: Solo
• Part number: 0610406-K
• Compatible models: Solo 475, 473-D, 485
• Contents: Diaphragm, 2 x valve plates, O-rings, spring, seal plug, screws (as pictured)
• Pump type: Diaphragm pump

Rebuilding the Pump

Empty the sprayer completely, then flush it with clean water and run water through the pump and wand to clear out chemical residue. Wear gloves and eye protection, as there may still be traces of chemical inside. Follow the instruction sheet or your sprayer manual to open the pump housing, and take a photo of each step so you know how the parts go back together. Remove the old diaphragm, valve plates and O-rings, clean the housing, then fit the new parts in the same positions, making sure each O-ring sits fully in its groove. Reassemble, tighten screws evenly, then fill the tank with clean water and test for pressure and leaks before using chemicals again. After each spraying job, rinse the sprayer with clean water to help the new parts last.

Frequently Asked Questions

Which repair kit fits Solo 475 and 485 sprayers?
The Solo Diaphragm Pump Repair Kit 0610406-K fits the Solo 475, 485 and 473-D diaphragm pump backpack sprayers.

How do you repair a Solo diaphragm pump sprayer?
Empty and flush the sprayer, open the pump housing, replace the diaphragm, valve plates and O-rings with the new parts from the kit, then reassemble and test with clean water before spraying chemicals.

What parts are included in a Solo diaphragm pump repair kit?
It includes a diaphragm, two valve plates, O-rings, a spring and a seal plug. The kit pictured also includes screws.

Does this kit fit the Solo 425 or 435?
No. The 425 and 435 use a piston pump and need the Solo Piston Pump Repair Kit 0610407-K instead.

Why is my Solo sprayer losing pressure?
Worn diaphragms, valve plates and O-rings are the most common cause. Fitting this repair kit replaces those parts and usually restores pressure.

Where can I buy Solo sprayer pump parts in Bonnyrigg?
The Solo Diaphragm Pump Repair Kit is available from BPG Supplies, with local pickup from our store in Bonnyrigg in Sydney's south-west and delivery across Australia.