Solo 475 Deluxe Diaphragm Repair Kit 0610406-K – Pump Rebuild Kit for Solo 475, 473-D and 485

Solo Diaphragm Repair Kit for the 475-Deluxe, 475, 473-D and 485

This genuine Solo diaphragm repair kit (part 0610406-K) rebuilds the pump on the Solo 475-Deluxe, 475, 473-D and 485 backpack sprayers. It replaces every rubber and wear part in the diaphragm pump, including the diaphragm itself, both valve plates, four O-rings, the spring and the seal plug, so a sprayer that struggles to build or hold pressure can be brought back to proper working order.

One Kit for the 475, 475-Deluxe, 473-D and 485

These four Solo backpack sprayers share the same diaphragm pump design, so one kit services all of them. That is handy for councils, landscapers, farms and households running more than one Solo model, as a single spare kit covers the lot. If you are unsure which model you have, check the label on the tank or the pump housing for the model number.

Part-by-Part Breakdown

The diaphragm (4074246) is the flexible membrane that flexes with each stroke of the handle to move liquid into the pressure chamber. The two valve plates (4061257) act as one-way valves, letting liquid in on the suction stroke and out on the pressure stroke. The four O-rings (0062138, 0062285, 0062291 and 0062258) seal the joins in the pump body. The spring (0070260) and seal plug (4074350) belong to the pressure valve. Knowing these numbers helps if you ever need to order a single part or check a parts diagram.

Why Diaphragm Pumps Suit Garden Chemicals

In a diaphragm pump, the liquid is kept separate from most of the moving parts by the diaphragm, so there is less metal and seal rubbing against the spray mix. That makes these pumps a practical choice for regular herbicide, insecticide and fungicide work. Even so, the diaphragm and valves are still exposed to chemicals and do wear over time, which is why a rebuild kit is part of normal servicing.

Key Features and Benefits

• Genuine Solo diaphragm pump repair kit, part 0610406-K
• Fits Solo 475, 475-Deluxe, 473-D and 485 backpack sprayers
• New diaphragm, two valve plates, four O-rings, spring and seal plug
• Restores pump pressure and stops pump leaks
• One kit services several Solo models
• Individual Solo part numbers for easy reference

Product Details

• Brand: Solo
• Part number: 0610406-K
• Compatible models: Solo 475, 475-Deluxe, 473-D, 485
• Diaphragm: 4074246
• Valve plates: 4061257 (x2)
• O-rings: 0062138, 0062285, 0062291, 0062258
• Spring: 0070260
• Seal plug: 4074350

Step-by-Step Diaphragm Replacement

Empty the tank, rinse it and pump clean water through the sprayer to flush out chemical residue, then wear gloves and eye protection while you work. Remove the pump assembly from the sprayer following your model's manual. Open the pump housing and lift out the old diaphragm, noting which way it faces. Remove the two valve plates and old O-rings, then wipe all sealing surfaces clean. Fit the new valve plates in the same orientation as the old ones, seat each new O-ring fully in its groove, and place the new diaphragm the same way round as the original. Replace the spring and seal plug in the pressure valve. Reassemble, tightening screws evenly in a cross pattern so the housing pulls down square, then test with clean water before using chemicals again.

Frequently Asked Questions

Which diaphragm repair kit fits the Solo 475 Deluxe?
The Solo Diaphragm Pump Repair Kit 0610406-K fits the 475-Deluxe, as well as the standard 475, the 473-D and the 485.

What pump parts fit the Solo 473D and Solo 485 sprayers?
Both use the same diaphragm pump parts found in kit 0610406-K: diaphragm 4074246, valve plates 4061257, O-rings, spring 0070260 and seal plug 4074350.

How do you replace the diaphragm in a Solo backpack sprayer?
Flush and empty the sprayer, remove the pump, open the housing and swap the old diaphragm for the new one facing the same way. Replace the valve plates and O-rings at the same time, then reassemble and test with water.

How often should the pump be serviced?
Rebuild it whenever pressure becomes hard to build or hold, or if the pump starts leaking. Sprayers used often with chemicals may need a kit every season or two.

Should I replace everything in the kit at once?
Yes. The parts wear together, so replacing only the diaphragm can leave old valve plates or O-rings that still cause pressure loss.

Where can I buy Solo 485 repair parts in Sydney?
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.