Husqvarna Gas pressure washer Parts — Browse All Models

Replacing the chemical injection valve in your Husqvarna gas pressure washer

• Wear work gloves to protect your hands.
• Disconnect the sparkplug wire from the spark plug.
• If detergent is in the detergent reservoir, clamp the chemical injection hose near the chemical injection valve. Use an open-end wrench to turn the chemical injection valve counter-clockwise and remove it.
• Install the O-ring on the new chemical injection valve. Lubricate the O-ring with silicone lubricant. Thread the new chemical injection valve into the pump and tighten. Reconnect the chemical injection hose. Release the clamp from the chemical injection hose, if used.
• Reconnect the spark plug wire.

What to do when water sprays out of the pressure relief valve on your Husqvarna gas pressure washer

If the pressure washer runs for more than 5 minutes when the spray wand isn't in use, the water in the pump often overheats, causing the thermal relief valve to open and discharge hot water onto the ground. When the thermal relief valve opens, cool water enters the pump and cools the system. Once the pump has cooled, the thermal relief valve closes and the pressure washer operates normally. If the pressure relief valve purges constantly and doesn't close properly, replace it.