Simpson ALH3425-S - User Manual

Questions and Answers

Q
qmorrisonAug 5, 2025
Why won't my Simpson ALH3425-S engine start?
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  Gerald SmithAug 5, 2025
  The engine of your Simpson Pressure Washer might not start due to several reasons. It could be due to no fuel, so add fresh fuel. If pressure builds up after a couple of pulls, squeeze the gun trigger to relieve the pressure. Check that the choke lever is in the correct position. Also, ensure the spark plug wire is attached and the engine switch is in the ON position. If the engine is hot, make sure the choke lever is in the "No Choke" position.
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Brianna CortezAug 11, 2025
What to do if Simpson Pressure Washer has no or low pressure?
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  Juan McdonaldAug 11, 2025
  If your Simpson Pressure Washer has no or low pressure, ensure the spray wand is in high pressure. Also, check that the water supply is at least 5 gpm @ 20 PSI. Repair any leaks at the high-pressure hose fitting, applying sealant tape if needed. Additionally, ensure the nozzle isn't obstructed, and the water filter screen isn't clogged; clean the filter if necessary.
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Raymond SantosAug 17, 2025
Why Simpson ALH3425-S won't draw chemicals?
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  aaron97Aug 17, 2025
  Your Simpson Pressure Washer may not draw chemicals for several reasons. Ensure the spray wand is set to low pressure. Check and clean the chemical filter if it's clogged. Make sure the detergent siphon hose is fully submerged in the cleaning solution. If the chemical is too thick, dilute it to the consistency of water. Avoid using a high-pressure hose that is too long; instead, lengthen the water supply hose.
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Patricia SanchezAug 23, 2025
How to fix Simpson ALH3425-S Pressure Washer leaking water at gun/spray wand connection?
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  twestAug 23, 2025
  If your Simpson Pressure Washer is leaking water at the gun/spray wand connection, check for worn or torn o-rings and replace them if necessary. Also, ensure the hose connection is not loose and tighten it if needed.
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Jennifer GeorgeAug 28, 2025
Why is my Simpson ALH3425-S Pressure Washer leaking oil at the pump?
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  howelljuliaAug 29, 2025
  If your Simpson Pressure Washer is leaking oil at the pump, check for the following issues: 1. Loose drain plug - tighten if necessary. 2. Worn drain plug o-ring - check and replace if needed. 3. Worn fill plug o-ring - check and replace if needed. 4. Pump overfilled - check for the correct amount. 5. Incorrect oil used - drain and fill with the correct type of oil. 6. Clogged vent plug - clean the vent plug to remove any blockage. 7. Air filter filled with oil - clean and/or replace the filter element.