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Worn water seals, abrasives in water, or natural 3. Check filter. Replace water seals. See service center wear 4. Clean inlet and discharge valve assemblies. Check 4. Fouled or dirty inlet or discharge valves filter 5. Restricted inlet 5. Check garden hose, may be collapsed or kinked. Check inlet water flow 6. Worn inlet or discharge valves 6. Replace worn valves 7. Leaking high pressure hose 7. Replace high pressure hose 8. Pump drawing in air 8. Ensure hoses and fittings are tight 9. Unloader