Subaru Robin EX40 Engine

• Engine does not start
  Cause: Fuel tank empty
  Fix: Fill fuel tank
• Low or fluctuating discharge pressure
  Cause: Inadequate water supply
  Fix: Use larger I.D. size of hose and provide specified inlet water pressure and volume
• Engine starts hard or loses power
  Cause: Dirt or water in fuel tank
  Fix: Drain and clean fuel tank
• Detergent will not siphon into Low Pressure Detergent mode
  Cause: Strainer not completely submerged in solution
  Fix: Check, submerge if necessary
• Engine runs erratically
  Cause: Carburetor out of adjustment
  Fix: See your John Deere dealer
• No discharge at nozzle when trigger mechanism is squeezed
  Cause: Low pressure or no water supply
  Fix: Ensure hose is 5/8 in. inside diameter and incoming water supply is turned on
• Water leaks from brass valve on pump
  Cause: Thermal Relief Valve opening to protect pump
  Fix: Do not run washer with gun trigger closed for more than 3 minutes; Trigger gun to close valve
• Water flows from nozzle when trigger is released
  Cause: Gun malfunction
  Fix: DO NOT USE!! See your John Deere dealer
• Water flows back into detergent container
  Cause: Detergent valve jammed, missing or corroded
  Fix: See your John Deere dealer
• Pump oil is white or milky color
  Cause: Water in oil
  Fix: Change oil. Avoid directing water spray at pump
• Oil leaking from pump
  Cause: Pump failed
  Fix: DO NOT USE!! See your John Deere dealer
• Engine idles poorly
  Cause: Air filter element dirty
  Fix: Clean or

Compiled from service & troubleshooting documentation across every generator set that uses the Subaru Robin EX40.