ETQ 170F, Owner'S Manual

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Possible Cause Remedy
Fuel system clogged. Clogged fuel line or clogged
fuel filter. Clean fuel filter and fuel pipe. Check the fuel
switch, it should be opened fully.
Fuel pump is bad. Service or change the damaged parts of the fuel
pump.
Nozzle not operating correctly or incorrect
injection pressure. Adjust the injection pressure.
Carbon deposits in the spray hole. Clean out the spray hole.
Adhered needle valve. Clean or change needle valve.
Fitting between the needle valve and needle valve
body is too loose. Change the needle valve or needle valve body.
Air filter is dirty. Disassemble the air filter assembly and clean the
core and air filter.
Engine may be to slow. Check the speed of the tachometer. Adjust the
high speed limiting screw.
5-3 Engine stops automatically
Possible cause Remedy
No fuel in system. Add fuel to the fuel tank.
Fuel line is clogged. Clean out fuel line.
There is air in fuel system. Clean out the system and put new fuel in.
Needle valve of nozzle adhered. Clean or grind the nozzle if necessary replace the
nozzle.
Air filter is clogged. Clean the air filter.
The load suddenly increases. Decrease the load.
5-4 Engine exhaust very black
Possible cause Remedy
Overloaded engine Decrease the load. If driven machine is not
properly fitted with proper engine, change the
engine.
Bad fuel injection. Check the fuel injection pressure and spraying
conditions. Correct or replace the nozzle.
Not enough intake air or problems with leaking air. Clean the air filter and check to see what the cause
of the leak is and fix as necessary.
5-5 Engine exhaust very blue
Possible cause Remedy
Engine oil in the cylinder. Check the oil level and drain out unnecessary engine
oil.
Piston ring worn or piston ring gaps are all
aligned to permit oil to travel up into
combustion chamber. Check or change the piston rings and make sure the
gaps are not all aligned.
Worn piston or worn cylinder. Replace as necessary.
Valve and or valve guide worn. Change the valve or valve guide as necessary.
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