13, Troubleshooting - OREC GRH537Pro Owner's Manual

13, Troubleshooting

If the engine is defective, perform diagnosis by referring to the following table and then taking the
appropriate action.
Effect
Safety switch is not in the [start up] positio
Choke lever has not been pulled out.
Fuel is not flowing properly.
You have trouble
starting the
machine, or the
machine will not
There is air or water mixed in the fuel
start at all.
delivery system.
In cold weather, oil becomes thick, and
the engine rotation is sluggish.
Ignition coil or unit is defective.
Defective spark plug.
Fuel shortage.
Clogged air filter.
Poor quality fuel.
Output shortage
Choke has not been fully opened.
Cooling system is clogged.
The machine stops Fuel shortage.
suddenly.
Fuel valve is closed.
Exhaust gas is Poor quality fuel.
abnormally black
Overfilled with engine oil.
Air filter element is clogged.
Muffler emits black
smoke and power
Choke has not been fully opened.
output falls.
Muffler emits gray Overfilled with engine oil.
smoke.
Cylinder or piston ring is worn out
Engine revolution is
Choke has not been fully opened.
not stable (does not
increase).
Poor quality fuel.
Defective ignition coil.
Momentary stall.
Fuel filter is clogged.
Exhaust has an
Poor quality fuel.
irritating smell.
＊Please consult with your local retailer. Charges may apply.
If you do not understand any of these points, please consult with the retailer where you purchased
this machine.
Cause
34
Treatment
Put the safety switch to the [start up]
position.
When cooling the engine, put the choke
bar in the position.
Inspect fuel tank, remove impure
deposits or water.
Remove the fuel valve strainer and clean
out any sediment deposited inside the
cap together with any other attached dirt.
Remove foreign objects, inspect
fastening bands, replace damaged parts
with new ones.
Use the correct oil depending on the
outside temperature.
Replace the ignition coil or unit.
*
Inspect the gap between spark plug
electrodes and adjust.
Replace with new spark plug.
Refuel the machine.
Clean the element.
Replace with good quality fuel.
Return the choke bar completely. Put it
in the position.
Clean around the recoil starter.
Refuel the machine.
Open the fuel valve.
Replace with good quality fuel.
Adjust to correct fuel level
Clean the element.
Return the choke bar completely. Put it
in the position.
Adjust to correct fuel level
Replace the ring.
*
Return the choke bar completely. Put it
in the position
Replace with good quality fuel.
Replace the ignition coil.
*
Clean the fuel filter.
Replace with good quality fuel.