Hitachi CM 75EAP Service Manual page 6

Start the tool and set to
idling mode.
Does the engine stop?
Yes
No
Tilt the tool during idling.
Does the engine stop?
Yes
No
Does the cut-off wheel
rotate during idling?
Yes
No
Does the engine stop by
pulling the throttle lever?
Yes
No
Does the speed increase
by pulling the throttle lever?
No
Yes
Do revolutions fluctuate
during acceleration?
Yes
No
Does the engine stop when
rapidly decelerating from
high speed?
Yes
No
Is fuel consumption
excessive?
Yes
No
Dirty or faulty spark plug
Improper gap between
circumference and ignition coil
Worn piston ring
Expired oil seal service life
Decompression valve trouble
Revolutions low for idling
Poorly adjusted carburetor ass'y
Revolutions low for idling
Poorly adjusted carburetor ass'y
Defective sealing of the packing
Revolutions too high for idling
Poorly adjusted carburetor ass'y
Worn or faulty clutch
Clogged fuel filter
Inadequate warm-up, especially in cold
weather
Poorly adjusted carburetor ass'y
Clogged cylinder vent passage, exhaust port
or carbon-clogged muffler
Clogged air cleaner
Poorly adjusted carburetor ass'y
Faulty carburetor ass'y pump diaphragm
Dirt-clogged carburetor ass'y
Dirt-clogged high-speed fuel line of the
carburetor ass'y
Air intake from the packing section
Faulty carburetor ass'y pump diaphragm
Poorly adjusted carburetor ass'y
Revolutions low for idling
Poorly adjusted carburetor ass'y
Clogged air cleaner
Poorly adjusted carburetor ass'y
-5-
Clean/replace.
magneto rotor
Adjust.
Replace.
Clean/replace.
Adjust.
Adjust.
Replace.
Adjust.
Inspect/replace.
Clean/replace.
Warm up.
Adjust.
Clean.
Adjust.
Replace.
Clean.
Clean.
Inspect.
Replace.
Adjust.
Adjust.
Clean.
Adjust.