Hitachi CS 33EDP 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 saw chain 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
Are revolutions fluctuated
during acceleration?
Yes
No
Does the engine stop when
the speed rapidly decelerates
from high speed?
Yes
No
Is fuel consumption
excessive?
Yes
No
Dirty or faulty spark plug
Defective air gap
Worn piston ring
Worn piston
Worn cylinder
Expired oil seal service life
Revolutions low for idling
Poorly adjusted carburetor ass'y
Defective sealing of the packing
Revolutions low for idling
Poorly adjusted carburetor ass'y
Defective sealing of the packing
Revolutions too high for idling
Worn or faulty clutch
Poorly adjusted carburetor ass'y
Clogged fuel filter
Inadequate warm-up, especially in cold
weather
Poorly adjusted carburetor ass'y
Defective sealing of the packing
Clogged cylinder vent passage, exhaust port
or carbon-clogged muffler
Clogged air cleaner
Chain brake set on
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
Defective sealing of the packing
Clogged air cleaner
Poorly adjusted carburetor ass'y
-5-
Clean/replace.
Adjust.
Replace.
Replace.
Replace.
Replace.
Adjust.
Adjust.
Replace.
Adjust.
Adjust.
Replace.
Adjust.
Inspect/replace.
Adjust.
Clean/replace.
Warm up.
Adjust.
Replace.
Clean.
Clean.
Release.
Adjust.
Replace.
Clean.
Clean.
Inspect.
Replace.
Adjust.
Adjust.
Adjust.
Replace.
Clean.
Adjust.