Chainsaw User Manual

55MS 290, MS 310, MS 390
English / USA
Definitions
1. Carburetor Box Cover Twist
Lock.
Lock for carburetor box cover.
2. Carburetor Adjusting Screws.
For fine tuning the carburetor.
3. Spark Plug Boot.
Connects the spark plug with the
ignition wire.
4. Chain Sprocket Cover.
Covers the clutch and the sprocket.
5. Chain Sprocket.
The toothed wheel that drives the
saw chain.
6. Chain Brake.
A device to stop the rotation of the
chain if activated in a kickback
situation by the operator's hand or
by inertia.
7. Chain Tensioner.
Permits precise adjustment of chain
tension.
8. Chain Catcher.
Helps to reduce the risk of operator
contact by a chain when it breaks
or comes off the bar.
9. Bumper Spike.
Toothed stop for holding saw steady
against wood.
10. Guide Bar.
Supports and guides the saw chain.
11. Oilomatic Saw Chain.
A loop consisting of cutters, tie
straps and drive links.
12. Oil Filler Cap.
For closing the oil tank.
13. Muffler.
Reduces engine exhaust noise and
directs the exhaust gases.
14. Front Hand Guard.
Provides protection against
projecting branches and helps
prevent left hand from touching the
chain if it slips off the handlebar.
15. Front Handle (handlebar).
Handle bar for the left hand at front
of saw.
16. Decompression valve.
Releases compression pressure to
make starting easier.
17. Starter Grip.
The grip of the starter, for starting
the engine.
18. Master Control Lever.
Lever for choke control, starting
throttle, run and stop switch
positions.
19. Fuel Filler Cap.
For closing the fuel tank.
20. Throttle Trigger.
Controls the speed of the engine.
21. Throttle Trigger Interlock.
Must be depressed before the
throttle trigger can be activated.
22. Rear Handle.
The support handle for the right
hand, located at or toward the rear
of the saw.
23. Rear Hand Guard.
Gives added protection to
operator's right hand.
Guide Bar Nose.
The exposed end of the guide bar.
(not illustrated, see chapter
“Tensioning the Saw Chain”.
Clutch.
Couples engine to chain sprocket
when engine is accelerated beyond
idle speed.
(not illustrated).
Anti-Vibration System.
The anti-vibration system includes a
number of buffers designed to
reduce the transmission of
vibrations created by the engine
and cutting attachment to the
operator's hands.
(not illustrated).