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7. Maintenance of Saw Chain and Guide Bar

EN 17

1. Saw Chain

It is very important for

smooth and safe operation to always keep
the cutters sharp.

The cutters need to be sharpened when:

• Sawdust becomes powder-like.
• You need extra force to saw in.
• The cut path does not go straight.
• Vibration increases.
• Fuel consumption increases.

Cutter setting standards

Be sure to wear safety

gloves.

Before filing:

• Make sure the saw chain is held securely.
• Make sure the engine is stopped.
• Use a round file of proper size for the chain

(5/32 in. - 4.0 mm).

Place the file on the cutter and push straight for-
ward.
Keep the file position as illustrated.

After each cutter has been filed, check the depth
gauge and file it to the proper level as illustrated.

Be sure to round off the

front edge to reduce the chance of kickback
or tie-strap breakage.

WARNING!

WARNING!

WARNING!

Make sure every cutter has the same length and
edge angles as illustrated.

2. Guide Bar

• Reverse the bar occasionally to prevent partial

wear.

• The bar rail should always be square. 

Check for wear of the bar rail. Apply a ruler to the
bar and the outside of a cutter. If a gap is
observed between them, the rail is normal.
Otherwise, the bar rail is worn. Such a bar needs
to be corrected or replaced.

(1) Appropriate

gauge checker 

(2) Depth gauge

standard

(3) Make the shoul-

der round: 0.25”
- 0.64 mm

(A)

Cutter length

(30°) Filing angle
(85°) Side plate angle
(60°) Top plate cutting

angle

(1) Ruler
(2) Gap
(3) No gap
(4) Chain tilts

8. Maintenance of Saw Chain and Guide Bar

Содержание PR270

Страница 1: ...hanged In the event of doubt please contact your dealer Enjoy your work This chainsaw has been espe cially designed for tree mainte nance and should therefore only be used by trained opera tors when working on trees WARNING EXPLANATION OF SYMBOLS AND SAFETY WARNINGS 1 Read understand and follow all warnings 2 Warning Danger of kickback 3 Use the chain saw with two hands 4 Read operator s instructi...

Страница 2: ...work that can cause sparks in the areas where fuel is mixed poured or stored 7 Do not smoke while handling fuel or while operating the chain saw 8 Do not allow other persons to be near the chain saw when start ing or cutting Keep bystanders and animals out of the work area Children pets and bystanders should be a minimum of 10 m away when you start or operate the chain saw 9 Never start cutting un...

Страница 3: ...ack may occur when the nose or tip of the guide bar touches an object or when the wood closes in and pinches the saw chain in the cut Tip contact in some cases may cause a lightning fast reverse reaction kick ing the guide bar up and back towards the operator Pinching the saw chain along the top of the guide bar may push the guide bar ra pidly back towards the operator Either of these reactions ma...

Страница 4: ...via the strop and direct attachment i e at the attachment point on the saw of saw to the operators harness c ensure the saw is securely attached when it is being sent up to the operator d ensure the saw it secured to the harness before it is disconnected from the means of ascent The saw should only be attached to the recom mended attachment points on the harness These may be at mid point front or ...

Страница 5: ...ust the saw away from the body while holding the pull starter cord in the left hand The chain brake should always be engaged be fore lowering a running saw onto its strop Operators should always check the saw has suf ficient fuel before undertaking critical cuts One hand use of the chainsaw Operators should not use tree service chainsaws onehanded in place of unstable work positioning or in prefer...

Страница 6: ... can set the starting mode as follows First stage position start ing mode when the engine is warm Second stage position starting mode when the engine is cold Position Upper right of the aircleaner cover WARNING The screw under the H stamp is The High speed adjustment screw The screw under the L stamp is The Slow speed adjustment screw The screw at the left of the T stamp is the Idle adjustment scr...

Страница 7: ...n fit the saw chain around the bar and sprocket Pay attention to the correct direction of the saw chain 5 Fit the chain tensioner nut into the lower hole of the guide bar then install the chain cover and fasten the mounting nut to finger tight ness When installing the chain cover be sure to fit the hook completely at the rear end of the cover 6 While holding up the tip of the bar adjust the chain ...

Страница 8: ...bustion These engines are certified to operate on unleaded gasoline Make sure to use gasoline with a minimum octane number of 89RON USA Canada 87AL If you use a gasoline of a lower octane value than prescribed there is a danger that the engine temperature may rise and an engine problem such as piston seizing may conse quently occur Unleaded gasoline is recommended to reduce the contamination of th...

Страница 9: ...ch have been left unused for a period of one month or more may clog the carburetor and result in the engine failing to operate properly 5 In the case of storing the product for a long period of time clean the fuel tank after ren dering it empty Next activate the engine and empty the carburetor of the composite fuel WARNING 6 In the case of scrapping the used mixed oil container scrap it only at an...

Страница 10: ...t return to the operating position even if you press down on it with your finger When you wish to return the choke knob to the operating position pull out the throttle lever instead Before you start the engi ne make sure the saw chain is not contacting anything Starting the engine on the ground Do not start the engine while the chain saw hangs in one hand The saw chain may touch your body This in ...

Страница 11: ...1 H and L needles are restricted within the number of turn as shown below H needle 1 4 L needle 1 4 2 Start the engine and allow it to warm up in low speed for a few minutes 3 Turn the idle adjusting screw T counter clockwise so that the saw chain does not turn If the idling speed is too slow turn the screw clockwise 4 Make a test cut and adjust the H needle for best cutting power not for maximum ...

Страница 12: ...h the brake lever left hand guard down toward the front using the back of your left hand 3 When the brake operates and the chain is stopped release the throttle lever 4 Release the brake STOPPING THE ENGINE 1 Release the throttle lever to allow the engine to idle for a few minutes 2 Set the switch to the O STOP position 1 Switch 1 Release 2 Activate the brake ...

Страница 13: ...s equipped with a chain brake that will stop the chain in the event of kickback if operating properly You must check the chain brake operation before each usage by run ning the saw at full the throttle for 1 2 seconds and pushing the front hand guard forward The chain should stop immediately with the engine at full speed If the chain is slow to stop or does not stop replace the brake band and clut...

Страница 14: ...ction to prevent the guide bar from being caught in the cut A log lying on the ground Saw down halfway then roll the log over and cut from the opposite side A log hanging off the ground In area A saw up from the bottom one third and finish by sawing down from the top In area B saw down from the top one third and finish by sawing up from the bottom WARNING WARNING Cutting the limbs of Fallen Tree F...

Страница 15: ... the oiling port Sprocket nose Grease the nose sprocket from the feeding port on the tip of the bar WARNING 4 Others Check for fuel leakage and loose fastenings and damage to major parts especially handle joints and guide bar mounting If any defects are found make sure to have them repaired before operating the saw again PERIODICAL SERVICE POINTS 1 Cylinder fins 1 Remove the starter case 2 Remove ...

Страница 16: ... inlet port of the cooling air and cylinder fins will cause overheating of the engine Periodically check and clean the cylinder fins after removing the air cleaner and the cylinder cover When installing the cylinder cover make sure that switch wires and grom mets are positioned correctly in place 7 Muffler If you do not attach the muffler correctly after engine starts the muf fler will be loosen a...

Страница 17: ... has been filed check the depth gauge and file it to the proper level as illustrated Be sure to round off the front edge to reduce the chance of kickback or tie strap breakage WARNING WARNING WARNING Make sure every cutter has the same length and edge angles as illustrated 2 Guide Bar Reverse the bar occasionally to prevent partial wear The bar rail should always be square Check for wear of the ba...

Страница 18: ...the unit seems to need further serv ice please consult with an authorized service shop in your area The table contains a list of all possible combina tions between bar and chain indicating those which may be used on each machine marked with the symbol In consideration that the selection application and usage of bar and WARNING chain are actions made solely by the user the latter assumes responsibi...

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