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technique to get the “feel” of using the saw before you 
begin a major sawing operation.
1.  Take the proper stance in front of the wood with the 

saw idling.

2. Accelerate the engine to full throttle just before 

entering the cut by squeezing the throttle trigger.

3.  Begin cutting with the saw against the log.
4.  Keep the engine at full throttle the entire time you are 

cutting.

5.  Allow the chain to cut for you; exert only light downward 

pressure. Forcing the cut could result in damage to the 
bar, chain, or engine.

6.  Release the throttle trigger as soon as the cut is 

completed allowing the engine to idle. Running the 
saw at full throttle without a cutting load can result in 
unnecessary wear to the chain, bar, and engine.

7.  Do not put pressure on the saw at the end of the cut as 

this may cause the saw to drop in an unsafe manner.

FELLING TREES IN HAZARDOUS CONDITIONS

WARNING:

Do not fell trees during periods of high wind or 
heavy rain. Wait until the hazardous weather 

has ended. When felling a tree, it is important 
that you heed the following warnings to prevent 
possible serious injury.

„

  Do not cut down trees having extreme lean or large 

trees with rotten limbs, loose bark, or hollow trunks. 
Have these trees pushed or dragged down with 
heavy equipment, then cut them up.

„

  Do not cut trees near electrical wires or buildings.

„

  Check the tree for damaged or dead branches that 

could fall and hit you during felling.

„

  Periodically glance at the top of the tree during the 

back cut to assure the tree is going to fall in the 
desired direction.

„

  If the tree starts to fall in the wrong direction, or if the 

saw gets caught or hung up during the fall, leave the 
saw and save yourself!

PROPER PROCEDURE FOR TREE FELLING
See Figures 16, 23 - 25.

1.  Pick your escape route (or routes in case the intended 

route is blocked). Clear the immediate area around the 
tree and make sure there are no obstructions in your 
planned path of retreat.

2.  Consider the force and direction of the wind, the lean 

and balance of the tree, and the location of large limbs. 

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will fall. Do not try to fell a tree along a line different 
from its natural line of fall.

3.  Cut a notch about 1/3 the diameter of the trunk in the 

side of the tree. Make the notch cuts so they intersect 

at a right angle to the line of fall. This notch should be 
cleaned out to leave a straight line. To keep the weight 
of the wood off the saw, always make the lower cut of 
the notch before the upper cut.

4.  Make the back cut level and horizontal, and at a 

minimum of 50 mm above the horizontal cut of the 
notch.

Note:

 Never cut through to the notch. Always leave 

a band of wood between the notch and back cut 
(approximately 50 mm or 1/10 the diameter of the 
tree). This is called a “hinge” or “hinge wood.” It 
controls the fall of the tree and prevents slipping or 
twisting or shooting back of the tree off the stump.

5.  On large diameter trees, stop the back cut before it is 

deep enough for the tree to either fall or settle back on 
the stump. Then insert soft wooden or plastic wedges 
into the cut so they do not touch the chain. Drive 
wedges in, little by little, to help jack the tree over.

6.  As the tree starts to fall, stop the chainsaw and put 

it down immediately. Retreat along the cleared path, 
but watch the action in case something falls your way.

WARNING

Never cut through to the notch when making a 
back cut. The hinge controls the fall of the tree, 

this is the section of wood between the notch and 
back cut.

REMOVING BUTTRESS ROOTS
See Figure 26.

A buttress root is a large root extending from the trunk of 
the tree above the ground. Remove large buttress roots 
prior to felling. Make the horizontal cut into the buttress 
first, followed by the vertical cut. Remove the resulting 
loose section from the work area. Follow the correct tree 
felling procedure as stated in 

Proper procedure for tree 

felling 

after you have removed the large buttress roots.

BUCKING
See Figure 27.

Bucking is the term used for cutting a fallen tree to the 
desired log length.

„

  Cut only one log at a time.

„

  Support small logs on a saw horse or another log 

while bucking.

„

  Keep a clear cutting area. Make sure that no objects 

can contact the guide bar nose and chain during 
cutting, this can cause 

Kickback

. Refer to Kickback 

in the Specific Safety Rules section of this manual for 
more information.

„

  During bucking operations, stand on the uphill side so 

that the cut-off section of the log cannot roll over you.

„

  Sometimes it is impossible to avoid pinching (with 

just standard cutting techniques) or difficult to predict 

Summary of Contents for RCS4240NB

Page 1: ...CHAINSAW OPERATOR S MANUAL Important It is essential that you read the instructions in this manual before assembling maintaining and operating the product RCS4240NB...

Page 2: ...igger release 3 Throttle trigger 4 Starter housing 5 Chain lubricant cap 6 Rear handle 7 Engine cover 8 Front handle 9 Front hand guard chain brake 10 Clutch cover 11 Chain tensioning screw 12 Bar mou...

Page 3: ...0 Clutch cover Figure 38 53 Chain drive links 54 Cutters 55 Chain rotation Figure 39 56 Bar groove Figure 40 10 Clutch cover 57 Adjusting pin 58 Chain tensioning pin hole 59 Sprocket Figure 41 11 Chai...

Page 4: ...your left hand on the front handle with your thumbs and fingers encircling the chainsaw handles A firm grip together with a stiff left arm will help you maintain control of the saw if kickback occurs...

Page 5: ...jury Do not cut vines and or small underbrush at a diameter of less than 75 mm 3 in Muffler surfaces are very hot during and immediately after operation of the chainsaw keep all body parts away from t...

Page 6: ...rnings shouts or alarms The operator must pay extra attention to what is going on in the work area KICKBACK Kickback is a dangerous reaction that can lead to serious injury Do not rely only on the saf...

Page 7: ...erate the saw using only one hand Wear non slip heavy duty protective gloves when handling the chainsaw Always wear safety boots with non slip soles Add bar and chain oil every time you add fuel to th...

Page 8: ...XOOV Place the choke lever in the RUN position 3XOO WKH VWDUWHU KDQGOH XQWLO WKH HQJLQH VWDUWV QR PRUH WKDQ YH SXOOV Press release of the trigger Squeeze and release the throttle trigger Set the chain...

Page 9: ...ation always wear safety goggles safety glasses with side shields or a full face shield when needed We recommend Wide Vision Safety Mask for use over eyeglasses or standard safety glasses with side sh...

Page 10: ...ickback reaction by preventing the cutters from digging in too deeply at the kickback zone As saw chains are sharpened they lose some the low kickback qualities and extra caution is required For your...

Page 11: ...auge 1 27 mm 0 05 inch Chain type ORZ SUR OH IXOO FRPSOHPHQW Drive sprocket 6 teeth x 3 8 Engine displacement 42 cm3 Maximum engine power ISO 7293 1 7 kW Maximum engine speed with cutting attachment r...

Page 12: ...r M1501656 1041 310443001 Black 160SDEA041 311024001 Black Chain Trilink part number Part number Oregon part number Part number CL15056PB 682006002 91P056PTT 901213012 Other Features Catalyst No Metal...

Page 13: ...bar mounting nuts are loosened to QJHU WLJKW LJXUH 3 Turn the chain tensioning screw clockwise counter clockwise to increase reduce chain tension Check the chain tension frequently Figure 43 4 Hold th...

Page 14: ...rom refuelling site before starting the engine DO NOT SMOKE Failure to heed this warning could result in serious personal injury FUELING AND REFUELING HANDLING THE FUEL SAFELY WARNING Check for fuel l...

Page 15: ...n position 4 Pull the starter grip until the engine runs but no more that 5 times If engine does not start after 5 pulls use the cold engine starting procedure Note Do not use Ethanol fuels or fuels c...

Page 16: ...otection Hold the saw firmly with both hands Always keep your left hand on the front handle and your right hand on the rear handle so that your body is to the left of the chain line WARNING Never use...

Page 17: ...a notch about 1 3 the diameter of the trunk in the side of the tree Make the notch cuts so they intersect at a right angle to the line of fall This notch should be cleaned out to leave a straight lin...

Page 18: ...runing trees it is important not to make the flush cut next to the main limb or trunk until you have cut off the limb further out to reduce the weight This prevents stripping the bark from the main me...

Page 19: ...slack from the chain by rotating the chain tensioning screw clockwise until the chain seats snugly against the bar with the drive links in the bar groove 12 Lift the tip of the guide bar up to check f...

Page 20: ...er housing Reinstall screws and secure 12 Replace the chain lubricant and fuel caps 13 Replace the engine cover Reinstall screws and secure 14 Replace the chain brake on the post Note Check to ensure...

Page 21: ...ated place that is inaccessible to children Keep away from corrosive agents such as garden chemicals and de icing salts Observe local regulations for the safe storage and handling of petrol When stori...

Page 22: ...act an authorised service centre for adjustment carburettor adjustment Engine starts but will not run Carburettor requires H Contact an authorised service centre for properly at high speed High jet ad...

Page 23: ...or bar may be damaged If no lubricant is present contact an authorised service centre Engine starts and runs but Chain brake is engaged Release chain brake Refer to Operating the chain is not rotatin...

Page 24: ...960994057 01 Techtronic Industries Australia Pty Ltd 31 Gilby Road Mt Waverley VIC 3149 Australia Techtronic Industries New Zealand Ltd 2 Landing Drive Mangere Auckland New Zealand 2022...

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