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4

Kickback Safety Precautions

KICKBACK 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, kicking 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
rapidly back toward the operator. Either of these
reactions may cause you to lose control of the saw,
which could result in serious personal injury.  

Do not rely exclusively upon the safety devices
built into your saw.  As a chain saw user, you
should take several steps to keep your cutting
jobs free from accident or injury.

• With a basic understanding of kickback, you can

reduce or eliminate the element of surprise. Sudden
surprise contributes to accidents. Be alert to the
potential for kickback at all times.

• Keep a good firm grip on the saw with both hands, the

right hand on the rear handle and the left hand on the
front handle, when the engine is running. Use a firm grip
with thumbs and fingers encircling the chain saw
handles. A firm grip will help you reduce kickback and
maintain control of the saw. Don’t let go.

• Make sure that the area in which you are cutting is free

from obstructions.  Do not let the nose of the guide
bar contact a log, branch, fence, or any other
obstruction that could be hit while you are operating
the saw.

• Always cut with the engine running at full speed.  Fully

squeeze the throttle trigger and maintain a steady
cutting speed.

• Use only the correct original equipment manufacturer

replacement bars, chains and other parts and
accessories. These are available from your authorized
service dealer. Use of any unauthorized parts or
accessories could lead to serious injury to the user, or
damage to the unit, and will void your warranty.

• Follow the manufacturer’s sharpening and

maintenance instructions for the saw chain.

• Use only the replacement guide bars and low kickback

chains specified for your saw to avoid injury.

Other Safety Precautions

• Do not operate a chain saw with one hand! Serious

injury to the operator, helpers, bystanders, or any
combination of these persons may result from one-
handed operation. A chain saw is intended for two-
handed use.

• Do not operate a chain saw if you are fatigued.

• Use safety footwear; snug-fitted clothing; protective

gloves; and eye, hearing, and head protection devices.

• Avoid accidental starting. Be in the starting position

whenever pulling the starter rope. The operator and
unit must be in a stable position while starting. See

Starting/Stopping Instructions

.

• Before you start the engine, make sure that the saw’s

chain is not contacting anything. Do not cut near
electrical cables or power lines.

• Keep all parts of your body away from the chain when

the engine is running.

• Do not start cutting until you have a clear work area,

secure footing, and a planned retreat path from the
falling tree.

• Do not operate a chain saw that is damaged,

improperly adjusted, or not completely and securely
assembled. Be sure that the saw’s chain stops moving
when the throttle control trigger is released.

• Shut off the engine before setting the chain saw down.

• Use extreme caution when cutting small-sized brush

and saplings because slender material may catch the
chain saw and whip towards you or pull you off
balance.

• When cutting a limb that is under tension, be alert for

springback so that you will not be struck when the
tension in the wood fibers is released

• Do not cut through nails, rods in the tree, railroad ties

or pallates. Inspect a tree that you are going to cut for
foreign objects that could cause injury or damage to
your chain saw.

• After striking a foreign object, stop the engine and

thoroughly inspect for damage. Repair as necessary.

• Keep the handles dry, clean and free of the oil/fuel

mixture

• We do not recommend using the chain saw in a tree or

on a ladder. 

• All chain saw service, other that the items listed in this

instruction manual maintenance instructions, should
be performed by competent chain saw service
personnel.

• Use the right tool. Only use this chain saw for its

intended purpose, to cut wood.

• Do not overreach. Always keep proper footing and

balance.

• Always hold the unit with both hands when operating.

Keep a firm grip on all handles or grips.

• Apply chain brake prior to any repositioning of the

operator in the cutting area. As an additional safety
precaution, apply the chain brake prior to setting down
the saw.

• Never touch the chain or attempt to service the saw

while the engine is running. Make sure all moving parts
have stopped. Allow the chain saw to cool, as the
chain can be hot.

• Check the bar and chain at frequent intervals for

proper adjustment. Make sure the bar and chain are
properly tightened and sharpened. Visually inspect for
damage. Repair any damage before restarting or
operating the chain saw.

Safety (continued) 

Summary of Contents for COMMERCIAL CS5720

Page 1: ...Professional Landscaping Tools CS5720 20 CHAIN SAW IMPORTANT READ SAFETY RULES AND INSTRUCTIONS CAREFULLY DO NOT THROW AWAY ...

Page 2: ...ntacting the service department Calling Customer Support If you have difficulty assembling this product or have any questions regarding the controls operation or maintenance of this unit please call the Customer Support Department Call 1 877 282 8684 to reach a Customer Support representative Please have your unit s model number and serial number ready when you call See the previous section to loc...

Page 3: ...cates danger warning or caution Attention is required in order to avoid serious personal injury May be used in conjunction with other symbols or pictographs The purpose of safety symbols is to attract your attention to possible dangers The safety symbols and their explanations deserve your careful attention and understanding The safety warnings do not by themselves eliminate any danger The instruc...

Page 4: ...othing protective gloves and eye hearing and head protection devices Avoid accidental starting Be in the starting position whenever pulling the starter rope The operator and unit must be in a stable position while starting See Starting Stopping Instructions Before you start the engine make sure that the saw s chain is not contacting anything Do not cut near electrical cables or power lines Keep al...

Page 5: ...ow the engine to cool before storing or transporting the chain saw over long distances For example let the engine cool before placing the chain saw in an automobile Also be sure to secure the unit while transporting Store the unit in a dry area locked up located up high and located out of the reach of children to prevent unauthorized use or damage Never douse or squirt the unit with water or any o...

Page 6: ...operator s manual for the proper type of oil Safety and International Symbols This operator s manual describes safety and international symbols and pictographs that may appear on this product Read the operator s manual for complete safety assembly operating and maintenance and repair information SYMBOL MEANING ON OFF STOP CONTROL ON START RUN ON OFF STOP CONTROL OFF OR STOP HOT SURFACE WARNING Do ...

Page 7: ...er lockout 4 Half throttle lock 5 Carburetor adjustment screws 6 Inertial brake lever 7 Exhaust muffler 8 Chain 9 Guide bar 10 Air filter cover 11 On off switch 12 Fuel tank cap 13 Starter handle 14 Oil tank cap 15 Primer bulb 16 Decompression valve Know Your Unit Section 2 ...

Page 8: ...eck that the chain brake is not on Remove the bar nuts A and the chain cover B Fig 2 Remove and discard the plastic shim from the bar studs C Fig 3 Bring the chain tensioning pin D fully towards the sprocket E Fig 3 using the chain tensioning screw L Fig 5 Place the bar F onto the studs so that the chain tensioning pin D fits into its seat G Fig 3 Fit the chain H inside the self aligning ring of t...

Page 9: ...the chain by means of the tensioning screw L Fig 5 Hold the tip of the guide bar up and tighten the chain cover nuts securely Fig 7 The chain should be taut but turn freely by hand Fig 8 Wear gloves while accomplishing this task The chain is tensioned correctly when it can be pulled upwards a few millimeters Fig 8 Fitting the Bar Chain continued ...

Page 10: ...f and far away from an open flame Before unscrewing the fuel tank cap position the chain saw on a flat solid surface to prevent fuel spills Only prepare the quantity of mixture for each job do not leave the mixture in the fuel tank or in a fuel canister for prolonged periods CHAIN LUBRICATING OIL Proper chain lubrication during the cutting phase will reduces wear to a minimum between the chain and...

Page 11: ...oke lever D Fig 12A 6 Place the chain saw on the ground in a stable position Check that the chain is free to turn and will not come into contact with any foreign objects 7 Hold the front handle firmly with your left hand and put your right foot onto the base of the rear handle Fig 13 Pull the starter rope slowly until you meet resistance then pull it hard several times 8 When the engine starts put...

Page 12: ... when the chain is cool 1 Turn the chain and lubricate it with additional oil Fig 16 2 Start the saw and allow it to run at moderate speed Check to make sure that the oil pump is working properly Fig 17 3 Stop the engine and adjust the chain tension 4 Start the saw again and make a few cuts in the trunk of a tree to heat up the chain 5 Stop the engine and allow the chain to cool and adjust again 6...

Page 13: ...round range admissible for L and H screws is determined by the manufacturer and you cannot modify it Don t try to force the screws outside the range Idle screw T is adjusted in order to ensure a good safety margin between idle running and clutch engagement Screw L must be adjusted so that the engine promptly responds to sharp accelerations and gives good idle operation Screw H must be adjusted so ...

Page 14: ...t hand on the rear handle and the left hand on the front handle with your thumbs and fingers encircling the chain saw handles A firm grip together with a stiff left arm will help you reduce kickback and maintain control of the saw Make sure that the area in which you are cutting is free from obstructions Do not let the nose of the guide bar contact a log branch fence or any other obstruction that ...

Page 15: ...fore each job check the operating condition of the brake following the steps 1 Start the engine and grasp the handle securely with both hands 2 Pull the throttle lever to maintain the chain operation push the brake lever down toward the front using the back of your left hand Fig 25 3 When the brake operates and the chain is stopped release the throttle lever 4 Release the brake Fig 27 BRAKE MAINTE...

Page 16: ... with the saw regardless of the size of the timber Never push down on the saw when cutting The weight of the saw alone enables it to cut properly with minimum effort Never cut in high wind bad weather when visibility is poor or in very high or low temperatures Always check the tree for dead branches which could fall during the felling operation TREE FELLING Study the tree and surrounding area befo...

Page 17: ... branches are under tension find a safe position to protect yourself in case the branches whip back Always start the cut from the opposite side to the bend When cross cutting do not use the upper edge of the guide bar tip use the middle portion of the bar Using the tip when cross cutting may lead to kickback Wear eye protection during maintenance Cutting Techniques continued 34 33 36 BUCKING When ...

Page 18: ...sa Always sharpen the cutters with outward strokes only Fig 37 observing the values given in Fig 38 After sharpening the cutting links must all have the same width and length A sharp chain produces well defined chips When your chain starts to produce sawdust it is time to sharpen the chain After sharpening the cutters 3 4 times it is important to check the height of the depth gauges If necessary y...

Page 19: ...leaner Fig 41 Check the bar rails frequently for wear If they are sufficiently worn remove the burs and square up the rails using the flat file Fig 42 Never mount a new chain on a worn sprocket Fig 43 Wear eye protection during maintenance AIR FILTER Rotate the knob A Fig 44 and check the air filter B each time you use the chain saw Wash the filter in a clean non flammable detergent liquid e g hot...

Page 20: ... STARTER ASSEMBLY VENT CLEANING Use a brush or compressed air to keep the cooling louvers of the starter assembly free and clean Fig 47 ENGINE DECOMPRESSION VALVE Periodically clean the cylinder fins Fig 48 with compressed air or a brush Dangerous overheating of the engine may occur due to impurities on the cylinder Check the base of the decompression valve clean away any residues which could caus...

Page 21: ...hain brake does not function properly discontinue use until the chain brake is repaired Refer all chain brake service or repair to an authorized servicing dealer GUIDE BAR Turn the guide bar and check that the lubrication holes are free from impurities Fig 51 SPARK ARRESTOR The chain saw is provided with a Spark Arrester System part number em 50012092 Fig 52 complying with the requirements of SAE ...

Page 22: ...no load RPM with bar and chain 2500 2800 min 1 Maximum RPM no load RPM with bar and chain 13000 13500 min 1 Ignition Type Electronic Ignition Switch Rocker Switch Spark Plug Gap 0 02 in 0 5 mm Lubrication Fuel Oil Mixture Fuel Oil Ratio 50 1 Carburetor Diaphragm All Position Number of Pinion Teeth 7 Approximate Unit Weight without bar and chain 5 5 Kg Anti vibration System Yes Inertial Chain Brake...

Page 23: ...Manufacturer s Warranty Coverage The warranty period begins on the date the engine or equipment is delivered to the retail purchaser The manufacturer warrants to the initial owner and each subsequent purchaser that the engine is free from defects in material and workmanship which cause the failure of a warranted part for a period of two years Repair or replacement of warranted part will be perform...

Page 24: ...anty set forth below is given by Cub Cadet Commercial LLC with respect to new merchandise purchased and used in the United States its possessions and territories Cub Cadet Commercial LLC warrants this product against defects in material and workmanship for a period of two 2 years commencing on the date of original purchase and will at its option repair or replace free of charge any part found to b...

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