Homelite CSP3816 - UT74123A Operator'S Manual Download

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Your new chainsaw has been engineered and manufactured to Homelite’s high standard for dependability, ease of operation
and operator safety. Properly cared for, it will give you years of rugged, trouble-free performance.

WARNING:

To reduce the risk of injury, the user must read and understand the operator’s manual.

Thank you for buying a Homelite chainsaw.

SAVE THIS MANUAL FOR FUTURE REFERENCE

OPERATOR’S MANUAL

CSP3816 - UT74123A - 406 mm 16 in. 38cc Chainsaw
CSP4518 - UT74125A - 457 mm 18 in. 45cc Chainsaw
CSP4520 - UT74127A - 508 mm 20 in. 45cc Chainsaw

Summary of Contents for CSP3816 - UT74123A

Page 1: ...ive you years of rugged trouble free performance WARNING To reduce the risk of injury the user must read and understand the operator s manual Thank you for buying a Homelite chainsaw SAVE THIS MANUAL FOR FUTURE REFERENCE OPERATOR SMANUAL CSP3816 UT74123A 406 mm 16 in 38cc Chainsaw CSP4518 UT74125A 457 mm 18 in 45cc Chainsaw CSP4520 UT74127A 508 mm 20 in 45cc Chainsaw ...

Page 2: ...ious injury If you use your saw properly and only for what it is intended you will enjoy years of safe reliable service IMPORTANT Servicing requires extreme care and knowledge and should be performed only by a qualified service technician When servicing use only identical Homelite replacement parts For safe operation read and understand all instructions before using the chainsaw Follow all safety ...

Page 3: ...ft hand on the front handle with 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 kick back occurs 3 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 which could be hit while you are operating th...

Page 4: ...P THE HANDLES dry clean and free of oil or fuel mixture Q Q Q Q Q OPERATE THE CHAINSAW ONLY in well ventilated areas Q Q Q Q Q DO NOT OPERATE A CHAINSAW IN A TREE unless you have been specifically trained to do so Q Q Q Q Q ALL CHAINSAW SERVICE other than the items listed in the instruction manual and all maintenance should be performed by competent chainsaw service personnel For example if improp...

Page 5: ...hat contain cut resistant inserts Secure hair so that it is above shoulderlevel Q Q Q Q Q Wear non slip safety footwear and heavy duty gloves to improve your grip and to protect your hands Q Q Q Q Q Wear eye hearing and head protection when operating this equipment REFUELLING DO NOT SMOKE Q To reduce the risk of fire and burn injury handle fuel with care It is highly flammable Q Q Q Q Q Mix and st...

Page 6: ...s made WARNING All chainsaw service other than items in the operator s manual maintenance instructions should be performed by competent chainsaw service personnel If improper tools are used to remove the flywheel or clutch or if an improper tool is used to hold the flywheel in order to remove the clutch structural damage to the flywheel could occur which could subsequently cause the flywheel to bu...

Page 7: ...nd machine damage Wear eye hearing and head protection when operating this equipment The SAFE T TIP nose guard on the guide bar helps prevent kick back No smoking sparks or open flame Hold and operate the saw properly with both hands Do not operate the saw using only one hand Engines produce carbon monoxide which is an odourless deadly poison Do not operate in an enclosed area Danger beware of kic...

Page 8: ... when mixing fuel or filling fuel tank Petrol Use unleaded petrol intended for motor vehicle use with an octane rating of 87 R M 2 or higher Oil Use 2 cycle oil for air cooled engines Mix Petrol and Oil Mix the fuel mix thoroughly and also each time beforerefuelling ...

Page 9: ...wer ISO 7293 CSP3816 1 6 kW Maximum engine power ISO 7293 CSP4518ANDCSP4520 1 9 kW Maximum engine speed with attachment 12 500 min 1 Idle engine speed 2 600 3 400 min 1 Sound pressure level ISO 7182 CSP3816 99 4 LpA dBA CSP4518andCSP4520 99 4 LpA dBA Sound power level ISO 9207 CSP3816 112 0 LwA dBpA CSP4518andCSP4520 112 0 LwA dBpA Vibration ISO 7505 FrontHandle CSP3816 4 3 M S2 RearHandle CSP3816...

Page 10: ...N BRAKE FRONT HANDLE CYLINDER COVER TRIGGER RELEASE REAR HANDLE THROTTLE TRIGGER ON OFF SWITCH FUEL MIX CAP CHAIN OIL CAP STARTER FAN HOUSING STARTER GRIP SAFE T TIP PRIMER BULB CHOKE LEVER FEATURES SILENCER CARBURETTOR ADJUSTMENT CHAIN CATCHER ...

Page 11: ... logs bigger than the bar length should reinstall the SAFE T TIP as soon as those cuts are complete When cutting without the SAFE T TIP the user must use proper techniques as shown in the manual to avoid kick back NOTE Refer to Maintenance later in this manual for instructions on reinstalling the SAFE T TIP nose guard LOW KICK BACK SAW CHAIN The rakers depth gauges ahead of each cutter can minimis...

Page 12: ...ator If the saw chain is pinched along the top of the guide bar the guide bar can be driven rapidly back toward the operator Either of these reactions may cause loss of saw control which can result in serious injury Do not rely exclusively upon the safety devices built into the saw As a chainsaw user you should take several steps to keep your cutting jobs free from accident or injury OPERATION WAR...

Page 13: ...n contact with the eyes wash them immediately with clean water If irritation is still present see a doctor immediately Q Q Q Q Q Clean up spilled fuel immediately MIXING THE FUEL Q Q Q Q Q This product is powered by a 2 cycle engine and requires pre mixing petrol and 2 cycle oil Pre mix unleaded petrol and 2 cycle engine oil in a clean container approved for petrol Q Q Q Q Q This engine is certifi...

Page 14: ...e tank See Figure 9 2 Fill the oil tank every time you refuel the engine STARTING THE ENGINE WARNING Keep your body to the left of the chain line Never straddle the saw or chain or lean over past the chain line 1 Place the chainsaw on level ground and ensure that no objects or obstructions which could come in contact with the bar and chain are in the immediate vicinity 2 Hold the front handle firm...

Page 15: ...chain brake lever hand guard forward towards the bar to the brake position Refer to Operation Operating Chain Brake foradditionalinformation 4 Set the ignition switch to the RUN I position 5 Fully press and release the PRIMER BULB 7 times 6 Pull CHOKE lever all the way OUT to full position The partial throttle position is automatically set when the choke lever is set at full choke OPERATION Fig 17...

Page 16: ...he throttle trigger while the chain brake is in the brake position Now you are ready to pick up the saw Use the proper grip for both handles refer to Operation for additional information STARTING A WARM ENGINE Follow the instructions for starting a cold engine steps 1 9 but do not attempt to start in the full choke position skip step 5 Push and release primer bulb 7 times Pull the choke out and pu...

Page 17: ...umb be wrapped under the handlebar This grip is least likely to be broken by a kick back or other sudden reaction of the saw Any grip in which the thumb and fingers are on the same side of the handle is dangerous because a slight kick of the saw can cause loss of control WARNING DO NOT operate the throttle trigger with your left hand and hold the front handle with your right hand Never allow any p...

Page 18: ... Q Keep everyone helpers bystanders children and animals a SAFE DISTANCE from the cutting area During felling operations the safe distance should be a least twice the height of the largest trees in the felling area During bucking operations keep a minimum distance of 4 5 m 15 ft between workers ADJUSTING THE CARBURETTOR Before adjusting the carburettor clean the air filter and the starter cover ve...

Page 19: ...OPERATING THE CHAIN BRAKE Refer to Safety earlier in this manual for additional information Check the operating condition of the chain brake before each use 1 Start the engine and grasp the front and rear handles securely with both hands 2 Pull the throttle trigger to bring the chainsaw up to full speed Using the back of your left hand engage the chain brake by pushing the chain brake lever hand g...

Page 20: ...ut trees near electrical wires or buildings Q Q Q Q Q Consider the direction in which the tree leans Q Q Q Q Q Check the tree for damaged or dead branches which could fall and hit you during felling Q Q Q Q Q Periodically glance at the top of the tree during the back cut to assure the tree is going to fall in the desireddirection Q Q Q Q Q Keep all bystanders at a safe distance at least twice the ...

Page 21: ...is blocked Clear the immediate area round the tree and make sure there are no obstructions in your planned path of retreat Clear the path of safe retreat approximately 135 from the planned line of fall 2 Consider the force and direction of the wind the lean and balance of the tree and the location of large limbs These things influence the direction in which the tree will fall Do not try to fell a ...

Page 22: ...mp See Figure 32 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 See Figure33 When bucking or felling with a wedge it may be neces sary to remove the SAFE T TIP anti kick back dev...

Page 23: ...uide bar nose and chain during cutting this can cause kick back To avoid the danger keep the SAFE T TIP anti kick back device attached while cutting Refer to Safety Kick back earlier in this manual Q Q Q Q Q During bucking operations stand on the uphill side so that the cut off section of the log cannot roll over you Q Q Q Q Q Sometimes it is impossible to avoid pinching with just standard cutting...

Page 24: ...ING See Figure 38 Begin on the top side of the log with the bottom of the saw against the log exert light pressure downward Note that the saw will tend to pull away from you UNDER BUCKING See Figure 38 Begin on the under side of the log with the top of the saw against the log exert light pressure upwards During under bucking the saw will tend to push back at you Be prepared for this reaction and h...

Page 25: ...e bark from the main member See Figure 39 1 Under buck the branch one third through for your first cut 2 Over buck the branch to drop it 3 Finish by cutting smoothly and neatly against the main member so the bark will grow back to seal the wound WARNING If the limbs to be pruned are above chest height hire a professional to perform the pruning CUTTING SPRING POLES See Figure 40 A spring pole is an...

Page 26: ...this section 1 Always place the switch in the stop O position before you work on the saw 2 Make sure the chain brake is not set by pulling the chain brake lever hand guard towards the front handle to the RUN position 3 Wear gloves when handling the chain and bar These components are sharp and may contain burrs 4 Remove the bar mounting nuts using a combination wrench or 5 8 in spanner 5 Remove the...

Page 27: ... a loop at the back of the bar 9 Hold the chain in position on the bar and place the loop round the sprocket 10 Fit the bar flush against the mounting surface so that the bar studs are in the long slot of the bar NOTE When placing the bar on the bar studs ensure that the adjusting pin is in the chain tension pin hole CUTTERS CHAIN ROTATION CHAIN DRIVE LINKS BAR GROOVE CHAIN DRIVE LINKS ADJUSTING P...

Page 28: ...elease the tip of the guide bar and turn the chain tensioning screw half a turn clockwise Repeat this process until sagging does not exist CHAIN TENSIONING SCREW Fig 48 17 Hold the tip of the guide bar up and tighten the bar mounting nuts securely The chain is correctly tensioned when there is no sagging on the underside of the guide bar and the chain is snug but can be turned by hand without bind...

Page 29: ...e To help determine the correct warm chain tension the tip of the combination wrench can be used as a guide See Figures 52 53 and54 NOTE New chain tends to stretch check the chain tension frequently and tension as required CAUTION A chain tensioned while warm may be too tight when cool Check the cold tension before next use FLATS ON DRIVE LINKS Fig 52 CHAIN MAINTENANCE CAUTION Check that the switc...

Page 30: ...ke towards the front corner of the tooth 6 Lift the file away from the steel on each return stroke 7 Put a few firm strokes on every tooth File all left hand cutters in one direction Then move to the other side and file the right hand cutters in the opposite direction 8 Remove filings from the file with a wire brush Fig 58 RAKER DEPTH GAUGE CLEARANCE Fig 57 Q Raker depth gauge clearance See Figure...

Page 31: ...cause excessive engine speed during cutting which may result in severe engine damage WARNING Improper chain sharpening increases the potential of kick back WARNING Failure to replace or repair a damaged chain may cause serious injury WARNING The saw chain is very sharp Always wear protective gloves when performing maintenance to the chain MAINTENANCE ...

Page 32: ...e depth gauge at a clearance of 0 6 mm 0 025 in Use a depth gauge tool for checking the depth gaugeclearances Q Every time the chain is filed check the depth gaugeclearance INCORRECT MORE THAN 30 TOP PLATE FILING ANGLE LESS THAN 30 Fig 63 30 CORRECT INCORRECT BACKWARD SLOPE SIDE PLATE FILING ANGLE HOOK Fig 64 80 CORRECT Q Use a flat file and a depth gauge jointer to lower all gauges uniformly Use ...

Page 33: ... GUARD CAUTION Make sure the chain has stopped before you do any work on the saw WARNING Although the guide bar comes with a SAFE T TIP anti kick back device already installed be sure to check the tightness of the mounting screw before each use Tighten the mounting screw of the nose guard as instructed below These are specially hardened screws If you cannot install the screw tightly replace both t...

Page 34: ...he tabs and twist as shown in the illustration 8 Lift the air filter off the air filter base Choose one of the following cleaning options 9 To lightly clean tap the filter against a smooth flat surface to dislodge most saw dust and dirt particles 10 For a more thorough cleaning clean in warm soapy water rinse and let dry completely NOTE An alternative method is to clean the filter with compressed ...

Page 35: ...N CYLINDER FINS CLEAN FLYWHEEL FINS Fig 75 Fig 76 FUEL FILTER Fig 77 REPLACING THE SPARKING PLUG This engine uses a Champion RCJ 4 with 0 63 mm 0 025 in electrode gap Use an exact replacement and replace every six months or more frequently if necessary 1 Loosen the sparking plug by turning it anticlockwise with a spanner 2 Remove the sparking plug 3 Hand thread the new sparking plug turning it clo...

Page 36: ...0 60 mm 0 025 in or worn halfway through Q Q Q Q Q Always keep the chain brake mechanism clean and lightly lubricate the linkage Q Q Q Q Q Always test the chain brake performance after servicing or cleaning Refer to Operation Operating Chain Brake earlier in this manual for additional information Q Q Q Q Q Check and if damaged replace the chain catcher STORING THE CHAINSAW 1 MONTH OR LONGER 1 Drai...

Page 37: ...r spark at sparking plug tip If there is no spark repeat test with a new sparking plug 2 With the ignition switch off remove sparking plug Move choke lever to run position pushed in com pletely and pull starter cord 15 to 20 times This will clear excess fuel from engine Clean and reinstall sparking plug Set ignition switch to run I position Push and fully release primer bulb 7 times Pull starter t...

Page 38: ...to 45 seconds Stop saw and check for oil dripping from SAFE T TIP and guide bar If oil is present the chain may be dull or bar may be damaged If no oil is on the SAFE T TIP contact a Homelite service dealer 1 Release chain brake refer to Operation Operating Chain Brake earlier in this manual 2 Tension chain per instructions in Maintenance Adjusting the Chain Tension earlier in this manual 3 Refer ...

Page 39: ...93 1983 ISO 7505 1986 ISO 7914 1986 ISO 7915 1991 ISO 8334 1985 ISO DIS 9207 1991 ISO 9518 1992 ISO 10726 1992 CISPR 12 1990 Homelite Consumer Products Inc 1428 Pearman Dairy Road Anderson SC 29625 USA January 24 2003 GUARANTEE STATEMENT RTSA RTUK RTG All Homelite products are guaranteed from defects in material and workmanship for a period of twenty four 24 months effective and evidenced from dat...

Page 40: ...stomer Services Anvil House Tuns Lane Henley on Thames RG9 1SA UK Homelite R T S A BP 50012 95945 Roissy CDG Cedex FRANCE Ryobi Technologies Australia PTY Limited 359 361 Horsley Road Milperra NSW 2214 Australia OPERATOR S MANUAL CSP3816 UT74123A 406 mm 16 in 38cc Chainsaw CSP4518 UT74125A 457 mm 18 in 45cc Chainsaw CSP4520 UT74127A 508 mm 20 in 45cc Chainsaw ...

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