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Echo CS-310, Service Manual

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Echo CS-310 Service Manual Download Page 57

ENGINE

CS-310

55

8-5  Removing engine block

1. Remove cylinder cover, sprocket guard, brake 
lever and starter assembly (Refer to “2-1 Disas-
sembling starter assembly”).

2. Remove air 

fi

 lter, cleaner case and carburetor.

3. Remove 

fl

 ywheel (Refer to “3-10 Inspecting 

fl

 y-

wheel and key”).

4. Remove clutch assembly and worm gear (Refer 
to “5-1 Inspecting clutch parts”).

5. Remove muf

fl

 er with muf

fl

 er gasket.

6. Remove two bolts (A) and remove ignition coil 
(B).

7. Remove two bolts (C) of intake insulator (D).

8. Remove 4 bolts (E) from bottom of the unit.

9. Pull out engine block, together with intake insu-
lator (D).

C

D

A

B

E

Summary of Contents for CS-310

Page 1: ...Ord No 401 33 CS 310 ...

Page 2: ...es problems testing remedies and references We recommend you make use of Operator s Manual and Parts Catalogue together with this manual when servicing We are constantly working on technical improve ment of our products For this reason technical data equipment and design are subject to change without notice All specifications illustra tions and directions in this manual are based on the latest pro...

Page 3: ...ase pulse passage 34 4 11 Inspecting metering lever height 34 4 12 Inspecting inlet needle valve 35 4 13 Inspecting diaphragm 36 4 14 Replacing Welch plug 36 4 15 Installing carburetor 37 5 CLUTCH SYSTEM 38 5 1 Inspecting clutch parts 39 5 2 Replacing clutch parts 40 5 3 Installing clutch assembly 40 6 CHAIN BRAKE SYSTEM 42 6 1 Disassembling chain brake 43 6 2 Assembling brake parts 44 7 SAW CHAIN...

Page 4: ... Type Diaphragm horizontal draft with auto return choke Model Walbro WT 946 Venturi size Throttle bore mm in 11 11 14 3 0 437 0 562 Ignition Type CDI Capacitor discharge ignition system Digital magneto Spark plug BPM8Y Starter Type Automatic rewind Rope diameter x length mm in 3 0 x 920 0 12 x 36 2 Fuel Type Premixed two stroke fuel Mixture ratio 50 1 2 Gasoline Minimum 89 octane gasoline Two stro...

Page 5: ... 000 rpm BTDC 14 at 3 000 rpm BTDC 12 at 8 000 rpm BTDC 33 at 10 000 rpm BTDC 35 at 12 000 rpm BTDC 33 PET 9000 Parameter 1 321 2 06 Carburetor Idle adjust screw initial setting turns in 7 8 L mixture needle initial setting turns back 2 1 2 H mixture needle initial setting turns back 2 1 4 Test Pressure minimum MPa kgf cm2 psi 0 05 0 5 7 0 Metering lever height mm in 1 65 0 06 lower than diaphragm...

Page 6: ...e M5 30 50 3 5 26 45 Rear handle assembly M5 30 50 3 5 26 45 Brake lever M4 25 35 2 5 3 5 22 30 Sprocket guard M4 10 20 1 2 9 17 Guide bar M8 200 230 20 23 175 200 Regular bolt nut and screw M3 6 10 0 6 1 5 9 M4 15 25 1 5 2 5 13 22 M5 25 45 2 5 4 5 22 40 M6 45 75 4 5 7 5 40 65 LM Left hand thread Apply special repairing materials Tapping screw Material Location Remarks Adhesive Ball bearing outer ...

Page 7: ...on outer diameter Min 35 91 1 414 C Piston pin bore Max 8 035 0 3163 D Piston ring groove Max 0 6 0 024 E Piston ring side clearance Max 0 1 0 004 F Piston pin outer diameter Min 7 98 0 3142 G Piston ring width Min 1 45 0 057 H Piston ring end gap Max 0 5 0 02 K Con rod small end bore Max 12 000 0 4724 L Crankshaft runout Max 0 01 0 001 M Sprocket bore Max 10 80 0 4252 N Clutch drum bore Max 61 5 ...

Page 8: ...e Removing and crankshaft ball bearings 8 897563 19830 Metering lever gauge Measuring metering lever height on carburetor 9 X686 000000 ThreeBond 1207D Applying crankcase seam 10 900300 Ignition Analyzer PET 9000 Measuring Ignition timing Primary Secondary voltage 11 897726 21430 Oil seal tool Installing oil seals and clutch plate 12 897800 79931 Spark tester Checking ignition system 13 897803 301...

Page 9: ...pression resistance of cylinder and snatch back of engine during starting action 8 When starter rope is released rope reel D is returned together with power spring E and pawl catcher F by rewind spring tension 9 After engine starts starter pawls pivot outward by centrifugal force and disengage from pawl catcher F 2 STARTER SYSTEM i 30 starter A Starter case B Rewind spring C Rewind spring case ass...

Page 10: ...pe in rope reel notch e as shown 5 Rotate rope reel E counterclockwise to release tension of rewind spring 6 Remove screw F 7 Remove pawl catcher G and power spring H 8 Remove rope reel J from starter case K slow ly to prevent rewind spring L from unwinding 9 Remove rewind spring case assembly M from starter case K WARNING DANGER Wear eye protection and take care when removing starter drum Rewind ...

Page 11: ...nd pass the rope through hole of rope reel then press the knot D into recess as shown 3 When installing a new starter rope singe both ends of the rope to prevent fraying 5 Pass the other end of starter rope through start er case then pass starter rope through starter grip and make a knot as shown 6 Tighten knot Push knot into recess of starter grip 4K287 A B C D D ...

Page 12: ... install rewind spring case assembly C on starter case matching hole c with post D Hook a of rewind spring should contact with post E of starter case 3 Assemble rope reel F engaging hook f1 with hook a of rewind spring 4 Check for proper engagement of rewind spring and rope reel by turning rope reel F clockwise and counterclockwise A B E D c C F f1 a a F ...

Page 13: ...ut starter grip to take the rope slack 9 Pull starter several times to check rewind spring tension If starter is not rewinding fully increase spring tension by rotating rope reel one more turn clockwise following above step 8 10 Pull out starter rope all the way and check that rope reel can be rotated an additional half or more turn clockwise as shown to prevent rewind spring from breaking 11 If r...

Page 14: ...o avoid pinching of torsion spring install these parts without setting the end F of torsion spring on starter pawl The bolt is pre coated with sealant on the thread If the sealant is peeled off apply thread locking sealant Loctite 242 Three Bond 1324 or equivalent 4 Using fine wire G or appropriate tool place the end F of torsion spring on pawl B by hooking and passing under pawl as shown Remove f...

Page 15: ...IGNITION SYSTEM CS 310 13 A Flywheel E Spark plug cap B Ignition coil F Switch lead C Spark plug G Ground lead D Spark plug cap coil H Ignition switch 3 IGNITION SYSTEM A B C D E G H F ...

Page 16: ...OK S T OK OK Replace ignition coil Leads connections Not OK OK OK Not OK S T Repair Replace Not OK Remedy Inspect Not OK Flywheel key OK R T End Not OK Flywheel magnet Replace Not OK R T Not OK OK OK Replace ignition coil and or inspect other systems Replace flywheel OK OK Adjust pole shoe air gaps Inspect flywheel magnet at the same time Go to A if OK S T Not OK A S T Spark test R T Running test ...

Page 17: ...ot test near spark plug hole without spark plug installed otherwise there is a chance to ignite fuel mixture inside cylinder Do not touch metal parts of spark tester while performing the test to avoid receiving electrical shock Do not check spark in area where gasoline is spilled or flammable gases may exist 3 3 Inspecting spark plug 1 Remove spark plug to inspect for fouling cracked or broken ins...

Page 18: ...hm meter or multi meter to switch lead Connect the other probe to cylinder fin B 4 When ignition switch is upward ON position tester should indicate infinite resistance 5 When ignition switch is in STOP position tes ter should show that the circuit is in conducting state closed circuit 6 If ignition switch is defective replace with a new one B A A ...

Page 19: ...3 Loosen nut C and remove ignition switch D and ground lead E from the unit Remove switch lead F from ignition switch 4 Assemble switch lead F to new ignition switch 5 Assemble ground lead E and new ignition switch on the unit aligning notch d of ignition switch with tab G of the unit Fasten nut C on ignition switch A B F D E F E G C C d ...

Page 20: ... remove spark plug cap and spark plug cap coil and measure resistance between the conduction wire of high tension lead and ignition coil core 5 Keep probe C on cylinder fin B Remove probe D from spark plug cap coil A and connect it to ignition coil core to confirm that the circuit is in conducting state closed circuit If the circuit is not in conducting state ensure conduction between ignition coi...

Page 21: ...lts B as shown Set air gap Refer to 3 9 Setting pole shoe air gaps Tighten two bolts B 7 Connect spark plug cap to spark plug Reinstall disassembled parts 3 7 Replacing spark plug cap and coil 1 Disconnect spark plug cap A from spark plug 2 Apply some oil in spark plug cap A for easy re moval from high tension lead B 3 Pull spark plug cap away from high tension lead 4 Inspect spark plug cap coil C...

Page 22: ...ove nut B by rotating counterclockwise 3 9 Setting pole shoe air gaps 1 Insert Module air gap gauge 91004 A or 0 3 0 4 mm 0 012 0 016 in thick feeler gauge be tween flywheel and ignition coil shoes 2 Rotate flywheel until magnetic poles of flywheel face ignition coil shoes 3 Hold ignition coil against flywheel and tighten the bolts to specified torque Refer to Service in formation 1 3 Torque limit...

Page 23: ...y to re move flywheel 7 Inspect woodruff key for damage or shearing Replace as required 8 Wipe off oil from taper part of crankshaft and fly wheel before assembling flywheel 9 Install woodruff key into key groove 10 Reinstall starter pawls Refer to 2 4 Replacing starter pawl 11 Align flywheel key groove with woodruff key on crankshaft Install flywheel and fasten flywheel nut clockwise C ...

Page 24: ...EM A Fuel cap B O ring C Connector D Fuel tank E Fuel tank vent F Fuel strainer G Fuel line H Fuel return line J Grommet K Air filter L Cleaner case M Carburetor N Purge bulb O Purge line P Cylinder cover L D E O A B F C N M G H J P K ...

Page 25: ...d air Eye damage can occur from flying particles 4 If heavily blocked with dirt or dust clean air filter with compressed air 5 Replace air filter with new one if heavily soiled or damaged 4 2 Inspecting fuel cap and fuel strainer 1 Remove fuel cap 2 Inspect fuel cap for cracks and O ring A for cuts or damage and replace with new one as re quired 3 Replace connector B if damaged 4 Pull fuel straine...

Page 26: ...with longnose pliers as shown NOTE Wrap the ends of longnose pliers with tape or cover with soft pipes to protect fuel line from damage 7 Apply pressure approx 49 kPa 0 5 kgf cm2 7 psi 8 If pressure drops replace fuel line 9 Put fuel strainer in fuel tank and fasten fuel cap securely 10 Apply pressure approx 9 8kPa 0 1 kgf cm2 1 4 psi 11 Pressure should not drop If pressure drops leakage may occur...

Page 27: ...tank vent A from fuel tank and connect pressure tester 91024 B 2 Apply pressure approx 49 kPa 0 5 kgf cm2 7 psi Make sure pressure is stable in range of 9 8 39 2 kPa 0 1 0 4 kgf cm2 1 4 5 7 psi 3 If it is not in the range gently clean tank vent with compressed air or replace with new one NOTE Do not disassemble valves in tank vent as sembly Damage to valves will occur 4 Apply negative pressure 19 ...

Page 28: ...ntly clean tank vent with compressed air or replace with new one NOTE Do not disassemble valves in tank vent as sembly Damage to valves will occur 4 Remove cap C of tank vent and clean sponge D 5 Cut pipe 363011 00210 E 7x11x170mm and 382011 01110 F 9x13x350 in approx 30mm 1 1 4 in length and connect them to pressure tester as shown Connect tank vent A without cap to pipe as shown 6 Plug hole a wi...

Page 29: ...e C and purge line D from carburetor 4 Remove purge line D and fuel return line E from purge bulb 5 Push down hook F and remove purge bulb 6 Install new purge bulb 7 Connect fuel return line E to longer fitting G placing fuel return line in the bottom of groove H of the unit 8 Connect purge line D to the other fitting J Place purge line in groove H A B F E D E D G C D J H ...

Page 30: ... and clip D from fuel line A 5 Remove grommet E from the unit together with fuel line A and fuel return line B 6 Install fuel line A and fuel return line B on grommet E as shown 7 Install assembled grommet on the unit NOTE Assemble grommet with fuel return line B oriented towards rear handle 8 Pull out fuel line from fuel tank and install clip and fuel strainer to fuel line 9 Reinstall carburetor ...

Page 31: ...two minutes alternating rpm between WOT and idle every 5 seconds Adjust idle adjust screw to 3 200 200 rpm Adjust H mixture needle to 12 500 300 rpm with limiter cap If engine does not run correctly after this adjustment proceed to the next step 2 2 IMPORTANT After adjusting carburetor according to the steps 2 2 and 2 3 the limiter cap s must be installed on L and H mixture needle s to comply with...

Page 32: ...ap in place 4 Screw 2 5 mm limiter cap removal tool P N 89801 counterclockwise into center hole of re maining limiter cap until the limiter cap is removed from the mixture needle completely Remove the limiter cap from limiter cap removal tool by turning clockwise then screw limiter cap removal tool into center hole of previous limiter cap to remove com pletely 5 Turn L and H mixture needle clockwi...

Page 33: ... the H mixture needle clockwise in 1 8 turn increments with the engine at idle Af ter each adjustment accelerate to WOT and check rpm The final rpm should fall within 12 750 12 950 rpm 6 After adjusting carburetor screw new limiter cap counterclockwise on the limiter cap removal tool C P N 89801 approx 2 turns as shown and put the limiter caps on L and H mixture needles respectively Then gently pr...

Page 34: ...cover A 2 Picture shows warm weather position of winter plug B 3 Remove winter plug B to open vent opening C and introduce warm air from cylinder side to carbu retor box 4 Place winter plug B in storage position D NOTE In order to avoid carburetor vapor lock return winter plug B to warm weather position when temperature is above freezing B A B C D ...

Page 35: ... kPa 0 5 kgf cm2 7 psi 5 If reading does not drop inspect inlet needle valve for sticking or metering lever height is too low 6 If pressure drops at step 2 or if pressure drops below standard figure at step 4 remove carburetor from the unit disconnecting purge line throttle rod and choke rod 7 Submerge carburetor in suitable clean solvent to locate the leak by applying pressure approx 98 kPa 1 kgf...

Page 36: ... necessary gently bend metering lever up or down to set metering lever to proper position NOTE When metering lever is Too high Fuel flooding occurs Too low Fuel starvation overheating occurs 1 6 5 0 4 1 35 1 5 4 10 Inspecting crankcase pulse passage 1 Drop a little oil in pulse hole A on intake bel lows B 2 Remove spark plug and pull starter grip several times Oil should spit back from the hole 3 ...

Page 37: ...ws Improper assembling of metering lever and spring Dirt between inlet needle valve and valve seat Worn inlet needle valve tip 3 Clean inlet needle valve seat using suitable clean solvent do not use metal tools 4 Reassemble inlet needle valve spring metering lever and pivot pin NOTE Insure proper metering lever installation as follows 1 Spring is seated in its hole at chamber floor 2 Spring is und...

Page 38: ... seated and remove inlet needle valve Otherwise main nozzle check valve and inlet needle valve spring may be damaged by the compressed air 4 14 Replacing Welch plug If engine does not run smoothly even after read justing carburetor and inspecting carburetor parts inspect low speed ports on carburetor as follows 1 Remove metering lever and related parts to pro tect them from damage 2 To remove Welc...

Page 39: ... C Connect purge line D to carburetor fuel outlet E 3 Connect choke rod F to carburetor Install choke rod to the unit with choke grommet G 4 Install carburetor together with gasket H and cleaner case J with two bolts passing throttle rod A through notch j of cleaner case 5 Secure cleaner case J with screw K A B C D E H F G A J K j A j ...

Page 40: ... SYSTEM CS 310 38 5 CLUTCH SYSTEM A Worm gear B Clutch plate C Clutch plate D Clutch spring E Clutch shoe F Clutch hub G Clutch assembly H Needle bearing J Clutch drum K Washer L E Ring J K E D C B A G F L H ...

Page 41: ...7537 30130 G in spark plug hole to stop crankshaft rotation 6 Rotate clutch assembly H clockwise by hand until it cannot be rotated further 7 Loosen clutch assembly Left hand thread ro tating clockwise with clutch tool 897505 16133 J and remove it NOTE Do not use power tools Otherwise piston damage may occur 8 Remove two clutch plates and worm gear 9 Inspect clutch shoes for wear and spring for we...

Page 42: ...urned further NOTE If starter assembly is installed untie tempo rary knot holding starter grip tied in the first NOTE of 5 1 Inspecting clutch parts While holding starter grip turn clutch assembly counterclockwise until it cannot rotate further piston touches piston stopper 5 Tighten clutch assembly with clutch tool 897505 16133 E 5 2 Replacing clutch parts 1 Install clutch spring A to clutch shoe...

Page 43: ... crankshaft placing the hands a of worm gear A in cutouts g of clutch drum 7 Install washer H facing flat side not convexed side to clutch drum G 8 Install new E ring J facing rounded edge side to washer H Use a new E ring every time E ring is removed 9 Remove piston stopper and reinstall all removed parts flat side convexed side smoother side F G H J g g H J ...

Page 44: ...S 310 42 6 CHAIN BRAKE SYSTEM A Brake lever B Collar C Washer D Torsion spring E Spacer F Brake cover G Brake connector H Spacer J Spacer K Compression spring L Brake band M Roller N Engine cover G E F D C A H K J N B L M ...

Page 45: ...and from injury 1 Move brake lever A to chain brake engaging position 2 Remove sprocket guard B and brake lever NOTE Make sure that lever C is in engaging po sition before removing brake cover D otherwise compression spring may jump out 3 Loosen three screws securing brake cover D and remove brake cover 4 Inspect all the brake parts for damage Replace them as required A B C D ...

Page 46: ...ine cover as shown in the left pic ture Make sure the pin c1 of brake connector C is engaging with the groove F of engine cover 3 Slide in compression spring G to the end c2 of brake connector as sown 4 Push compression spring G with longnose pli ers etc and install compression spring in engine cover as shown in the below picture 5 Apply molybdenum grease on entire compres sion spring and other fr...

Page 47: ...quired 3 Pull oil strainer B from oil tank using a wire hook C 4 Remove oil strainer B from oil line D and clean oil strainer in suitable solvent or replace if damaged 7 SAW CHAIN LUBRICATION SYSTEM A Oil cap B O ring C Connector D Oil tank vent E Engine cover e Oil tank F Oil strainer G Grommet H Oil line J Joint pipe K Oil grommet L Auto oiler assembly e A B F C D E G H K J L A B C D B ...

Page 48: ...a vacuum from forming in oil tank when chain oil in the tank is con sumed 1 Remove starter assembly 2 Remove oil tank vent A using paper clip and clean it 3 Check that oil tank vent lips B are not hard or deformed Replace as required 4 Install oil tank vent A using suitable tool C as shown A C A B ...

Page 49: ... oil line F with joint pipe G from oil grommet H 7 Connect pressure tester 897803 30133 J to joint pipe G as shown 8 Tighten oil cap and apply pressure approx 9 8 kPa 0 1kgf cm2 1 4psi 9 Pressure should not drop If the pressure drops leakage may occur at oil cap oil cap O ring mat ing surface of oil tank oil line grommet or oil tank vent Inspect them and replace defective part s with new parts as ...

Page 50: ...pe D and new oil grommet A as shown 6 Assemble grommet C in grommet hole E of engine cover 7 Assemble oil grommet A on engine cover NOTE In order to assemble oil grommet easily in sert oil outlet a1 in auto oiler hole F Then push tab a2 into square hole G 8 Pull out the other end b of oil line as shown 9 Install oil strainer H to the other end b of oil line 10 Put oil strainer and oil line in oil ...

Page 51: ... Y089 000130 to remove auto oiler Y089 000130 3 Set distance B of Y089 000130 to 15 20 mm 0 59 0 79 in 4 Put bolt C through washer D as shown Put bolt C through pipes E and F 5 Screw bolt tip c into the bore of Auto oiler A 6 Holding inner pipe E with a wrench G rotate outer pipe F anticlockwise by another wrench to pull out auto oiler B D E A C F G A c E F ...

Page 52: ... oiler H in engine cover aligning oil groove h with the rib J NOTE If oil groove is not aligned with the rib chain oil does not flow 8 Set tip k of auto oiler installer X646 000030 K in the bore of new auto oiler H 9 Tap auto oiler installer K with small metal hum mer until it bottoms h K J H H k K ...

Page 53: ...se B Crankcase Lower crankcase C Crankshaft assembly D Ball bearing E Oil seal F Engine cover G Piston ring H Snap ring J Piston K Piston pin L Piston pin spacer M Intake bellows N Intake bellows retainer O Intake insulator F D B N G A C H K J L M O E ...

Page 54: ... exhaust port piston crown and muffler for carbon deposits NOTE Compression pressure varies with volume of compression gauge tip occupying cylinder combus tion chamber If gauge tip volume is considerably different from spark plug volume it is recommended to measure and note compression pressure of brand new engines as standard pressure in advance 8 2 Cleaning cooling air passages 1 Remove cylinder...

Page 55: ...Dead Center TDC to prevent carbon from entering cylinder Do not use metal tool and be careful not to scratch piston or cylin der NOTE Replace muffler gasket with new one when removing muffler 4 Remove muffler lid A and spark arrestor screen B from muffler 5 Remove carbon deposits from spark arrestor screen and muffler lid If screen has heavy depos its replace with new one 6 Reinstall spark arresto...

Page 56: ...essure connec tor 897835 16131 E to spark plug hole 7 Connect pressure tester 91024 F to pressure connector E 8 Apply pressure approx 9 8 kPa 0 1 kgf cm2 1 4 psi by pressure tester NOTE Do not exceed 30 kPa 0 3 kgf cm2 4 3 psi Otherwise damage to oil seal may occur 9 If the reading drops leakage may occur 10 Leakage may occur from crankcase seam or oil seal Use soapy water to locate leakage 11 The...

Page 57: ...e and carburetor 3 Remove flywheel Refer to 3 10 Inspecting fly wheel and key 4 Remove clutch assembly and worm gear Refer to 5 1 Inspecting clutch parts 5 Remove muffler with muffler gasket 6 Remove two bolts A and remove ignition coil B 7 Remove two bolts C of intake insulator D 8 Remove 4 bolts E from bottom of the unit 9 Pull out engine block together with intake insu lator D C D A B E ...

Page 58: ...oth crankshaft ends using plastic mallet to remove lower crankcase with crankshaft and piston assembly 4 Inspect cylinder combustion chamber and clean with a plastic or wooden scraper if carbon is found NOTE Do not use metal tools or damage to cylin der wall may result 5 Inspect cylinder wall and replace with new one if plating is worn peeled away scored or exposing cylinder base metal C A B C ...

Page 59: ... Remove snap rings from both sides of piston pin 5 Push piston pin out from piston NOTE If piston pin is tight use piston pin tool 897702 30131 B with adapter C stamped 8 on an end 6 Inspect needle bearing and washers and re place if wear or discoloration is noted 8 8 Inspecting crankcase and crankshaft 1 Clean crankcase Replace as a set of cylinder and crankcase if damaged 2 Completely remove sea...

Page 60: ...ing bearing wedge A 897701 02830 3 Install new ball bearing s onto crankshaft us ing bearing seal tool 897726 21430 B Bearing should be completely seated against crankshaft counterweights NOTE Preheat ball bearing using heating gun heat lamp or suitable heater for easier installation 4 Install oil seals onto both ends of crankshaft in suring proper direction of oil seal B A ...

Page 61: ...ped 8 through piston with piston pin spacers set at step 1 3 Insert piston pin in piston pushing out pin guide tool until the pin end comes up to snap ring groove E NOTE If piston pin is tight use piston pin tool 897702 30131 with pusher adapter stamped 8 4 Install new snap rings on both end of piston pin Make sure that they are properly seated in snap ring grooves NOTE Always use new snap rings 5...

Page 62: ...OTE When installing piston in cylinder do not twist cylinder to avoid breakage of piston ring and scoring cylinder bore 4 Make sure that rims of oil seal are properly seat ed in the grooves of cylinder upper crankcase 5 Apply liquid gasket ThreeBond 1207D Parts No X686 000000 or equivalent on seams C of lower crankcase 6 Apply adhesive Loctite 675 or equivalent on bearing bores D of lower crankcas...

Page 63: ...Install flange a2 of intake bellows in the hole c of intake insulator C 3 Mount engine block on engine cover D while installing intake insulator C into the grooves d of engine cover 4 Tighten 4 bolts E at unit bottom to secure en gine block to engine cover Tighten 2 screws F of intake insulator Install all other removed parts A B a1 b C D c a2 C d E F ...

Page 64: ...A and pry away rear handle cover from rear handle 2 Inspect rear handle cover A and throttle lock out B for cracking or wear If damaged replace it as required 3 Push out spring pin C from rear handle using spring pin tool 897724 01361 D NOTE Spring pin will stop before completely coming off from rear handle because of effective length of spring pin tool 4 Remove throttle trigger E together with to...

Page 65: ...e 2 Hold throttle trigger E with torsion spring F in place and insert spring pin tool 897724 01361 D from the other side of handle through the hole of throttle trigger 3 Lightly tap in spring pin C pushing out spring pin tool D 7 Hook the inside tab a2 of rear handle cover A on the notch g of rear handle G 8 Push in hook a1 and install rear handle cover A on rear handle G setting torsion spring F ...

Page 66: ...e unit Refer to 7 3 Inspecting oil line 3 Inspect cushions for cracking or wear If dam aged replace with new cushions as follows 4 Remove cushion A with needlenose pliers from bottom of the unit 5 Apply lithium based grease on outer surface a of cushion toe then install cushion by pushing into the hole B 6 Reassemble front handle and rear handle to the unit Reassemble all related parts A B a ...

Page 67: ...GUIDE BAR MOUNTING SYSTEM CS 310 65 10 GUIDE BAR MOUNTING SYSTEM A Sprocket guard B Tensioner screw C Chain tensioner D Collar E Bevel gear F Bevel gear B E F C D A ...

Page 68: ...ct them for damage or wear Replace as required 3 Install bevel gear F into sprocket guard 4 Screw chain tensioner D on tensioner screw C 5 Set bevel gear E in collar B and insert ten sioner screw C with chain tensioner D in bevel gear E with collar B 6 Install sub assembled tensioner screw in slot G of sprocket guard confirming engagement of bevel gear E and F 7 Reinstall bolt A A B C D E F G A E ...

Page 69: ... If it is hard to remove or broken stud is too short for tightening two nuts hold defective stud by vise and turn the chain saw body counterclock wise or use a suitable stud remover 3 Install two nuts on new stud and tighten them against each other NOTE Apply a small amount of thread locking sealant in the thread hole locktite 675 or equiva lent 4 Turn nut B clockwise to install stud A B ...

Page 70: ...essive Engine does not stop Oiler does not function Saw chain does not cut well INSPECTING Starter system Starter drum rope Ignition system Sparks Spark plug Spark plug cap coil Ignition switch Ignition coil Pole shoe air gaps Flywheel 2 2 3 2 3 3 3 7 3 4 3 6 3 8 3 9 3 10 Continued 15 Inspecting first 14 13 12 11 10 09 08 07 06 05 04 03 02 01 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 Flywheel k...

Page 71: ...4 7 1 8 2 8 3 1 2 8 1 8 4 8 4 8 6 8 7 Fuel tank line vent Purge bulb 4 3 to 4 6 INSPECTING 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 REFERENCES Carburetor diaphragms 4 13 Crankcase pulse passage 4 10 Throttle trigger 9 1 Fuel octane freshness purity 4 7 1 Others Chain brake Cushions Saw chain 6 1 6 2 9 2 Replace Sharpen 15 14 13 12 11 10 09 08 07 06 ...

Page 72: ...lywheel 3 10 Carburetor 4 9 4 11 to15 Clutch side oil seal 8 9 Starter side ball bearing 8 9 Starter side oil seal 8 9 Crankshaft 8 8 8 10 Clutch side ball bearing 8 9 Ignition coil 3 8 Front handle Rear handle 9 1 Auto oiler 7 5 Muffler 8 3 Starter assembly 2 1 Sprocket guard 2 1 5 1 6 1 Cylinder cover Clutch drum 5 1 5 3 Air filter Cleaner case 4 1 4 3 Clutch assembly Worm gear 5 1 5 3 ...

Page 73: ... Fuel tank Clean inside 4 3 Muffler and exhaust port Clean 8 3 Starter system Inspect Repair 2 1 to 2 4 Oil tank Clean inside Oil strainer Clean Replace 7 1 Sprocket Inspect Replace 1 5 5 1 Guide bar Inspect Clean Chain brake Inspect Repair 6 1 6 2 Daily Inspecting in every services IMPORTANT Service intervals shown above are maximum Actual use and your experience will determine the frequency of r...

Page 74: ...20 55 Ignition switch 4 13 15 to 17 52 Ignition system 3 6 13 15 Ignition timing 3 6 Inlet needle valve 33 35 36 Intake bellows 34 51 54 61 Intake insulator 4 51 55 56 61 Key flywheel 20 21 55 L mixture needle 3 29 to 31 Limiter cap 6 29 to 31 Liquid gasket 4 60 Maintenance guide 68 Metering diaphragm 34 36 Metering lever 3 6 33 to 36 Metering lever height 3 6 33 34 Minimum secondary voltage 3 Muf...

Page 75: ...Printed in Japan 1101 ...

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