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TROUBLESHOOTING

48 –English

Starting

Idling (low rpm)

Idling (low rpm) (cont.)

Adjust L screw
Leaking air intake hose (rubber)
Loose carburettor mounting bolts
Loose or faulty fuel hose
Fuel fi lter blocked
Fuel line blocked
Fuel tank vent blocked
Throttle valve pivot stiff
Throttle pushrod sticking
Defective throttle return spring
Bent throttle stop
Faulty diff user jet

Adjust L screw
Worn needle valve
Needle valve set too high
Worn needle valve lever
Leaking control diaphragm/cover plate
Needle valve assembly sticking

Will not idle

Idling too rich

Troubleshooting

The various faults that can aff ect a chainsaw are divided into four groups. In each group the likely
symptoms are given on the left and possible causes are listed on the right. The most likely faults are given fi rst, and so on.

Worn needle valve
Leaking control diaphragm/cover plate
Needle valve assembly sticking
Worn needle valve lever
Faulty diff user jet

Fuel fi lter blocked
Fuel line blocked
Leaking air intake hose (rubber)
Loose carburettor mounting bolts
Worn throttle valve pivot
Loose throttle valve screw
Worn throttle valve
Needle valve assembly sticking
Leak in metering system (air or fuel)
Metering system centre knob is worn
Hole in diaphragm
Leaking control diaphragm/cover plate
Crankcase leaking

Fuel line blocked
Needle valve set too high
Needle valve assembly sticking
Leak in metering system (air or fuel)
Leaking control diaphragm/cover plate
Faulty diff user jets
Crankcase leaking

Needle valve set too high
Needle valve assembly sticking
Metering system damaged
Worn needle valve
Leaking control diaphragm/cover plate
Metering system incorrectly assembled

Diffi

culty starting

Carburettor leaking
fuel

Flooding when eng-
ine not running

Adjust L screw
Air fi lter blocked
Choke not working
Worn choke pivot
Worn choke valve
Fuel fi lter blocked
Fuel line blocked
Piston ring seized
Blocked impulse channel

Loose or faulty fuel pipe
Hole in diaphragm
Worn needle valve
Needle valve assembly sticking
Needle valve set too high
Leak in metering system (air or fuel)
Loose cover on carburettor
pump side

Worn needle valve
Needle valve set too high
Needle valve assembly sticking

Idles when L screw
closed

Idling uneven

L screw requires
constant adjustment

Too much fuel at
idling

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Содержание GZ7100

Страница 1: ...Workshop Manual English GZ7100...

Страница 2: ...without prior notice Introduction 1 Safety regulations 2 Symbols 3 Technical data 4 Service tools 6 Service information 10 Safety equipment 12 Recoil starter 16 Electrical system 18 Centrifugal clutch...

Страница 3: ...ems the manual should always be read together with all service announcements that apply to the specific model of chainsaw Changes Arrangement Repair of a specific sub assembly When a specific sub asse...

Страница 4: ...Do not use the saw before it has been adjusted so that the chain is still when idling After testing do not touch the silencer until it has cooled Risk for burns Inadequate lubrication of the chain ca...

Страница 5: ...tion adjuster Saw chain filler Chain brake Dekompression valve Symbols on the saw Symbols in this manual The markings shown below are moulded into the chainsaw casing This symbol indicates a risk of p...

Страница 6: ...4 3 50 1 97 36 1 42 4 1 5 6 10 200 Guidebar length Maximum chain speed Chain pitch Drive link gauge cm inches m s mm inches mm inches GZ7100 38 69 15 27 30 2 9 52 3 8 1 5 0 058 1 3 0 050 Sparkplug gap...

Страница 7: ...m rpm rpm GZ7100 2 700 3 500 13 300 NGK BPMR7A Weight without bar and chain Hand grip heater Electric carburettor kg lbs heater GZ7100 6 4 14 1 Fuel tank volume Oil pump capacity Oil tank volume Autom...

Страница 8: ...SERVICETOOLS 8 English 1 2 4 5 10 11 12 13 14 15 17 18 6 7 9 8 3...

Страница 9: ...r gauge air gap Setting ignition unit 502 51 34 02 17 Extractor Removing large AV springs 502 52 18 02 18 Tachometer Setting the carburettor 502 71 14 01 19 Test spark plug Testing ignition unit 502 7...

Страница 10: ...lish Lubricate with two stroke oil Lubricate with saw chain oil Lubricate with grease Figures next to components which are attached using bolts give the appropriate tightening torques in Nm Key to dia...

Страница 11: ...SERVICE DATA English 11 Allen screws...

Страница 12: ...mm 8 10 Nm T27 x4 12 14 Nm T27 6 7Nm T27 3 4Nm T27 3 4Nm T27 1 2Nm T10 1 2Nm T10 1 2Nm T10 1 2Nm T10 1 2Nm T10 1 2Nm T10 Lubricate with two stroke oil Lubricate with saw chain oil Lubricate with greas...

Страница 13: ...4Nm T27 5 6Nm T27 3 4Nm T27 7 9Nm T27 3 4Nm T27 8 10Nm T27 x6 7 8Nm T27 2 5 3 5Nm T27 2 3Nm T27 x1 6 7Nm T 27 3 4Nm T27 x4 4 5Nm T27 x3 1 1 5Nm T10 8 10Nm T27 3 4Nm T27 8 10 Nm T27 5 6Nm T27 7 8Nm T27...

Страница 14: ...vingonthe starter side See fig 2 4 Remove bolt A and chain guide plate See fig 1 5 Undothefourbolts B andremovethechainbrake assembly cover See fig 1 6 Press down the retaining bush C and remove the l...

Страница 15: ...h the fol lowing instructions Checking brake operation Assemble the chain brake as follows 1 Reattach the toggle joint and brake strap See fig 5 2 Grease the toggle joint E moving parts and locate the...

Страница 16: ...isequippedwithasparkguard thisshould be removed See fig 9 Chain catcher Inspection Clean all components and check the following 1 The spark guard is undamaged 2 Thesilencerandsilencermountarenotcracke...

Страница 17: ...ver and cable and locate them in the tank unit Ensure that the cable lever arm E is between the lip D and the under side of the hand grip See fig 15 2 Press home the throttle lever pivot B with the he...

Страница 18: ...he flywheel are undamaged spring back towards the centre and move freely WARNING Make sure that the recoil spring does not fly up and cause personal injury WARNING If the recoil spring is tensioned wh...

Страница 19: ...d through See fig 5 4 Grease the cord pulley bearing and recoil spring and then fit the pulley onto the spindle Turn the pulley gently backwards and forwards until the recoil spring catches on the sto...

Страница 20: ...dremovethetwopawls E fortherecoil starter See fig 1 6 Removethesparkplugandfitthepistonstoptoolin the spark plug hole See fig 2 7 Releasetheflywheelnut Undothenutuntilitisin line with the thread on th...

Страница 21: ...module and flywheel magnet The clearance applies only to the two lower pegs on the ignition module See figs 6 and 7 6 Push the ignition module towards the flywheel and tighten the bolts to 4 Nm 7 Fit...

Страница 22: ...earhandgrip element 5 Connect the ohmmeter as shown in fig 10 and measure the resistance in the front handleheatingelement Themetershouldread3 4 If the reading is higher replace the front hand grip 6...

Страница 23: ...s in the plate as shown in fig 15 Tighten the bolts to 5 Nm 8 Refit the components from point 1 Replacing the heating element in the rear hand grip tank unit 1 Disconnect the two cable clips beside th...

Страница 24: ...oller bearing D and chain drive wheel E See fig 2 4 Removethesparkplug insertthepistonstoptool andunscrewtheclutchhubwiththeclutchtool Note lefthandthread Turninthedirectionofthearrow as shown in fig...

Страница 25: ...on surface and bearing surface are undamaged During reassembly of the centrifugal clutch the chain brake should be in the off position Reassembly NOTE The clutch springs should not be opened out more...

Страница 26: ...an the oil tank 2 Remove the following components Chain and guide bar Centrifugal clutch Chain brake 3 Unscrew the drive wheel See fig 1 4 Use a screwdriver and lift the oil pipe forward at A Lift up...

Страница 27: ...fugal clutch Chain and guide bar 10 Adjust the pump feed rate as described below 11 Refill with chain oil and check lubrication Clean all components including the pump and oil pipe mounts in the crank...

Страница 28: ...of fuel for the given engine speed and power demand is metered In the mixing venturi B the choke throttle butterfly valve and diffuser jets are located Air is mixed with the fuel to give a fuel air mi...

Страница 29: ...fuel is sucked more easily from the diffuser jets E F and G The throttle butterfly H is partially open In idling mode fig 5 the throttle butterfly H is closed Air is sucked through an aperture in the...

Страница 30: ...ndbolt can be pushed out using a welding rod or similar 6 Loosentheairfilterholderandliftoffthecarburettor Leave the filter holder in the carburettor space 7 Removethetopcover E ofthemeteringunitand R...

Страница 31: ...or body and check that they are not blocked See figs 11 and 12 and check the following 1 The gaskets pump diaphragm and metering diaphragm are undamaged WARNING When using compressed air the air jet s...

Страница 32: ...hehighandlowspeedjetscrewsandsprings Note Never tighten down the screws This can damage the seats and needle tips 3 Positionthefuelfilter L withthehelpofthehandle of a small screwdriver See fig 13 4 F...

Страница 33: ...er of water 4 Pump up the pressure to 50 kPa 0 5 bar and clamp the pump tube 5 There should be no leakage If leakage occurs refer to the table below Leakage at Fault with Diffuser jets Needle valve Le...

Страница 34: ...be exceeded Adjusting the carburettor involves adjusting the motor to the local conditions e g climate altitude fuel and type of 2 stroke oil The carburettor is equipped with three adjustment options...

Страница 35: ...and 2 once again 4 Turn the L screw counterclockwise 0 75 of a turn 5 Adjust the T screw until the idling speed is 2 700 rpm Adjustment of the H needle 1 Adjust the H screw until the maximum engine sp...

Страница 36: ...locking sleeve on the L screw using the special screw driver with splines 4 While keep pressing the screwdriver find the high estidling speed by slowly turning the L screw clock wise and counter cloc...

Страница 37: ...tor screwdriver 2 Press in the locking sleeve on the H screw using the special screw driver with splines 3 While keep pressing the screwdriver adjust the H screw until the maximum engine speed at full...

Страница 38: ...de See fig 2 7 Remove the bolt F from the flywheel side See fig 3 8 Lift the motor unit slightly and using pliers push off the cable clips from their respective switches If the saw is equipped with ha...

Страница 39: ...f the throttle lock has been removed it should be refitted before the tank unit and motor unit are reassembled See page 15 5 Liftthemotorunitoverthetankunitandpushthe fuellineandthrottlecableintotheir...

Страница 40: ...m WARNING The fuel that is used in the chainsaw poses the following hazards 1 The fluid and its fumes are poisonous 2 Can cause skin irritation 3 Is highly inflammable 1 Remove the following component...

Страница 41: ...diately with paper or clean rag 7 Remove one of the piston circlips press out the gudgeon pin and remove the piston See fig 2 8 Remove the needle roller bearing from the connecting rod little end 9 Un...

Страница 42: ...he inlet manifold is undamaged 8 Pressure test the decompression valve as follows See also fig 5 A Connect tool 531 03 06 23 to the decompression valve B Pump up the pressure to 80 kPa 0 8 bar C Wait...

Страница 43: ...hepistonringeitherbyhandorusingthe pistonringtool5025070 01 Seefig 10 Carefully fit the cylinder 7 Fitthefourcylinderbolts C andtightenthemin rotation Finally tighten them to 10 Nm See fig 11 8 Refit...

Страница 44: ...09 56 01 and 502 71 39 01 to the inlet manifold and exhaust port See figs 12 and 13 2 Connect tool 531 03 06 23 C to the impulse channel B on the inlet manifold See fig 13 The decompression valve sho...

Страница 45: ...als Guidebarbolts describesonlyreplacementofthe guide bar bolts 2 Remove the carburettor space bottom plate by taking out the four bolts 3 Remove the washer and spacer on the clutch side See fig 1 4 R...

Страница 46: ...10 If necessary remove the following components A Chain tension screw B Guide bar bolts C Bark gripper Cleaning and inspection NOTE Ensure that no dirt or foreign particles enter the bearings if they...

Страница 47: ...s enter the bearings D Refit the rubber stop A See fig 9 E Refit the oil filler cap 2 If replacement crankcase seals are to be fitted greasethesealsurfacesandtapthemhomeusing tools 502 52 20 01 and 50...

Страница 48: ...ess gasket material does not fall into the crankcase 9 Refit the following components A Tank unit B Piston and cylinder C Silencer D Carburettor E Lubrication system F Centrifugal clutch G Electrical...

Страница 49: ...rator if fitted On the clutch side Chain and guide bar Chain guide plate Centrifugal clutch Oilpump Guide bar bolts 1 Drain out the chain oil 2 Knockthroughtheoldguidebarboltsothatitfalls into the oil...

Страница 50: ...throttle valve pivot Loose throttle valve screw Worn throttle valve Needle valve assembly sticking Leak in metering system air or fuel Metering system centre knob is worn Hole in diaphragm Leaking con...

Страница 51: ...e Pressure testing the carburettor Pressure testing the decompression valve Pressure testing the cylinder High rpm Adjust H screw Blocked air filter Blocked fuel tank vent Blocked fuel filter Fuel lin...

Страница 52: ...www redmax com 115 96 38 26 3 4 2019...

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