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Workshop Manual, 2100, 1990-11, Chain Saw

1. Drill with care in order not to damage the carburettor housing Fig 4 2 Remove the metering diaphragm cover and the me tering diaphragm Note that the centre pin of the diaphragm enters the forked end of the lever of the needle valve Connect the pressure gauge 50 25 038 01 to the fuel inlet of the carburettor and pump until a pressure of 0 03 MPa 0 3 kp cm is reached Check for any leakage at the needle valve or at the gasket on the pump side The easiest way of locating leakages is to pour some petrol where you suspect the leakages to be Fig 4 5 Loosen the screw that retains the bearing shaft of Unscrew the two adjusting needles Remove the the lever and remove lever shaft spring and needle cover above the pump diaphragm and remove valve see fig 4 3 diaphragm and gasket Lift off the fuel screen care fully by means of a pointed tool 4 1 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Fuel system GP Speed governor The purpose of the governor is to limit the engine speed in order to protect vital parts like the crank shaft and ignition system from excessive stresses We therefore advise most strongly against any inter ference designed to render it inoperative When the saw is run under no load conditions the engine speed is limited to 10 500 r min as the gover nor comes into operation Fig 46 1 Steel ball 2 Spring 3 Fuel inlet 4 Fuel outlet T
2. www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Safety Equipment TI A Chain brake Removal Proceed as follows Remove the clutch cover and clean brake mecha nism and brake band Fix the clutch cover in the clamping device No 50 25 102 01 with two spare guide bar studs and nuts Fig 11 3 Dismantle the brake band as follows Use a drift 1 mm to push out from below the roll pin that retains the brake band in the correct position The band with pull rod and spring may then be changed Fo Fig 11 1 Push the brake band upwards e g by inserting a combination key between the brake band and the two rear supports in order to get at the adjusting nut see fig 11 1 Remove the adjusting nut retaining the pull rod and carefully release the brake mechanism with the hand guard Remove the brake spring KA Fig tt When replacing the hand guard first remove the nut then the pivot pin Fig 11 2 Check the band wear The band should have at least 3 4 of its original thickness 1 mm on its most worn part otherwise it must be changed www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Safety Equipment TI The catch may be removed after pushing out the roll pin functioning as a bearing Use a drift 4 mm Check the wear on the locking part of the catch see A fig 11 5 The catch spring is easily changed if nece
3. 9623 or 606 561 4983 Special Tools 3 206 23 72 11 7002 01 50270 ge 2 282 00 08 01 ps D 502 50 25 01 compl 202 42 94 45 202 43 32 55 202 42 97 55 202 43 33 55 50 27 005 01 50 25 006 01 Assembling pliers spark plug protector 50 25 007 01 Assembling pliers cable grommet 50 25 018 01 NV 4mm 50 25 019 01 NV 3 mm 50 25 057 01 NV 3 16 Allen key 50 25 020 07 M5 Stud fitting tool 50 25 022 01 NV 8 mm 50 25 023 01 NV 10 mm Socket spanner 50 25 024 01 Spanner clutch centre 50 25 025 01 Hoiding bar compl 50 25 026 01 Puller compl with screw www mymowerparts com 50 25 030 01 Fitting tool compl for crankshaft 50 25 033 01 Piston stop 50 25 036 01 Revolution counter 50 25 037 01 Vacuum gauge compl 50 25 038 01 Pressure gauge compl 50 25 042 01 Lithium grease 250 g 0 55 Ib 50 25 045 01 Distance sleeve 35 mm 50 25 047 01 Cover plate inlet port 3 1 For Husqvarna Parts Call 606 678 9623 or 606 561 4983 50 25 049 01 Assembling pliers centrifugal clutch 50 25 050 01 Repair kit for elec tric cables 50 25 051 01 Cable clip pliers 50 25 052 01 Fitting sleeve for sealing ring 50 25 062 01 Fitting tool manual pump 50 25 066 01 NV 22 mm U spanner for vibration damper 50 25 069 01 Fitting drift piston pin 3 2 fo 50 25 070 01 Special Tools B 3 50 25 070 01 Piston mounting se
4. Cylinder Piston Fer g EE EN ae Removal Lift off the cylinder cover and remove the throttle push rod Remove the plastic sleeve from the car burettor adjusting needles Loosen the screws re taining the carburettor but leave the carburettor in its seating Remove the spark plug protector and the spark plug from the cylinder Remove the silencer and loosen the four screws retaining the cylinder with Allen key No 50 25 057 01 Fig 7 2 Put a rag into the crankcase opening to protect the crankcase from the ingress of dirt etc Remove the circlips on the wristpin with a pair of flat hose pliers and push out the wristpin with fitting drift No 50 25 069 01 Remove the insulating piece from the cylinder Scrape off carbon deposits from the exhaust port and combustion chamber Fig 7 1 Lift the cylinder To facilitate removal the piston should be at the bottom dead centre Control Check the following before assembly and take the measures required DAMAGE REMEDY Broken cooling fins damaged threads n case of severe damage change the cylinder Restare the thread with Hefi Coil inserts Seizure marks in the cylinder wall especially Polish the marks with a fine emery clotch to remove aluminium at exhaust port deposits IF the marks are deep change cylinder and piston Surface of the cylinder wail worn esp at the top Replace cylinder an
5. Remove the throttle lever shaft and the lever with a drift 3 mm www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Safety Equipment fl Fig 11 9 The safety catch is removed by pushing out the roll pin with a drift 3 mm The spring is attached to the safety catch It may be changed after pushing out the roll pin with drift 1 5 mm Reassembly of the throttle safety catch and the throttle lever is made in reverse order to dis mantling Check that the throttle lever works properly both as safety catch and as starting throttle ratchet 11 3 www mymowerparts com
6. runs Replace if necessary 4 Check the oil hoses and their connections to Fig 6 2 tank and crankcase fig 6 5 Check if there is dirt in the suction channel by ro tating the pump shaft in both directions When the pump works properly and is filled with oil the oil goes alternately through the suction channel A and the pressure channel B Fig 6 5 6 1 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Lubricating system Assembly Manual oil pump Assembly of the oil pump is made in reverse order Figure 6 8 shows the oil passage from the oil tank to dismantling through the manual oil pump to the guide bar A Oil passage from the oil tank into the pump Fig 66 Note the following 1 Check that the sealing for the pressure and suction channel is fitted clean and undamaged C fig 6 3 Check also the O ring of the pump housing D fig 6 3 Removal of pump piston Loosen the pump piston with tool No 50 25 062 01 Then pull pump piston and pump cylinder out of the oil tank Fig 6 7 Use sleeve No 50 25 052 01 to protect the main bearing seal when the pump is fitted into the crankcase 2 After fitting the pump into the crankcase check that the pump piston turns easily Fig 6 9 6 2 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Lubricating system Removal of valve housing Loosen t
7. tool No 50 25 030 01 Leave the crankcase half in the clamping device to cool down Fig 8 11 Grease the gasket seat and fit a new gasket on the magneto side of the crankcase Locate the magneto side with crankshaft over the drive side ensuring that the gasket is not displaced Turn around the crankcase in the clamping device Check that the guide pins enter correctly Fig 8 12 Pull the crankcase halves together with fitting tool No 50 25 030 01 Tighten all screws beginning nearest the crank shaft see fig 8 4 Check the position of the gasket and cut off its edges on the cylinder base surface Fig 8 13 Check that the crankshaft rotates easily If not knock lightly with a plastic hammer on the drive side of the crankshaft Check that the crankshaft is properly centered in the crankcase 8 3 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Crankcase Crankshaft 33 Fig 8 14 Fit a new main bearing seal in the magneto side of the crankcase Use fitting drift No 50 25 082 01 Fit the oil pump see chapter 6 Fit piston and cylinder see chapter 7 Pressure test the crankcase see chapter 2 Changing the vibration dampers Fig 8 15 Check the vibration dampers before reassembling the tank unit and the crankcase If they are limp or damaged they should be changed Use U spanner No 50 25 066 01 Make
8. Fig 8 2 If no spark occurs try a new plug If still no spark check the connection between ignition cable and spark plug protector 2 Disconnect the short circuiting cable from the Fig 54 switch Remove starter and air conductor Remove cylinder Check for a spark cover and spark plug and fit piston stop No If a spark occurs the stop switch is faulty and 50 25 033 01 in the spark plug hole Then loosen should be exchanged the flywheel nut by means of a box spanner 17 mm 3 Remove the starter and air conductor Cables that are squeezed or otherwise damaged should be exchanged 5 1 www mymowerparts com Fig 5 5 Fit holding bar No 50 25 060 01 on the flywheel and puller No 50 25 026 01 on the holding bar Remove the flywheel Fig 56 Remove the three screws retaining the armature plate Remove the bracket for the ignition cable and disconnect the short circuiting cable from the stop switch Then remove the armature plate Assembly is made in reverse order When fitting the armature plate notice the marking fig 5 7 ensuring a correct advance ignition The flywhee nut should be thightened by torque 40 43 Nm NOTE Before fitting a new flywheel remove every trace of rust preventive especially on the hub 5 2 For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Electric system 55 Fig 5 7 Changing the starter pawls and springs Place the flywheel on the working bench with the starte
9. For Husqvarna Parts Call 606 678 9623 or 606 561 4983 D Husqvarna Workshop manual chain saw model 101 88 01 26 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Ss EE e Contents Technical Specification Service Data Special Tools Fuel system Carburettor Electric system Lubricating system Oil pump Cylinder Piston Crankcase Crankshaft Starter Centrifugal Clutch Safety Equipment www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Displacement Bore Stroke Ignition system Ignition advance Spark plug Electrode gap Carburettor Fuel tank volume Oil tank volume Chain lubrication Clutch drum sprocket Weights Technical Specification 99 cm 6 cu in 56 0 mm 2 207 40 0 mm 1 57 Electronic Make SEM type GA 1 249 before t d c at 133 r s 8 000 r min Bosch WSR 8F 0 5 mm 0 020 Diaphragm carburettor Make Tillotson type HS 136C with speed governor 0 070 Basic setting 1 0 L 1 2 1 0 litre 0 26 US gallon 0 22 Imp gallon Fuel mixture 4 1 25 With Husqvarna Twostroke Oil 2 1 50 0 65 litres 0 17 US gallon 0 14 Imp gallon Two separate lubrication systems Automatic No supply during idling Adjustable for two different delivery rates Bar 15 21 Position I Bar 21 and more Position II Manual Hand operated pump on the left side of the rear handle
10. Standard 7 teeth 0 404 Pitch Optional 8 teeth 3 8 Pitch 1 Weight sawbody empty 8 0 kg 17 6 Ib 2 Weight sawbody empty incl 24 bar and chain Oregon 52L 76E 0 404 10 2 kg 22 5 Ib 3 Same as 2 however with full tanks 11 4 kg 25 1 Ib www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Technical Specification i Classification table Cylinder class Piston class A A B B C C PLEASE NOTE As A denotes smallest cylinder diameter and C the largest piston grades should be matched or one grade smaller E g it is not permissable to use a grade B piston in a grade A cylinder 1 2 Fig 1 1 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Service Data p Crankcase Assy Vacuum 0 04 MPa 0 4 kp cm 5 7 psi Max leakage 0 01 MPa 1 min 0 1 kp cm 1 4 psi per min Tools 50 25 037 01 Vacuum gauge 50 25 081 01 Cover plate exhaust port 50 25 047 01 Cover plate inlet port Pressure 0 08 MPa 0 8 kp cm 11 4 psi Max leakage 0 02 MPa 30 sec 0 2 kp cm 2 8 psi per 30 sec Tools 50 25 038 01 Pressure gauge 50 25 081 01 Cover plate exhaust port 50 25 047 01 Cover plate inlet port Fig 2 2 Fuel tank Pressure 0 05 MPa 0 5 kp cm 7 1 psi Leakage No leakage permitted Tool 50 25 038 01 Pressure gauge Fig 2 3 Carburettor Pressure 0 03 MPa 0 3 kp c
11. ary 4 6 www mymowerparts com Fuel system 8 Q gt 3 Sr D E g ER a e E KE 5 ig KL Si 2 g Kai OO KE Vis Ai E a E d 2 lw 8 v c a gt jo ales ELG ale kel o T MIS oF gt gt Ze a E Ka p Elas 5 wt n o Ve Q as oa o EN v GE 5 BSF 513 Ze c 9E mm gt 28 p 2 2 5 es es 5 Ziel ER 3 T E BO alo e 3 LY R D w Q O Sloe i UE elz S lee E E a ei le Q x Lo ke gt wll zionlklz lulde For Husqvarna Parts Call 606 678 9623 or 606 561 4983 4 7 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Electric system 5 Ignition system trouble shooting In all ignition testing the plug must be firmly earthed against the cylinder in order to prevent da mage to the system 1 Remove the spark plug Connect the ignition cable and earth the plug e g against the cylinder Check for a spark between the electrodes when d 7 Fig 5 3 4 In case the trouble has not been detected check the armature plate by means of testing device No 50 25 124 01 Remove the armature plate see below Removal assembly and test it under load For test values see the instruction supplied with the testing device Fig 5 1 you rotate the engine by means of the starting handle The stop switch should be in position 1 B Removal assembly
12. case to the tank unit Fig 8 5 Warm up the bearing seats carefully with a gas burner to abt 130 C Warming up should be applied evenly to avoid thermal stress Avoid to heat the ball bearings direct with the flame 8 1 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Crankcase Crankshaft e Fig 8 6 Separate the crankcase halves by careful use of a plastic hammer Remove the sealing ring on the magneto side Remove the ball bearings from the crankshaft with a speciai ball bearing puller Crankshaft check Fig 8 7 A defective crankshaft must be replaced Check the big end of the connecting rod Should there be seizure marks or discoloured spots on the sides the crankshaft must be changed The connect ing rod should not show any radial play up and down 8 2 Assembling the crankcase Fig 8 8 Fit a new ball bearing on the magneto side of the crankshaft Use fitting drift No 50 25 082 01 A Ea eege Fig 8 9 Warm up the bearing seat in the magneto half of the crankcase to abt 130 C Fit the crankshaft with ball bearing in the crankcase half www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Crankcase Crankshaft 5 3 Fig 8 10 Place the drive side in the clamping device No 50 25 102 01 Warm up the bearing seat to abt 130 C Fit the ball bearing in the seat and locate it properly with fitting
13. d piston Seizure marks on the piston Polish the marks carefully with a fine file or emery cloth Before fitting the piston polish the cylinder wall as stated above If the marks are deep change the piston and if necessary the cylinder Piston rings stuck in the grooves Remove the piston rings carefully and clean the groaves completely before reassembly Check the wear of the piston rings by placing them in the bottom of the cylinder The gap between the ends of the rings should be 0 6 mm max Check that the rings are still springy 7 1 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Cylinder Piston Assembly Check that piston and cylinder have the same classification marking see fig 1 1 and the classi fication table Fit the insulating piece and the sealing collar on the cylinder Check that the gasket is fitted correctly Fig 7 3 Place a new cylinder base gasket on the crankcase Check that the needle bearing of the wristpin is not damaged Fit it in the connecting rod and lubri cate with a few drops of two stroke oil Fig 7 4 Fit the piston on the connecting rod Use fitting drift No 50 25 069 01 to centre the piston against the needle bearing of the connecting rod Push the wristpin in and fit the circlips Turn them round with a pair of flat hose pliers to check that they run smoothly in the grooves 7 2 Fig 7 5 Lubrica
14. fourstroking for 10 20 sec when cutting into a log indicates not only a good high speed function of the carburettor but also a good condition overall www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Fuel system 8 The following problems may occur when warming the chain saw up PROBLEM DAMAGE Engine fourstroking Speed governor faulty Badidling SSCS GCrackinthe insulating piece Badly tightened carburettor screws Incorrectly assembled or leaking gaskets Tank breather valve inoperative Fuel filter clogged Low engine power Cs Leakagein the pumping section of the carburettor NOTE Too fean adjustment of the carburettor would cause a considerable loss of power Adjust the carburettor in order to obtain maximum power and not maximum speed B Adjustment of L needie Adjust the idling speed by means of the throttle 3 Adjust the L needle to the highest speed posi adjusting screw T fig 4 16 Try to reach a tion Then open it equivalent to 10 min ona position where the chain is just beginning to clock face to obtain a somewhat richer supply rotate that is at a comparatively high idling speed to aid acceleration 4 By means of the T needle adjust the idling speed to 2 300 2 500 r min ensuring that the chain does not rotate when engine is idling Give full throttle a couple of times to check that the engine responds If not open the L needle by abt 3 mi
15. he socket head screws that retain the valve housing with Allen key No 50 25 019 01 Fig 6 10 A Valves B Suction hose C Valve housing D Valve guidance Remove the valve housing C fig 6 10 from the oil tank Pull the suction hose B fig 6 10 and the oil filter out of the oil tank Clean the parts and replace if damaged Particularly check the O ring and the valves A fig 6 10 Clean the oil channels with compressed air and check simultaneously the hose connection between tank and crankcase behind the silencer Assembly Assembly of the valve housing and the pump piston is made in reverse order to dismantling Note the following 1 The valve guidance D for the suction hose shall be fitted according to fig 6 10 2 Fit the valves according to fig 6 10 3 Lubricate the O rings on the pump cylinder be fore assembly to prevent damages 4 Check that the pump works after assembly Trouble shooting guide A ef k o0 Z NNN KKK S Q amp gt A ENN Ko C ANGNG ARA e o B ENK D Adjusting screw in position II Adjusting screw worn E Dirt in the suction hose and oil filter X z Vacuum in the oil tank Pump piston seized Suction hose cracked or leaking Oil channel of crankcase clogged PETE Driving gear damaged HA Sealing ring damaged or lost 6 3 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100
16. he steel ball and spring in the governor are so de vised that vibrations in the carburettor at a certain engine speed cause the stee bail to open the fuel outlet An excessively rich mixture is then obtained and the engine begins to four stroke the speed drops and the vibrations decrease The steel ball then closes the outlet the engine speed increases and the process is repeated Removal of speed governor Remove the screw for the choke flap Pull out the flap approx 7 mm and push out the choke shaft approx 5 mm Remove the speed governor with a suitable screw driver Fig 4 7 4 2 Carburettor check A Pumping section Clean the fuel screen and lines with compressed air Check the gasket and the pump diaphragm for damage or wear B Metering section Check that the adjusting needles are straight and that their tapered ends are not damaged Check the Fig 4 8 gasket and the metering diaphragm for damage or wear Check with particular care the wear on the centre pin of the diaphragm Fig 4 9 Check that the needle valve is not worn neither on its seat nor in the groove for the lever www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Fuel system og Assembly A Pumping section Locate the fuel screen carefully in its seating see fig 4 5 Locate the pump diaphragm next to the carburettor housing and then add gasket and cover Tighten the screws
17. heck that the bearing is on a level with the drum hub On Oregon rim sprocket drum the bearing can be changed without tools Changing the clutch spring The clutch spring should be changed if it has been overheated blue coloured or broken it is easily changed with pliers No 50 25 049 01 as Fig 10 3 When fitting the new spring check that its ends connect in the centre of a clutch shoe Do not overstretch the spring 10 1 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Centrifugal Clutch We Changing the worm gear Lubrication The worm gear of the oil pump drive is easily Lubricate the worm gear of the oil pump drive removed from the clutch drum It has four dogs with Molykote before fitting the clutch drum The which fit into four corresponding grooves in the needle bearing is to be lubricated with ball bearing clutch drum grease Two pumps with the grease gun into the hole of the shaft centre are sufficient Fig 10 4 When fitting a new gear put it in the clutch drum and check that it fits exactly into the grooves of the drum Then fit the drum with gear on the crankshaft H Do not forget the washer behind the worm gear Fig 10 6 Checking wear Check the wear of the clutch centre and the clutch shoes There should be at least I mm material left on the friction surface of the shoes Fig 10 5 Ali the shoes have to be changed on the same occasion 10 2
18. m 4 3 psi Leakage No leakage permitted Tool 50 25 038 01 Pressure gauge 2 1 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Oil pump Pressure 0 3 MPa 3 kp cm 42 7 psi Pump capacity at 6 000 r min Pos 1 approx 16 18 ml min 0 98 1 10 cu in min Pos 2 approx 22 24 ml min 1 34 1 46 cu in min Service Data p Tools 50 25 085 01 Oil pump tester Grad measuring glass Fig 2 5 Starter Make sure that it is possible to turn the pulley at least 1 2 turn further when the cord is pulled out completely Fig 2 6 Fuel and oil The twostroke engine is lubricated by oil mixed with petrol in various proportions depending on the type of oil used Pre mixed oil 1 20 5 oil Ordinary twostroke oil 1 25 4 oil Husqvarna Twostroke Oil 1 50 2 oil See also the mixing table below Fig 2 7 Mixing table Litres Pints Litres Petrol in Petrol in Litres Petrol in Petrol in Litres Petrol in Petrol in of oil of ail of petrol Impgallon US gallon of petrol Imp gallon US gallon of petrol Imp gallon US gallon 2 2 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Service Data cb Torque Nm ft Ib Lubrication NE ot 16 18 bi 3 7 5 2 7 4 14 8 Ges RW A Twostroke oil Molykote Locking lacquer K Es 14 8 18 4 www mymowerparts com For Husqvarna Parts Call 606 678
19. n Check again eee Ze Si SS ol C Adjustment of H needle Adjust the high speed needle H as follows Apply full throttle by keeping a constant grasp of the throttle trigger At correct adjustment of the H needle the engine should be fourstroking The high idle speed should be approx 10 500 r min Fig 4 17 Put your right hand on the front handle and make a fine adjustment of the L needle with your left hand Use screwdriver No 50 16 002 01 Fine adjustment is made as follows 1 Screw in the L needle slowly and the speed will increase Screw in the needle a little further and the speed will slow down again as the fuel supply becomes too lean Notice the position of the needle at the highest speed 2 Open the L needle again and notice the highest speed position Note that the speed slows down at richer supply g Fig 4 18 4 5 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 100 Fuel system T Fig 4 19 Fig 4 20 Screw in the H needle slowly until acceleration Check by means of e g revolution counter No becomes slower position A 50 25 036 01 that the high idle speed is approx Then screw the needle out equivalent to 10 min 10 500 r min Should the high idle speed of the on a clock face engine be below 10 000 r min check the speed governor of the carburettor and replace it if neces s
20. of the cover diagonally and evenly Fig 4 10 i Check that the needle valve lever is not worn neither at the connection to the valve nor to the metering diaphragm Check that the filter screen near the main jet is E not dirty or damaged Ms et 7 G Mixing section Laan Clean all fuel lines and jets with compressed air Se D Speed governor Fig 4 12 The speed governor is easily checked by means of the pressure gauge No 50 25 038 01 P gaug B Metering section Fit new welch plugs Install them with a suitable drift for the big plug drift 8 mm for the small plug drift 4 mm NOTE Do nat press in the plugs so that they bulge inwards Fig 4 11 Connect the pressure gauge as shown in fig 4 11 Check that the hose does not cover the two holes near the thread The valve should be tight which means no hiss sound at a pressure below 0 10 MPa 1 kp cm In case of leakage the valve should be replaced Fig 4 13 The carburettor spare part kit has got No Mount the needle valve fever spring and shaft 50 15 467 01 Locate the spring properly 4 3 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Fuel system S When properly adjusted the lever of the needle valve shall be on level with the carburettor housing surrounding it Adjust if necessary see fig 4 14 Fig 4 14 If the lever is located too high the carburettor will be very sensiti
21. r pawls downwards Fig 5 8 Push the bearing pins of the starter pawls out of the flywheel with a drift 3 mm Change starter pawls and springs and press back the bear ing pins from the fan side Use Loctite AA in the pin holes before putting the pins back Check that the pins reach the bottom and that springs and pawls work properly To ensure proper connection between contact spring and ignition cable use assembling pliers No 50 25 006 01 for fitting the spark plug protec tor on the ignition cable We recommend the use of Lithium grease No 50 25 042 01 when connecting the ignition cable to the spark plug protector www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Lubricating system Removal of oil pump Remove the following parts in order to get at the oil pump Clutch cover chain and bar centrifugal clutch NOTE Left hand threads clutch drum NOTE The washer between the oil pump drive gear and the main bearing seal Fig 6 3 For cleaning dismantle the pump as follows 1 Remove the adjusting screw A fig 6 3 2 Knock the edge of the pump housing against a piece of wood to make the pump piston B fig 6 3 and its bearing slide out of the casing Fig 6 1 Loosen the three screws that retain the pump with a screwdriver and remove the oil pump Fig 6 4 3 Check the wear of the adjusting screw against which the cam curve of the pump piston
22. ssary Adjustment of brake band Make an initial adjustment utilising a spare clutch drum in the brake band Fig 11 6 It should not be possible to rotate the drum when the brake is released but in the unbraked position the drum should be easily rotated Fine adjustment is made with the clutch cover fitted on the saw The gap between the catch and the head of the adjusting nut should be 7 mm when the brake is released Measure the gap with a calli per see fig 11 7 Note that in the unbraked position the brake band must not touch the clutch drum Release and lock the brake repeatedly to check that the mechanism works smoothly To check that the chain brake actuates correctly proceed as follows Fit guide bar and chain Start the engine and let it idle Release the chain brake with the hand guard Operate the throttle trigger With a properly adjusted brake band the chain must not rotate as the engine accelerates Adjustment of the Swed O Matic Set the adjusting screw A fig 11 7 so that the brake actuates at a load of 20 24 kp on the guide bar nose 24 guide bar Check this e g by pushing the guide bar nose against a spring balance The Swed o Matic should be adjusted so that it actuates too easily rather than not at all B Changing the throttle safety catch and the throttle lever Dismantle the tank unit as described in chapter 8 under the heading Removal of crankcase Fig 11 8
23. sure that the tool also turns the rear steel washer of the damper 8 4 Assembly of crankcase tank unit Fit the rear part of the tank unit first so that the fuel hose may be pulled through the hole in the crankcase Fig 8 16 Adjust the front part of the tank unit and fit the vibration dampers www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Removal Remove the screws that retain the starter Set the return spring to zero by pulling out the starting cord by abt 30 cm Fig 9 1 put it into the groove of the pulley rim and let the pulley turn slowly backwards slow it down with your thumb Loosen the screw and remove the washer in the centre of the pulley Fig 9 2 Lift off the pulley Remove the screws that retain the plastic cover over the return spring Remove the cover and the spring NOTE It should be possible to turn the pulley a further 1 2 of a turn approx with the cord pulled out entirely Starter Eed Assembly Put the return spring new one if necessary into the starter housing Lubricate the centre tap with a few drops of ordinary engine oil Put the plastic cover back and tighten the screws Fig 9 3 If necessary change the starting cord and fit it on the pulley Make sure that the stop cube fits properly in the recess in the pulley and that the screw in the cube has its head facing the pulley the end of the screw points ou
24. t compl 50 25 081 01 Cover plate exhaust port 50 25 082 01 Fitting drift sealing ring 50 25 083 01 Hook for oil filter 50 25 084 01 Ejectrotester 50 25 085 01 Oil pump tester compl 50 25 086 01 NV 3 mm 50 25 087 01 NV 4 mm Allen screwdriver with ball www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Special Tools 3 50 25 090 01 Jet Pac spray gun compl incl retouch paint 50 25 091 01 Retouch paint orange 1 8 50 25 092 01 Pressure pack for Jet Pac 50 25 101 01 Extractor sealing ring 50 25 102 01 Clamping device 50 25 106 01 Glue adhesive 50 25 107 01 Glue epoxy 50 25 108 01 Loctite AA normal locking power 50 25 109 01 Loctite AAV strong locking power 50 25 124 01 SEM electric system tester 3 3 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Fuel system CR Removal of carburettor Remove carburettor cover pre filter air filter cylinder cover and fuel hose Remove the throttle push rod from the plastic le ver with a pair of flat hose pliers Fig 4 3 Drill a smal hole in the welch plugs approx 2 mm and prise away the plugs by means of a pointed tool Fig 4 1 Loosen the socket head screws that retain the carbu rettor use the Alien key No 50 25 018 01 Remove screws air filter elbow and carburettor Clean the carburettor on the outside Fig 4 4 NOTE
25. te the piston rings with a few drops of two stroke oil Place the supporting piece in mounting set No 50 25 070 01 under the piston Fig 7 6 Use the piston ring compressor in mounting set No 50 25 070 01 and push the cylinder care fully down over the piston To avoid breaking the piston rings do not turn the cylinder Tighten the four cylinder base screws diagonally and evenly Turn the crankshaft and check that the piston moves easily in the cylinder Fit the silencer and the carburettor Connect the throttle push rod to the carburettor and fit the plastic sleeve over the adjusting needles www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 2100 Crankcase Crankshaft 33 Removal of crankcase The following components will have been removed already chain and bar centrifugal clutch ignition system carburettor silencer cylinder and piston Fig 8 3 Separate the tank unit from the crankcase Remove the cylinder base gasket Fig 8 1 Drain the oil and fuel tanks Place the chain saw in the clamping device No 50 25 102 01 and remove oil pump and tank unit Do not forget to disconnect the oil hoses between crankcase and oil tank Fig 8 4 Remove the seven screws holding the crankcase halves together Do not forget the screw behind the plastic cover on the rear part of the crankcase Fig 8 2 Remove the six screws three on each side that connect the crank
26. twards Wind up the cord abt 3 turns on the pulley Note right direction and fit it in the starter housing Check that the spring grips the pulley then fit the washer and the screw Make sure that the pulley can move freely Fig 9 4 Pull the cord through the cord sleeve of the starter housing and through the starter handle Make a knot in the cord and pull the knot completely into the insert and handle Put the cord into the groove of the pulley rim and tension the spring enough to get 1 2 spare round Fit the starter 9 1 www mymowerparts com For Husqvarna Parts Call 606 678 9623 or 606 561 4983 Centrifugal Clutch JG Removal Fit the piston stop No 50 25 033 01 into the spark plug hole Remove the clutch centre with tool No 50 25 024 01 or combination wrench NOTE Left hand threads Lift off clutch centre and clutch drum Do not lose the washer behind the worm gear if the gear follows the drum Fig 10 1 Changing the needle bearing Lift off the worm gear of the oil pump drive if necessary and place the clutch drum with the chain drive upwards on a tube sleeve e g No 50 25 030 04 as close to the bearing as possible Fig 10 2 Push out the bearing with a suitable drift The drift is to be centered by the inner diameter of the bearing e g use a rejected shaft Use the drift to press a new bearing into the clutch drum NOTE Press on the side of the bearing where the type number is C
27. ve as regards the adjustment of the adjusting needles too low lever induces bad acceleration qualities Check that the lever can move freely Make a pressure test of the carburettor Proceed as mentioned above Then mount gasket metering diaphragm and cover NOTE Care should be taken to ensure that the centre pin of the diaphragm enters the fork in the lever Install the adjusting needles and screw them out to the following basic position H 1 0 turn open L 1 2 turn open G Speed governor Locate the sealing washer in the carburettor hous ing and fasten the speed governor Push the choke shaft into its position and fit the choke flap and its locking screw 4 4 Adjustment of carburettor A Basic setting Before adjusting the carburettor proceed as follows Clean the air filter or if necessary replace it Check the spark plug and its electrodes Check that the fuel filter is not clogged Fig 4 15 Examine the fuel filter as follows Loosen the fuel hose from the carburettor and lay the chain saw on the clutch side Open the tank cap If there is enough fuel in the tank some of it ought to run out of the hose see fig 4 15 Fig 4 16 After the abovementioned checks make a basic adjustment of the carburettor needles i e H 1 0 turn open and L 1 2 turn open Start the chain saw and warm it up by applying full throttle and letting it cut into a log A constant speed without

Workshop Manual, 2100, 1990-11, Chain Saw

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