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Husqvarna 2100 Workshop Manual
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Husqvarna 2100 Workshop Manual

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Summary of Contents for Husqvarna 2100

  • Page 2 Technical Specification Service Data Special Tools Fuel system, Carburettor Electric system Lubricating system, Oil pump Cylinder, Piston Crankcase, Crankshaft Starter Centrifugal Clutch Safety Equipment...
  • Page 3 H= 1.0 L= 1.2 Fuel tank volume 1.0 litre (0.26US gallon, 0.22 imp gallon) Fuel mixture 4%(1:25) With Husqvarna Twostroke Oil 2% (1:50). Oil tank volume 0.65 litres (0.17 US gallon, 0.14 Imp gallon). Chain lubrication Two separate lubrication systems Automatic No supply during idling.

  • Page 4: Classification Table

    Classification table Cylinder class Piston class PLEASE NOTE! As ''A " denotes smallest cylinder diameter and ''C" the largest, piston grades should be matched or one grade smaller E g / t is no t permissable to use a grade B piston m a grade A cylinder.
  • Page 5 Crankcase Assy Vacuum: 0.04 MPa (0.4 kp/cm2, 5.7 psi) Max. leakage: 0.01 MPa/1 mm (0.1 kp/cm 1.4 psi, per min) Tools: 502 50 37-01 Vacum gauge 502 50 81-01 Cover plate, exhaust port 502 50 47-01 Cover plate, inlet port Pressure: 0.08 MPa (0.8 kp/cm , 11.4 psi) Max.

  • Page 6: Oil Pump

    The twostroke engine 1S lubricated by oil mixed with petrol m 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:...
  • Page 8 502 50 06-01 502 50 30-01 Assembling pilers Fitting tool compl for (spark plug protector) crankshaft 502 50 07-01 502 50 33-01 Assembling pliers Piston stop (cable grommet) 502 50 18-014 NV 4 mm 502 50 19-01V3 NV 3 mm 502 50 57-01 NV 3/16’’...
  • Page 9 502 50 70-01 502 50 49-01 Piston mounting set, Assembling pliers 502 50 70-01 compl, (centrifugal clutch) 502 50 50-01 Repair kit for elec- tric cables 502 50 81-01 Cover plate, exhaust port 502 50 51-01 Cable clip pliers 502 50 82-01 Fitting drift (sealing ring) 502 50 52-01 Fitting sleeve for...
  • Page 10 502 50 90-01 Jet-Pac spray gun compl. incl.. retouch paint 502 50 92-01 502 50 91-01 Retouch paint, orange, 1/8 l 502 50 92-01 502 50 91-01 502 51 01-01 Extractor (sealing ring) 502 51 02-01 Clamping device 502 5106-01 Glue, adhesive 502 51 07-01 Glue, epoxy...
  • Page 11 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. Flg4:3 Dell a small hole in the Welch plugs (approx. ∅ 2 mm) and pose away the plugs by means of a pointed tool.

  • Page 12: Speed Governor

    Speed governor Carburettor check The purpose of the governor is to limit the engine A. Pumping section speed in order to protect vital parts like the crank- Clean the fuel screen and -lines with compressed shaft and ignition system from excessive stresses. We therefore advise most strongly against any inter- air.
  • Page 13 Assembly A. Pumping section Locate the fuel screen carefully m its seating (see fig. 4:5). Locate the pump diaphragm next to the carburettor housing and then add gasket and cover. Tighten the screws of the cover diagonally and evenly. Fig 4:10 Check that the needle valve lever is not worn, neither at the connection to the valve, nor to the metering diaphragm.

  • Page 14: Adjustment Of Carburettor

    When properly adjusted the lever of the needle Adjustment of carburettor valve shall be on a level with the carburettor housing surrounding it. Adjust if necessary (see A. Basic setting Fig. 4:14) 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 .
  • Page 15 The following problems may occur when warming the chain saw up: PROBLEM DAMAGE Engine fourstroking  Speed governor faulty Bad idling  Crack in the insulating piece Badly tightened carburettor screws Incorrectly assembled or leaking gaskets Tank breather valve inoperative Fuel filter clogged Low engine power ...
  • Page 16 Fig 4:19 Screw in the H-needle slowly until acceleration Fig 4:20 becomes slower (position A). Check by means of e.g. revolution counter No. Then screw the needle out equivalent to 10 min 502 50 36-01, that the high idle speed is approx. on a clock-face.
  • Page 18 A. 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.
  • Page 19 Flg 5:7 Fig 5.5 Fit holding bar No. 502 50 60-01 on the flywheel and puller No; 502 50 26-01 on the holding bar Changing the starter pawls and springs Place the flywheel on the working bench with the starter pawls downwards. Fig 5.6 Remove the three screws retaining the armature plate.

  • Page 20: Removal Of Oil Pump

    Removal of oil pump Remove the follow mg 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 of purr, p drive gear and the mom bearing seal! For cleaning, dismantle the pump as follows.
  • Page 21 Assembly Manual oil pump Assembly of the pump is made m 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 6.6 Note the following: 1.
  • Page 22 Removal of valve housing Loosen the socket head screws that retain the valve housing with Allen key No. 502 50 19-01. 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.
  • Page 23 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 retaining 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.
  • Page 24 Assembly Check that piston and cylinder have the same classification marking (see fig. 1:1 and the classification table). Fit the insulating place and the sealing collar on the cylinder. Check that the gasket is fitted correctly. Fig 7:5 Lubricate the piston rings with a few drops of two-stroke oil.
  • Page 25 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.

  • Page 26: Crankshaft Check

    Fly 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 special ball bearing puller. Crankshaft check Fig 8:8 Fit a new ball bearing on the magneto side of the crankshaft.
  • Page 27 Fig 8:12 Pull the crankcase halves together with fitting Fig 8:10 Place the drive side in the clamping device No. tool No. 502 50 30-01 502 51 02-01. Warm up the bearing seat to abt Tighten all screws, beginning nearest the crank- 130°C.
  • Page 28 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 14 Fit a new main bearing seal in the magneto side of the crankcase.
  • Page 29 Removal Assembly Remove the screws that retain the starter. Set the Put the return spring, a new one if necessary, into the starter housing. Lubricate the centre tap with return spring to zero by pulling out the starting a few drops of ordinary engine off cord by bat 30 cm, Put the plastic cover back and tighten the screws.
  • Page 30 Removal Fit the piston stop No. 502 50 33-01 into the spark Use the drift to press a new bearing into the clutch plug hole. Remove the clutch centre with too! No. drum. NOTE I Press on the side of the bearing 502 50 24-01 or combination wrench.
  • Page 31 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.

  • Page 32: Chain Brake

    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 502 51 02-01 with two spare guide bar studs and nuts. Fig 11:3 Dismantle the brake band as follows: Use a drift Ø...
  • Page 33 The catch may be removed after pushing out the Release and lock the brake repeatedly to check roll pin functioning as a bearing. Use a drift Ø 4 mm. that the mechanism works smoothly. To check that the chain brake actuates correctly, Check the wear on the locking part of the catch proceed as follows: (see A, fig.
  • Page 34 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 a ∅ drift 1.5 mm.

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