Husqvarna 966451906 manual Function

Page 35

Repair Instructions

Function

The carburettor operates differently in the following modes:

Cold start mode

Idling mode

Part throttle mode

Full throttle mode

In cold start mode the choke valve H is completely shut. This increases the vacuum in the carburettor and fuel is easier to suck from all the diffuser jets D, E, and F. The throttle valve I is partly open. The throttle valve, J, is closed. See figure 30.

In idling mode, the throttle valves I and J are closed and the choke valve H is open.

Air is sucked in through an aperture in the throttle valve and a small amount of fuel is supplied through the diffuser jet D. See figure 31.

Fig 30

Fig 31

In part throttle mode, the throttle valve I is partly open and the choke valve H is fully open. Fuel is supplied through the diffuser jets D and E. The throttle valve, J, starts to open. See figure 32.

In the full throttle mode both valves are open and fuel is supplied through all four diffuser jets (D, E, F and G). The throttle valve, J, is fully open. See figure 32.

Fig 32

Fig 33

English - 35

Image 35
Contents 562XP/XPG Page Contents Index Vibration damping system Contents Introduction and safety regulationsIntroduction and safety instructions Special Instructions General InstructionsSymbols in the Workshop Manual Symbols on the sawTechnical data NGK CMR6H 12b Service tools12a 13d 13a 13b 13c Key Service dataEnglish Contents Safety equipmentAlt Cleaning and inspectionDismantling the chain brake Assembling the chain brake Do not touch the muffler until it has cooled. Risk of burns Dismantling the mufflerAssembling the muffler Functional inspectionDismantling the start/stop control Replacing the chain catcherResistance test stop function Assembling the start/stop controlCleaning and inspection Safety equipment Repair instructions Dismantling the starter Cleaning and inspection Clean the parts and checkWear protective glasses Replacing a broken or worn starter cordTensioning the return spring Replacing a broken return spring Starter assemblyDismantling the ignition module and flywheel Assembling the ignition module and flywheel Min 60 mm Dismantling the centrifugal clutchDismantling the oil pump and screen Assembly of centrifugal clutchDismantling the intake system Assembling the oil pump and screenAssembling the intake system Design CarburettorFunction Dismantling the carburettor English Assembly Cleaning and inspection Clean all units in clean petrolEnglish Fitting on the saw Pressure testing the carburettorMake sure that the following components are correctly fitted Opening pressure inwards Tank unitVenting the fuel tank Test Opening pressure outwardsVibration damping system Dismantle Replacing the fuel filterReplacing the fuel hose/return hose Replacing the fuel pump PurgeDismantling the piston and cylinder English Piston ring breakage Faults and causes Score marks on the piston aAssembling the piston and cylinder Carbon build-up BLoosen Pressure testing the cylinderDismantling the crankshaft and crankcase Page Repair Instructions Sealing rings Assembling a complete crankshaft Replacing a bar bolt with intact crankcase Repairing damaged threadsReplacing the bar bolt English Troubleshooting Idling low speed TroubleshootingStarting Acceleration and retardation Troubleshooting methodsHigh speed 2011W31 115 26