Page 2 - Workshop Manual; Contents
1 Workshop Manual Brushcutter, Trimmer Model 343R, 345RX, 343F, 345FX, 345FXT Contents General recommendations ___________________ 2 1. Starter __________________________________ 3 2. Electrical system _________________________ 7 3. Fuel system _____________________________ 15 4. Centrifugal clutch ...
Page 3 - General recommendations; Fire risk; Poisonous fumes; Special tools
2 502 51 03-01 General recommendations ! ! ! !! ! Remember: Never start the engine without the clutch and clutch drummounted. Do not grasp hot elements such as the muffler or the clutchbefore they have cooled sufficiently to avoid burn injuries. Avoid getting petrol on you skin or in your mouth. Use...
Page 4 - Starter
3 1 1. Contents Dismantling _________________________________ 4 Assembly __________________________________ 5 Replacing the drive dogs ______________________ 6 Starter
Page 5 - Dismantling
4 1 502 50 18-01 Starter WARNING! Protective glasses should be worn when working on the starter to avoid injury to the eyes if, forsome reason, the return spring should fly out. ! Remove the bolt in the centre of thestarter pulley and remove the starterpulley. Remove the bolt in the centre of thesta...
Page 6 - Assembly
5 1 ! Starter Assembly Clean requisite parts and assemble inthe reverse order as set out for disman-tling. Assembly Clean all components before assembly: Change return springs, starter pulleyand starter cord as needed. NOTE! Be careful when opening the packaging with the return spring so that thespr...
Page 8 - Electrical system
7 2 . 2 Electrical system Contents Checking the ignition spark ____________________ 8 Replacing the spark plug cover ________________ 10 Dismantling ________________________________ 11 Drive dogs _________________________________ 12 Assembly _________________________________ 12 Heated handles ______...
Page 13 - Heated handles
12 2 502 51 34-02 0.3 502 50 18-01 502 50 18-01 Assembly Check the key groove in the crankshaftand key in the flywheel. If damaged thecomponents must be replaced. Attach the ignition module and then theflywheel. Check the air gap, see page 9. Assembly Check that the key groove in thecrankshaft is no...
Page 16 - Fuel system
15 3 3. Contents Air filter ___________________________________ 16 Tank venting _______________________________ 17 Fuel filter __________________________________ 17 Fuel pump _________________________________ 18 Carburettor ________________________________ 18 Assembly _______________________________...
Page 17 - Air filter
16 3 Fuel system In addition to the fuel tank and carburettor, the fuel systemconsists of the air filter, fuel filter and tank venting. All these components interact so that the engine receivesthe optimal mixture of fuel and air to make it as efficient aspossible. Very small deviations in the carbur...
Page 18 - Fuel filter
17 3 531 03 06-23 531 00 60-76 502 50 83-01 Tank venting Check that the tank venting valve workscorrectly. Replace the fuel cap if the valve isfaulty. Tank venting Tank venting takes place through thefuel cap and needs to be functional forthe engine to work. • Remove the fuel hose from the carburett...
Page 19 - Carburettor; Fuel pump
18 3 505 38 13-08 502 50 18-01 Carburettor Dismantling Blow clean the carburettor compartment. Loosen the bolts (A) and remove thenuts (B). Remove the fuel hose (C) and fold thefilter holder aside. Carburettor Dismantling 1. Remove the carburettor cover and blow the carburettor compartmentclean with...
Page 26 - Carburettor settings
25 3 T Fuel system The needles must be correctly adjusted in order for the engine to give maximumpower at different speeds, run steadily while idling and to react quickly whenaccelerating. The setting of the carburettor can vary a little depending on the humidity, tempera-ture and air pressure. L = ...
Page 28 - Carburettor adjustment 345RX/FX; Throttle
27 531 00 48-63 531 03 03-98 502 50 18-01 3 Carburettor needles with Zama “caps”. Carburettor adjustment 345RX/FX Adjusting the L-needle 1. Mount the Trimmy Fix (4 wires) and use 3.3 mm smooth cord. The cord length should be 160 mm measured from theend of the cord to the cord bushing on the trimmer ...
Page 32 - Centrifugal clutch
31 4 4. Contents Dismantling ________________________________ 30 Assembly _________________________________ 32 Clutch drum _______________________________ 32 Centrifugal clutch
Page 38 - Angle gear
37 5 5. Contents Dismantling ________________________________ 36 Assembly _________________________________ 37 Shaft _____________________________________ 38 Angle gear
Page 41 - Shaft
40 5 503 80 17-01 Angle gear Shaft The shaft contains a drive axle guidethat is easily replaced. It can bedismantled once the plastic sleeve (B)has been removed. Centre the axle control in the shaftwhen a new one is fitted. Fit a new O-ring to ensure a good seal. Shaft The shaft contains a long plas...
Page 42 - Cylinder and piston
41 6 6. Contents Dismantling ________________________________ 42 Decompression valve ________________________ 43 Inlet manifold ______________________________ 44 Cleaning, inspection _________________________ 44 Assembly _________________________________ 44 Analysis and actions _____________________...
Page 44 - Decompression valve
43 531 03 06-23 502 52 42-01 6 Dismantle the piston. Push the gudgeon pin from the pistonusing punch 502 52 42-01. If the pin is too tight, carefully warm thepiston. Decompression valve Dismantle the decompression valve. Decompression valve Remove the bolt (A) and the hose (B)that connect the decomp...
Page 46 - Analysis and actions
45 6 502 50 70-01 Cylinder and piston Use a new gasket and fit the cylinder. Make sure that the inlet manifold iscorrectly connected to the sleevecoupling on the cylinder and that theimpulse nipple sits right. Place a new cylinder pedestal gasketon the cylinder. Lubricate the piston and the inletman...
Page 47 - Piston scoring caused by heavy carbon deposits
46 6 Cylinder and piston Action: Change to a fuel with the correct oilmixture. Change to a higher octane petrol. Replace damaged parts. Replace leaking gaskets and shaftseals. Clean the cooling fins and air intake. Clean or replace the spark arrestormesh. Cause: • Incorrect oil mixture in the fuel. ...
Page 48 - Piston damage caused by a too high engine speed.
47 6 Cylinder and piston Exhaust side damaged by a broken pistonring. The piston ring parts damage the topsection and cause score marks. Piston damage caused by a too high engine speed. Typical damage associated with a too high engine speed includes broken pistonrings, broken circlip on the gudgeon ...
Page 49 - Foreign objects
48 6 Cylinder and piston Small score marks and a matt, grey surfaceon the piston’s inlet side caused by finedust particles. Cause: • Faulty air filter. Small dust particlespass through the filter. • The filter is worn out due to toomuch cleaning, whereby small holeshave appeared in the material. • U...
Page 50 - Service tips
49 6 Cylinder and piston Cause: • Air filter damaged or missing. • Parts from the carburettor or intakesystem have come loose andentered the engine. Action: Fit a new air filter. Regular service and inspection. Extensive damage to the lower part of thepiston’s inlet side. Service tips Defect: Broken...
Page 51 - Wear tolerances
50 6 Cylinder and piston Wear tolerances When the surface coating isworn and aluminium appears. Max. 1.0 mm with the pistonring inserted in the lower partof the cylinder. Max. 1.6 mm. Clean the groovebefore checking the measure-ment. Max. 0.15 mm. Clean the groovebefore checking the measure-ment. Pi...
Page 52 - Crankshaft and crankcase
51 7 7. Contents Dismantling ________________________________ 52 Inspecting the crankshaft _____________________ 54 Assembly _________________________________ 55 Leakage testing the crankcase _________________ 56 Crankshaft and crankcase
Page 60 - Tools
59 8 . Tools Contents Starter __________________________________ 60 Electrical system __________________________ 60 Fuel system _____________________________ 60 Centrifugal clutch _________________________ 60 Angle gear ______________________________ 61 Cylinder and piston ________________________ 6...
Page 61 - List of tools
60 531 00 48-63 531 03 03-98 502 51 91-01 502 71 13-01 502 51 34-02 0.3 502 50 06-01 502 54 15-01 502 51 94-01 531 00 60-76 502 50 83-01 501 60 02-03 502 21 58-01 502 54 15-01 502 52 16-02 502 11 46-03 505 38 17-09 502 50 18-01 502 50 18-01 502 50 18-01 505 38 13-08 Electrical system Fuel system Cen...
