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Husqvarna 333RB Mark II, Workshop Manual, Page: 44 / 48

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Husqvarna 333RB Mark II Workshop Manual Download Page 44

Idle speed (low speed)
The engine stops at idle speed.

The stop screw for the throttle does not operate correctly.
Blocked fuel filter.
Blocked fuel hose.
Air in fuel pipes.
The needle valve is defective.
Defective heat insulation seal.
The lever arm of the needle valve is too high.
The lever arm of the needle valve does not operate correctly.
The needle valve spring is damaged.
The needle valve spring is not attached correctly.
The needle valve is worn.
Object in the needle valve groove.

High speed
Unsatisfactory performance at high speed.

Blocked fuel filter.
Blocked fuel hose.
Air in fuel pipes.
Incorrect/unsatisfactory fuel.
The needle valve is defective.
The carburetor is not attached correctly.
The lever arm of the needle valve is damaged.
The lever arm of the needle valve does not operate correctly.
The needle valve spring is damaged.
The needle valve spring is not attached correctly.
The needle valve is worn.
Object in the needle valve groove.

Increase and decrease speed
The engine does not increase speed.

Blocked fuel filter.
Blocked fuel hose.
Air in fuel pipes.
The needle valve is defective.
The carburetor is not attached correctly.
The lever arm of the needle valve is damaged.
The lever arm of the needle valve is too low.
The lever arm of the needle valve does not operate correctly.
The needle valve spring is not attached correctly.
Blocked needle valve.

44 - Troubleshooting

1291 - 001 - 27.09.2019

Summary of Contents for 333RB Mark II

Page 1: ...Workshop manual 333RB Mark II English 1291 001 27 09 2019 ...

Page 2: ...Function overview 6 1 Type plate Product serial number 10 6 2 Fuel 10 7 Repair instructions 7 1 Product overview for repair instructions 11 7 2 To clean and examine the product parts 12 7 3 Starter 12 7 4 Muffler 15 7 5 Air filter 16 7 6 Fuel tank 16 7 7 Carburetor 18 7 8 Ignition system 24 7 9 Centrifugal clutch 29 7 10 Cylinder and piston 30 7 11 Crankshaft and crankcase 34 7 12 Harness frame 38...

Page 3: ...tand the manual 1 3 Revisions Changes to the product can cause changes to the maintenance work and spare parts Separate information is sent out for each change Read the manual together with all received information about changes to maintenance and spare parts for the product 1 4 Safety WARNING All personnel that repair or do servicing on the product must read and understand the safety instructions...

Page 4: ...duct can result in permanent hearing loss 2 4 Symbols on the product WARNING This product is dangerous Injury or death can occur to the operator or bystanders if the product is not used carefully and correctly To prevent injury to the operator or bystanders read and obey all safety instructions in the operator s manual Please read the operator s manual carefully and make sure that you understand t...

Page 5: ...arp and not damaged Make sure the blade is installed correctly in the center position Examine the trimmer head Make sure that the idle speed functions correctly Examine the locknut Do a check of fuel leaks Examine the transport guard Examine the starter rope handle and the starter rope Make sure that the bevel gear grease is sufficient Clean the external part and the adjacent areas of the carburet...

Page 6: ... mm 3 4 Nm 4 mm 2 3 Nm 10 mm 7 9 Nm 10 mm 7 9 Nm 4 mm 3 5 Nm 4 mm 4 6 Nm 4 mm 4 6 Nm 19 mm 18 20 Nm 13 mm 18 20 Nm 13 mm 18 20 Nm 17 mm 18 20 Nm 4 mm 6 8 Nm 5 mm 6 8 Nm 4 mm 3 5 Nm 4 mm 6 8 Nm 4 mm 6 8 Nm 4 mm 6 8 Nm 5 mm 8 10 Nm 4 mm 6 8 Nm 6 Servicing data 1291 001 27 09 2019 ...

Page 7: ...0 8 1 5 Nm 5 mm 4 6 Nm 0 6 1 Nm 1 5 2 5 Nm 0 6 1 Nm 4 mm 1 5 2 5 Nm 4 mm 3 5 Nm 19 mm 18 20 Nm 5 mm 3 5 Nm 5 mm 6 8 Nm 1 2 2 Nm 1 2 2 Nm 1 2 2 Nm 1291 001 27 09 2019 Servicing data 7 ...

Page 8: ...5 Servicing tools 5 1 Servicing tools 11 9 3 12 13 14 10 1 2 4 5 6 7 8 15 16 8 Servicing tools 1291 001 27 09 2019 ...

Page 9: ...he fuel filter 502 50 83 01 10 Pin Lock the angle gear 502 02 61 02 11 Carburetor adjustment screwdriver Adjust the carburetor settings 501 60 02 03 12 Tachometer Measure the engine rpm 502 71 14 01 13 Grease Lubricate the parts in the angle gear 503 97 64 01 14 Hex key 4 mm 502 50 18 01 14 Hex key 5 mm 502 50 64 01 15 Air gap tool 0 3 mm Adjustment of the ignition module 502 51 34 02 16 Drift Dis...

Page 10: ...e correct oil CAUTION Do not use two stroke oil for water cooled outboard engines also referred to as outboard oil Do not use oil for four stroke engines 6 2 4 To mix gasoline and two stroke oil Gasoline l Two stroke oil l 2 50 1 5 0 10 10 0 20 15 0 30 20 0 40 CAUTION Small errors can change the ratio of the mixture when you mix small quantities of fuel Measure the quantity of oil carefully and ma...

Page 11: ...ct overview for repair instructions 5 3 4 7 9 1 2 6 8 12 13 14 10 11 1 Starter 2 Muffler 3 Air filter and air filter holder 4 Carburetor 5 Clutch drum cover and clutch drum 6 Ignition module 1291 001 27 09 2019 Repair instructions 11 ...

Page 12: ...re necessary Replace damaged or defective parts Always use original spare parts 7 3 Starter 7 3 1 To disassemble the starter WARNING Use protective glasses to prevent injury to the eyes if the recoil spring ejects 1 Pull up the knob and remove the shaft 2 Remove the 4 screws and pull out the starter and the gasket 3 Pull out the starter rope approximately 30 cm 4 Put your thumb on the starter pull...

Page 13: ...assemble the starter refer to To disassemble the starter on page 12 2 Put the recoil spring in the starter groove of the starter housing 3 Push down the recoil spring with your thumb on the inner side of the starter housing 4 Move your thumb around the edge of the starter housing and push down the recoil spring turn after turn 7 3 3 To replace the starter rope in the starter pulley 1 Pull the star...

Page 14: ... pulley down into the starter housing and tighten the screw 3 Pull the starter rope through the starter rope handle 4 Make a small knot on the starter rope and pull the knot into the handle 5 Tighten the recoil spring a Pull out the starter rope fully and slow the starter pulley with your thumb b Lift the starter rope up and out of the groove on the starter pulley Turn the starter pulley countercl...

Page 15: ... assembly if it is damaged 6 Install the starter pawl assembly in the opposite sequence 7 4 Muffler 7 4 1 To remove and install the muffler 1 Remove the 3 screws and the muffler cover 2 Remove the 2 screws the muffler and the heat shield 3 Install the muffler in the opposite sequence 7 4 2 To clean and examine the muffler WARNING Risk of burn injury or fire Mufflers with catalytic converters becom...

Page 16: ...retor clean or replace the air filter holder remove the 2 screws E and the air filter holder F A B C D E F 6 Install the air filter in the opposite sequence 7 5 2 To clean and examine the air filter CAUTION Do not use gasoline to clean the air filter it will damage the air filter 1 Examine the air filter If the air filter is damaged replace it with a new air filter 2 Clean the air filter with warm...

Page 17: ...he 4 screws and pull up the engine from the fuel tank 7 6 3 To clean and examine the fuel tank 1 Disassemble the fuel tank cap for cleaning Use a screwdriver to remove the housing A that contains the check valve B and cover C 2 Use compressed air to clean the filter D and the hole in the fuel tank cap E 3 Examine the check valve a Press the sides of the check valve to see a small space G If you ca...

Page 18: ...6 17 2 6 1 1 Fuel pump system 2 Primer bulb 3 Idle position 4 Throttle control system 5 High speed position 6 Main nozzle 7 Check valve 8 Outlet tube 9 Inlet tube 10 Air intake 11 Throttle valve 12 Pump chamber 13 Pump diaphragm 14 Pump body 15 Pump cover 16 Pulse hole 17 Metering chamber 7 7 2 The function of the carburetor Refer to Carburetor structure on page 18 for the illustration for this te...

Page 19: ...hen the engine operates at idle speed the throttle valve 11 is in the idle position 3 The idle position means that the throttle valve of the carburetor is not fully closed When the engine does not operate at full speed the throttle valve is in the part throttle position The part throttle position means that the throttle valve of the carburetor is not fully open When the engine operates at high spe...

Page 20: ...wire from the carburetor E F G J K L M N I H E 4 Remove the 2 screws F and remove the air filter housing G if it is necessary 5 Remove the fuel hoses H and I from the carburetor and remove the carburetor J and gasket K 6 Remove the 2 screws L the distance piece M and gasket N if it is necessary 7 Remove the 2 screws O and lift off the throttle mechanism Loosen the valve stop screw P Make sure that...

Page 21: ...gm in front of a light to find holes in the material Clean the fuel screen W Replace the fuel screen if it is damaged Use a needle tip to remove the fuel screen W V V 11 Loosen the screw X and remove the lever the axle the needle valve and the spring Be careful to prevent that the spring ejects X 12 Examine the lever arm and the needle valve for wear a Examine the connection points against the con...

Page 22: ...distance piece for cracks and damage that can result in leakage Replace the distance piece if it is damaged c Make sure that the lever arm is flush with the diaphragm housing If the lever arm is set too high too much fuel goes into the carburetor If the lever arm is set too low a too small quantity of fuel goes into the carburetor d Replace the nozzle of the carburetor if it is damaged Use a small...

Page 23: ... at the factory before the product is supplied An adjustment of the idle speed can become necessary because of changes in the operation conditions for example in the air WARNING If the cutting attachment does not stop when you adjust the idle speed speak to your servicing dealer Do not use the product until it is correctly adjusted or repaired Make sure that the throttle wire is parallel with the ...

Page 24: ...el mixture is correct c Make sure that the air filter is clean If the spark plug is dirty clean it and make sure that the electrode gap is correct refer to Technical data on page 46 Replace the spark plug if it is necessary 7 8 3 To do a spark test of the ignition module 1 Disconnect the spark plug cable from the spark plug 2 Disconnect the spark plug from the cylinder 3 Connect the ignition teste...

Page 25: ... to make the new hole 6 Put the spring into the new hole 7 Put the cable with the open spring into the other slot in the pliers Close the pliers to bend the spring CAUTION Make sure that the spring is bent 90 degrees along the cable 8 Lubricate the cap with soap and water or equivalent to make it easier to push it into position 9 Push the cable into the spark plug cap 1291 001 27 09 2019 Repair in...

Page 26: ...cal shock 7 8 5 To disassemble the ignition system 1 Pull up the knob and remove the shaft 2 Remove the spark plug cap 3 Remove the spark plug 4 Put a piston stop in the spark plug hole to prevent movement of the piston 5 Disconnect the throttle wire from the carburetor 6 Disconnect the cables 7 Remove the 3 screws A and the muffler cover B A A C B D E F G 26 Repair instructions 1291 001 27 09 201...

Page 27: ...the screws the washers the cables and the ignition module 13 Remove the 2 screws and the 2 washers that hold the centrifugal clutch Remove the centrifugal clutch and the 2 washers between the flywheel and the centrifugal clutch 14 Attach the flywheel puller apart from the center unit on the flywheel 15 Hold the flywheel puller and loosen and remove the flywheel nut 1291 001 27 09 2019 Repair instr...

Page 28: ...eyway in the flywheel and the keyway in the crankshaft are not damaged Make sure that the key is not damaged 3 Attach the flywheel and the centrifugal clutch with the spacers and screws as shown in the illustration Note Turn the clutch until you can see the arrows that show the direction of rotation 4 Assemble the cables to the ignition module Use the 2 screws and the 2 washers to assemble the ign...

Page 29: ... opposite sequence Refer to To disassemble the ignition system on page 26 7 9 Centrifugal clutch 7 9 1 To remove the centrifugal clutch 1 Pull up the knob and remove the shaft 2 Remove the 4 screws Remove the clutch drum assembly 3 Put a piston stop in the spark plug hole to prevent movement of the piston 1291 001 27 09 2019 Repair instructions 29 ...

Page 30: ...maged parts 3 Clean all parts 7 9 3 To examine the clutch drum 1 Examine the clutch drum for wear Replace the clutch drum if it is worn or damaged 2 Measure the diameter of the clutch drum Replace the clutch drum if the diameter is more than mm 7 9 4 To install the centrifugal clutch 1 Put some grease on the clutch screw but not on the thread 2 Install the centrifugal clutch in the opposite sequen...

Page 31: ...ss to the cylinder and piston 2 Loosen the 4 bolts and pull the cylinder up 3 Remove the cylinder base gasket 4 Put a cloth on top of the crankcase opening to make sure that no dirt goes into the crankcase 5 Use a pointed tool to remove the G snap rings for the wrist pin 6 Push the wrist pin from the piston with a punch of the correct dimension 7 Remove the piston and the needle bearing from the r...

Page 32: ... is not worn especially in the top end of the cylinder Make sure that the cylinder does not have score marks 7 10 5 To examine the piston Make sure that the piston ring can move freely in the groove Examine the surface of the piston for damage and wear Examine the piston pin Refer to To examine the piston pin on page 33 Examine the snap rings If the snap rings have cracks or discoloration replace ...

Page 33: ...s or damages 7 10 6 To assemble the cylinder and piston 1 Carefully put the piston ring on the piston Make sure that you do not cause damage to the piston ring or the piston 2 Lubricate the needle bearing with two stroke oil and put it into the connecting rod Make sure the needle bearing moves freely in the connecting rod 3 Attach the piston to the connecting rod Point the arrow at the piston top ...

Page 34: ...case 7 11 1 To disassemble the crankshaft and crankcase To get access to the crankshaft and crankcase you must remove all components of the product Refer to the manual section for each component for instructions 1 Remove the starter Refer to To disassemble the starter on page 12 2 Remove the ignition system Refer to To disassemble the ignition system on page 26 3 Remove the muffler Refer to To rem...

Page 35: ...placed if it is worn or damaged 1 Examine the large end of the connecting rod Replace the crankshaft if you see scratch marks discoloration on the sides or damaged needle holders 2 Examine the small end of the connecting rod Replace the crankshaft if you see scratch marks or discoloration in the bearing track 3 Examine the bearing Make sure the connecting rod does not have radial play Make sure th...

Page 36: ...sealing ring on the flywheel side must be 0 5 1 mm below the edge of the bearing seat Make sure that the sealing ring levels with the crankcase on the starter side 3 Attach the crankshaft a Lubricate the stub axle of the crankshaft and the large end of the connecting rod with some drops of two stroke oil Do not put oil on the threads b Carefully move the crankshaft C into the bearing in the crankc...

Page 37: ... the wrist pin in the slots c Put the flywheel key in the crankcase keyway with the flat surface parallel to the center line of the crankshaft d Attach the flywheel 7 Attach and lubricate the cylinder a Put the cylinder base gasket G in the correct position b Put the plate from the piston assembly kit H below the piston to make sure that the piston is stable c Lubricate the piston and piston rings...

Page 38: ... to the ignition module 4 Remove the nut A and the washers B and C C B A 5 Remove the engine from the support plate on the harness frame 7 13 Handle and throttle trigger 7 13 1 To disassemble the handle 1 Remove the 7 screws and 2 nuts 2 Remove the handles halves from the rod 3 Remove the throttle trigger A and the spring B Remove the spring C Remove the throttle lock D C A B D 4 Remove the thrott...

Page 39: ...he black cable G and red cable F in the cable retainer K Install the cable retainer on the left handle half Assemble the stop switch H on the throttle G F K H 2 Attach the connection plate J and the screw I below the stop switch H Use the correct torque see Overview of the carburetor on page 19 I J H 3 Attach the throttle wire E in the throttle trigger A Put the spring B into the hole L in the thr...

Page 40: ...C H A B D 5 Put the shaft in the left handle half and attach the right half with the screws and the nuts Make sure to use the correct torque see Servicing data on page 6 7 14 Gearbox 7 14 1 To remove the gearbox 1 Put a rod through the hole B to lock the axle J C Y A G F E D B H I 2 Remove the trimmer head A 3 Remove the support flange Y 4 Remove the protective plate C 5 Remove the screw D the scr...

Page 41: ...assembly 6 Remove the input shaft assembly O from the gearbox T V U X P O S R Q P 7 Increase the temperature of the gearbox to approximately 140 C 8 Remove the bearing T on the output shaft If it is necessary hit the gearbox against a wooden block until the bearing falls out 9 Remove the the gear V and bearing X from the output shaft U 10 If it is necessary to replace the bearings R and Q remove t...

Page 42: ...ion is attached 7 Make sure that the gearbox is approximately 110 C 8 Put the input shaft assembly into the gearbox with a pair of pliers or a sleeve 9 Attach the snap ring L for the bearing on the output shaft K L N M 10 Attach the bushing K on the output shaft 11 Attach the grease plug N 12 Attach the snap ring M for the bearings on the input shaft 13 Fill the gearbox with grease about 10 to 12 ...

Page 43: ...uretor is not attached correctly The lever arm of the needle valve does not operate correctly The idle speed is too low Defective heat insulation seal The lever arm of the needle valve is damaged The lever arm of the needle valve is too high The lever arm of the needle valve does not operate correctly The needle valve is worn Object in the needle valve groove The idle speed does not become stable ...

Page 44: ...ect unsatisfactory fuel The needle valve is defective The carburetor is not attached correctly The lever arm of the needle valve is damaged The lever arm of the needle valve does not operate correctly The needle valve spring is damaged The needle valve spring is not attached correctly The needle valve is worn Object in the needle valve groove Increase and decrease speed The engine does not increas...

Page 45: ...sed The lever arm of the needle valve is too high The lever arm of the needle valve does not operate correctly The needle valve is worn Object in the needle valve groove The engine cannot increase speed Defective heat insulation seal 1291 001 27 09 2019 Troubleshooting 45 ...

Page 46: ...valent sound pressure level at the operator s ear measured according to EN ISO 11806 and ISO 22868 dB A min max 84 8 Vibration levels2 Equivalent vibration levels ahv eq at handles measured according to EN ISO 11806 and ISO 22867 m s2 Front handle m s2 4 6 Rear handle m s2 5 0 Product data Maximum rpm output shaft 7800 Output shaft thread M10x1 25 Lefthanded Tube diameter mm 26 Tube length mm 1430...

Page 47: ...1291 001 27 09 2019 Technical data 47 ...

Page 48: ...1141571 26 2019 09 30 ...

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