Husqvarna 33 Workshop Manual
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Husqvarna 33 Workshop Manual

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For Husqvarna Parts Call 606-678-9623 or 606-561-4983
Husqvarna 33
Workshop Manual
507 43 36-22
www.mymowerparts.com

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Summary of Contents for Husqvarna 33

  • Page 1 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Husqvarna 33 Workshop Manual 507 43 36-22 www.mymowerparts.com...
  • Page 2 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Husqvarna 33 Introduction This workshop manual is mainly intended for Husqvarna 33, but certain chapters can also be used for other models.The manual gives information about how to repair the saw and how to use our special tools.
  • Page 3 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 1 SERVICE DATA TIGHTENING TORQU 0-40 IN LB 15-25IN LB+ 45-55IN LB 25-35IN LB !ak. Q IFAL ‘ www.mymowerparts.com...
  • Page 4 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 20-30IN LB 25-35IN LB GREASE RTV SEALANT ‘ IN LB = INCH POUNDS (TORQUE) 15-25IN LB 20-30IN 25-35IN LB www.mymowerparts.com...
  • Page 5 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 504900002-4 mm .i 502516701 507430477 502500601 502 510801–(Loctite 290) 502510901 (Loctite601) ‘\, 507433550 507426814 502505101 502510601 50743360 507 43357’ o % . . . 507476554 502514602 507433302 507474329 507475467 507475606 502510201 www.mymowerparts.com...
  • Page 6 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SERVICETOOLS DESCRIPTION PART NUMBER Assembly Pliers- Spark Plug Sparkie 502 500601 Wire Strippers 502 505101 Power Arm 502 510201 Nail Polish - Welch Plug 502 501601 Loctite 290 502 510801 Loctite 601 502 510901...
  • Page 7 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 TECHNICAL SPECIFICATION ENGINE Displacement powerof Idlingspeed Engagement Bore Stroke speed @ mm inch inch cu. inch 36.5 32.5 4200 8000 3000 1.28 1.43 FUEL - AND LUBRICATION SYSTEM Automaticoil pump Oil tankvolume Fueltank volume...
  • Page 8 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 SAFETY EQUIPMENT CHAIN BRAKE CA!2 ‘, \ Release the chain brake by pulling back on the handguard. Remove the guide bar clamping nut and rear screw. Remove the clutch cover and clean the chain brake mechanism.
  • Page 9 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 . Aliow the handguard to return to the “run” position Remove the brake spring cover by prying up with a screwdriver blade. . Using the suitably sized drifts (supplied in the brake repair kit) remove both the large and small diameter roll pins.
  • Page 10 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Pull back on the brake tool to release tension on the brake ring-tool. Remove the ring-tool and allow the brake band to return to the static position. Remove the brake tool and drift.
  • Page 11 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Remove the band tool. Lubricate the components of the brake mechanism with oil or grease Holding the handguard, position all the otht= components against it. Carefully insert the complete assembly as shown. NOTE: Be sure the tang of the tension spring is in place on the casting ledge.
  • Page 12 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 NOTE: The grooves (slot) in the roll pins must face upward toward the top of the casting as shown. Be sure the brake band spring has been greased, and firmly press the spring cover into the nest provided in the casting.
  • Page 13 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 —-. --- ~ ..Ww. m.”,, B. THROTTLE CONT LOCKOUT www.mymowerparts.com...
  • Page 14 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Clean and check all parts for wear or damage. Reassemble the mechanism, handle cover and screws. Torque the cover screws to spec. (see Section 2 Service Data) .Connect the onloff switch flag terminals and snap the switch assembly into position.
  • Page 15 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 5 STARTER MECHANISM . Remove the clutch cover assembly. . Remove the three side screws securing the start- er assembly to the crankcase. www.mymowerparts.com...
  • Page 16 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 . Turn the saw on its side and remove the lower frame/starter housing shock mount screw. Clean the starter housing and mechanism. Pull the starter rope out about 10-12“. Using your thumb to resist pulley rotation, place the slack...
  • Page 17 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Using a cold-resistant grease, lubricate the starter pivot pin (center post). Oil the rewind spring coils and insert the spring cassette (metal cup next tc — the casting). Install a new starter rope. Be sure the pulley end knot nests in the pocket provided in the pulley.
  • Page 18 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Assemble the starter to the saw. NOTE: Apply Ioctite 242 to the screws. NOTES www.mymowerparts.com...
  • Page 19 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 6 ELECTRONIC SYSTEM . Move the on/off switch to the “on” position. .— . Ground the spark plug against the cylinder fin as shown. AI I nsure the spark plug is routed well away from the...
  • Page 20 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 If there is still no spark, disconnect the ignition switch wire from the on/off switch flag. Again, rapidly pull the starter. If spark is now observed, the problem is a faulty on/off switch assembly.
  • Page 21 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 . To adjust the air gap spec., loosen the 3 laminate mounting screws shown. NOTE: These screws should have Ioctite 242 applied during assembly. — Insert the air gap tool between the flywheel mag- net and the ignition module laminates.
  • Page 22 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Thread the flywheel knock-off nut on the crank- shaft to within approximately 3/16“ of touching the flywheel face. While applying a slight outward tension on the flywheel, tap the knock-off nut to “pop” the flywheel off the crankshaft taper.
  • Page 23 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Clean and check the taper on the crankshaft and in the flywheel hub. CAUTION: Be sure these tapers are dry and free from oil or grease. — Install the flywheel nut and torque to spec. (see Section 2 Service Data).
  • Page 24 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Check to ensure that the high tension lead “sparky” wire is piercing the wire core in the lead. Insert the sparky wire/lead into the rubber sparky cover. describ- Install the starter and check for spark as ed earlier in this section.
  • Page 25 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 7 CENTRIFIJGAL CLUTCH . Install the piston-stop tool. Remove the clutch assembly by tapping on a drift placed against one - of the two knock-off holes provided. Tap in the direction stamped on the clutch driver face.
  • Page 26 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 . Assemble the clutch drum and clutch in the order shown. NOTE: Be sure to lubricate the clutch drum bearing to prevent chain drag at idle speed. . Spin the clutch assembly onto the crankshaft and...
  • Page 27 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Remove the 4 screws securing the fuel/oil tank to the crankcase. Carefully slide the fuel/oil tank forward to check/ replace the gasket that forms inlet and delivery channels for the oil pump. NOTE: A collapsed gasket will restrict oil flow.
  • Page 28 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 9 FUEL SYSTEM The fuel pick-up/filter assembly is accessed by removing the fuel/oil tank cover- screws. A fouled filter will restrict fuel flow and must be replaced. The end of the fuel hose should butt tightly to the filter body.
  • Page 29 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 If the carburetor is flooding (rich beyond adjust- ment) the inlet lever may be set too high or the needle valve/seat may be worn, dirty or damageo _. Loosen the fulcrum pin clamping screw and remove the inlet lever, inlet needle, inlet spring and fulcrum pin.
  • Page 30 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Remove the gasket and pump diaphragm. NOTE: The gasket is positioned next to the pump cover. Using a needle} carefully remove the fuel inlet screen. Remove the high and low speed adjustment needles and check for damage to the needle tips.
  • Page 31 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 ASSEMBLY Install the throttle and choke valve/shati assem blies. NOTE: Check for smooth, positive action of— the spring-loaded choke/throttle inter-lock system (designed to open the throttle slightly during full choke cold starting procedures).
  • Page 32 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 . Assemble the pump section of the carburetor in the reverse order to disassembly. 4!!! Check that the angle of the fuel inlet nipple has not changed during servicing. The nipple should form a slight upward angle from being parallel to the carburetor mounting face.
  • Page 33 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 . Manipulate the carburetor to allow the dog-leg of the throttle wire and choke wire to be inserted in the throttle and choke levers. Push the fuel pick-up hose onto the carburetor in- let nipple.
  • Page 34 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Install the air filter cover. ‘- CARBURETOR ADJUSTMENTS L = Low H = High T = Idle Speed Gently seat the “H” and “L” needles (turn clock- wise open each needle one (1) turn (counter- clockwise.
  • Page 35 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 1- SCREW (IDLE) ADJUSTMENT adjust the T-screw clockwise until the chain starts to rotate. turn the screw counter-clockwise until the chain stops. the correct idle speed is 2500 RPM. LEAKAGE TEST test Carburetor Pressure Recommended pressure: 7.1 P.S.I.
  • Page 36 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 10 ENGINE UNIT DISASSEMBLY Refer to earlier manual sections and NOTE: 1) The cylinder bore is chrome plated and remove the starter, chain brake, clutch must be replaced if scuffed or scored. assembly, rear handle and frame, front...
  • Page 37 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Remove the fuel/oil tank. ,-,,: !,, >, ‘g d! +.,, Remove the crankcase end-cap and remove the crankshaft/corm rod/piston assembly. www.mymowerparts.com...
  • Page 38 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 If the corm rod/piston assembly is removed from the crankshaft, thoroughly clean all parts before reassembly. ASSEMBLY Stand the crankshaft vertically (clutch end down). Apply a heavy coat of grease to the crankpin (big end) journal.
  • Page 39 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 Oil the piston ring and ring groove. insert the pist- on/corm rod assembly into the cylinder bore NOTE: Be sure the piston ring gap/peg is facin~-, the flywheel side of the engine. . . @ Position the main bearings, clip rings and seals.
  • Page 40 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 module/laminate assembly. . Install the ignition NOTE: Do not tighten the 3 mounting screws at this time. . Slide the (symmetrical) oil pump worm gear onto the crankshaft and, using a tube-type aluminum driver, tap the gear down to within .025”...
  • Page 41 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 . Position and secure the rear handle/frame asse- mbly. NOTE: Be sure to install the shock moun ‘--, . - safety restraint strap. . Fit the front handle and lower shock mount. The upper fastener (shown) has a special “thread...
  • Page 42 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 . Assemble the muffler gasket (new), muffler body, spacer tubes and muffler cover to the cylinder. Torque the muffler bolts to spec. (see Section 2 Service Data). . Install the clutch drum and clutch assembly as discussed in an earlier section.
  • Page 43 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 11TROUBLE-SHOOTING CHART START 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 z% - IDLE ACCELERATION, DECELERATION HIGH SPEED START ACCELERATION, DECELERATION A. Hardstarting K. Will notaccelerate B.
  • Page 44 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 ADJUSTMENTS 39 40 41 42 43 27 28 29 30 31 32 33 34 35 36 37 38 Low speed needle 2. High speed needle FUEL SYSTEM Pluggedtank vent I I I I I I I...
  • Page 45 For Husqvarna Parts Call 606-678-9623 or 606-561-4983 NOTES www.mymowerparts.com...

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