Form No. 3423-322 Rev B Lawn-Boy® Two Stage Snowthrower Model No. 17740—Serial No. 400000000 and Up P a rts Ca ta lo g Register at www.LawnBoy.com.
Ordering Replacement Parts For example, a wheel assembly might be identified by reference number 6, the tire by 6:1, the valve by 6:2, and the wheel by 6:3. When you order the assembly identified by reference number 6, you receive all parts identified by reference numbers 6:1,6:2, and 6:3. However, you may also order any part individually. Reference numbers of this type appear in illustration and in parts lists.
Contents Main Frame and Auger Housing Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pulley and Bellcrank Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Impeller Drive Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Frame and Auger Housing Assembly 3423-322B 4 A2
Main Frame and Auger Housing Assembly (continued) Ref. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Part Number Qty. Description 46-8091 6 Screw-HWH 52-2861 4 Washer 94-2413 4 Nut-U 106-4588-02 2 Skid 114-3751 1 Screw-HWH, Plastite 121-6833 1 Stick-Cleanout 119-7626 1 Guide-Chute 119-7601-02 1 Scraper-24 Inch 120-7158-02 1 Cover-Liner 120-7159 1 Cover 120-7161-02 1 Brace-Frame 137-3412-03 1 Support-Chute 120-7177 1 Cover-Belt 120-7178 1 Cover-Lower Ref. 15 16 17 17:2 18 21 22 23 24 25 28 30 35 5 Part Number Qty.
Pulley and Bellcrank Assembly 3423-322B 6 B2
Pulley and Bellcrank Assembly (continued) Ref. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Part Number Qty. Description 3-4244 1 Pulley-Idler 92-9698 1 Screw-Shoulder 38-7820 2 Bearing-Ball 25-5640 1 Washer 117-7711 1 Bushing-Idler 119-7645 1 Plate-Wheel, Friction 136-7152 1 Traction Pulley ASM 136-7124 1 Retainer-Bearing 119-7670-03 1 Bellcrank-Drive 136-7153 1 Spring-Extension 119-7679 1 Bracket-Plate, Traction 120-3883 1 Spring-Extension 137-3435 1 Spring-Extension 120-7156 2 Bushing-Plate, Traction Ref.
Impeller Drive Assembly 3423-322B 8 B3
Impeller Drive Assembly (continued) Ref. 1 2 3 4 5 6 Part Number Qty. Description 3-4244 1 Pulley-Idler 66-8060 1 Pad-Brake 136-8674 1 Bolt-Pivot, Eccentric 120-7167 1 Bushing-Rod, Clutch 120-9254-03 1 Impeller Clutch ASM 120-9256 1 Pivot-Brake, Impeller Ref. 7 8 9 10 11 12 9 Part Number Qty.
Drive Assembly 3423-322B 10 B4
Drive Assembly (continued) Ref. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Part Number Qty. Description 3-8664 3 Washer-Thrust 119-1567 1 Wheel-Friction 107-3039 2 Klik Pin ASM 120-7950 3 Screw-Shoulder 119-7613 1 Gear-Axle 119-7615 1 Shaft-Hex 119-7616 1 Gear-Pinion, 8 Tooth 121-6835 3 Bearing-Ball 119-7630 1 Trunnion 119-7684 1 Spacer-Plate, Shift 120-7162 2 Bushing-Axle 120-7180 1 Axle 120-7191 1 Retainer-Plate, Shift 120-7193-03 1 Shift Plate ASM 136-7158 2 Retainer-Bearing Ref.
Gearbox, Auger and Impeller Assembly 3423-322B 12 C2
Gearbox, Auger and Impeller Assembly (continued) Ref. 2 3 4 5 6 Part Number Qty. Description 119-7612-03 1 Impeller ASM 120-3859 1 Gearcase ASM 120-3860 2 Bearing-Auger 120-3862 2 Washer-Thrust 120-9287-03 1 LH Auger ASM Ref. 7 9 10 11 12 13 Part Number Qty.
24 Inch Auger Gearcase Assembly No.
24 Inch Auger Gearcase Assembly No. 120-3859 (continued) Ref. 1 1:2 1:3 2 3 4 5 6 7 Part Number Qty. Description 121-1209 1 RH Auger Gearcase ASM 121-6634 1 Seal-Shaft 120-9269 1 Bushing-Sleeve 119-7640 4 Washer-Thrust 120-3858 1 Shaft-Output, Auger 3257-5 1 Key-Woodruff 119-1576 1 Gear-Helical, 20 Tooth 119-7635 1 Bushing-Input 119-7636 1 Collar-Thrust Ref. 8 9 10 11 12 12:2 12:3 13 14 15 Part Number Qty.
Impeller Assembly 3423-322B 16 C3
Impeller Assembly (continued) Ref. 1 2 3 4 5 Part Number Qty. Description 26-6110 1 Flange-Cup, Bearing 26-6120 1 Flange-Cup, Bearing 136-7157 1 Pulley-Impeller 120-9264 1 Hub-Impeller, Pulley 120-9272 1 Bearing Ref. 6 7 8 9 10 17 Part Number Qty.
Engine Assembly 3423-322B 18 D2
Engine Assembly (continued) Ref. 1 2 3 4 5 6 7 Part Number Qty. Description 127-9034 1 Engine-G210Fds-1 120-3892 1 Belt-V 120-3893 1 Belt-V 136-7156 1 Guide-Belt 120-9283 1 Pulley-Auger, Rear 120-9284 1 Pulley-Auger, Front 121-6804 2 Pulley-Traction Ref. 8 9 10 11 12 13 14 19 Part Number Qty.
Fuel System and Carburetor Assembly 3423-322B 20 02
Fuel System and Carburetor Assembly (continued) Ref. 1 2 2:2 3 5 6 7 8 9 Part Number Qty. Description 133-9823 1 Cap-Fuel 127-9497 1 Fuel Tank And Filter ASM 127-9065 1 Filter-Fuel 121-0294 1 Screw-HHF 127-9120 1 Clamp-Hose 127-9118 1 Hose-Fuel, Formed 121-0087 3 Clamp-Hose 120-4236 1 Nut-Flange 127-9117 1 Valve-Fuel Ref. 10 11 12 13 14 15 16 17 99 Part Number Qty.
Intake and Exhaust Assembly 3423-322B 22 03
Intake and Exhaust Assembly (continued) Ref. 1 2 3 4 5 Part Number Qty. Description 121-0294 6 Screw-HHF 136-7779 1 Guard-Muffler 121-0199 2 Nut-HH 127-9128 1 Muffler ASM 121-0167 1 Gasket-Exhaust Ref. 6 7 8 9 23 Part Number Qty.
Ignition and Electrical Assembly 3423-322B 24 04
Ignition and Electrical Assembly (continued) Ref. 1 2 3 4 5 6 7 8 9 10 Part Number Qty. Description 121-0306 2 Screw-Bhp 121-0312 2 Washer-Plain 136-7776 1 Motor-Starter 133-1546 2 Screw-Flange 121-0055 2 Pin-Dowel 121-0047 1 Nut-Flange 127-9106 1 Cup-Starter 127-9002 1 Fan 127-9005 1 Flywheel 121-0284 1 Switch-Kill, Engine Ref. 11 12 13 14 15 16 17 18 19 25 Part Number Qty.
Crankcase Assembly 3423-322B 26 05
Crankcase Assembly (continued) Ref. 1 2 3 4 5 6 7 8 Part Number Qty. Description 133-9837 1 Oil Fill ASM 127-9123 1 Screw-HHF 121-4114 6 Screw-HHF 133-9805 1 Plug-Drain 121-0209 1 Seal-Oil 133-9835 1 Crankcase Cover ASM 121-0105 1 Gasket-Cover, Crankcase 121-0054 2 Pin-Dowel Ref. 9 10 11 13 14 15 16 17 27 Part Number Qty.
Governor Assembly 3423-322B 28 06
Governor Assembly (continued) Ref. 1 2 3 4 5 6 7 Part Number Qty. Description 120-4236 1 Nut-Flange 120-4238 1 Bolt-Arm, Governor 127-9102 1 Arm-Governor 120-4256 1 Pin-Hair 136-7763 1 Shaft-Governor 121-0498 1 Washer-Plain 133-9994 1 Governor Gear ASM Ref. 8 9 10 11 12 13 29 Part Number Qty.
Piston and Head Assembly 3423-322B 30 07
Piston and Head Assembly (continued) Ref. 1 2 3 4 5 6 7 8 9 10 11 12 13 Part Number Qty. Description 120-4454 4 Screw-HHF 127-9094 1 Cover-Valve 127-9408 1 Clamp-Hose 127-9095 1 Tube-Breather 121-0109 1 Gasket-Cover, Valve 121-4110 4 Screw-HHF 81-3250 1 Spark Plug 127-9013 1 Head-Cylinder 127-9000 1 Gasket-Head, Cylinder 121-0053 2 Pin-Dowel 120-4475 2 Rocker Arm ASM 121-4120 1 Plate-Guide, Push Rod 121-4121 2 Rod-Push Ref. 14 15 16 17 18 19 20 21 22 23 24 25 31 Part Number Qty.
Blower Housing and Shrouds Assembly 3423-322B 32 08
Blower Housing and Shrouds Assembly (continued) Ref. 1 2 3 4 5 6 7 8 9 Part Number Qty. Description 121-0118 4 Screw-HHF 127-9097 1 Baffle 127-9383 2 Nut-Acorn 127-9116 1 Panel-Control 121-0268 1 Knob-Valve, Fuel 121-0305 1 Screw-Bhp 127-9096 1 Shroud-Lower 127-9107 1 Block-Rubber 127-9110 2 Stud-Mount Ref. 10 11 12 12:1 13 14 15 16 33 Part Number Qty.
Engine Decal Assembly 3423-322B 34 D3
Engine Decal Assembly (continued) Ref. 3 4 Part Number Qty.
Chute Assembly 3423-322B 36 E4
Chute Assembly (continued) Ref. 1 4 5 6 8 9 10 13 14 15 16 17 18 19 20 Part Number Qty. Description 46-8091 6 Screw-HWH 136-7199 1 Bolt-Shoulder 136-7191 2 Clamp-Cable 136-8672 1 Hinge Pin-Deflector 139-1557 1 Trigger-Deflector 119-7627 1 Ring-Chute 133-5590 1 Chute-Discharge 120-3852 1 Mount-Chute, Discharge 120-3853 1 Gear-Chute 120-3854 1 Gear-Bevel 120-3855 1 Mount-Gear, Bevel 120-3856 1 Washer-Flat 120-3869 1 Latch-Chute 136-7154 1 Spring, Chute Latch 136-7136 2 Spring-Compression Ref.
Handle and Control Assembly 3423-322B 38 G2
Handle and Control Assembly (continued) Ref. 1 2 3 4 6 7 8 9 12 13 14 15 16 Part Number Qty. Description 137-3100 3 Screw-Plastite, HWH 137-3103 1 Screw-Shoulder, HH 105-9999 1 Knob-Shift, LH 106-4423 1 Knob-Shift, RH 137-3009 4 Washer-Cup 137-3107 8 Screw-Handle 136-7121 1 Spring-Compression 136-7193 1 Trunnion-Rod 120-7173-03 1 Handle-Upper, LH 120-7174-03 1 Handle-Upper, RH 120-7194 1 Panel-Control, Master 120-9251-03 1 Support-Panel, Control 120-9258-03 1 Mount-Selector, Speed Ref.
Control Assembly 3423-322B 40 G3
Control Assembly (continued) Ref. 1 2 3 4 5 6 7 8 Part Number Qty. Description 98-3499 1 Washer-Flat 121-6812 1 Cable-Auger 121-6813 1 Cable-Traction 121-1200 1 Handle-Control, Traction 121-1201 1 Handle-Control, Auger 136-7125 1 Rod-Lockout 121-1203 1 Cam-Lockout 136-7160 1 Link-Lockout Ref. 9 10 11 12 13 14 15 41 Part Number Qty.
Quick Lever Assembly 3423-322B 42 H2
Quick Lever Assembly (continued) Ref. 1 2 3 4 5 6 7 Part Number Qty. Description 94-4496 6 Screw-PPH 120-3868 1 Lever-Control, Chute 138-8456 1 Cap-Chute Control Lever 120-7163 1 Cable-Release, Chute 121-1244 1 Chute Rod ASM 121-1246 1 Insert-Lever, Quick 121-1247 1 Screw-Shoulder Ref. 8 9 10 11 12 13 43 Part Number Qty.
Attachments and Accessories For 17740 Lawn-Boy Two Stage Snowthrower Product Name Model/Part Non-Marking Skid Kit .............................................................................................................................38211 Heavy-Duty Skid Kit.............................................................................................................................. 38212 Drift Breaker Kit ...............................................................................................
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