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Operator’s Manual
Single Stage
Snow
Thrower
Models 521 & 721
IMPORTANT: Read safety rules and instructions carefully before operating equipment.
Warning: This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-
covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting
applicable local or state laws (if any). If a spark arrester is used, it should be maintained in
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TABLE OF CONTENTS Content Page Important Safe Operation Practices .................................................................................. 3 Assembling Your Snow Thrower ....................................................................................... 5 Know Your Snow Thrower................................................................................................. 6 Operating Your Snow Thrower ................................................................................
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SECTION 1: IMPORTANT SAFE OPERATION PRACTICES WARNING: This symbol points out important safety instructions which, if not followed, could endanger the personal safety and/or property of yourself and others. Read and follow all instructions in this manual before attempting to operate this machine. Failure to comply with these instructions may result in personal injury. When you see this symbol—heed its warning. WARNING: Engine Exhaust, some of its constituents, and certain vehicle components
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4. Never operate with a missing or damaged discharge Maintenance & Storage chute. Keep all safety devices in place and working. 1. Never tamper with safety devices. Check their proper 5. Never run an engine indoors or in a poorly ventilated operation regularly. area. Engine exhaust contains carbon monoxide, an 2. Disengage the control bail and stop engine. Wait until the odorless and deadly gas. auger/impeller come to a complete stop. Disconnect the 6. Do not operate machine while under t
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SECTION 2: ASSEMBLING YOUR SNOW THROWER Raise the upper handle in the direction shown in Unpacking From Carton Figure 1 until it clicks into the operating position. Cut along corners of the carton and lay it down flat. Make sure not to pinch or crimp the cable. Remove packing material. Tighten the hand knobs. Remove any loose parts included with unit (i.e., operator’s manual, etc.). Assembling the Discharge Chute Roll unit out of carton. Check carton thoroughly for For shipping
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SECTION 3: KNOW YOUR SNOW THROWER WARNING: Be familiar with all the controls on the snow thrower and their proper operation. Know how to stop the machine and disengage them quickly. Auger Control Handle Recoil Starter Gasoline Cap Primer Fuel Plug Key Electric Starter Spark Plug Access Discharge Chute Oil Fill Plug Choke Lever Auger Shave Plate Figure 3 Auger Control Handle Primer Button Located on the upper handle, the auger control handle Used to inject fuel directly into the carburetor to i
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SECTION 4: OPERATING YOUR SNOW THROWER The electric starter is equipped with a grounded Before Starting three-wire power cord and plug, and is designed to operate on 120 volt AC household current. WARNING: Read, understand, and follow all Determine that your house wiring is a three-wire instructions and warnings on the machine and grounded system. Ask a licensed electrician if you in this manual before operating. are not certain. The spark plug wire was disconnected for safety.
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Position the discharge chute opening by using the To Stop Engine Chute Handle to throw the snow in the desired To stop engine, turn ignition key counter-clockwise. direction. See Figure 5. Disconnect the spark plug wire from the spark plug to prevent accidental starting while equipment is unattended. Wing Knob To help prevent possible freeze-up of starter, proceed as follows: Upper Chute Run engine for a few minutes before stopping to help dry off any moisture on the engine. Elect
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To adjust, tip the snow thro wer back so that it rests If the auger seems to hesitate when rotating while the on the handle. Loosen the four lock nuts and bolts engine maintains a constant speed, an adjustment is which secure the shave plate to the housing. See necessary. Proceed as follows: Figure 7. Move the shave plate to desired position The upper hole in the control handle provides for an and retighten the nuts and bolts securely. adjustment in cable tension. To adjust, disconnect the
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Install new shave plate, making sure the heads of Replacing the Auger’s Rubber Paddles the carriage bolts are on the inside of the housing. The snow thrower auger’s rubber paddles are subject Adjust the shave plate according to instructions on to wear and should be replaced if any signs of page 8. Tighten securely. excessive wear is present. Engine IMPORTANT: Do NOT allow the auger’s rubber paddles Refer to the separate engine manual for all engine to wear to the point where portion
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SECTION 8: TROUBLESHOOTING GUIDE Problem Cause Remedy Engine fails to start 1. Fuel tank empty, or stale fuel 1. Fill tank with clean fresh gasoline. 2. Blocked fuel line 2. Clean fuel line 3. Key not in ON position 3. Insert key and turn to ON position 4. Spark plug wire disconnected 4. Connect wire to spark plug. 5. Faulty spark plug 5. Clean spark plug, readjust gap, or 6. Engine not primed replace. 7. Engine flooded with excessive priming 6. Prime engine four times. 7. Wait at least ten m
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SECTION 9: PARTS LIST FOR MODELS 521 & 721 41 39 35 44 46 32 35 35 51 38 44 44 45 40 52 24 49 26 33 47 12 43 50 17 48 42 12 17 37 18 8 14 11 36 3 21 CABLE TO BE ABOVE 34 WHEEL AXEL 20 21 53 10 16 2 28 22 3 14 27 13 4 7 23 31 1 29 25 9 17 13 12 22 10 9 28 6 30 15 19 12
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Models 521 & 721 REF. PART REF. PART NO. NO. DESCRIPTION NO. NO. DESCRIPTION 1 684-04027 Auger Ass'y 21" complete w/Solid Shaft 28 784-5174 Bearing Cup 2 684-04028 Auger Housing Ass’y 21” 29 790-00039 Idler Bracket w/Brake 3 710-0134 Screw, 1/4-20 x .62 30 790-00045 Belt Cover 4 710-0167 Carriage Bolt 1/2-20 x .50 LG 31 790-00062 Belt Keeper 5 710-0323 Truss Mach Scr 5/16-18 x .75 32 684-0178 Mitten Grip Bracket 6 710-0352 Hex "B" Tap Scr. 1/4-14 x .375" LG 33 684-04029 Shroud Ass’y, 5HP Black
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Models 521 and 721 9 3 11 11 4 1 8 2 5 6 12 10 7 REF. PART NO. NO. DESCRIPTION 1 710-04071 Carriage Screw, 5/16-18 x 1.0 2 710-0451 Carriage Bolt, 5/16-18 x.075 GR 1 3 712-3068 Hex Patch I-Nut 5/16-18‘ 4 720-0284 Handle Knob Assembly 5/16-18 5 731-04127 Lower Chute 5” Dia 6 731-04353 Ring-Lower Chute 7 731-04373 Chute, Adapter 5” Dia 8 731-04388 Handle-Chute 5” Dia 9 731-04429 Upper Chute w/Export Label 10 732-04111 Chute Adjustment Spring 11 736-0159 Flat Washer,.349 ID x .879 OD x .063 12 684
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Models 521 and 721 18 24 16 1 19 5 12 10 17 9 7 8 13 6 3 21 15 21 14 23 4 22 2 20 REF. PART NO. NO. DESCRIPTION 1 629-0071 Extension Cord 2 710-0157 Hex Screw, 5/16-24 x .75 3 710-0409 Hex Screw, 5/16-24 x 1.75 4 710-0654A Self Tapping Screw, 3/8-16 x 1.00 5 710-0751 Hex Screw, 1/4-20 x .62 6 710-1003 Screw, #10-16 x .625 7 712-0324 Hex Nut, 1/4-20 Nylon 8 719-0581 Spacer, Engine 4 Cycle 9 726-0205 Clamp, Hose 10 726-0470 Cable Tie 12 731-2825 Knob, Choke 13 736-0119 Washer, Lock 5/16 14 736-024
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MANUFACTURER’S LIMITED WARRANTY FOR: The limited warranty set forth below is given by Troy-Bilt LLC d. Troy-Bilt does not extend any warranty for products sold with respect to new merchandise purchased and used in the or exported outside of the United States, its possessions United States, its possessions and territories. and territories, except those sold through Troy-Bilt’s authorized channels of export distribution. “Troy-Bilt” warrants this product against defects in material e. Replacem
