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                        Safety • Assembly • Operation •  Adjustments • Maintenance • Troubleshooting • Parts Lists • Warranty
OPERATOR’S MANUAL
21” Self-Propelled Mulching Mower — Model Series V550
IMPORTANT
READ SAFETY RULES AND INSTRUCTIONS CAREFULLY BEFORE OPERATION
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 applicabl
                    
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                        This Operator’s Manual is an important part of your new lawn mower. It will help you assemble,   prepare, and maintain the unit for best performance. Please read and understand what it says.  Table of Contents Slope Gauge........................................................ 3 Maintaining Your Lawn Mower ......................... 10 Safe Operation Practices ................................... 4 Troubleshooting ................................................ 12 Setup and Adjustment ...........
                    
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                        Use this page as a guide to determine slopes where you may not operate safely.  Do not operate your lawn mower on such slopes. 1 Slope  Gauge  WARNING  Do not mow on inclines  with a slope in excess  of 15 degrees (a rise   of approximately 2-1/2  feet every 10 feet).   Operate WALK-BEHIND    mowers across the  face of slopes, never  up and down slopes.  3                                                                                                                                              
                    
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                        WARNING: Engine Exhaust, some of its constituents, and certain vehicle compo- nents contain or emit chemicals known to State of California to cause cancer and  birth defects or other reproductive harm. 2 DANGER: This machine was built to be operated according to the rules for safe operation in this  manual. As with any type of power equipment, carelessness or error on the part of the operator  can result in serious injury. This machine is capable of amputating hands and feet and throwing  Safe  
                    
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                        19. Shut the engine off and wait until the blade comes to a 6. Extinguish all cigarettes, cigars, pipes and other sources   complete stop before removing the grass catcher or unclog- of ignition. ging the chute.   7. Never fuel machine indoor because flammable vapors will  The cutting blade continues to rotate for a few seconds after  accumulate in the area. the engine is shut off. Never place any part of the body in  8. Never remove gas cap or add fuel while engine is hot or  2 the blade area u
                    
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                        1. Remove any packing material which may be between  upper and lower handles.  a. Pull up and back on upper handle as shown in  A Figure 3-1. Make certain the lower handle is seated  3 securely into the handle mounting brackets.  b. Tighten star knobs securing upper handle to  lower handle. Make sure that each carriage bolt is  Setup and  seated properly in the handle. 2. Locate hairpin clip in one hole on the weld pin on each  Adjustment side of lower handle. See Figure 3-2. a. Remove hairpin c
                    
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                        6. Follow steps below to assemble the grass catcher: a. Place bag over frame so that its black plastic side  is at the bottom. b. Slip plastic channel of grass bag over hooks on  3 the frame. See Figure 3-6. All the plastic channels  except center top of bag attach from outside of  bag.  Setup and  B c. Attach center top of bag from inside of bag. 7. Follow steps below to attach grass catcher: Adjustment A a. Lift rear discharge door. b. Place grass catcher on the pivot rod. Let go  C of dischar
                    
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                        Know Your Lawn Mower Drive Control Blade Control 4 Operating  Your Lawn  Recoil  Starter Mower WARNING Cutting Height  The blade control  Adjustment Levers mechanism is a  safety device. Never  Figure 4-1 attempt to bypass its  Now that you have set up your lawn mower for opera- Cutting Height Adjustment Levers operations. tion, get aquainted with its controls and features. These  One adjustment lever is located on each wheel and is  are described below and illustrated on this page. This  used t
                    
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                        Starting Engine WARNING: Be sure no one other than  the operator is standing near the lawn  mower while starting engine or operat- 4 ing mower. Never run engine indoors or  3 in enclosed, poorly ventilated areas. Engine exhaust  contains carbon monoxide, an odorless and deadly  gas. Keep hands, feet, hair and loose clothing away Operating  from any moving parts on engine and lawn mower.  Your Lawn  Follow the set of instructions pertaining to your unit.  Refer to engine manual for help with the 
                    
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                        Lubrication 1. Lubricate pivot points on the blade control at least  once a season with light oil. The blade control must  operate freely in both directions. See Figure 5-1. 5 2. Lubricate the wheels at least once a season with  light oil (or motor oil). If  wheels are removed for any  reason, lubricate surface of the pivot arm and inner  surface of the wheel with light oil. See Figure 5-1. Maintaining  3. Lubricate the torsion spring and pivot point on the rear  discharge door periodically with
                    
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                        Blade Care WARNING: When removing cutting  blade for sharpening or replacement,  protect your hands with a pair of heavy  5 gloves or use a heavy rag to hold blade. 1. Disconnect spark plug wire from spark plug. Turn  mower on its side making sure that the air filter and  Maintaining  the carburetor are up. 2. Remove bolt, bell washer, blade, and blade adapter  Your Lawn  from the engine crankshaft. See Figure 5-3. Mower NOTE: When removing these items, the pulleys and  washers may also break fr
                    
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                        Problem Remedy Cause 1. Engage blade control. 1. Blade control disengaged. Engine fails to start 2. Spark plug wire disconnected. 2. Connect wire to spark plug. 6 3. Fuel tank empty or stale fuel. 3. Fill tank with clean, fresh gasoline. 4. Prime engine as instructed in “Operat- 4. Engine not primed (if equipped with  ing Your Lawn Mower”. primer). 5. Clean, adjust gap, or replace. 5. Faulty spark plug. Trouble  6. Blocked fuel line. 6. Clean fuel line. 7. Engine flooded. 7. Wait a few minutes t
                    
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                        4. Coat mower’s cutting blade with chassis grease to  Off-Season Storage prevent rusting. The following steps should be taken to prepare your lawn  mower for storage. 5. Store mower in a dry, clean area. Do not store next  1. Clean and lubricate mower thoroughly as described in  to corrosive materials, such as fertilizer. the lubrication instructions.  When storing any type of power equipment in a poorly  2. We do not recommend the use of a pressure washer  ventilated or metal storage shed, car
                    
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                        30 Model Series V550 1 2 54 6 7 3 56 5 68 60 4 67 66 8 65 77 64 61 9 59 74 58 10 22 76 57 11 72 62 71 75 46 12 63 55 45 69 13 53 70 14 52 73 15 42 48 16 17 46 47 44 50 49 43 31 51 46 19 32 42 46 33 29 18 20 34 28 35 20 36 37 27 Wheel Tread 44 38 21 39 23 40 41 25 Zag Tread 24 26 14                                                                                                                                                                                                                          
                    
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                        Ref. Part No. Description Ref. Part No. Description No. No. 1 731-2626 Bail Cover 717-1761 Spur Gear 14T LH 2 747-1161A Blade Control 39 710-04531 Screw 1/4-20 x .39 8 3 746-0957 Control Cable 37.25-inch 40 734-2042 Front Wheel 8 x 2.125 Zag 4 726-0240 Cable Tie 41 731-0981A Hubcap Parts List 5 664-04065 Grass Bag Assembly 42 710-0216 Screw 3/8-16 x .75 6 747-04080 Grass Bag Frame 43 720-0426 Knob 7 746-04206A Variable Speed Cable 44 736-0447 Wave Washer 1.5 x 1 x .029 8 731-05642 Trailshield 45
                    
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                        MANUFACTURER’S LIMITED WARRANTY FOR The limited warranty set forth below is given by MTD LLC with respect e. MTD does not extend any warranty for products sold or  exported  to new merchandise purchased and used in the United States, its outside of the United States, its possessions and territories, except  possessions and territories. those sold through MTD’s authorized channels of export distribution. “MTD” warrants this product against defects in material and workman- f. Replacement parts tha