MTD 420 cc Operator's Manual

Ohv vertical shaft engine

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Operator's manual (44 pages)

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Page 1 READ AND FOLLOW ALL SAFETY RULES AND INSTRUCTIONS IN THIS MANUAL BEFORE ATTEMPTING TO OPERATE THIS MACHINE. FAILURE TO COMPLY WITH THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY. MTD Products Ltd., P. O. Box 1386, KITCHENER, ONTARIO N2G 4J1 Printed In USA 769-09539...
Page 2: Table Of Contents
To The Owner Thank You This Operator’s Manual is an important part of your new engine. It will help you prepare and maintain the engine for the best performance. Please read and understand the contents before operating the engine. Table of Contents Safe Operation Practices ........
Page 3: Safe Operation Practices
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 the equipment. Failure to comply with these instructions may result in personal injury.
Page 4: Spark Arrestor
Maintenance & Storage Do not overfill fuel tank. Fill tank to full as indicated by the fuel level indicator installed inside of the fuel tank. Do not Keep the engine in safe working order over-fill to allow space for fuel expansion. On some models, a fuel level indicator may NOT be present, in this instance, Allow the engine to cool at least five minutes before fill the tank no more than 1/2 inch below the bottom of the...
Page 5: Safety Symbols
Safety Symbols This page depicts and describes safety symbols that may appear on this product. Read, understand, and follow all instructions on the machine before attempting to assemble and operate. Symbol Description READ THE OPERATOR’S MANUAL(S) Read, understand, and follow all instructions in the manual(s) before attempting to assemble and operate WARNING—GASOLINE IS FLAMMABLE Allow the engine to cool at least two minutes before refueling.
Page 6: Set-Up
Set-Up Gas & Oil Checking Oil Level NOTE: Be sure to check the oil while on a level surface with the NOTE: The engine is shipped without gasoline and with motor engine stopped. oil in the engine. However, you MUST check the oil level before operating.
Page 7 Fuel Requirements Adding Fuel WARNING! CAUTION: An adult should fuel this engine. Operating the engine with E15 or E85 NEVER allow children to refuel the engine. Gasoline fuel, an oil/gasoline mixture, dirty gasoline, or (fuel) vapors are highly flammable and can explode. gasoline over 30 days old without fuel stabilizing Fuel vapors can spread and be ignited by a spark or additive may result in damage to your engine’s...
Page 8: Controls & Features
Controls and Features Air Cleaner Finger Guard Oil Fill Cap Electric Starter Spark Plug Oil Drain Muffler Fuel Filter Carburetor Oil Filter Figure 4-1 Throttle/Choke Control Oil Fill Cap Remove the oil fill cap to check the oil level and add oil. The throttle/choke control is located on the mower and is used to aid in starting/stopping the engine and adjusting engine speeds.
Page 9: Operation
Operation Pre-Operation Check The engine is shipped without gasoline and with oil in the Position engine. See the Set-Up Section of this manual for instructions on adding gasoline and checking oil. Stop Start Position Starting the Engine Position Release all controls on the mower. Move the gear shift lever into the neutral (N) position.
Page 10: Engine Maintenance
Engine Maintenance WARNING: Periodic inspection and adjustment of the engine is essential Shut off the engine before performing if high level performance is to be maintained. Regular any maintenance. To prevent accidental start-up, maintenance will also ensure a long service life. The required disconnect the spark plug boot.
Page 11 Oil Service Replace Oil Filter This engine is equipped with a spin-on oil filter that should be • Check oil level regularly. replaced each time an oil change is performed, every season or • Be sure correct oil level is maintained. Check every five 50 hours.
Page 12: Air Filter Service
Add Oil Unscrew the thumb screws and remove the air filter cover. See Figure 6-4. IMPORTANT: Be sure to check engine on a level surface with the engine stopped. Wipe around dipstick cap and tube with a clean cloth to remove any debris.
Page 13 Remove the foam pre-filter from around the paper air Attach the air filter cover, making sure to align plastic rib filter. See Figure 6-6. Replace paper element when dirty or features on the shroud to the plastic features on the air damaged.
Page 14 Fuel Filter Service WARNING: If the engine has been running, the muffler will be very hot. Be careful not to touch the The fuel filter cannot be cleaned and should be replaced every muffler. 100 operating hours; more often if run with old gasoline. Remove all fuel from tank by running engine until it stops Visually inspect the spark plug.
Page 15 Clean Engine Change oil. See Oil Change section. Remove spark plug and pour about 1/2 an ounce of engine If the engine has been running, allow it to cool for at least half oil into cylinder. Replace spark plug and crank slowly to an hour before cleaning.
Page 16: Troubleshooting
Troubleshooting Problem Cause Remedy Engine Fails to start 1. Blade control disengaged. 1. Engage blade control. 2. Spark plug boot disconnected. 2. Connect wire to spark boot. 3. Fuel tank empty or stale fuel. 3. Fill tank with clean, fresh gasoline. 4.
Page 17: Replacement Parts
Replacement Parts Component Part Number and Description 951-10292 Spark Plug 751-12260 Air Cleaner 751-12256 Pre-Cleaner 951-3013 Fuel Filter 751-11501 Oil Filter NOTE: Download a complete Parts Manual, refer to customer support on page 2. Be sure to have your model number and serial number ready.
Page 18: Warranty
Any warranted part that is not scheduled for replacement as required maintenance in the written instructions supplied is warranted for the warranty period stated above. If the part fails during the period of warranty coverage, the part will be repaired or replaced by MTD Consumer Group Inc according to subsection (4) below.
Page 19 NOTE: If you require warranty service in Canada and your product was sold by MTD Products Limited within Canada to the retailer you purchased it from in Canada then the MTD Consumer Group Inc portion of this warranty will be honored by MTD Products Limited in Canada.
Page 20 Notes...

MTD 420 cc Operator's Manual

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