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Safety • Assembly • Operation • Tips & Techniques • Maintenance • Troubleshooting • Parts Lists • Warranty
OPERATOR’S MANUAL
21” Rotary Mower — Model Series 420
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 applicable local or st
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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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Lubrication • 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. • 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 Maintaining surface of the wheel with light oil. See Figure 5-1. • Lubricate the torsion spring and pivot point on the rear Your Lawn discharge door periodical
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Blade Care WARNING: When removing the cutting blade for sharpening or replacement, protect your hands with a pair of heavy gloves or use a heavy rag to hold the blade. Blade Blade Adapter Maintaining Periodically inspect the blade adapter for cracks, especially if you strike a foreign object. Replace when Bell Your Lawn necessary. Follow the steps below for blade service. Washer Hex Bolt 1. Disconnect spark plug wire from spark plug. Turn Mower mower on its side making sure that the
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Remedy Cause Problem 1. Engage blade control. Engine fails to start 1. Blade control disengaged. 6 2. Connect wire to spark plug. 2. Spark plug wire disconnected. 3. Fuel tank empty or stale fuel. 3. Fill tank with clean, fresh gasoline. 4. Engine not primed (if equipped with 4. Prime engine as instructed in “Operat- primer). ing Your Lawn Mower”. Trouble 5. Clean, adjust gap, or replace. 5. Faulty spark plug. 6. Clean fuel line. 6. Blocked fuel line. Shooting 7. Engine flooded. 7. Wait a few m
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Safety Labels Found On Your Lawn Mower Safety Labels TO REDUCE THE RISK OF INJURY, DO NOT OPERATE UNLESS DISCHARGE COVER OR GRASS CATCHER IS IN ITS PROPER PLACE. IF DAMAGED, REPLACE IMMEDIATELY. MAX 15 ˚ KEEP HANDS and FEET AWAY • DO NOT MOW WHEN CHILDREN OR OTHERS ARE AROUND. AVOID SERIOUS INJURY OR DEATH • USE EXTRA CAUTION ON SLOPES. DO NOT WARNING • KEEP HANDS AND FEET AWAY FROM MOW SLOPES GREATER THAN 15 MOW ˚ ROTATING PARTS. ACROSS, NEVER UP AND DOWN. NEVER PULL MOWER CLOSE TO YOUR
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Ref. Part No. Description Ref. Part No. Description 1 747-1161A Blade Control 24 782-5002B Front Baffle 2 749-1092A Upper Handle 25 748-0377C Blade Adapter, #6 x 2.15 w/Star 8 3 710-1205 Rope Guide 748-04093 Blade Adapter, 25mm x 1.19 4 720-0279 Wing Nut, 1/4-20 26 742-0641 Standard Blade 5 710-1174 Carriage Bolt, 5/16-18 x 2 742-0741† Mulch Blade Parts List 6 720-04072 Hand Star Knob 27 736-0452 Bell Washer 7 749-0928A Lower Handle 28 710-1257 Screw, 3/8-24 x 2.50 (w/ #6 x 8 712-0397 Wing Nut,
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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
