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Operator’s Manual
21” Rear & Side Discharge
Mulching Lawn Mower
Model 437
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 i
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TABLE OF CONTENTS Content Page Important Safe Operation Practices ...................................................................... 3 Slope Gauge ......................................................................................................... 6 Assembling Your Lawn Mower .............................................................................. 7 Know Your Lawn Mower........................................................................................ 9 Operating Your Lawn Mo
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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: This machine was built to be operated according to the rules for safe oper
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8. Never operate the mower in wet grass. Always be Do Not: sure of your footing. A slip and fall can cause 1. Do not mow near drop-offs, ditches or serious personal injury. If you feel you are losing embankments, you could lose your footing or your footing, release the blade control handle balance. immediately and the blade will stop rotating within 2. Do not mow slopes greater than 15 degrees as three seconds. shown on the slope gauge. 9. Mow in daylight or good artificial light. Walk,
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7. Extinguish all cigarettes, cigars, pipes and other lead to improper performance and compromise sources of ignition. safety!” 8. Never fuel machine indoors because flammable 4. Mower blades are sharp and can cut. Wrap the vapors will accumulate in the area. blade or wear gloves, and use extra caution when 9. Never remove gas cap or add fuel while the engine servicing them. is hot or running. Allow engine to cool at least two 5. Keep all nuts, bolts, and screws tight to be sure the minutes
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FOLD ON DOTTED LINE, REPRESENTING A 15° SLOPE USE THIS PAGE AS A GUIDE TO DETERMINE SLOPES WHERE YOU MAY NOT OPERATE SAFELY. SIGHT AND HOLD THIS LEVEL WITH A VERTICAL TREE A POWER POLE A CORNER OF A BUILDING OR A FENCE POST 15° 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). A riding mower could overturn and cause serious injury. If operating a walk-behind mower on such a slope, it is extremely difficult to maintain your f
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SECTION 3: ASSEMBLING YOUR LAWN MOWER Removing Unit From Carton Remove staples, break glue on top flaps or cut tape at carton end and peel top flap to open carton. Remove loose parts if included with unit. Cut corners and lay carton down flat. Remove packing material. Roll or slide unit out of carton. Check carton thoroughly for loose parts. NOTE: Make sure not to crimp cables while removing the loose parts or the entire unit from the carton. Hardware Pack Figure 2 Please identify ea
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Assembling Grass Catcher NOTE: If your mower’s grass catcher has been already Carriage Bolt assembled before shipping, proceed to the next section. If it is unassembled, follow the steps below. Insert frame into grass bag with the black plastic Upper side on the bottom of bag. See Figure 7. Hole Insert frame Handle into bag Mounting Brkt. Wing Nut Move Hairpin Clip Grass Catcher Frame Grass Figure 4 Bag Fasten the cable to the lower handle with the two cable ties found on the lower hand
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Removing Grass Catcher Lift the rear discharge door on the mower, and lift Mulching the grass catcher up. Plug Release the rear discharge door. Converting to Side-Discharge Your mower has been shipped as a mulcher. To Hinge convert it to a side-discharge mower, lift the Pin mulching plug. Slide the two hooks on the side- discharge deflector under the hinge pin on the mulching plug assembly. Lower the mulching plug. Side Chute See Figure 10 . Deflector Figure 10 Do not remove the side
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Cutting Height Adjustment Lever Primer This lever, located at each wheel, lets you adjust cutting The primer is used to pump gas into the carburetor. Use height of the grass. Remember to put all four levers at it to assist in starting a cold engine, but do not use it when restarting a warm engine after a short shutdown. the same height to avoid uneven cut. Mulching Plug Throttle Control The engine is equipped with a constant speed throttle The mulching plug is used only for mulching purposes
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Operating Your Lawn Mower Bagging Grass Clippings Once the engine has started, squeeze the blade You can use the grass catcher bag to collect clippings control handle against the upper handle to run the while you are operating the mower. lawn mower. Attach the grass catcher following instructions on Do not operate the mower without the mulching page 8 of this manual. Grass clippings will cover, the grass catcher bag, or the discharge automatically collect in the bag as you run mower
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SECTION 6: MAINTAINING YOUR LAWN MOWER IMPORTANT: Make sure to avoid muffler and WARNING: Always stop engine and surrounding areas while the mower engine is hot disconnect spark plug wire before performing because temperature of these areas of the engine may o any maintenance or adjustments on the mower. exceed 150 F. WARNING: Never tip mower more than 90 Lubrication (See Figure 12 ) degrees in any direction and do not leave it tipped for long. Oil can drain into the upper part Wheels of
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SECTION 7: SERVICING YOUR MOWER NOTE: An unbalanced blade will cause excessive Blade Care vibration when rotating at high speeds, may cause Periodically inspect the blade adapter and pulley for damage to the mower and could break causing cracks, especially if you strike a foreign object. Replace personal injury. when necessary. The blade can be tested by balancing it on a round WARNING: When removing the cutting shaft screwdriver. See Figure 14. Remove metal blade for sharpening or rep
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Attach the new flap and new rod to deck, bending Replacing Rear Flap the ends of the new rod over to secure to deck. To remove rear flap, cut off the flat end of the wire rod which secures it to the deck. See Figure 15 . Rear Discharge Door Handle Bracket Handle Bracket Rear Flap Figure 15 SECTION 8: MAKING ADJUSTMENTS Adjusting Handle Height Adjusting Cutting Height Your mower is shipped with the handle in the higher IMPORTANT: All wheels must be placed in the same height position.
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SECTION 9: OFF-SEASON STORAGE Prepare your lawn mower for storage at the end of the Store unit in a clean, dry area. Do not store next to season or if the unit will not be used for 30 days or corrosive materials, such as fertilizer or rocksalt. more. Store the mower in a clean, dry area. Clean underside of the mower according to instructions on page 12. Gasoline Do not store gasoline from one season to another. NOTE: The use of a pressure washer or garden hose to Gasoline, stored more
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SECTION 11: PARTS LIST FOR MODEL 437 1 6 10 3 2 4 8 57 5 11 54 4 44 7 42 12 9 15 38 55 53 14 12 25 13 37 43 18 56 39 19 41 31 32 35 52 33 30 48 44 49 44 29 45 40 16 28 50 25 23 17 51 36 26 27 24 29 20 30 25 34 44 31 47 46 22 21 16
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Model 437 Ref. Ref. Part No. Description Part No. Description No. No. 1. 747-1161A Control Handle 31. 738-0102 Front Axle Bolt 2. 710-1205 Rope Guide 32. 720-0426 Spring Lever Knob 3. 720-0279 Handle Knob 1/4-20 Thd. 33. 732-0417A Rear Spring Lever 4. 710-1174 Curved Hd. Bolt 5/16-18 x 2" 34. 14578 Height Adj. Assy. Comp. - RH 5. 720-0284 Hand Knob 14579 Height Adj. Assy. Comp. - LH 6. 749-1092A Upper Handle 35. 14765 Pivot Bar R.H. 7. 749-0928A Lower Handle 14766 Pivot Bar L.H. 8. 726-024
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MANUFACTURER’S LIMITED WARRANTY FOR: The limited warranty set forth below is given by MTD LLC with d. MTD LLC does not extend any warranty for products respect to new merchandise purchased and used in the sold or exported outside of the United States, its United States, its possessions and territories. possessions and territories, except those sold through MTD LLC’s authorized channels of export distribution. MTD LLC warrants this product against defects for a period of e. Parts that are not
