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Operator's Manual
21" Self-Propelled
Lawn Mower
Model 378Q
\
IMPORTANT:
Read safety rules and instructions
carefully
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 effective working order by the operator. In the State of California the
above is required by law (Section 4442 of the California Public Resources Code). Other states may have similar laws. Federal laws apply
on federal lands. A spark arrester for the muffler is available through your nearest authorized engine service dealer or contact the service
department,
P.O. Box 361131 Cleveland, Ohio 44136-0019.
MTD PRODUCTS LLC.,P.O.Box361131, C leveland,Ohio44136-0019
PRINTED IN U.S.A.
FORM NO. 769-01116A
(3/2004)
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Summary of Contents for MTD 378Q
- Page 1 A spark arrester for the muffler is available through your nearest authorized engine service dealer or contact the service department, P.O. Box 361131 Cleveland, Ohio 44136-0019. MTD PRODUCTS LLC.,P.O.Box361131, C leveland,Ohio44136-0019 PRINTED IN U.S.A. FORM NO. 769-01116A...
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Page 2: Table Of Contents
TABLEOFCONTENTS Content Page Content Page Important SafeOperation P ractices Making Adjustments Slope Gauge Maintaining Your Lawn Mower Assembling YourLawn Mower Troubleshooting Know YourLawn Mower Illustrated Parts List Operating Y ourLawn Mower Warranty FINDINGMODELNUMBER 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. -
Page 3: Important Safeoperation P Ractices
SECTION 1: IMPORTANT SAFEOPERATION P RACTICES 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. -
Page 4: Slope Gauge
unclogging thechute. The cutting b lade continues to Keep children away from hot or running engines. They rotate f orafew seconds after t heengine i sshut o ff. can suffer burns from a hot muffler. Never place a nypart o fthebody intheblade area until Never allow children under 14 years old to operate a you aresure theblade has stopped r otating. - Page 5 3. Check t heblade and engine m ounting bolts atfrequent replace i mmediately with original equipment intervals forproper tightness. Also, visually inspect blade manufacturer's (O.E.M.) parts only, l isted inthismanual. fordamage (e.g., b ent, cracked, worn) R eplace blade "Use ofparts which d onotmeet theoriginal equipment withthe original equipment manufacture's (O.E.M.) blade specifications...
- Page 6 II 91 SIGHT AND HOLD THIS LEVEL WITH A VERTICAL TREE A POWER POLE A CORNER OF A BUILDING -. ,. OR A FENCE POST " .. ,_ III! ~ ~ ~FQLDo^. .._"- I::l 15 ° WARNING cu 05 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.
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Page 7: Assembling Yourlawn Mower
SECTION 3: ASSEMBLING YOUR LAWNMOWER Removing UnitFromCarton Tighten these wing nuts • Remove staples, break glue on top flaps, or cut tape at carton end and peel along top flap to open. • Remove loose parts if included with unit (i.e., operator's manual, grass bag etc.) •... -
Page 8: Know Yourlawn Mower
• Loosen the wing nut holding the rope guide to the Upper Handle upper handle. See Figure 6. Starter Rope • Squeeze the blade control handle against the upper handle and pull starter rope out slowly. • Thread the recoil starter rope into the rope guide and tighten the wing nut. - Page 9 SECTION 5: OPERATING Y OUR LAWNMOWER NOTE: For shipping purposes your mower is set with WARNING: Be sure no one other than the the wheels in a low cutting height position. For best operator is standing near the lawn mower while results raise the cutting position until it is determined starting engine or operating mower.
- Page 10 Fora healthier l awn,never c utoffmorethanone- Attaching GrassBag thirdofthetotallength ofthegrass. Y ourlawn • Lift the rear discharge door and remove the should becutinthefallaslongasthereis growth. mulching plug, if installed. Thismower i sdesigned t obeoperated atfull • Lift the rear discharge door and hang the grass bag throttle togiveyouthebestcutanddothemost on the mower.
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Page 11: Making Adjustments
SECTION 6: MAKING ADJUSTMENTS Reassemble the upper handle to the lower handle. Attach the starter rope as instructed in the adjustments without first stopping engine and WARNING: Do not at any time make any Assembly Section. disconnecting spark plug wire. Cutting Height •... -
Page 12: Maintaining Your Lawn Mower
SECTION 7: MAINTAINING YOUR LAWNMOWER General R ecommendations Cleaning the Deck • Always observe safety rules when performing any IMPORTANT:We do not recommend the use of a maintenance. pressure washer or garden hose to clean your unit. • The warranty on this lawn mower does not cover Clean the underside of the mower deck after each items that have been subjected to operator abuse use to prevent a build-up of grass clippings, leaves,... - Page 13 • Test the blade by balancing it on a round shaft • Tip the mower back on its handle and block screwdriver. Remove metal from the heavy side securely. until it balances evenly. It is recommended that the • Remove the blade, blade adapter and related blade always be removed from the adapter when hardware.
- Page 14 wayfortheselfpropelled mechanism towork. • Clean and lubricate mower thoroughly as described Check theinstallation o fthegearbyspinning the in the lubrication instructions. wheel. I t should spinfreelyinonedirection butnot • Follow the engine manual for engine storage. theother. I f thewheel s pinsfreelyinboth •...
- Page 15 SECTION 9: PARTS LISTFORMODEL 378 R\\\\\\\\\ R\\\\ 26 7 Ref. No. Part No. Pa_ No. Description Ref. No. Description 638-0005 750-0807 Rear Axle Assembly Spacer 682-7518 750-1056 Trans axle Assembly Shoulder Spacer 682-7524 750-1075 Chain Cover Assembly Slev Spacer 748-0381 Pawt RH 782-0566B Pivot Arm...
- Page 16 Model378 35 36...
- Page 17 Model378Q Ref. Ref. Pa_No. Pa_ No. Description Description 710-1667 Hi-Lo Screw 731-1714A Belt Cover 731-1058 736-3020 Flat Washer Control Housing: Lower 731-0620 Drive Control Lever 736-0329 Lock Washer 731-1057 712-0287 Hex Nut 1/4-20 Control Housing: Upper 731-1059 710-0351 B Screw #10-16 x 0.5" Mounting Cap: SP Cable 710-1205 712-0400...
- Page 18 Model378 _\\\\ \\\\...
- Page 19 Model378 Ref. Part No. Description 712-3025 Hex Jam Nut 5/16-24 736-0425 Bell Washer 756-0656 Pulley 736-3084 Flat washer 712-0896 Hex Jam Nut 782-7598 Belt Keeper 741-0124 Bearing 7501050 Flange Spacer 682-0027A Idler Bracket Assembly 710-0299 Hex Cap Screw 732-0849A Torsion Spring 741-0682A Bearing Sleeve 736-0570...
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Page 20: Warranty
MANUFACTURER'S LIMITED WARRANTY FOR: The limited warranty set forth below is given by MTD LLC with MTD does not extend any warranty for products sold or respect to new merchandise purchased and used in the exported outside of the United States, its possessions United States, its possessions and territories.