Troy-Bilt 979 Operator's Manual
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Troy-Bilt 979 Operator's Manual

21" self-propelled self starter mower
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OPERATOR'S
MANUAL
21" Self-Propelled
Self Starter Mower
Model Number
979
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 attester 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 engine authorized
service dealer or contact the service department,
P.O. Box 361131 Cleveland, Ohio 44136_0019.
Troy-Bilt LLC, P.O. BOX361131CLEVELAND,0HI0 44136-0019
PRINTED IN U.S.A.
FORM NO. 769-0001g
(2/02)

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Summary of Contents for Troy-Bilt 979

  • Page 1 Federal laws apply on federal lands. A spark arrester for the muffler is available through your nearest engine authorized service dealer or contact the service department, P.O. Box 361131 Cleveland, Ohio 44136_0019. Troy-Bilt LLC, P.O. BOX361131CLEVELAND,0HI0 44136-0019 PRINTED IN U.S.A. FORM NO. 769-0001g...

  • Page 2: Calling Customer Support

    TABLEOFCONTENTS Content Page Important Safe Operation Practices ..............Slope Gauge ...................... Assembling Your Lawn Mower ................Know Your Lawn Mower ..................Operating Your Lawn Mower ................Making Adjustments ..................Maintaining Your Lawn Mower ................Troubleshooting ....................Parts List ......................FINDINGMODELNUMBER This Operator's Manual is an important part of your new lawn mower.

  • Page 3: Section 1: Important Safeoperation Practices

    SECTION 1: IMPORTANT SAFEOPERATION 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.

  • Page 4: Slope Operation

    19.Shut t heengine offand wait u ntil t heblade comes toa doorways, shrubs, trees, or other objects that may complete stop before r emoving thegrass c atcher or obscure your vision of a child who may run into the unclogging thechute.
  • Page 5 3. Check t heblade and engine m ounting bolts atfrequent expose m oving p arts orallow objects tobethrown. For intervals forproper tightness. Also, visually inspect blade safety p rotection, frequently check c omponents fordamage (e.g., bent, cracked, worn) R eplace blade replace immediately with original equipment with the odginal equipment manufacture's...
  • Page 6 SIGHT AND HOLD THIS LEVEL WITH A VERTICAL TREE A POWER POLE A CORNER OF A BUILDING OR A FENCE POST WARNING Do not mow on inclines with a slope in excess of 15 degrees (a dse of approximately 2-1/2 feet every 10 feet). A dding mower could o_o.

  • Page 7: Section 3: Assembling Your Lawnmower

    SECTION 3: ASSEMBLING YOUR LAWNMOWER iMPORTANT: This unit is shipped without gasoline or oil Assembly in the engine. Be certain to service engine with gasoline and oil as instructed in the separate engine manual before operating your mower. NOTE: Reference to right or left hand side of the mower is observed from the operating position.

  • Page 8: Section 4: Knowyour Lawnmower

    NOTE: Make certain the drive cable is routed around the outside and above the lower handle so it does not interfere with attaching the grass bag. The rope guide, which is connected to the support Starter Rope rod, is located on the right side of lower handle. See Figure 5.
  • Page 9 ShiftLever Safety Key Theshiftleveris located onthedriveclutch control The safety key is located on the engine. See Figure 6. housing ontheupper h andle. T hisleveris usedto The safety key is a safety device used to activate and select t heforward speed ofthemower. W henchanging deactivate the self starter system.
  • Page 10 8. Firmly pushprimer b ulb3 times. To StopEngineand Blade 9. While standing atupper handle, d epress thestarter control b utton fullywiththethumb ofyourright hand. for three seconds after the blade control WARNING: The blade witl continue to rotate 10. Using yourlefthand,pull t heblade control h andle lever is released.

  • Page 11: Attaching The Grassbag

    ALWAYS lockandremove safety keyandstore ina Attaching The GrassBag safeplaceuntil n extuse.Thesafetykeyis Remove three wing nuts holding the mulching designed a ndintended toberemoved f romengine baffle or side discharge chute in place and remove when notin use.Removing k eywillprevent from unit. See Figure 8. unsupervised orunexpected starting of mower b y Grass Bag children or unsuspecting adults.

  • Page 12: Emptyingthe Grassbag

    Attach side discharge chute to unit and secure with Emptyingthe GrassBag the three wing nuts. See Figure 10. While holding the grass bag by both the rear handle and the lower handle, lift the grass bag straight up off the adapter. The chute door will move the rope out of the way of the bag.

  • Page 13: Engine Adjustments

    Reassemble theupper handle tothelower handle. The adjustable cable bracket is located on the left side Attach thestarter r opeasinstructed i nthe of the mower beside the engine. See Figure 15. Assembly S ection. Start engine and place speed control lever in the sixth speed position.

  • Page 14: Section 7: Maintaining Your Lawnmower

    SECTION 7: MAINTAINING YOUR LAWNMOWER GeneralRecommendations CustomerResponsibilities MAINTENANCE .qg" _o" SERVICE SC.EDOLE 0ooo DATES Lubricate Wheels Lubricate Blade Control Clean Deck Blade Care £_ Check Oil Change Oil Replace Air Filter Clean Engine Check Spark Plu9 Check Spark Arrester (if any) WARNING: Be sure to disconnect the spark Periodically check all fasteners and make sure...

  • Page 15: Maintenance

    IMPORTANT: We do not recommend the use of a pressure washer or garden hose to clean your unit. Cutting Blade Removal, Replacement, and Sharpening 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.
  • Page 16 Place blade bell support on blade. Make sure the Using a pair of pliers, pull back and rotate belt notches on the blade belt support are aligned with keeper bracket from the slot on the idler pulley. small holes in the blade. Slide the belt out from between the belt keeper Replace hex bolt and tighten to torque: 450 in.
  • Page 17 Pinch both sides of the belt together so that the belt is not in the pulley groove, and the lower pulley can Six-Speed be pushed towards the engine. See Figure 23. Cable Slot Belt Control Lower Pulley © Belt Lower Pulley Figure 23 haft...

  • Page 18: Section 8: Storing Your Lawnmower

    SECTION 8: STORING YOUR LAWNMOWER The following steps should be taken to prepare your Clean and lubricate mower thoroughly as described in the lubrication instructions. lawn mower for storage. IMPORTANT:We do not recommend the use of a WARNING: Be sure to disconnect the spark pressure washer or garden hose to clean your unit.

  • Page 19: Section9: Troubleshooting

    SECTION9: TROUBLESHOOTING Problem Cause Remedy Engine fails to start Blade control handle disengaged. Engage blade control handle. Start control button not depressed. Depress starter control button Spark plug wire disconnected. Connect wire to spark plug. Safety key not in run position Place safety key in run position.
  • Page 20 Model979...
  • Page 21 Model979 Ref. Ref. Part No. Part No. Part Description Part Description 10622B 647-0070 Control Handle Plastic Spring Ratchet 748-0381 Pawl RH 731-2623 Bail Cover (Not shown) 748-0188B Pawl LH 731-0904A Upper Control Handle 16864 738-0137A Shld Screw ,340 ID x ,285 OD 6 Spd.
  • Page 22 Model979 57_4_ '...
  • Page 23 Model979 Ref. Ref. Part No. Pa_ No. Part Description Part Description 782-7598 720-0223 Belt Keeper Grip 741-0600 732-0803A Bearing Spring Lever 738-0529 732-0849A Shoulder Nut ,825 x ,165 Lg. Extension Spring 750-1050 710-0751 Flange Spacer Cap Screw 1/4-20 x .620 736-0270 Bell Washer .285 ID x .75 OD 682-0027A...
  • Page 24 FOR: _qllllIF IIMIImllMIImlr The limited warranty set forth below is given by Troy-Bilt LLC Troy-Bilt LLC does not extend any warranty for with respect to new merchandise purchased and used in the products sold or exported outside of the United States, United States, its possessions and territories.

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