Yard-Man 247.37979 Operator's Manual
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Yard-Man 247.37979 Operator's Manual

Yard-Man 247.37979 Operator's Manual

21” self-propelled mower
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Operator's Manual
21" Self-Propelled
Mower
Model No.
247.379790
Factory No.
12A-979L402
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 engine authorized
service dealer or contact the service department, P.O. Box 368022 Cleveland, Ohio 44136-9722.
MTD PRODUCTS INC. P.O. BOX 368022 CLEVELAND, OHIO 44136-9722
PRINTED IN U.S.A.
FORM NO. 770-10214
(12/98)

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  • Page 1 Operator’s Manual 21” Self-Propelled Mower Model No. 247.379790 Factory No. 12A-979L402 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).

  • Page 2: Section 1: Finding Your Model Number

    SECTION 1: FINDING YOUR MODEL NUMBER This Operator’s Manual is an important part of your new walk behind. It will help you assemble, prepare and maintain your walk behind. Please read and understand what it says. Before you start to prepare your walk behind for its first use, please locate the model plate and copy the information from it in this Operator’s Manual.

  • Page 3: Section 3: Slope Gauge

    SECTION 3: SLOPE GAUGE...

  • Page 4: Section 4: Important Safe Operation Practices

    SECTION 4: 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 YOUR LAWN MOWER. FAILURE TO COMPLY WITH THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.

  • Page 5: Slope Operation

    • Never operate the mower in wet grass. Always be sure of your footing. A slip and fall can cause serious personal injury. Keep a firm hold on the handle and walk, never run. If you feel you are losing your footing, RELEASE THE BLADE CONTROL HANDLE IMMEDIATLEY and the blade will stop rotating within three seconds.
  • Page 6 • Never tamper with safety devices. Check their proper operation regularly. • After striking a foreign object, stop the engine, remove the wire from the spark plug, and thoroughly inspect the mower for any damage. Repair the damage before starting and operating the mower. •...

  • Page 7: Section 5: Unpacking Instructions

    SECTION 5: UNPACKING INSTRUCTIONS REMOVE UNIT FROM CARTON (See Figure 3.) • Remove staples, break glue on top flaps, or cut tape at carton end and peel along top flap to open carton. • Remove loose parts if included with unit (i.e., operator’s manual, etc.). •...

  • Page 8: Section 6: Set-Up Instructions

    SECTION 6: SET-UP INSTRUCTIONS ITEMS REQUIRED FOR ASSEMBLY • Pair of Pliers (Not necessary, but helpful) • Motor Oil (Included) • Fresh Gasoline IMPORTANT: This unit is shipped WITHOUT GASOLINE or OIL in the engine. Be certain to service engine with gasoline and oil as instructed in the separate engine manual before operating your mower.
  • Page 9 Step 5. Pinch lower handle against mounting bracket with pliers. Step 6. Move hairpin clip from outer to inner hole on left and right handle mounting brackets. Inner Hole Pinch Here Step 8. Squeeze the blade control handle against the upper handle and pull out the starter rope slowly. Step 9.

  • Page 10: Section 7: Controls

    SECTION 7: CONTROLS Blade Control Handle Throttle Control Recoil Starter BLADE CONTROL HANDLE The blade control handle is located on the upper handle of the mower. See Figure 5. The blade control handle must be depressed in order to start and operate the unit. Release the blade control handle to stop the engine and blade.

  • Page 11: Section 8: Operation

    CUTTING HEIGHT ADJUSTMENT LEVER Note: Your mower is shipped with the cutting height in the lowest position. Adjust the cutting height as follows. The cutting height adjustment lever is located above the left rear wheel. To adjust the cutting height, pull the lever out and away from the mower and then move it forward or backward to select a new cutting height.
  • Page 12 NEUTRAL ADJUSTMENT TEST To perform the NEUTRAL ADJUSTMENT TEST answer the following questions. • With the drive clutch control released, push mower forward and pull it backward. Does it move freely? • Squeeze the drive clutch control and pull the mower backward. Do the rear wheels lock (not turn)? •...
  • Page 13 BAGGING GRASS CLIPPINGS This mower can bag grass clippings. Follow steps 1 through 3 to ready the mower for bagging. Step 1. Remove wing nuts holding mulching baffle or side discharge chute in place. Then remove plug or discharge chute. Step 3.
  • Page 14 EMPTYING YOUR GRASS BAG Holding the grass bag by both the rear handle and the lower handle, lift it straight up. The chute door will move the rope out of the way of the bag. Remove the bag from the bagging adaptor on the mower. While holding the lower handle lift up the rear section of the grass bag as shown in Figure 7.

  • Page 15: Section 9: Adjustments

    SECTION 9: ADJUSTMENTS WARNING: Do not at any time make any adjustment to lawn mower without first stopping engine and disconnecting spark plug wire. HANDLE HEIGHT ADJUSTMENT Your mower is shipped with the handle in the higher height position. To lower the height proceed as follows: •...
  • Page 16 Note: For some people the drive clutch handle may not be in a comfortable position. You can adjust the handle out by tightening the adjustment wheel. SHIFT LEVER CABLE ADJUSTMENT Periodic adjustment of the six speed shift cable may be required due to normal wear on the cable. Adjustment is needed if all six speeds do not work.

  • Page 17: Section 10: Maintenance

    SECTION 10: MAINTENANCE WARNING: Be sure to disconnect and ground the spark plug wire before performing any repairs or maintenance. NOTE: When tipping the unit, empty the fuel tank and keep the engine spark plug side up. Never tip the mower more than 90 degrees and do not leave the mower tipped for any length of time.
  • Page 18 WARNING: Periodically inspect the blade adapter for cracks, especially if you strike a foreign object. Replace when necessary. When sharpening the blade, follow the original angle of grind as a guide. It is extremely important that each cutting edge receives an equal amount of grinding to prevent an unbalanced blade. An unbalanced blade will cause excessive vibration when rotating at high speeds.
  • Page 19 DRIVE BELT REMOVAL AND REPLACEMENT Step 1. Disconnect the spark plug wire and ground it against the engine. Step 2. Drain the fuel tank or place a piece of plastic beneath the cap to prevent gasoline leakage. Step 3. Place shift lever in the first position. Step 4.
  • Page 20 Step 13. Squeeze the belt together and push it forward. Press the control arm inward towards the deck and remove the six speed cable from the slot. Six-Speed Belt Cable Slot Control Step 14. Pivot the control arm down away from the pulley and belt.

  • Page 21: Section 11: Lubrication

    Step 21. Pinch both sides of the belt together so that the belt is not in the pulley groove, and the lower pulley can be pushed towards the engine. Lower Pulley Half Step 24. Reinstall the bolt securing transmission to rear mower housing. Step 25.

  • Page 22: Section 12: Off-Season Storage

    Blade Control: Lubricate the pivot points on the blade control handle and the brake cable at least once a season with light oil. See Figure 11. The blade control must operate freely in both directions. Wheels: Lubricate the wheels at least once a season with light oil (or engine oil). Also, if the wheels are removed for any reason, lubricate the surface of the axle bolt and the inner surface of the wheel with light oil.

  • Page 23: Section 13: Trouble Shooting Guide

    SECTION 13: TROUBLE SHOOTING GUIDE Trouble Engine fails to start Engine runs erratic Engine overheats Occasional skip (hesitates) at high speed Idles poorly Excessive vibration Mower will not mulch grass Uneven cut Refer to separate engine manual packed with your mower for more engine related information. NOTE: For repairs beyond the minor adjustments listed above, contact your nearest authorized service dealer or call 1-800-800-7310 for the Customer Support Center.
  • Page 24 Model 979...
  • Page 25 Model 979 Ref. Part No. 710-0134 Scr. Carr. 1/4-20 x .62 710-0654A Scr. TT:3/8-18:1.00 710-0703 Scr. 1/4-20 x .750 712-0397 Wing Nut 1/4-20 723-0233 Nut, Push .25 I.D. x .50 O.D. 736-0204 Wash. Fl. .334 I.D.x .62 x.03 782-0046A-0665 Deck - 21” 710-0653 Scr.
  • Page 26 Model 979...
  • Page 27 Model 979 Ref. Part No. Code 710-1174 Bolt Cur. Carr. 5/16-18 x 2.0 714-0104 Cotter Pin .072 x 1.12 Lg. 720-0241 Knob Ass’y Wingnut 5/16-18 726-0240 Strap 4.3 Lg. 736-0451 Wash. Sad. .320 ID x.830 OD 712-0429 Hex Nut 5/16 710-1270 Oval C-Sunk Screw 712-0324...
  • Page 28 Model 979 Ref. Part No. Code 746-0939 6 Spd. Cable 656-0613 Pulley Ass’y Multi- Spd. 710-0167 Scr. 1/4-20 x .50 Carr. 710-0896 Scr. AB 1/4-14 x .625 Hxinwsh 711-1114 Pivot Shaft 712-0287 Nut 1/4-20 732-0807 Torsion Spring LH 736-0270 Bell Wash. .265 X .75 X .062 736-0329 Lock Wash.
  • Page 29 Model 979 Ref. Part No. 712-3025 736-0425 756-0656 736-3084 712-0896 782-7598 741-0600 750-1050 682-0027A 710-0299 732-0849A 741-0682A 736-0570 721-0329 618-0253 736-0616 717-1487 736-0314 736-0569 618-0252 710-0642 782-7601A 741-0674 611-0066 721-0325 717-1469 711-1168 741-0672 721-0329 782-7595 741-0324 736-0369 741-0690 Code Description Hx.
  • Page 31 MANUFACTURER’S LIMITED WARRANTY FOR: For TWO YEARS from the date of retail purchase within the United States of America, its possessions and territories, MTD Products will, at its option, repair or replace, for the original purchaser, free of charge, any part or parts found to be defective in material or workmanship.

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247.379790

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