Cub Cadet S621 SS Operator's Manual
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Cub Cadet S621 SS Operator's Manual

21” swiftstart self-propelled mower
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Operator's Manual
21" SwiftStart™
Self-Propelled
Mower
Model S621 SS
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 368023 Cleveland, Ohio 44136-9722.
CUB CADET CORP. P.O. BOX 368023 CLEVELAND, OHIO 44136-9722
FORM NO. 770-10495.fm
PRINTED IN U.S.A.
(1/2001)

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Summary of Contents for Cub Cadet S621 SS

  • 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 368023 Cleveland, Ohio 44136-9722. CUB CADET CORP. P.O. BOX 368023 CLEVELAND, OHIO 44136-9722 FORM NO. 770-10495.fm PRINTED IN U.S.A.

  • Page 2: Table Of Contents

    Customer Dealer Referral Line at 1-(800)-528-1009. Please have your unit’s model number and serial number ready when you call. See previous section to locate this information. By having the model and serial numbers ready, you help your Cub Cadet dealer give you faster service.

  • Page 3: Important Safe Operation Practices

    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.
  • Page 4 20. Never operate mower without proper trail shield, Keep children away from hot or running engines. They discharge cover, grass catcher, blade control handle or can suffer burns from a hot muffler. other safety protective devices in place and working. Never allow children under 14 years old to operate a Never operate mower with damaged safety devices.
  • Page 5 Check the blade and engine mounting bolts at frequent shield are subject to wear and damage which could intervals for proper tightness. Also, visually inspect blade expose moving parts or allow objects to be thrown. for damage (e.g., bent, cracked, worn) Replace blade For safety protection, frequently check components and with the original equipment manufacture’s (O.E.M.) blade replace immediately with original equipment...

  • Page 6: Slope Gauge

    SECTION 2: SLOPE GAUGE Use this page as a guide to determine slopes where you may not operate safely. Do not operate your lawn mower on such slopes.

  • Page 7: Assembling Your Lawn Mower

    SECTION 3: ASSEMBLING YOUR LAWN MOWER Removing Unit From Carton NOTE: Your mower is shipped with the handle in the higher height position. If you wish to lower the height of • Remove staples, break glue on top flaps, or cute the handle, refer to the Adjustment Section at this time.
  • Page 8 • Remove wing nuts holding the mulching baffle or side discharge chute in place and remove from unit. • Replace with grass bag adapter, while making sure Cable Tie the inner lip of attachment goes under the edge of the deck. Secure with the wing nuts previously removed.

  • Page 9: Know Your Lawn Mower

    SECTION 4: KNOW YOUR LAWN MOWER WARNING: Be familiar with the location and operation of all controls on the mower. Know how to stop the machine and disengage these controls quickly. Grass Bag Drive Clutch SwiftStart™ Control Cutting Height Adjustment Lever Shift Lever Control Handle...

  • Page 10: Operating Your Lawn Mower

    SECTION 5: OPERATING YOUR LAWN MOWER Before Starting the upper handle, depress the starter control button fully with your right thumb. 10. Using your left hand, pull the blade control handle WARNING: Read, understand, and follow all the way toward the upper handle. all instructions and warnings on the machine 11.
  • Page 11 To Stop Engine and Blade designed and intended to be removed from engine when not in use. Removing key will prevent unsupervised or unexpected starting of mower by WARNING: The blade will continue to children or unsuspecting adults. The safety key rotate for three seconds after the blade must be in the locked position before it can be control lever is released.

  • Page 12: Making Adjustments

    Emptying Grass Bag • While holding the grass bag by both the rear handle and the lower handle, lift the grass bag from the adapter. The chute door will move the rope out of the way of the bag. • Continue to hold the lower handle and raise the rear of the grass bag up toward your chest.

  • Page 13: Maintaining Your Lawn Mower

    tighten or loosen the drive belt. You will have to adjust • Start engine and place speed control lever in the the drive clutch control if any of the following happens: sixth speed position. See Figure 15. • The mower does not propel itself with the drive clutch engaged.

  • Page 14: Cutting Deck

    Blade Replacement & Sharpening WARNING: When removing the cutting Lubricate blade for sharpening or replacement, protect your hands by using heavy gloves or a rag to grasp the cutting blade. • Remove the bolt and the blade bell support which hold the blade and the blade adapter to the engine crankshaft.
  • Page 15 • Replace hex bolt and tighten hex bolt to torque: 450 • Tilt the transmission forward and loosen the idler in. lbs. min., 600 in. lbs. max. pulley bolt and lock nut half a turn. See Figure 21. • Using a pair of pliers, pull back and rotate belt NOTE: To ensure safe operation of your mower, the keeper bracket from the slot on the idler pulley.

  • Page 16: Off Season Storage

    • Place the new belt over the transmission pulley. • Pivot the control arm back to its original position Start the belt in the pulley groove and rotate the and reinstall the six-speed cable into the slot. See pulley until the belt is seated in transmission pulley. Figure 24.

  • Page 17: Troubleshooting

    Dull blade. Sharpen or replace blade. Uneven cut Wheels not positioned correctly. Place all four wheels in same height position. Dull blade. Sharpen or replace blade. NOTE: For repairs beyond the minor adjustments listed above, contact your nearest Cub Cadet dealer.

  • Page 18: Parts List

    SECTION 10: PARTS LIST FOR MODEL S621 SS Transmission and Pulley for reference only 12 47 Pulley Assembly for reference only IMPORTANT: For a proper working machine, use Factory Approved Parts. V-BELTS are specially designed to en- gage and disengage safely. A substitute (non OEM) V-Belt can be dangerous by not disengaging completely.
  • Page 19 Model S621 SS Ref. Ref. Part No. Part Description Part No. Part Description 710-0134 Carriage Screw 1/4-20 x .62 611-0064 Front Axle Assembly 710-0654A TT Screw 3/8-18:1.00 710-1241 Hx Scr. Wash Hd. Hi.-Lo. 710-0703 Screw 1/4-20 x .750 710-1242 Scr. Torx, Truss Hi.-Lo.
  • Page 20 Model S621 SS Ref. Ref. Part No. Part Description Part No. Part Description 16864 6-Speed Rack Cable Brkt. 710-1174 Bolt Cur. Carr. 5/16-18 x 2.0 714-0104 Cotter Pin .072 x 1.12 Lg. 731-0905A Lower Control Housing 731-0906 Cable Mounting Cap 720-0241 Knob Ass’y Wing Nut 5/16-18...
  • Page 21 Model S621 SS Ref. Part No. Part Description 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 712-3006 Nut 1/4-20 732-0807 Torsion Spring LH 736-0270 Bell Wash.
  • Page 22 Safety & Decorative Labels...
  • Page 23 YOUR NOTES Comments Date...

  • Page 24: Cleveland, Ohio

    How to obtain service Contact your authorized Cub Cadet servicing dealer who sold you your Cub Cadet equipment. If this dealer is not available, see the Consumer Yellow Pages under “lawn mowers” for the name of a dealer near you.

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