National Mower 68 SR, 68 DL Reel Adjustments, Reel END Play Adjustment, Height of CUT Adjustment

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MAINTENANCE

 

DANGER

To assure safety, disengage the

 

engine clutch lever, remove the

 

 

ignition key, and disconnect the engine spark plug

wire prior to making any of the following adjustments.

 

 

 

 

 

 

 

 

Handle reel assemblies carefully

 

DANGER

 

with protective gloves. Reels are

 

 

very sharp. Reels rotate freely and rotating one reel can cause other reels to rotate. Special care should be taken in the area where the reel contacts the bed knife.

REEL TO BED KNIFE ADJUSTMENT

The reel is adjusted to a fixed position bed knife. This construction allows a more rugged and durable frame and retains the proper adjustment longer. The Reel Adjuster Bolt (A) regulates reel distance from the bed knife.

To reduce the distance, turn the upper hex adjuster nut on each side of the reel down. Proceed slowly and do not over-adjust -- use about 1/8 of a turn on each side at first.

REEL ADJUSTMENTS

NOTE: Guards removed or cut away to show detail

Do not adjust one side more than the other unless the reel is obviously out of alignment. Do not get the reel so tight that it is hard to turn by hand. A too tight reel will wear faster.

Ideally, the reel should “wipe” or lightly touch the bed knife. It is not necessary to adjust or change the position of the lower adjustment nut.

Proper cutting action may be tested by holding paper strips between the reel and the bed knife. Turn the reel by hand and check to see if the assembly cuts the paper all the way across the width of the bed knife. Make sure that the adjusting and the locking nuts on both side are tightened securely.

REEL END PLAY ADJUSTMENT

Test for end play periodically by trying to move the reel from side to side in the frame. If there is ANY movement, adjust the bearings by loosening the lock nut on the adjustment bolt (B) which is located on the inside right end of the reels, and turning the adjustment bolt IN one half turn or less. Do not overtighten. An overtightened bearing will cause excessive bearing wear. Test again for end play and if reel is rotating freely and end play is not noticeable, tighten the lock nut.

HEIGHT OF CUT ADJUSTMENT

Refer to "Height of Cut Adjustment" in the Operation section of this manual.

BRAKE ADJUSTMENT

The foot brake is properly adjusted if it slows the machine when depressed and can be locked when the pedal is depressed fully.

Adjust brake tension by removing cotter pin and brake pedal pin and turning brake clevis located under pedal on brake rod. When adjustment is complete, attach clevis to pedal with pin and cotter pin.

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68OM-06/03

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Contents Model 68 SR Triplex Mower Model 68 DL Triplex Mower There is no Other Warranty Expressed or Implied ONE Year Limited WarrantyNational Mower Company Table of Contents IntroductionTraining Preparation Safety InformationNational Mower Safe Operating Practices OperationHill Operation MaintenanceISO Safe Operating Practices TrainingMaintenance and Storage California Safe Operating PracticesSafety and Control Decals Main Engine Clutch LeverSafety and Control Decals Height Adjuster Safety and Control Decals Receipt of Shipment Uncrating InstructionsSeat AssemblyRear Cutting Unit National 68 SR & DL Triplex Wing Cutting Units Reel to BED Knife AdjustmentRear Cutting Unit Belt EngineOperation PreparationMain Clutch Lever Rear Cutting Unit Clutch Seat Position Adjuster LeverTransport Clutch Model 68 DL only Wing Cutting Unit Latch Rear Cutting Unit Lift ArmService Brake Safety SwitchesIgnition Switch Model 68 DL shown Parking Brake LeverStandard Adjusters Height of CUT AdjustmentOther Adjustments DIAL-A-HEIGHT Adjuster OptionalMaintenance LubricationLubrication Points Maintenance Lubrication Points Height of CUT Adjustment Reel AdjustmentsReel END Play Adjustment Brake AdjustmentMain Drive Belt Tension Main Countershaft to Rear Drive Adjusting Drive Belt TensionRear Cutting Unit Drive Belt Tension BED Knife Replacement Rear Cutting Unit Chain TensionRecommended Steps Back Lapping ProcedureIntroduction Grinding ReelsMaintenance Record TROUBLE-SHOOTING Situation Things To CheckParts List Frame & Running GearRear Tire & Wheel Assembly Description QtyRunning Gear & MISC. Parts -- Model 68 DL Seat Mounting & Belt Guards WasherDrive Mechanism -- Upper Portion Spring Drive Mechanism -- Middle Portion Drive Mechanism -- Lower Portion Drive Mechanism -- Model 68 DL Needle Bearing Rear Axle & Differential Part No. Description Qty Shifter LeverWing Cutting Units Roller Rear Cutting Unit Countershaft SKIDS, Reel END Shields & Guards Rollers & Standard Scrapers DIAL-A-HEIGHT Roller Scraper KIT, P/N 860033 includes items Description Qty. per KitDIAL-A-HEIGHT Roller Adjuster KIT, P/N DIAL-A-HEIGHT ADJUSTER, P/N 205348 Safety Switches ResponseElectrical Diagrams Electrical PARTS-- Models 68 SR & 68 DL Description Qty Model 68 SR Model 68 DLEngine Briggs & Stratton 138400 Series SpecificationsMower Dimensions & Weight Sound & Vibration LevelsParts Ordering Information Belt CROSS-REFERENCE ChartFunction National Number Belt Mfr Number Declaracion DE Conformidad Déclaration DE ConformitéConformiteitsverklaring Raymond Avenue Box Saint Paul, Minnesota Tel Fax

68 SR, 68 DL specifications

The National Mower 68 DL and 68 SR are two outstanding models in the world of lawn care, engineered for efficiency and ease of use. Both mowers offer a range of features tailored to meet the needs of both residential and commercial users, making them popular choices among landscapers and homeowners alike.

The National Mower 68 DL is designed with durability and performance in mind. It features a robust steel deck that enhances longevity while providing a clean and even cut. Equipped with a powerful engine, the 68 DL delivers high torque and swift acceleration, enabling users to tackle even the toughest grass and rough terrain effortlessly. The mower's advanced cutting system ensures that grass is cut finely and evenly, reducing the need for additional clean-up.

On the other hand, the National Mower 68 SR offers a self-propelled option, allowing users to move with ease across various landscapes. This model incorporates hydrostatic transmission technology, which provides smooth, variable speed control. This feature is particularly beneficial for those who demand precision in their mowing tasks, as it allow for adjustments on the fly, catering to changing terrain conditions.

Both models come with adjustable cutting height options, offering users the flexibility to choose their desired grass length. The easy-to-use lever enables quick and simple adjustments without needing tools, making the mowing process more efficient. Additionally, both the 68 DL and 68 SR are designed with ergonomics in mind, featuring comfortable handles and intuitive controls that minimize operator fatigue.

Safety is another critical consideration in the design of the National Mower 68 series. Both models come equipped with protective shields and safety switches to prevent accidental starts, ensuring that users can operate the machines with confidence.

For convenience, the mowers also feature large, easy-roll wheels that enhance maneuverability. The inclusion of a bagging system offers an option for collection of grass clippings, contributing to a cleaner lawn appearance post-mowing.

In summary, the National Mower 68 DL and 68 SR combine advanced engineering with user-friendly features that prioritize performance and safety. They are exceptional choices for anyone looking to maintain a pristine lawn with minimal effort, making yard work a more enjoyable task. Whether for home use or professional landscaping, these mowers stand out in their class, delivering reliable performance time after time.