National Mower 68 DL Rear Cutting Unit Belt, National 68 SR & DL Triplex Wing Cutting Units

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REAR CUTTING UNIT BELT

Install Rear Cutting Unit Belt (A) from Countershaft Pulley

(B)to outer Drive Pulley (C). Idler Pulley (D) must ride on top of lower belt to provide proper tension. NOTE: It will be necessary to raise rear cutting unit to allow enough slack to get belt over pulleys.

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NATIONAL 68 SR & DL TRIPLEX

WING CUTTING UNITS

1.Remove the two Wing Cutting Unit Belts from the steering column.

2.Release the Laches (A) from Wing Cutting Units. To release the latch, lift the wing cutting unit handle until the latch swings upward into a nearly vertical position. Carefully lower the cutting unit to the ground. Avoid dropping the cutting unit, as damage may result to the cutting unit, the mower, or your turf.

3.Slip wing Cutting Unit belts (B) over Countershaft Pulleys (C).

4.Block mower wheels to prevent mower from moving forward. Pull Wing Cutting Units (D) forward so that they slide on Pull Rods (E) and compress springs (F). This will allow enough slack to enable belts to be installed over Reel Pulleys (G).

5.Pull Cutting Units backwards to adjust belt tension. Tighten bolt (H) to lock in place.

REEL TO BED KNIFE ADJUSTMENT

To prevent damage during shipment, the reels have been moved away from the bed knives at the factory. Follow the procedure for "Reel to Bed Knife Adjustment" in the Maintenance section of this manual to properly adjust your cutting units.

ENGINE

CAUTION MOWER IS SHIPPED WITH DRY ENGINE. DO NOT START ENGINE

UNTIL OIL IS ADDED TO CRANKCASE. See Engine Manual for additional information.

DIFFERENTIAL

Grease has been installed in the differential at the factory. For additional information, refer to the Maintenance sec- tion of this manual.

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 Introduction Table of ContentsNational Mower Safe Operating Practices Safety InformationTraining Preparation OperationISO Safe Operating Practices MaintenanceHill Operation TrainingCalifornia Safe Operating Practices Maintenance and StorageMain Engine Clutch Lever Safety and Control DecalsSafety and Control Decals Height Adjuster Safety and Control Decals Uncrating Instructions Receipt of ShipmentSeat AssemblyRear Cutting Unit Rear Cutting Unit Belt Reel to BED Knife AdjustmentNational 68 SR & DL Triplex Wing Cutting Units EngineOperation PreparationMain Clutch Lever Transport Clutch Model 68 DL only Seat Position Adjuster LeverRear Cutting Unit Clutch Wing Cutting Unit Latch Rear Cutting Unit Lift ArmIgnition Switch Model 68 DL shown Safety SwitchesService Brake Parking Brake LeverOther Adjustments Height of CUT AdjustmentStandard Adjusters DIAL-A-HEIGHT Adjuster OptionalLubrication MaintenanceLubrication Points Maintenance Lubrication Points Reel END Play Adjustment Reel AdjustmentsHeight of CUT Adjustment Brake AdjustmentMain Drive Belt Tension Main Countershaft to Rear Drive Adjusting Drive Belt TensionRear Cutting Unit Drive Belt Tension Rear Cutting Unit Chain Tension BED Knife ReplacementIntroduction Back Lapping ProcedureRecommended Steps Grinding ReelsMaintenance Record Situation Things To Check TROUBLE-SHOOTINGFrame & Running Gear Parts ListDescription Qty Rear Tire & Wheel AssemblyRunning Gear & MISC. Parts -- Model 68 DL Washer Seat Mounting & Belt GuardsDrive Mechanism -- Upper Portion Spring Drive Mechanism -- Middle Portion Drive Mechanism -- Lower Portion Drive Mechanism -- Model 68 DL Needle Bearing Rear Axle & Differential Shifter Lever Part No. Description QtyWing Cutting Units Roller Rear Cutting Unit Countershaft SKIDS, Reel END Shields & Guards Rollers & Standard Scrapers Description Qty. per Kit DIAL-A-HEIGHT Roller Scraper KIT, P/N 860033 includes itemsDIAL-A-HEIGHT Roller Adjuster KIT, P/N DIAL-A-HEIGHT ADJUSTER, P/N 205348 Response Safety SwitchesElectrical Diagrams Description Qty Model 68 SR Model 68 DL Electrical PARTS-- Models 68 SR & 68 DLMower Dimensions & Weight SpecificationsEngine Briggs & Stratton 138400 Series 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.