National Mower 68 SR Safety Switches, Ignition Switch Model 68 DL shown, Parking Brake Lever

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OPERATION

K.Ignition Switch (Model 68 DL shown)

CAUTION

ALWAYS SHUT OFF THE ENGINE AND REMOVE THE KEY BEFORE LEAVING THE MOWER SEAT.

The 68 DL ignition switch is located on

the instrument cluster. It is a three- position switch.

Turn the key clockwise to the middle position to activate the electrical system. Turn the key to the full clockwise position to start the

M. Parking Brake Lever

Provides a lock for the brake. Push brake lever forward, over center, to lock. Pulling brake lever back, toward the rear of the machine will disengage the brake.

N. Service

Brake

Depress the Ser- vice Brake foot pedal to slow the mower and lock the rear wheels in the full stop position.

engine. Turn the switch counterclockwise to shut off the engine.

The 68 SR ignition switch (not shown) is located on the steering column. It is a two-position switch.

Turn the key clockwise to activate the electrical system and allow the engine to be started. Turn the switch counterclockwise to shut off the engine.

L. Differential Shift Lever

 

 

Never shift while machine is in mo-

 

WARNING

 

tion, as damage to the gears could

 

 

result. Always disengage engine clutch before attempt-

ing to shift.

 

 

 

 

Located on the mower differential, this control has three po- sitions: For- ward, Neu- tral (center p o s i t i o n ) ,

and Re- verse. The lever must be pulled to- ward the cen-

ter of the machine to clear the notch in the stop disc and positioned securely in the new notch.

Note: It is best to slow the mower with the throttle and then disengage clutch lever before

applying brake. This prevents excessive wear and engine overload.

SAFETY SWITCHES

Your National 68 mower is equipped with safety switches to monitor the operating conditions of certain machine functions and stop the mower whenever unsafe conditions are found.

It is necessary for both the main engine clutch and the wing cutting unit clutch to be in their neutral position to start the engine. The 68 DL also requires the operator be in the seat. The 68 SR does not require the operator to be in the seat to facilitate use of the hand recoil starter.

If you encounter difficulties starting the mower’s engine, or keeping it running, check the chart in the Safety Switches section of this manual to make sure you are not causing the engine to kill or become unable to start.

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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 IntroductionSafety Information National Mower Safe Operating PracticesTraining Preparation OperationMaintenance ISO Safe Operating PracticesHill Operation 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 Reel to BED Knife Adjustment Rear Cutting Unit BeltNational 68 SR & DL Triplex Wing Cutting Units EngineOperation PreparationMain Clutch Lever Seat Position Adjuster Lever Transport Clutch Model 68 DL onlyRear Cutting Unit Clutch Wing Cutting Unit Latch Rear Cutting Unit Lift ArmSafety Switches Ignition Switch Model 68 DL shownService Brake Parking Brake LeverHeight of CUT Adjustment Other AdjustmentsStandard Adjusters DIAL-A-HEIGHT Adjuster OptionalMaintenance LubricationLubrication Points Maintenance Lubrication Points Reel Adjustments Reel END Play AdjustmentHeight of CUT 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 TensionBack Lapping Procedure IntroductionRecommended Steps 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 DLSpecifications Mower Dimensions & WeightEngine 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.
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