National Mower HYD70OM-8/99, HY70OM-8/992 owner manual Grinding Procedure, Backlapping Procedure

Page 16

BACKLAPPING PROCEDURE, Continued

5.Stop the reel and examine both bed knife and reel blades to see that the cutting edges are uniformly sharp. If not, gradually tighten hex adjuster and repeat Step 4 on previous page until the proper sharpness results.

6.Rinse off the compound thoroughly with water to remove all abrasive. Check for sharpness and readjust the bed knife if necessary.

7.Check reel adjustment on each mower and adjust if necessary, so that they will cut paper cleanly across the full length of the bed knife when paper is held 90# to the bedknife and pinched when held horizontally.

7.9—GRINDING PROCEDURE

BACK GRIND IN THE

DIRECTION

OF THE ARROW AT 25O

25O

Be extremely careful not to let brush, your fingers or your clothing get caught in the reels. Use approved safety glasses to protect tour eyes from flying particles and abrasives.

Reels must be ground at 25° in the direction shown by the arrow. Back grind until reel blades are free from roundness, dents and nicks. Spin grind to remove all burrs. All blades must be on the same diameter.

For maximum cutting efficiency, grind bed knife top and front edges at 5° as shown.

GRIND BED KNIFE

AT ANGLES SHOWN

5O

Note centerline

5O

POSITION OF REEL

TO THE BLADE

16

HY70OM-8/99

Image 16
Contents Hydro 70 Triplex Declaration of Conformity Raymond Avenue, St. Paul, Minnesota 55114 U.S.ANational Mower Safe Operation Practices For Riding Mowers Table of Contents Introduction Receipt of ShipmentSpecifications Transfers Disposal NumbersNoise Emission & Vibration Transfer Description Assembly Instructions AssemblyTractor Assembly Assembly of Rear Cutting Unit to TractorAssembly of Rear Cutting UNIT, General Information Interlock Switches ChokeThrottle Lever DROP/LIFT Needle ValveAdjustments AdjustmentsTraction Pedal Adjustment Reel Control Clutch AdjustmentSeat Switch Adjustment Height of CUT AdjustmentAdjustment Reel Control ClutchReel END Play Adjustment Reel to Bedknife AdjustmentBacklapping Procedure Grinding Procedure Backlapping ProcedureGeneral Maintenance MaintenanceAssembly & Disassembly Charging a Battery BED Knife ReplacementMaintenance Fuel FilterHydraulic Hoses Hydraulic OILBelt Replacement Hydraulic OIL FilterHandle BAR Removal Jumper CablesBelt Replacement Coupling AlignmentStorage General InstructionsTractor TiresTrouble Shooting Guide Engine will not StartReel will not CUT Tractor will not MoveLubrication National Hydro 70 Triplex Reel Control Parts List Ordering InformationHY70OM-8/99 Tank and Rear Fork Assembly Description QtyHY70OM-8/99 Steering Tower Assembly HY70OM-8/99 Engine and Footrest Assembly KnobHY70OM-8/99 Traction Pedal and Pump Assembly Part No. Description Qty. ItemHY70OM-8/99 Lift ARM and Drive Assembly HY70OM-8/99 Front Cutting Unit Assembly SKIDBAR, L.HHY70OM-8/99 Center Rear Cutting Unit Assembly Side PLATE, L.HPump Wheel Motor Filter Lift Hydraulic Hose and Line Assembly Pump Wheel Motor Filter Lift Tank Hydraulic Fitting Assembly Basket Assembly Kit No Belt Tool KIT KIt NoHeight of CUT BAR Kit No Pump Part NoWheel Motor Part Nos , 07388 Lift Valve Part NoLift Cylinder Part No Front Roller Scraper KIT Part NoRear Roller Scraper KIT Part No Valve Block Part NoNational Mower Company National Mower CompanyRaymond Avenue, St. Paul, Minnesota 55414, U.S.A