National Mower HY70OM-8/992 Trouble Shooting Guide, Engine will not Start, Reel will not CUT

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NATIONAL® HYDRO 70" TRIPLEX

10—TROUBLE SHOOTING GUIDE

10.1—ENGINE WILL NOT START

Check fuel in tank.

Check if fuel is at end of fuel line at carburetor.

If not, clean filter on fuel shutoff on bottom of tank.

If not, replace fuel filter.

Check spark plugs.

Check for spark at spark plug.

Check for foul condition.

Replace spark plug if necessary, refer to Briggs and Stratton engine manual for recommended spark plug number and gap.

Check position of reel engagement lever and traction pedal, both must be in disengaged (lever) and neutral (pedal) position.

Check electrical wiring and switch operation.

Check positioning of reel control safety switch and traction pedal neutral safety switch. Both must be adjusted to allow current flow from the “s” terminal to the starter solenoid.

Refer to Page 26 for circuit diagram.

Check for continuity of each safety switch. Replace switch as required.

Check battery for charge level. Replace or charge if necessary.

Check for corrosion on battery terminals, clean as necessary.

slippage still occurs as a result of belt wear and belt stretch, replace the belt.

Check drive belts between engine and countershaft pulley. If adjustment is necessary, this can be accomplished by adjusting the clevis on the reel engagement lever for more tension on the belts. If clevis needs to be adjusted beyond the thread length available, replace the belt.

10.4—REEL WILL NOT CUT

Check reel to bedknife clearance with paper, (common newspaper), the reel should cut the entire length of the bedknife. If adjustment is necessary adjust clearance by turning (equal turns on each side of the reel) hex reel adjusters located on each side of the reel. Turn a 1/8 turn at time, periodically checking with paper.

Inspect condition of the reel and bedknife and service as necessary.

To avoid possible serious injury, before making any adjustments or performing maintenance, place all controls in neutral, fully lower cutting units to the ground, turn ignition switch “OFF” and remove key.

10.2—TRACTOR WILL NOT MOVE

Disengage parking brake.

Check towing valve assuring that the valve is totally closed.

Check linkage from traction pedal to the pump control mechanism to assure complete attachment of all linkages.

10.3—REEL NOT TURNING:

Check for debris jammed between reel and bedknife.

Check for proper belt tension. Tensioning on belts for countershaft to reel is non-adjustable. Check the condition of the slider shaft (under spring) of the push and pull arms for free movement, if necessary clean shaft and apply grease to mating surfaces. If

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Contents Hydro 70 Triplex Raymond Avenue, St. Paul, Minnesota 55114 U.S.A Declaration of ConformityNational Mower Safe Operation Practices For Riding Mowers Table of Contents Receipt of Shipment IntroductionSpecifications Noise Emission & Vibration Disposal NumbersTransfers Transfer Description Assembly of Rear Cutting Unit to Tractor Assembly InstructionsAssembly Tractor AssemblyAssembly of Rear Cutting UNIT, General Information DROP/LIFT Needle Valve Interlock SwitchesChoke Throttle LeverReel Control Clutch Adjustment AdjustmentsAdjustments Traction Pedal AdjustmentReel Control Clutch Seat Switch AdjustmentHeight of CUT Adjustment AdjustmentBacklapping Procedure Reel to Bedknife AdjustmentReel END Play Adjustment Backlapping Procedure Grinding ProcedureAssembly & Disassembly MaintenanceGeneral Maintenance Fuel Filter Charging a BatteryBED Knife Replacement MaintenanceHydraulic OIL Hydraulic HosesJumper Cables Belt ReplacementHydraulic OIL Filter Handle BAR RemovalCoupling Alignment Belt ReplacementTires StorageGeneral Instructions TractorTractor will not Move Trouble Shooting GuideEngine will not Start Reel will not CUTLubrication National Hydro 70 Triplex Reel Control Ordering Information Parts ListHY70OM-8/99 Description Qty Tank and Rear Fork AssemblyHY70OM-8/99 Steering Tower Assembly HY70OM-8/99 Knob Engine and Footrest AssemblyHY70OM-8/99 Part No. Description Qty. Item Traction Pedal and Pump AssemblyHY70OM-8/99 Lift ARM and Drive Assembly HY70OM-8/99 SKIDBAR, L.H Front Cutting Unit AssemblyHY70OM-8/99 Side PLATE, L.H Center Rear Cutting Unit AssemblyPump Wheel Motor Filter Lift Hydraulic Hose and Line Assembly Pump Wheel Motor Filter Lift Tank Hydraulic Fitting Assembly Belt Tool KIT KIt No Basket Assembly Kit NoPump Part No Height of CUT BAR Kit NoLift Valve Part No Wheel Motor Part Nos , 07388Front Roller Scraper KIT Part No Lift Cylinder Part NoValve Block Part No Rear Roller Scraper KIT Part NoRaymond Avenue, St. Paul, Minnesota 55414, U.S.A National Mower CompanyNational Mower Company