National Mower HYDRO HYD70OM-8/99 - Manual (Page 23)

NATIONAL HYDRO 70" TRIPLEX ®
23
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.
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
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.