Troy-Bilt N779Pony Benutzerhandbuch

23

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To properly sharpen the cutting blades, remove 
equal amounts of metal from both ends of the 
blades along the cutting edges, parallel to the 
trailing edge, at a 25° to 30° angle. See Figure 18.

 If the cutting edge of the blade has already 

been sharpened to within 5/8" of the wind wing radius, 
or if any metal separation is present, replace the blades 
with new ones. See Figure 18.

It is important that each cutting blade edge be ground 
equally to maintain proper blade balance. 

A poorly balanced blade will cause excessive vibration 
and may cause damage to the tractor and result in 
personal injury. The blade can be tested by balancing it 
on a round shaft screwdriver. Grind metal from the 
heavy side until it balances evenly. 

When replacing the blade, be sure to install the blade 
with the side of the blade marked ‘‘Bottom’’facing the 
ground when the mower is in the operating position. 

 Use a torque wrench to tighten the blade 

spindle hex flange nut to between 70 foot-pounds and 
90 foot-pounds. 

special tools (i.e. air/impact wrench) in order to change
the tractor’s drive belts. See an authorized Troy-Bilt
Service Dealer to have your drive belts replaced or
phone Customer Support as instructed on page 2 for
information on ordering a Service Manual.

Spindle Assembly

Hex Flange Nut

Wood Block

Blade Separation

Worn Blade Edge

Wind Wing

Sharpen Edge Evenly

5/8"

minimum