Lubrication; Blade Care; To Remove Blade; To Replace Blade - Yard-Man 550 Series Operator's Manual

Lubrication
Lube
Figure 10: Lubrication Chart
Wheels
• Lubricate the wheels and bearings, if so equipped,
at least once a season with light oil or engine oil.
Also, if the wheels are removed for any reason,
lubricate the surface of the pivot arm axle and the
inner surface of the wheel with light oil.
Mulch Plug & Rear DischargeDoor
• Lubricate the torsion spring and the pivot point on
each end of the rear discharge door using a light oil.
Transmission
• The transmission is pre-lubricated and sealed at
the factory and does not require lubrication on a
regular basis as part of maintenance.
BladeControl
• Lubricate the pivot points on the blade control and
the brake cable at least once a season with light oil.
The blade control must operate freely in both
directions.
Engine
• Follow the engine manual instructions and
recommended schedule for lubricating engine
components.
BladeCare
• Periodically inspect the blade adapter and pulley
for cracks, especially if you strike a foreign object.
12
_ ARNING: When removing the cutting blade for sharpening or replacement, protect
hands by using heavy gloves or a thick rag to
grasp the cutting blade.
• Disconnect spark plug wire from spark plug.
• Turn mower on its side making sure that the air filter
and the carburetor are up.
To RemoveBlade:
• Remove the hex bolt which holds the blade
adapter-pulley assembly to the engine crankshaft.
See Figure 11. Remove the pulley assembly and
the bell support from the crankshaft.
Remove blade from the blade adapter and pulley.
Blade
Adapter-Pulley
Assembly
Blade Bell
Support _..._
Hex Bolt
Figure 11
To ReplaceBlade:
• Before reinstalling the blade-pulley assembly to the
unit, lubricate the engine crankshaft and the inner
surface of the blade adapter with light oil.
• Also lubricate the bolt hole and the hex bolt.
• Insert the hex bolt, earlier removed, through the
center holes on the blade bell support and the
blade adapter-pulley assembly respectively.
• Install the blade assembly on the crankshaft.
Tighten the hex bolt to the recommended torque.
Blade Mounting Torque:
Center bolt: 450 in.lbs, minimum, 600
in.lbs, maximum.
To Sharpen Blade:
• The blade can be sharpened with a file or on a
grinding wheel. Do not attempt to sharpen the
blade while it is still on the mower.
• Follow the original angle of grind as a guide. Make
sure that each cutting edge receives an equal
amount of grinding to prevent an unbalanced blade.
NOTE: An unbalanced blade will cause excessive
vibration when rotating at high speeds, may cause
damage to the mower and could break, causing
personal injury. Test the blade by balancing it on a
round shaft screwdriver or a blade balancer.
• If the blade is not balanced, remove metal from the
heavy side until it balances evenly.