15
•
Install the blade adapter on the pulley with the “star”
away from the pulley. See Figure 16.
Figure 16
•
Place the new blade on the blade adapter with the
side marked bottom (has a part number) facing
away from the adapter.
•
Secure the blade to the assembly with two hex
bolts and lock nuts. Tighten the hex bolts to the
recommended torque. Refer to ‘Blade Mounting
Torque’ information below.
•
Install the blade assembly on the engine
crankshaft. Secure with the hex bolt and bell
washer (cupped side of washer to blade) and
tighten to the recommended torque. Refer to ‘Blade
Mounting Torque’ information below.
IMPORTANT:
The bolt used to secure the blade to the
engine is specially heat-treated. Do not substitute. To
order replacement bolt, refer to the parts list in the back
of this manual.
WARNING:
To ensure safe operation of
your unit, all nuts and bolts must be checked
periodically for correct tightness.
Blade Mounting Torque:
Blade adapter bolts: 120 in.lbs. minimum, 150 in.lbs.
maximum.
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.
An unbalanced blade will cause excessive vibration
when rotating at high speeds, may cause damage to
the mower and could break, and may 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.
Replacing Drive Belt
WARNING:
Disconnect the spark plug wire
and ground it against the engine to prevent
unintended starting. Drain fuel into an
approved container or place a piece of plastic
film underneath the gas cap to prevent
gasoline from leaking.
•
Remove the two shoulder screws securing the front
drive cover to the mower deck. See Figure 17.
•
Press inward on the sides of the front drive cover
and release the tabs that secure the front drive
cover to the height adjuster brackets. Remove drive
cover from the mower.
•
Remove the idler and hardware from idler bracket
using 7/16” wrench and socket. See Figure 17.
•
Remove the belt from the transmission pulley as
shown in Figure 17.
Figure 17
•
Lift and stabilize the front of the deck.
•
Loosen the center hex bolt and lower the blade and
engine pulley until there is adequate clearance to
move the belt past the belt keeper.
•
Remove the belt from the engine pulley and around
the blade. See Figure 18.
•
Reassemble new belt (part # 754-0465). Begin idler
reassembly by inserting bolt up through the idler
bracket hole. Adjust the drive clutch following the
instructions below.
NOTE: Torque center hex bolt to between 450 and 600
in. lbs.
Lock Nut
Lock Nut
Pulley
Assembly
Blade
Adapter
Blade
Bell
Washer
Hex Bolt
Hex Bolt
Hex Bolt
Bolt
Drive Belt
Pulley
Shoulder
Screw
Front Drive
Cover
Bracket
BeltKeeper
Lock Nut
Idler
Spacer
Содержание Yard-Man 12A-449T402
Страница 19: ...19 NOTES...
