Yard-Man 604 - Manual (Page 22)

22
• Remove the hex bolt from the center of the
engine pulley (or the electric PTO clutch on
units so equipped) and gently lower it off of
the engine crankshaft. Be careful not to lose
any washers or spacers which may be found
on top of the engine pulley or the electric PTO
clutch. See Figure 18.
• On units equipped with an electric PTO, the
engine pulley is located directly above the
electric PTO clutch. Lower the engine pulley
far enough to be able to remove the upper
drive belt from around it
.
IMPORTANT: When remounting the engine
pulley or electric PTO clutch, torque the center hex
bolt to between 38 foot-pounds and 50 foot-pounds.
• Remove the drive belt by feeding it from both
ends toward the front idler pulley on the
double-idler bracket. See Figure 16.
• Reassemble by following the above steps in
reverse order.
• Reroute the new belt around the pulleys and
belt keepers EXACTLY as the old one was
routed. Refer to Figure 16.
The AutoDrive
™
pedal is properly adjusted when the
hole found in the double-idler bracket has
approximately 1-3/8" of travel with ten pounds of
pressure applied to the AutoDrive
™
pedal. See
Figure 19.
Figure 19
Adjust the AutoDrive
™
pedal after replacing the drive
belts on your tractor, if necessary, as follows:
• Locate the speed control assembly on the
underside of the steering support bracket. See
Figure 20.
• Remove both hairpin clips from the pin which
is fastened to the speed control assembly (be
careful not to lose the small flat washers found
on the pin). See Figure 20.
• Remove the AutoDrive
™
pedal return spring.
Using two 9/16" wrenches, remove the pin from the
speed control assembly. See Figure 20.
Figure 20
Thread the idler adjustment rod inward or outward to
lengthen or shorten the travel of the double-idler
bracket until proper adjustment is achieved.
• Reassemble by following the above steps in
reverse order.
CUTTING BLADES
WARNING: Cutting blades are sharp.
Always protect hands by wearing heavy
leather work gloves to grasp blades.
The blades may be removed for sharpening or
replacement as follows.
• Remove the deck from beneath the tractor,
(refer to DECK REMOVAL earlier in this
section for detailed instructions) then gently
flip the deck over to expose its underside.
• Place a block of wood between the center
deck housing baffle and the cutting blade to
act as a stabilizer. See Figure 21.
Figure 21
• Use a 15/16" wrench to remove the hex flange
nut that secures the blade to the spindle
assembly. See Figure 21.
Front of Tractor
NOTE: View shown from above tractor.
Double-idler
Bracket
Idler
Adj. Rod
Hole
Speed Control
Assembly
Hairpin
Clips
Idler
Adj. Rod
Pin
AutoDrive ™ Pedal
Return Spring
Place Wrenches Here
Neutral
Return
Bracket
Cutting Blade
Block of Wood
Spindle
Assembly
Hex Flange Nut