Bolens 769-00407 Sharpening or Replacing Chipper Blade, Disconnect and ground the spark plug wire

SHARPENING OR REPLACING CHIPPER BLADE

Because the engine on this unit has a tapered crankshaft, a special impeller removal tool (part number 753-0900) is required to remove the impeller assembly. For further assistance, contact your Sears Service Center.

NOTE: When tipping the unit, empty the fuel tank and keep engine spark plug side up.

•Disconnect and ground the spark plug wire.

•Remove the front hubcaps, lock nuts, front wheels, and wave washers that attach to the pivot arm assemblies. See Figure 17.

•Remove the shoulder screws and bell washers that go through the pivot arms and height bracket adjusters to the front support brace.

Pivot Arm Assembly
	Bell Washer
	Wave Washer
	Hubcap
Height Adjustment
Bracket
Shoulder
Screw	Lock Nut

Figure 17

•Remove the three screws on the upper housing that secure the nozzle cover and the nine screws that secure the lower housing to the upper housing. See Figure 18.

Housing
Screws
Nozzle	Lower Housing
	Screws
Screws

Figure 18

•Remove lock nut that secures flail screen to the lower housing. The flail screen does not have to be removed. Refer to Figure 15.

•Remove the hex bolt, lock washer, and flat washer that secure the impeller assembly to the crankshaft. See Figure 19.

Upper

Housing

Chipper

Blade

Impeller

Assembly

Hex Bolt

Lock Washer

Flat Washer

Flail

Blade

BOTTOM VIEW

Figure 19

•Apply lubricant to the threads of impeller removal tool and then thread the tool into the crankshaft. Stop when the impeller assembly can move on the crankshaft.

•Remove the impeller assembly from the crankshaft. Unthread the impeller removal tool from the impeller assembly.

•Remove the chipper blade using a 3/16" allen wrench on the outside of the blade and 1/2" wrench on the underside of impeller assembly.

•Replace or sharpen chipper blade.

•When sharpening blade, protect hands by using gloves and follow the original angle of grind.

•Reassemble by performing the previous steps in reverse order.

•Tighten blade screws to 210 - 250 in-lbs.

•Tighten impeller bolt to 375 - 425 in-lbs.

NOTE: Make certain chipper blade is reassembled with the sharp edge facing upward. See Figure 20.

Flail	Chipper
	Blade
Blade
	Impeller
	Assembly

Figure 20

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