4, Removethechipperchutesupportbracefromthe frameby removingthe hexbolts.

5.Rotateimpellerassemblyby handuntil youlocateone of two chipperbladesin thechipperchuteopening.

6, Removethebladeby removingthe internalhex screws,lock washers,andhex nutswhichsecureit to the impeller.Retainthe hardware,SeeFigure15,

NOTE:Usea3/16" hexkey(Allen)wrenchon theoutsideof the blade anda 1/2" box(or socket)wrenchonthe insideof the impeller.Hold the Allenwrenchstationaryand rotatethe box(or socket)wrenchto loosenthenut.

7.

Installa replacementblade(Part No. 742-0544)withthe hardware

 

 

removedearlieror sharpenand replaceexistingblade.

 

IMPORTANT:Whensharpeningthe blade,protecthandsby using

 

gloves.Followthe originalangleof grindandmakesureto removean

 

equalamountfromeachblade.

 

8.

To replacetheother blade,rotatethe impellerto exposethe

Figure15

 

secondbladeand repeatthe stepsabove.

 

NOTE: Makecertainbladesare reassembledwiththe sharpedge facingthe samedirectionas when removed.Torquehardwareto 250

-300in. Ibs.

Weld Studs,

The impeller'schipperbladesand shredderbladearesharp.Wear leatherworkglovesto protectyour hands.

Impeller

Blade

J

SHARPENING OR REPLACING THE SHREDDER BLADE

1.Stopthe engineandmakecertainthatallmovingpartshave cometo a completestop.

2.Disconnectthe sparkplugwire andgroundagainsttheengine.

3.Lowerthehopperassemblyandplacea blockundertheflailhousing.

4.Removethesix hexlocknutsandflatwashersfromthe weld studsonthe flail housing.Retainthe hardware.

5.Carefullyseparatethe hopperassemblyfromthe impelleras- semblyand removethe shredderplate.The shredderplatecan be identifiedby referringto item29in the partsliston page20 &21.

NOTE:Whenreassemblingthe shredderplate,makecertainthe embossedtab facesinwardtowardstheimpeller.

6.Removethetwo wingknobsthatsecurethe chutedeflectorand raisethe chute.

7.Inserta 1/2" or3/4" diameterpipethroughthe flail screenintothe impellerto keepit fromturningor removethe flail screenand inserta pieceof woodintothe chuteopening.

8.A. Removethe twointernalhex screws,lockwashers,andhex locknutswhichsecurethe shredderbladeto the impeller.

B. Removethe hexbolt,lockwasher,andflat washerto completelyfreeshredderblade.SeeFigure16.

9.Installa replacementblade(Part No.742-0544)withthe hardware removedearlieror sharpenandreplaceexistingblade.

/

Flail Housing

Figure16

IMPORTANT:When reassemblingthe shredderblade,tightencenter boltto between550and700in.-Ibs,andthe twooutsideboltsto

between250and350in.-Ibs.

NOTE:Usea 3/16"hex key(Allen)wrenchonthe outsideof the shredderbladeanda 1/2" box(or socket)wrenchon the insideof the shredderblade.Holdthe Allenwrenchstationaryand rotatethe box (orsocket)wrenchto loosenthe nut. Usecautionwhen removingthe bladeto avoidcontactingthe weldstudson housing.

IMPORTANT:Whensharpeningthe blade,followtheoriginalangle of grindas a guide.It is extremelyimportantthateachcuttingedge receivesan equalamountof grindingto preventan unbalancedblade. An unbalancedbladewill causeexcessivevibrationwhen rotatingat highspeedsandmaycausedamageto the unit. The bladecan be testedby balancingit on ascrewdriverornail. Removemetalfromthe heavysideuntil it is balancedevenly.

17

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Craftsman 1450 Series, 247.77638 Sharpening or Replacing the Shredder Blade, Flail Housing, Between250and350in.-Ibs

247.77638, 77638, 1450 Series specifications

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