Craftsman 247.797853, 247.797852 manual f Na, Flails, Carburetoradjustment

Allen

Screws

Pi

Sharp of

Torque

Wrenctl

FIGURE 2O,-Model 247.797853 Shown

e Loosen the two hand knobs and cupped washers which secure the chute deflector, arrd raise the chute deflector

e Insert a 1/2" or 3/4" diameter pipe through the flail screen into the impeller to keep it from turning, or remove the flail screen and insert a piece of wood (2 x 4) into the chute opening

e Model 247.797853 only: Remove the two outside screws on the blade, using a 3/16" allen wrench and a 1/2" wrench

eRemove the blade by removing the center bolt, lock washer and flat washer

NOTE: Use caution when removing the blade to avoid contacting the weld bolts on the housing

e When sharpening the blade, follow the original angle of grind as a guide It is extremely important that each cutting edge receives an equal amount of grinding to prevent an unbalanced blade. An unbal- anced blade will cause excessive vibration when rotating at high speeds and may cause damage to the unit.

eThe blade can be tested for balance by balancing it on a round shaft screwdriver or nail Remove metal from the heavy side until it is balanced evenly See figure 21

f Na. \		/,,
/
Bl!de	'__1"	--_j_
FIGURE 21,

e When reassembling the blade, tighten to between 550 and 650 inch pounds, or lacking torque wrench, tighten securely

FLAILS

The flails, located inside the housing, may be reversed when they become dull It is suggested that this procedure be performed by your nearest Sears Service Department

CARBURETORADJUSTMENT

WARNING: IF ANY ADJUSTMENTS ARE

ENGINE IS RUNNING (E.G. CARBURE- MAUE TO THE ENGINE WHILE THE

TOR), KEEP CLEAR OF ALL MOVING PARTS. BE CAREFUL OF HEATED SUR-

FACES AND MUFFLER.

Minor carburetor adjustment may be required to com-

pensate for differences in fuel, temperature, altitude or load

NOTE: A DIRTY AIR CLEANER WILL CAUSE ENGINE TO RUN ROUGH BE CERTAIN AIR CLEANER IS CLEAN AND ATTACHED TO THE CARBURETOR BEFORE ADJUSTING CARBURE- TOR DO NOT MAKE UNNECESSARY ADJUST- MENTS FACTORY SETTINGS ARE SATISFACTO-

RY FOR MOST APPLICATIONS AND CONDITIONS.

/

Never attempt to change maximum engine speed It is pre-set at the factory and should be changed only by a qualified service technician who has the necessary equipment

The carburetor may need re-adjusting if engine lacks power or does not idle properly If adjustments are needed, proceed as follows

e Close needle valve (see figure 22) clockwise ( f-*) finger tight only. Forcing may cause damage Then open 1-1/2 turns counterclockwise ( _ )

e Start engine and allow to warm for five minutes

e With throttle in FAST position, close needle valve clockwise ( ,_ ) until engine starts to lose speed (lean mixture) Then slowly open needle valve counterclockwise (f',) until engine JUST BEGINS to run unevenly This mixture should be rich enough for best performance under load.

ePlace throttle control in IDLE position

If engine idles, no further adjustment is necessary If engine idles too fast, turn idle speed adjusting

screw counterclockwise ( _ ) until slower speed is obtained

If engine dies, turn idle speed adjusting screw 1/4

turn clockwise ( ,_ ). Place throttle control in FAS]_' position and restart engine

Move throttle control to IDLE position_ If engine does not idle, repeat step c

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