Toro 4250 Bedienungsanleitung

4250,

4505,

8605

AND LATER COMPLIANT MOWERS

All

LawnBoy Compliant Scamp ModelMowers

feature a Flywheel Brake system. It will stop the

bladefromturningwithin

secondsafterthe

operator releases the bail. The engine also stops

at the same time.

Adjustmentsand servicing

the Scamp self-

propelledmowers arevery differentfromall

previous models of self-propelled mowers.

SAFETYWARNING: Before anyad-

justmentsor repairs are attempted,

disconnect andremovespark plug to

prevent starting.

INSTALLING CONTROL

ROD

Placeretainer clipon clutch arm with long side

of clip on the inside of clutch arm.

Align hole in clip with hole in arm and assem-

ble lower end

the control rod in hole.

Turn (swivel)long end of clip up and snap into

position on lower control rod as shown.

SCAMPMODELS

SERVICINGANDADJUSTMENTS

SELF-PROPELLED

SAFETYWARNING:The lowerself-

propelcontrol rodmust be assembled

to clutcharm as shown.If not theself-

propelmechanism will not return to

neutral when thecontrol lever

released fromthe engaged position.

SCAMPMODELS

SELFPROPELLED

SERVICING AND ADJUSTMENTS

With the control handle in “neutral”(free) posi-

Secureupperand lower control rodstogether

tion as shown. withthe clampscrew as shown.This screw should

be tightened securelyby hand.

With the clutch arm resting on the handle and

wheel bracket as shown.

SAFETY WARNING: Improper tighten-

ing

clamp screw

control rod may

result inoperator

loss

drive control

mechanism.

NOTE:

put mower in motion, pull

upward oncontrol handle andhold in

drive position.

stop forward motion

of mower, release control handle.

Mower drive mechanism functions

only when the control handle is held

“DRIVE”

position.

19.42

SERVICE BULLETIN REFERENCES

1983

SCAMP MODELS

SELFPROPELLED

SERVICING AND ADJUSTMENTS

DRIVE

ROLLER

ADJUSTMENT

1. Withthecontrolhandlein “Neutral”, placeboth

Loosenboltandnutlocated indrive roller gap

rearwheel heightadjusters in #1 (lowest) cuttingadjustingslotoneachside

drive roller bracket.

position as shown.

gap

3/16” should appear

betweenthe drive rollersand tires. 3. Move the drive rollerbracket upor down to

ob-

tain thenecessary 3/16’’ drive roller gap. Hold

bracketin position and tighten both bolts and nuts

securely.

SCAMPMODELS

REPLACEMENT AND SERVICING

SELF-PROPELLEDDRIVE BELT

BELTREMOVAL

REPLACEMENT

SAFETY WARNING:To prevent start-

ingengine, disconnect sparkpluglead

and remove spark

plug.

The

“V”

belt used onthe utilityself-propelledmodel

mowers

a SPECIALBELT.

NOTUSE A

SUBSTITUTE. Itwon’t work as WELL

LONG.

remove

the belt:

Remove four belt guard cover screws and

remove cover.

Turn mower up on side and remove nut, blade

andcollar. Removethreeboltssecuringmuffler and

crankshaft support. Remove muffler.

19-44

SERVICE BULLETIN REFERENCES

1983

Remove belt from driven pulley and slide shaft

assemblytothe right.Removebelt frommoweras

shown.

SCAMPMODELS

REPLACEMENT AND SERVICING

SELF-PROPELLEDDRIVE BELT

SAFETY WARNING:

prevent start-

ing

engine, disconnectand remove

sparkplugprior to removingthe

engine.

Remove three bolts securing engineto muffler

plate andremoveengine.

NOTE:

not remove mufflerplate

from housingwhen removingengine.

Removeengine and remove drivebelt fromdrive

pulley.

SAFETYWARNING:

notoperate

mower with belt guard removed.

Remove roll pin from left hand drive roller and

remove roller.

SCAMPMODELS

REPLACEMENT AND SERVICING

SELF-PROPELLEDDRIVE BELT

NOTE:

After thebelthas been re-

moved, examine for broken, cracked or

misalignedpulleys.The conditionand

the wear pattern of the belt will pro-

vide cluesfor the above possibilities.

Replace damaged or worn pulleys.

The crankshaft pulley (drive pulley) is secured

tothe crankshaftwith aSPECIALslotted set screw.

Theend

this screwlocates in ahole in the

crankshaft. The correct position and tightness is

veryIMPORTANT.

nottightened securely,

damage to the pulley, crankshaft and premature

wear

the drive belt will result.

NOTE:

ApplyOMC Ultra-LockPart No.

388517

tothreadsof set screwpriorto

installation.

When reinstallingpulley to crankshaft, the side

of the pulley with set screw is the lower side.

assembledupsidedown (set screwon top)

misalignment and interference of pulley operation

will result. Alwayscheck pulley for damage.

Replace

necessary.

19-46

SERVICE BULLETIN REFERENCES

1983

IDLER

PULLEYS TOP STRAND

DRIVE-BOTTOMSTRANDENGINE

SHAFT

DRIVE

PULLEY PULLEY

SCAMPMODELS

REPLACEMENT AND SERVICING

SELF-PROPELLEDDRIVE BELT

SAFETY WARNING

SAFETY

WARNING:

Incorrectdrive

belt installation may allow mower to

operate in reversedirectioncausing

injury to the operator or bystanders.

Assemble drive belt as shown.

INSTALL BELT AS SHOWN

FOR

PROPERPULLEYROTATION

11.

Check the condition

thedrive shaft, bronze

bearings, and sleeve.

signs

damage or wear

appear, replacethem.

SERVICE BULLETIN REFERENCES

...................................................................................................................................................................

19.47

1983

SCAMPMODELS

REPLACEMENT AND SERVICING

SELF-PROPELLEDDRIVE BELT

12. Reassemble the drive shaftintothebearing

and slideit to the leftasfar as possible. Assemble

the washer and drive roller on the drive shaft.

INSTALLBELT AS SHOWN

FOR

PROPERPULLEYROTATION

13. The drive rollers mustbe properly installed to

utilize the self-cleaningfeature. Properinstallation

is with the vee pointing toward the wheel.

14. Using anew roll pin, assemble thedrive roller

tothedrive shaft. Usea5/32”

larger drift punch,

drivethe rollpin intoplace, flush with the outersur-

face. Neitherend should protrudebeyondthe roller

surface.

15. As you face the front of the mower, twist the

forward end ofthe belt1/4turn counter clockwise

and assemble on the enginedrive pulley. Assem-

ble engine on muffler plate andsecure with three

bolts.

16. Release springtensionon idler pulleys and

assemble belt on drive shaft pulley. Reassemble

idlerpulleyspringand rotatethebelt several revolu-

tions. Check to make sure the belt iscenteredon

the’ pulleysand TURNING IN RIGHT DIRECTION.

Note directionof arrow onlarge pulley in illustra-

tion above.Check andadjust belt tension

necessary. Referto BELT TENSION ADJUSTMENT.

NOTE

When replacing either of the.

beltidler assemblies,useidler kit part

no. 682374for the top and kitpart no.

682564 onthebottom.

19-48

....

1983

SERVICE

BULLETIN

REFERENCES

2. Drive beltshould be checked to insure that

proper tensionexists inorder to prevent premature

belt failure. Lift floatingidler from theupper strand

“V”

belt. Belt will then become loose.Set

floating idler onto

“V”

belt and check clearance

between thetwostrands of the

“V”

belt. The

distance between the two strands should not be

less than 112” as shown.

complished by measuring the

distance

fromthe

front edge on the height adjuster brackets to the

1/4” diameter gage holes located directlyinfront

these bracketsas shown.This distance mustbe

the same for bothsides. Before tightening screws

makesure the distancebetweenthe strandsof the

“V”

beltisnot less than 112”. Tightenthefour

handlebracketscrewsandthe two sidescrews

securely.Reassemble beltguardto self-propel

mechanismusingscrewspreviously removed.’

SAFETY

WARNING

SAFETYWARNING: Do notoperate

mower with belt guard removed.

SERVICE

BULLETIN

REFERENCES 19-49

1983

SCAMPMODELS

REPLACEMENT AND SERVICING

SELF-PROPELLED DRIVE BELT

LUBRICATION

HOURS

1. DRIVEROLLER BEARINGS-Disassemble

rotating shaftcoverfromself-propelmechanismby

removing four screws. Unscrew plug from end of

each drive roller (Point“A”). Fillexposedcavitywith

EQUIVALENT.Replaceplugandtighten untilsnug.

Repeat procedureuntil lubricant appears oncross-

shaft at Point“B”. Reassemblerotating shaftcover

to self-propel assembly.

LAWN-BOY“A” GREASE,PART

NO.

610726

FOUR

PLACES

BOLT-PULLEY-ARM-NUT

LOWERIDLERASSEMBLY

PART #682564

LOWER IDLERPULLEY-Permanently lubricated.

lubrication required.

FLOATING IDLERPULLEY-Do not immerse the

idler pulleyinsolvent. Usea ragcontaining solvent,

clean the holeinthe idler pulleyand the shoulder

bolt thoroughly. Using a small amount of LAWN-

BOY “A” GREASEor EQUIVALENT,relubricatethe

shoulder boltand remount idler pulley assembly in

the same order it was originally.

ASREQUIRED

CLUTCH LINKAGE-Apply several dropsof light

machine oil on clutch mechanism at all pivoting

points.

19.50

...........................SERVICE BULLETIN REFERENCES

1983

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