MTD 521 Operator's Manual page 9

,_ WARNING: Disconnect t he spark plug
wire and groundagainst the engine
before performingany adjustment,
repairsor maintenance.
Lubrication
Engine
Refertothe Engine Manual p acked withyouredgerfora
detailed description of all engine-related s ervicespecs.
Wheels
Lubricatethe wheelsand bearingsat least oncea
seasonwith a lightoil. Also if thewheels are removedfor
any reason,lubricatethe surfaceof the axle boltand the
inner surfaceof the wheelwith lightoil.
Pivot Points
Lubricatethe pivot pointson the blade controlbail and
bladedepthcontrol lever
Bearing Block
Lubricatethe bearingblock oncea season,or as needed
by simplyapplyingoil at eachend of thecover plate.
See Figure9.
F
Figure 10
3. Removethe spindlesheavesbelt guardby removing
the two self-tappingscrewswhich secureit to the
bladeplateassembly.
4. Usetwo wrenches(one wrenchto preventthehex
bolthead fromspinningand the otherto removethe
flangenut) to removethe edger blade.
Referto Figure11.
f
Flange Nut
\
Figure 9
Replacing the Edger Blade
,_ WARNING: The edger blade is sharp.
Wear leather work gloves to protect
your hands when working around the
-- edger blade.
_ WARNING: Disconnect t he spark plug
wire and ground against engine before
performingthe following steps.
1. Workingin front of the edger,loosentheflange lock
nuton top of frame,allowingthe idlerpulleyassembly
to pivot slightlyout from theframe.See Figure10.
2. With yourotherhand,carefullyreachunderthe
rear of the unitand removethe beltfrom aroundthe
engineflywheelpulley.
Belt
Guard
Figure 11
5. Removeand discardthe edgerblade but retainthe
flangenut.
6. Installthe replacementedgerblade and the flangenut
removed earlier.
IMPORTANT:Usea torquewrenchto tightenthe flange
nutto between37 foot-lbs,and 50 foot-lbs.
7. Reinstall t he spindlebeltguard with the self tapping
screwsremoved earlier.
8. Carefullyplacethe drivebelt backonto theengine
flywheelpulley,and retightentheflangelock nut on
the top of the frame.
IMPORTANT:Makecertainthat the drivebelt is
seatedcorrectlyon the blade spindleand that it is riding
smoothlyon the spindlesheavesand is notpinched
betweenthem.Repeatthe first threestepsif the beltis
9
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i i i i _ i
WARNING
The edger blade
is sharp. Wear
leather work gloves
to protect your hands
when workin g around
the edger blade
Disconnect the spark
plug wire and ground
against the engine
before performing
any adjustment,
repairs or mainte-
nance.