Maintaining & Servicing - MTD Series 520 Operator's Manual

WARNING: Disconnect the spark plug
wire and ground against the engine
before performing any adjustment,
repairs or maintenance.
Lubrication
Engine
Refer to the Engine Manual packed with your edger for a
detailed description of all engine-related service specs.
Wheels
Lubricate the wheels and bearings at least once a
season with a light oil. Also if the wheels are removed for
any reason, lubricate the surface of the axle bolt and the
inner surface of the wheel with light oil.
Pivot Points
Lubricate the pivot points on the blade control bail, blade
depth control lever, and if applicable, the blade adjust-
ment lever, and curb height adjustment lever with light oil
at least once a season.
Bearing Block
Lubricate the bearing block once a season, or as needed
by simply applying oil at each end of the cover plate.
See Figure 9.
Model 550
shown here
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 the spark plug
wire and ground against engine before
performing the following steps.
1. Working in front of the edger, loosen the flange lock
nut on top of frame, allowing the idler pulley assembly
to pivot slightly out from the frame. See Figure 10.
Engine
Flywheel
Pulley
Flat Side
of Belt
2. With your other hand, carefully reach under the rear of
the unit and remove the belt from around the engine
flywheel pulley.
3. Remove the spindle sheaves belt guard by removing
the two self-tapping screws which secure it to the
blade plate assembly.
4. Use two wrenches (one wrench to prevent the hex
bolt head from spinning and the other to remove the
flange nut) to remove the edger blade.
Refer to Figure 11.
Hex Bolt Head
5. Remove and discard the edger blade but retain the
Lubricate
flange nut.
6. Install the replacement edger blade and the flange nut
removed earlier.
IMPORTANT: Use a torque wrench to tighten the flange
nut to between 37 foot-lbs. and 50 foot-lbs.
7. Reinstall the spindle belt guard with the self tapping
screws removed earlier.
8. Carefully place the drive belt back onto the engine
flywheel pulley, and retighten the flange lock nut on
the top of the frame.
IMPORTANT: Make certain that the drive belt is
seated correctly on the blade spindle and that it is riding
smoothly on the spindle sheaves and is not pinched
between them. Repeat the first three steps if the belt is
pinched.
11
Flange Lock Nut
Idler Pulley
"V" Side
Assembly
of Belt
Figure 10
Flange Nut
Figure 11
7
Maintaining
& Servicing
Belt
Guard
WARNING
The edger blade
is sharp. Wear
leather work gloves
to protect your hands
when working around
the edger blade
Disconnect the spark
plug wire and ground
against the engine
before performing
any adjustment,
repairs or mainte-
nance.