Service - MTD 520 Series Operator's Manual

Service

Maintenance
WARNING: Always stop engine, allow
engine to cool, disconnect spark plug,
and ground against engine before
performing any type of maintenance on
your machine.
Engine
Refer to the Engine Operator's Manual for a
detailed description of all engine-related service
specifications.
Edger Blade
WARNING! The edger blade is sharp.
Wear leather work gloves to protect your
hands when working around the edger
blade.
1. 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 4-1 for 550 series
edgers equipped with tri star blade. Refer to
Figure 4-2 for 520 series edgers equipped with
standard edger blade.
Flat Washer
Edger
Blade
Figure 4-1
Edger Blade
Figure 4-2
2. Remove and discard the edger blade but
retain the flange nut.
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3. Install the replacement edger blade and the
flange nut removed in Step 2. Use a torque
wrench to tighten the flange nut to between
37 ft-lb and 50 ft-lb.
NOTE: 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
Steps 1 and 3 to adjust if belt is pinched.
Lubrication
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, blade
depth control lever, the bevel adjustment lever, and
curb height adjustment lever with light oil at least
once a season. Refer to page 8 for the location of
these controls.
Bearing Block
Lubricate the bearing block every 25 hours or at least
once a season. Simply apply oil at each end of the
cover plate. See Figure 4-3.
Flange Nut
Belt Replacement
Drive Belt
To aid in reassembly, note the orientation
NOTE:
of the drive belt on the two idler pulleys and
Flange
the engine flywheel pulley prior to performing
Nut
the following steps. Refer to Figure 4-4.
Lubricate
Figure 4-3
The edger drive belt is subject to wear and should be
replaced if any signs of cracking, shredding or rotting
are present. To replace the belt, proceed as follows:
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 4-4.
Flange
Lock Nut
Engine
Flywheel
Pulley
Figure 4-4
2. With your other hand, carefully reach under
the rear of the edger and remove the belt from
around the engine flywheel pulley. See Figure 4-4.
3. Remove the spindle sheaves belt guard by
removing the two self-tapping screws (a)
which secure it to the blade plate assembly.
See Figure 4-5.
4. Carefully remove the belt from off of the pulleys,
again making sure to note the orientation of the
belt. Discard the belt. See Figure 4-5.
5. Working from the front of the edger, place the
belt onto the spindle sheaves, route it back
onto the two idler pulleys, and then place it
onto the engine flywheel pulley.
NOTE: Make certain that the "V" side of the
belt is seated into the top pulley and the flat
side of the belt is seated into the bottom
pulley. See Figure 4-5.
6. Reinstall the spindle sheaves belt guard with
the self tapping screws (a) removed in Step 3.
7. Make certain that the drive belt is on the engine
flywheel pulley and idler pulleys, and retighten
the flange lock nut on the top of the frame.
Belt Guard
(a)
(a)
(a)
(a)
Engine Flywheel Pulley
Figure 4-5
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