MTD 248-650-000 - Manual (Page 9)

MAINTENANCE
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WARNING {
Disconnect spark plug wire and ground
it against the engine before performing
any repairs or maintenance.
ENGINE
Refer to the separate engine manual packed with your
unit for all engine maintenance procedures. Read
instructions carefully.
AIR CLEANER
The air cleaner prevents damaging dirt, dust, etc., from
entering the carburetor and being forced into the engine
and is important to engine life and performance.
Never run your engine without air cleaner completely
assembled.
To service air cleaner; refer to the separate engine
manual packed with your unit.
LUBRICATION
Wheels - The wheels require no lubrication.
Flails and Fingers - If the unit is disassembled for any
reason, lubricate the flails and fingers with a light oil
(engine oil may be used).
CUTTING blade
The cutting blade may be removed for grinding or
replacement as follows.
1. Lower the upper guide extension.
2. Block up the housing. See figure 15.
3. Remove the four elastic lock nuts from the back
of the housing using a 1/2" wrench. Refer to figure
13. Separate the shredder into two halves.
4. Remove the back-up plate. See figure 15.
5.
6
.
Hold the blade retainer on the impeller assembly
with an adjustable wrench to keep the blade from
turning as shown in figure 15.
Remove 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
protruding from the housing.
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WARNING
The blade is reversible and can be
assembled to the crankshaft with either
side showing.
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 tp
prevent an unbalanced blade. An unbalanced blade will
cause excessive vibration whèn rotating at high speeds
and may cause damage to the unit.
The blade can be tested by balancing it on a round shaft
screwdriver or nail. Remove metal from the heavy side
until it balanced evenly. See figure 16.
NOTE
When reassembling, make certain the
opening on the back-up plate is toward
the bottom of the unit. The back-up plate
may be reversed to provide a new cutting
edge.