Section 6: Making Adjustments; Cutting Height - MTD 979K Operator's Manual

21" self-propelled mower
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For a healthy lawn, always cut off one-third or less
of the total length of the grass. Lawn should be
trimmed in fall as long as there is growth.
IMPORTANT: Move the shift lever only when the engine
is running. Changing the shift lever setting with the
engine off can cause damage to the mower.
WARNING"
If the mower strikes a foreign
object, stop the engine. Remove spark plug
wire from the spark plug and thoroughly inspect
for any damage. Repair the damage promptly
before restarting and operating the mower.
Mulching
For effective mulching, do not cut wet grass. New or
thick grass may require a narrower cut. If the grass has
grown in excess of 4", mulching is not recommended.
Mow using the side discharge to reduce the grass
height to 3.25" maximum before mulching.
Bagging GrassClippings
You can use the grass catcher bag to collect clippings
while you are operating the mower.
Attach grass catcher following instructions on page
8 of this manual. Grass clippings will automatically
collect in the bag as you run the mower.
Operate the mower till the grass bag is full.
Stop engine completely by releasing the blade
control handle. Make sure that the unit has come to
a complete stop.
While holding the grass bag by both the rear handle
and the lower handle, lift the grass bag straight up
off the adapter. The chute door will move the rope
out of the way of the bag.
Continue to hold the lower handle and raise the
rear of the grass bag up toward your chest. The
grass bag will open and the grass clippings will
disperse.
When replacing the grass bag, be sure the top of
the bag rests on the wire support between the
handles.
SECTION 6: MAKING ADJUSTMENTS
WARNING"
Do not at any time make any
adjustments without first stopping engine and
disconnecting spark plug wire.
Cutting Height
Your mower is shipped with the cutting height in the
lowest position. The cutting height adjustment lever is
located above the left rear wheel. To adjust the cutting
height, proceed as follows:
Pull the lever out and away from the mower and
then move it forward or backward to another slot.
See Figure 10.
NOTE: For rough or uneven lawns, move the height
adjustment lever to a higher position. This will help stop
scalping.
Cutting Height
Adjustment Lever
Figure 10
11
DriveClutchControl
The adjustment wheel is located in the drive clutch
control handle housing and is used to tighten or loosen
the drive belt. You will have to adjust the drive clutch
control if any of the following happens:
1.
The mower does not propel itself with the drive
clutch engaged.
2.
The mower's drive wheels hesitate with the drive
clutch engaged.
To resolve the above problems, rotate the
adjustment wheel with your fingers: clockwise to
tighten the cable and counter-clockwise
to loosen
the cable. See Figure 11.
Bottom View
®
®
Jpper
Adjustment
Handle
Shift Lever
Figure 11
Drive Clutch
Control
NOTE: For some people the drive dutch control may
not be in a comfortable position.
You can adjust the
handle out by tightening the adjustment wheel.

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