Exmark METRO 21 MPKA21 - Manual (Page 31)

Maintenance
Adjustments
Note: Wait for all moving parts to stop and remove
spark plug wire before servicing, cleaning, or making
any adjustments to the unit.
Adjusting the Self-Propel
Drive
(Self-Propelled Units Only)
If the lawn mower does not self-propel or has a
tendency to creep forward when the control bar is
released, adjust the wheel drive control knob on the
rear of the gear box.
1. Close the door in the lawn mower housing and
remove the grass bag.
2. If the lawn mower does not self propel, rotate
the control knob clockwise 1/2 turn to tighten
the belt.
If the lawn mower creeps forward, rotate the
knob 1/2 turn counterclockwise to loosen the belt
Figure 30
1. Control knob
Adjusting the Blade Brake
Cable
Service Interval: Every 100 hours
Adjust whenever a new blade brake cable assembly
is installed.
1. Stop the engine and wait for all moving parts to
stop.
2. Disconnect the wire from the spark plug.
• For Blade Brake Clutch Units:
1. Loosen the cable clamp screw until the cable
conduit slides (see Figure 31).
Figure 31
1. Spring 3. Cable clamp screw
2. Cable conduit
2. Pull the cable to remove the slack, but Do
Not put tension on the spring.
3. Tighten the screw to lock the adjustment in
place.
4. Connect the wire to the spark plug.
• For Self-Propelled Units without a Blade
Brake Clutch:
1. Loosen the nut on the cable bracket (see
Figure 31).
2. Insert a 3/16 to 1/4 inch (5 to 6 mm) object
between the brake control lever and the
handle.
3. Turn the cable adjuster on the brake cable
until you remove the slack.
4. Tighten the jam nut.
5. Connect the wire to the spark plug.
• For Hand-Push Units:
1. Loosen the jam nut on the blade brake cable
clamp (see Figure 31).
2. Insert a 3/16 to 1/4 inch. (5 to 6 mm) object
between the brake control lever and the
handle. Pull down on the cable conduit until
you remove the slack from the wire.
3. Tighten the nut.
4. Connect the wire to the spark plug.
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