Exmark METRO 21 Operator's Manual page 37

Problem
Lawn mower does not self-propel
(Self-Propelled Models Only)
Possible Cause
1. The self-propel drive cable is out of
adjustment or is damaged.
2. There is debris under the belt cover.
37
Troubleshooting
Corrective Action
1. Adjust the self-propel drive cable. Replace
the cable if necessary.
2. Clean the debris from under the belt
cover.