Troy-Bilt TB25CB - The Cutting Head will Not Advance Line (for Bump Heads Only); The Cutting Line Advances Uncontrollably (for Bump Heads Only)

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PROBLEM SOLUTION
If further assistance is required, contact an authorized service center.
THE CUTTING HEAD WILL NOT ADVANCE LINE (FOR BUMP HEADS ONLY)
The cutting head is bound with grass Stop the engine and clean the cutting head
The cutting head is out of line Rell the cutting head with new line
The inner reel is bound up Rewind the line
The cutting head is dirty Clean the inner reel and outer spool
The line is welded
Open the cutting head and remove the welded
section
The line is twisted Rewind the line
Not enough line is extended
Stop the unit, push the bump knob and pull the
line until 4 inches (102 mm) is outside of the
cutting head
THE CUTTING LINE ADVANCES UNCONTROLLABLY (FOR BUMP HEADS ONLY)
There is oil, cleaner or lubricant in the cutting head Clean and thoroughly dry the cutting head