Troubleshooting
3A5578C
33
Troubleshooting
To avoid injury from unexpected start up, disconnect
spark plug wire before you service your unit.
Problem
Cause
Solution
Cutters wearing
unevenly/prematurely
Drum is too low
Raise drum
Material build-up
Clean the cutters
Cutters too tightly loaded
Remove some spacers or cutters from shafts
Wrong cutters for application
See 17X074 (Surface Profile Chart)
Cutters shaft breakage
unevenly/prematurely
Drum is too low
Raise drum
End plates or bushings worn
Replace the end plates and/or bushings
Shafts worn
Replace the shafts
Wrong cutter set up
Visit
www.graco.com/drumassembly
for
proper setup
Over 40 hours service life
Replace shafts and bushings
Drum wearing prematurely
or cracking
Drum hitting ground
Raise drum
Shafts and bushings not replaced within 40
hours
Replace shafts and bushings
Excessive vibration
Bearing worn
Replace worn bearing
Hex bushing worn
Replace hex bushing
Drive shaft worn
Replace drive shaft
Improper cutter setup
Visit
www.graco.com/drumassembly
for
proper setup
Drum contacting ground
Raise drum
Wheels worn out
Replace wheels
Machine jumps erratically
Drum hitting ground
Raise drum
RPM is too low
Increase engine RPM
Surface is severely uneven
Move to smoother surface
Drive belt wearing prema-
turely
Pulley is misaligned
Align pulleys/belt. See page 29.
Wrong belt
Replace with correct belt
Drum is contacting the surface
Raise drum
Drum Engagement Lever will
not raise/lower
Drum Adjustment Dial is set too high or low.
Raise or lower Drum Adjustment Dial
Drum Adjustment Dial will
not turn
Threads are dirty or not greased.
Clean and grease the threads
Linkage may be bent
Replace linkage
Uneven cutting
Cutting too deeply
Raise drum
Rear wheel fork is bent
Replace rear wheel fork
