DR Pro 475 Safety & Operating Instructions Manual page 38

Troubleshooting Table (continued)
Shut down the Engine (The flywheel will continue to rotate for a while after the engine is shut off), Wait 5 minutes for the engine
to cool and all moving parts to come to a complete stop, remove spark plug wire and disconnect the negative battery cable before
moving or working on the chipper.
S
YMPTOM
Chipping action seems
too slow or flywheel
stalls.
The belt frays or rolls
over the pulley.
- Clutch overheats.
- Belt burns.
-
Flywheel won't turn.
The machine has
excessive vibration.
When chipping, the log
seems to vibrate
excessively and
"hammers" my hands.
Material does not feed
as well.
Chipper Knife is hitting
the Wear Plate.
Engine runs but the
flywheel doesn't rotate.
DR ®
38 SELF-FEEDING WOOD CHIPPER
P C
OSSIBLE AUSE
 The engine speed is too slow causing the belt to slip. Run the engine at full throttle.
 Check for loose or damaged Drive Belt; tighten or replace. See Chapter 4.
 Check for a dull or damaged Knife; sharpen or replace the Knife. See Chapter 4.
 The rotor Drive Pulley groove may be nicked. Check the Drive Belt for wear and hard spots. File
off any nicks on the pulley.
 The Drive Belt may be stretched; replace it. See Chapter 4.
 The Pulleys may be misaligned. See Chapter 4.
 Immediately stop the engine and disconnect the spark plug wire.
 Turn the Flywheel with a wooden stick to be sure it turns freely.
 Check for a loose Drive Belt. See Chapter 4.
 Remove any built-up debris from the Chipper Hopper Inlet and Discharge Chute.
 Check for a dull or damaged Knife; sharpen or replace the Knife. See Chapter 4.
 Check the Knife to Wear Plate Gap. See Chapter 4.
 The Knife is not properly seated on the flywheel. Loosen the Knife mounting screws, reset the
Knife and tighten the screws.
 If the machine still exhibits excessive vibration, contact us at www.DRpower.com or call 1(800)
DR-OWNER (376-9637) for assistance.
 The Knife is dull; sharpen or replace it. See Chapter 4.
 The gap between the Knife and Wear Plate is too great; adjust the Gap. See Chapter 4.
 Check Engine rpms; run Engine at full throttle when chipping.
 The Knife is dull; sharpen or replace it. See Chapter 4.
 Check Engine rpms; run Engine at full throttle when chipping.
 The gap between the Knife and the Wear Plate is set incorrectly; adjust the Knife to Wear Plate
Gap. See Chapter 4.
 The inner Shoes of the Clutch are worn. Replace worn or broken Clutch parts. See Chapter 5.
 Loose Drive Belt; adjust the Drive Belt tension. See Chapter 4.
 Remove any built-up debris from the Chipper Hopper Inlet and Discharge Chute.