DR 18 HP Safety & Operating Instructions Manual page 52

BEFORE PERFORMING ANY MAINTENANCE PROCEDURE OR INSPECTION, STOP THE ENGINE, WAIT
FIVE (5) MINUTES TO ALLOW ALL MOVING PARTS TO COME TO A COMPLETE STOP AND COOL.
DISCONNECT THE SPARK PLUG WIRES, KEEPING THEM AWAY FROM THE SPARK PLUGS.
S
YMPTOM
The engine lacks
power or is not
running smoothly.
(Please refer to the
Engine Owner's
Manual for engine-
specific procedures.)
Engine smokes.
Chipping action
seems too slow or
flywheel stalling.
The belt frays or
rolls over the pulley.
- Clutch overheats.
- Belt burns.
- Flywheel won't
turn.
®
DR
48 18 and 19 HP ROAD-TOWABLE CHIPPER
P C
OSSIBLE AUSE
⇒ Check the Throttle Lever travel and adjustment. Is the Throttle Lever in the Run
position?
⇒ Is the Choke lever pushed all the way IN to the RUN position? See page 26.
⇒ Is the air filter clean? If it's dirty, change it following the procedure in the Engine
Owner's Manual.
⇒ Are the spark plugs clean? If they are fouled or cracked, change them. If they are
oily, leave them out, hold a rag over the spark plug holes and engage the electric
starter for a few seconds to blow out any oil in the cylinders, then wipe off the
spark plugs and reinsert them.
⇒ Are you using fresh, clean unleaded gas? If it's old, change it. Use a fuel stabilizer
if you keep gas longer than two weeks or so.
⇒ Does your engine have the right amount of clean oil? If it's dirty, change it
following the procedure on page 33.
⇒
If your engine still lacks power, call 1(800) DR-OWNER (376-9637) for assistance.
⇒ Check the oil level and adjust as needed.
⇒ You may be operating the machine on too great an incline. The machine should
be level.
⇒ Check the air filter and clean or replace if needed.
⇒ You may be using the wrong oil - too light for the temperature. Refer to your
Engine Owner's Manual for detailed information.
⇒ Clean the engine cooling fins and the carburetor housing if they're dirty.
⇒ If the engine still smokes, call 1(800) DR-OWNER (376-9637) for assistance.
⇒ The engine speed is too slow causing the belt to slip. Run the engine at full
throttle.
⇒
Check for loose or damaged Drive Belts; tighten or replace. See page 35.
⇒
Check for a dull or damaged Knife; sharpen or replace the Knife. See page 38.
⇒ The rotor Drive Pulley groove may be nicked. Check the Drive Belts for wear and
hard spots. File off any nicks on the pulley.
⇒
The Drive Belts may be stretched; replace them. See page 35.
⇒ Immediately stop the engine and disconnect the spark plug wires.
⇒ Turn the flywheel with a wooden stick to be sure it turns freely.
⇒ Check the Drive Belt tension. See page 35.
⇒
Remove any built-up debris from the Chipper Hopper Inlet and Discharge Chute.