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DR  COMMERICAL LEAF and LAWN VACUUM Safety & Operating Instructions 43
Symptom Possible Cause
The engine
lacks power or
is not running
smoothly.
(Please refer to
the engine
owner’s manual
for engine-
specific
procedures.)
⇒ Check the throttle travel. See page 24.
⇒ Is the choke pushed all the way to the left (RUN)? See
page 24.
⇒ Is the air filter clean? If it’s dirty, change it following the
procedure in the engine manufacturer’s owner’s
manual.
⇒ Is the spark plug clean? If it’s fouled or cracked,
change it. If it’s oily, leave it out, hold a rag over the
plug hole and pull your recoil cord several times to
blow out any oil in the cylinder, then wipe off the plug
and reinsert it.
⇒ Are you using fresh, clean unleaded gas? If it’s old,
change it. Use a fuel stabilizer if you keep gas longer
than one month.
⇒ Does your engine have the right amount of clean oil?
If it’s dirty, change it following the procedure in the
engine manufacturer’s owner’s manual.
⇒ Check the oil level and adjust as needed.
⇒ If your engine still lacks power, call 1(800) DR-
OWNER (376-9637) for assistance.
Engine smokes. ⇒ Check the oil level and adjust as needed.
⇒ 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 Manufacturer's
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.
Trailer wheels
tracking left or
right while being
towed.
⇒ Check the tire pressure. There should be 40 psi in
each tire.
Vibrations are
higher than
normal.
⇒ Check for Chipper Blade damage. See page 39.
Note: The Chipper Blade cannot be sharpened and must
be replaced if damaged.
WARNING! Before performing any maintenance procedure, stop the
engine and disconnect the spark plug wire.