6-789A
6
Rev. 08/29/19
TROUBLESHOOTING
IMPACT WRENCHES
TOOL DOES NOT RUN OR RUNS SLOWLY, AND/OR
AIR FLOWS ONLY SLIGHTLY FROM EXHAUST
—
This condition is probably caused by insuf-
ficient air pressure, contaminants blocking
the airflow or operation of motor parts, or
a power regulator which has vibrated to a
closed position.
YOU SHOULD:
Check the air supply for suffi-
cient pressure. Check the air inlet strainer for
blockage. Pour a generous amount of air tool
oil into air inlet. Operate tool in short bursts,
in both forward and reverse directions.
Repeat if necessary. If tool performance
does not improve, the tool should be serviced
by an authorized service center.
TOOL WILL NOT RUN, EXHAUST
AIR FLOWS FREELY.
This condition is probably
caused by one or more rotor vanes stuck on
ac cu mu la ted sludge or varnish; motor rusted.
YOU SHOULD:
Pour a generous amount of air
tool oil into air inlet. Operate tool in short
bursts in both forward and reverse directions.
Lightly tap the motor housing with a plastic
mallet. Detach the air supply. Try to free the
motor by turning the drive shaft manually,
if possible. If the tool remains jammed, it
should be serviced by an authorized service
center.
SOCKETS WILL NOT STAY ON.
This condition is
probably caused by a worn socket retainer
ring or a soft backup o-ring
YOU SHOULD:
Wear safety goggles. Detach
the air supply. Using external retaining ring
pliers, remove the old retaining ring. While
holding the square drive with an appropriate
wrench, use a small screwdriver to pry old
retainer ring out of its groove. Always pry the
ring away from your body, because it can be
propelled outward at high velocity. Replace
the backup o-ring and retainer ring with cor-
rect new parts (see breakdown). Place the
retaining ring on a table and press the tool
anvil into the ring with a rocking motion. Snap
the ring into the groove by hand.
PREMATURE ANVIL WEAR.
This is probably
cased by using chromed sockets, which are
not designed for use with impact tools, or
worn sockets
YOU SHOULD:
Stop using chrome sockets.
Chrome sockets have a hard exterior surface
and a soft core, which leads to a warped but
very hard drive hole when used with impact
tools. Chrome sockets will wear wrench
anvils quickly and present a danger of split-
ting or breakage which can lead to injury or
death.
TOOL SLOWLY LOSES POWER BUT RUNS AT FULL
SPEED WHEN NOT UNDER LOAD.
This condition is
probably caused by worn clutch parts, inad-
equate lubrication, or worn engaging cam.
YOU SHOULD: FOR OIL LUBED WRENCHES:
Check
for presence of clutch oil (where oil is speci-
fied for the clutch) and remove oil fill plug.
Tilt to drain all of the oil from the clutch case.
Refill the case with NAPA air tool oil or that
recommended by the manufacturer in the
specified amount. Also check for excess
clutch oil. Clutch cases only need to be
filled 50%, and overfilling can cause drag on
high speed clutch parts. A typical 1/2" Drive
oil lubed wrench only requires 1/2 ounce
of clutch oil.
FOR GREASE LUBED WRENCHES:
Check for excess grease by rotating drive
shaft by hand. It should rotate freely, and
excess grease is usually expelled automati-
cally.
TOOL WILL NOT SHUT OFF.
This condition is
probably cause by a broken or maligned
throttle valve O-ring, or a bent or jammed
throttle valve stem.
YOU SHOULD:
Remove the throttle assem-
bly and install a new o-ring. Lubricate the
assembly with air tool oil and operate the trig-
ger briskly. If operation cannot be restored,
the tool should be serviced at an authorized
service center.
AIR RATCHETS
MOTOR RUNS. SPINDLE DOESN'T TURN, OR TURNS
ERRATICALLY
—This condition is probably
caused by worn teeth on the ratchet or pawl,
a broken or weak pawl pressure spring, or
weak drag springs which fail to hold the
spindle while the pawl advances.
YOU SHOULD:
Have replacement parts installed
by an authorized service center.
TOOL DOESN’T RUN, RATCHET HEAD INDEXES
CRISPLY BY HAND—
This condition is probably
caused by the accumulation of dirt or sludge
in motor parts.
YOU SHOULD:
Pour a generous amount of air
tool oil into the air inlet. Operate the throttle
in short bursts. With the tool engaged on a
bolt, alternately tighten and loosen the bolt by
hand. If the tool remains jammed, it should
be serviced at an authorized service center
AIR DRILLS
TOOL WILL NOT RUN, RUNS SLOWLY, AIR FLOWS
SLIGHTLY FROM EXHAUST, SPINDLE TURNS FREELY
—
This condition is probably caused by a
blocked air passage or jammed motor parts.
YOU SHOULD:
Check the air inlet for block-
ages. Pour a generous amount of air tool
oil into air inlet. Operate the trigger in short
bursts. Detach the air supply. Turn the empty
and closed drill chuck by hand. Reconnect
air supply. If the tool’s performance does not
improve, it should be serviced by an autho-
rized service center.
TOOL WILL NOT RUN. AIR FLOWS FREELY FROM
EXHAUST. SPINDLE TURNS FREELY.
This condi-
tion is prob a bly caused by a broken rotor
vane or jammed or broken gears.
YOU SHOULD:
Pour a generous amount of air
tool oil into air inlet. Operate the trigger in
short bursts. Detach the air supply. Turn
the empty and closed drill chuck by hand.
Reconnect air supply. If the tool’s perfor-
mance does not improve, it should be ser-
viced by an authorized service center.
TOOL SEIZED. SPINDLE WILL NOT
TURN —
This condition is probably caused
by a broken rotor vane or jammed or broken
gears.
YOU SHOULD:
Have the tool serviced by an
authorized service center.
TOOL WILL NOT SHUT OFF —
The throttle
valve o-ring has probably come unseated.
YOU SHOULD:
Replace the o-ring (see
breakdown) or have tool serviced by an
authorized service center.
AIR HAMMERS
TOOL WILL NOT RUN —
This condition is
probably caused by a clogged cycling valve
or throttle valve.
YOU SHOULD:
Check the air inlet for block-
ages. Pour a generous amount of
air tool oil into air inlet. Operate the trig-
ger in short bursts with the chisel in place
and against a solid surface. Detach the air
supply. Tap the nose or barrel lightly with a
plastic mallet, reconnect the air supply, and
repeat above steps. If the tool is still seized,
insert a 6" piece of 1/8" diameter rod in the
nozzle and lightly tap to loosen the piston in
the rear direction. Reconnect air supply and
repeat above steps.
CHISEL STUCK IN NOZZLE—
This condi-
tion is probably caused by a deformed shank.
YOU SHOULD:
Have tool serviced by an
authorized service center.
NOTE: DISASSEMBLY OF THIS TOOL
BY ANY OTHER THAN AN AUTHORIZED
SERVICE CENTER WILL VOID THE
WARRANTY ON THIS TOOL.
SANDERS/GRINDERS
TOOL HAS NO POWER OR RUNS SLOWLY.
This
condition is probably caused by insufficient
air pressure, contaminants blocking the air
flow, or speed regulator that has vibrated to a
closed or off position.
YOU SHOULD:
Check the air supply at the com-
pressor and air lines to the tool for sufficient
air pressure. Check the air inlet strainer for
blockage and make sure speed regulator is
in the open or on position. If power is not
restored the tool should be serviced by an
authorized service center.
TOOL SEIZED. PAD/SPINDLE WILL NOT TURN.
This
condition is probably caused by a broken
rotor vane, jammed or broken gears, or
seized bearing.
YOU SHOULD:
Have the tool repaired by an
authorized service center
.
TOOL WILL NOT SHUT OFF/RUNS CONTINUOUSLY.
The throttle valve seat has become loose or
damaged.
YOU SHOULD:
Replace o-ring or valve seat
(see breakdown for proper parts) or have tool
serviced by an authorized service center.
SANDS/GRINDS UNEVENLY.
This
condition is usually caused by loose pad/disc
connection or worn or damaged pad/disc.
YOU SHOULD:
Check pad/disc connection,
ensure that connection is secure and tight.
Replace worn or damaged pad/disc.
