Napa 6-787 Mode D'emploi page 5

TROUBLESHOOTING
IMPACT WRENCHES
TOOL DOES NOT RUN OR RUNS
SLOWLY, AND/OR AIR FLOWS
ONLY SLIGHTLY FROM EXHAUST.
This condition is probably caused
by insufficient 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 sufficient 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 accumulated
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
correct new parts (see breakdown).
PLEASE REVIEW ALL WARNING INSTRUCTIONS PRIOR TO OPERATION. SAVE THIS MAN U AL FOR FUTURE REF ER ENCE.
6-787
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 caused 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 splitting
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, inadequate lubrication, or
worn engaging cam.
YOU SHOULD:
FOR OIL LUBED WRENCHES:
Check for presence of clutch oil
(where oil is specified 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 oz.
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
automatically.
TOOL WILL NOT SHUT OFF. This
condition is probably caused by a
broken or maligned throttle valve
O-ring, or a bent or jammed
throttle valve stem.
YOU SHOULD: Remove the
throttle assembly and install a
new o-ring. Lubricate the assembly
with air tool oil and operate the
trigger briskly. If operation cannot
5
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 blockages. 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 authorized service center.
TOOL WILL NOT RUN. AIR FLOWS
FREELY FROM EXHAUST. SPINDLE
TURNS FREELY. This condition is
probably 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
Rev. 06/02/16