Napa 6-798 User manual

6-798 1 rev. 11/19/01
This insTrucTion
Manual conTains
iMporTanT safeTy
inforMaTion
read carefully and
undersTand
all inforMaTion
Before operaTing
This Tool!
save This Manual
for fuTure reference.
1" DRIVE MINI SUPER DUTY
IMPACT
WRENCH w/6" Ext. Anvil 6-798
®
®
Some dust created by power sanding, sawing, grinding, drilling,
and other construction activities contains chemicals known to
cause cancer, birth defects or other reproductive harm. Some
examples of these chemicals are:
• lead from lead-based paints,
• crystalline silica from bricks and cement
and other masonry products, and
• arsenic and chromium from
chemically-treated lumber.
Your risk from these exposures varies, depending on how
often you do this type of work. To reduce your exposure to
these chemicals: work in a well ventilated area, and work with
approved safety equipment, such as those dust masks that are
specially designed to filter out microscopic particles.

▲WARNING!
FAILURE TO OBSERVE THESE WARNINGS COULD RESULT IN INJURY.
This insTrucTion Manual
conTains iMporTanT safeTy
inforMaTion.
read This insTruc-
Tion Manual care-
fully and under-
sTand all inforMa-
Tion Before operaT-
ing This Tool.
• Always operate, inspect and
maintain this tool in accor-
dance with American Nation-
al Standards Institute Safety
Code of Portable Air Tools
(ANSI B186.1) and any other
applicable safety codes and
regulations.
• For safety, top performance
and maximum durability of
parts, operate this tool at 90
psig 6.2 bar max air pressure
with 1⁄2" diameter air supply
hose.
• Always wear impact-resistant
eye and face protection when
operating or performing main-
tenance on this tool. Always
wear hearing protection when
using this tool.
• High sound levels can cause
permanent hearing loss. Use
hearing protection as recom-
mended by your employer or
OSHA regulation.
• Keep the tool in efficient oper-
ating condition.
• Operators and maintenance
personnel must be physical-
ly able to handle the bulk,
weight and power of this
tool.
• Air under pressure can
cause severe injury. Never
direct air at yourself or others.
Always turn off the air supply,
drain hose of air pressure and
detach tool from air supply
before installing, removing or
adjusting any accessory on this
tool, or before performing
any maintenance on this tool.
Failure to do so could result in
injury. Whip hoses can cause
serious injury. Always check
for damaged, frayed or loose
hoses and fittings, and replace
immediately. Do not use quick
detach couplings at tool. See
instructions for correct set-up.
• Air powered tools can vibrate
in use. Vibration, repetitive
motions or uncomfortable
positions over extended peri-
ods of time may be harmful
to your hands and arms. Dis-
continue use of tool if discom-
fort, tingling feeling or pain
occurs. Seek medical advice
before resuming use.
• Place the tool on the work
before starting the tool. Do
not point or indulge in any
horseplay with this tool.
• Slipping, tripping and/or fall-
ing while operating air tools
can be a major cause of seri-
ous injury or death. Be aware
of excess hose left on the walk-
ing or work surface.
• Keep body working stance
balanced and firm. Do not
overreach when operating the
tool.
• Anticipate and be alert for sud-
den changes in motion during
start up and operation of any
power tool.
• Do not carry tool by the hose.
Protect the hose from sharp
objects and heat.
• Tool shaft may continue to
rotate briefly after throttle is
released. Avoid direct contact
with accessories during and
after use. Gloves will reduce
the risk of cuts or burns.
• Keep away from rotating end
of tool. Do not wear jewelry
or loose clothing. Secure long
hair. Scalping can occur if hair
is not kept away from tool
and accessories. Choking can
occur if neckwear is not kept
away from tool and accesso-
ries.
• Do not lubricate tools with
flammable or volatile liquids
such as kerosene, diesel or jet
fuel.
• Impact wrenches are not
torque control devices. Fas-
teners with specific torque
requirements must be checked
with suitable torque measur-
ing devices after installation
with an impact wrench.
• Use only impact wrench sock-
ets and accessories on this
tool. Do not use hand sockets
and accessories.
• Don't force tool beyond its rat-
ed capacity.
• Do not remove any labels.
Replace any damaged labels.
• Use accessories recommend-
ed by NAPA Professional Air
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2

6-798 3 rev. 11/19/01
AIR SUPPLY
Lubricate the air motor daily
with NAPA air tool oil. If no
air line oiler is used, run a tea-
spoon of oil through the tool.
The oil can be squirted into the
tool air inlet or into the hose at
the nearest connection to the
air supply, then run the tool.
The oil plug is ONLY for adding
standard SAE 10 or 20 grade
oil after repair or maintenance
of the impact mechanism. The
amount of oil to be used is 1
LUBRICATION
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ounce. Overfilling will cause a
reduction in the power of the
tool.
3
Tools of this class operate on
a wide range of air pressures.
It is recommended that air
pressure of these tools mea-
sure 90 PSI at the tool while
running free. Low pressure
(under 90 psig; 6/2bar) reduc-
es the speed of all air tools.
Low air pressure not only
wastes time, but also costs
money. Higher pressure (over
90 psig; 6/2 bar) raises per-
formance beyond the rated
viewed in the above figure.
The air inlet used for con-
necting air supply, has stan-
dard 1/2" NPT American
Thread. Line pressure should
be increased to compensate
for unusually long air hoses
(over 25 feet). Minimum hose
diameter should be 1/2" I.D.
and fittings should have the
same inside dimensions and
be tightly secured.
capacity of the tool which
will shorten the tool’s life
because of faster wear and
could cause injury.
Always use clean, dry air.
Dust, corrosive fumes and/
or water in the air line will
cause damage to the tool.
Drain the air tank daily.
Clean the air inlet filter
screen on at least a weekly
schedule. The recommended
hookup procedure can be

PARTS BREAKDOWN
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6
6-798
52
49
50
51
48
47
19
46
45
39 38 54
44
43
42 33
32
4140
36
38
35
34
6
55
5
3
2
13
12
14
15
9
8
19
753
120
15
11 16
10 17 22 23 24 18
21
25 26 27 28 29 30
31
4

OPERATION
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This impact wrench is rated
at 1" USS bolt size. Rating
must be down graded for
spring U bolts, tie bolts,
long cap screws, double
depth nuts, badly rusted
conditions and spring fas-
teners as they absorb much
of the impact power. When
possible, clamp or wedge
the bolt to prevent spring-
back.
Soak rusted nuts in pene-
trating oil and break rust
seal before removing with
impact wrench. If nut does
not start to move in three
to five seconds use a larger
size impact wrench. Do not
use impact wrench beyond
rated capacity as this will
drastically reduce tool life.
4
Drive ................................. 1"
Torque Range ...................150-1200 ft./lbs.
Max. Torque ....................1500 ft./lbs.
Overall Length .................19.5"
Net Wt. ............................18.5 LBS.
Avg. Air Cons. ..................9 CFM
Air Inlet ............................1/2"NPT
Min. Hose Size .................1/2" ID
Recom.. Air Pressure ........90 PSIG
Free Speed ........................4000 RPM
Sound Level ......................97 dBA
SpecificationS
The reversing lever is used
to change the rotation of
the tool. When the valve is
pushed to the left, the tool
is in a forward or right hand
rotation. When the valve is
pushed to the right, the rota-
tion is reverse or left hand.
NOTE: Actual torque on a
fastener is directly related to
joint hardness, tool speed,
condition of socket and the
time the tool is allowed to
impact.
Use the simplest possible
tool-to-socket hook up. Every
connection absorbs energy
and reduces power.
Air Inlet
Forward/Reverse
Lever
®

6-798 7 rev. 11/19/01
TROUBLESHOOTING
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iMpacT Wrenches
TOOL RUNS SLOWLY OR NOT AT ALL AND/OR AIR FLOWS ONLY SLIGHTLY FROM EXHAUST — This is probably caused by: air flow
blocked by dirt build-up; motor parts jammed with dirt; power regulator has vibrated to closed position.
you should: Check 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 motion. Repeat if necessary. If tool performance is not improved, it should be serviced
at an authorized service center.
Tool Will noT run, exhausT air floWs freely. This is probably caused by one or more motor vanes stuck due to accumula-
tion of 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
motion. Lightly tap motor housing with plastic mallet. Detach air supply. Try to free motor by turning drive shank manually,
if possible. If tool remains jammed, it should be serviced at authorized service center.
sockeTs Will noT sTay on. This is probably caused by: worn socket retainer ring or soft back-up ring.
you should: Wear safety goggles. Detach air supply. Using external retaining ring pliers, remove old retaining ring. Holding
square drive with appropriate open-end wrench, use small screwdriver to pry old retainer ring out of groove. Always pry
off ring away from your body - it can be propelled outward at high velocity. Replace back-up O-ring and retainer ring with
correct new parts. (see breakdown). Place retaining ring on table, press tool anvil into ring in a rocking motion. Snap into
groove by hand.
preMaTure anvil Wear. This is probably caused by: use of chrome sockets or worn sockets.
you should: Stop using chrome sockets. Chrome sockets have a hard surface and a soft core. Drive hole becomes rounded - but
will still be very hard. Besides the danger of splitting, wrench anvils will wear out prematurely when used with chrome sock-
ets.
Tool sloWly loses poWer BuT sTill runs aT full free speed. This is probably caused by: worn or sticking clutch parts, due
to inadequate lubrication.
you should: FOR OIL LUBED WRENCHES - check for presence of clutch oil (where oil is specified for clutch) and remove oil fill
plug; tilt to drain all oil from clutch case; refill with 30 weight SAE oil or that recommended by manufacturer, in the speci-
fied amount. Also check for excess clutch oil. Clutch cases need only be filled 50%. Overfilling can cause drag on high speed
clutch parts. A typical 1/2" oil-lubed wrench only requires 1/2 ounce of clutch oil. FOR GREASE LUBED WRENCHES - Check for
excess grease by rotating drive shank by hand. It should turn freely. Excess is usually expelled automatically.
Tool Will noT shuT off. This is probably caused by: throttle valve O-ring broken or out of position or throttle valve stem bent
or jammed with dirt particles.
you should: Remove assembly and install new O-ring. Lubricate with air tool oil and operate trigger briskly. If operation cannot
be restored,tool should be serviced at authorized service center.
air raTcheTs
MOTOR RUNS. SPINDLE DOESN'T TURN, OR TURNS ERRATICALLY — This is probably caused by: worn teeth on ratchet or pawl;
weak or broken pawl pressure spring; weak drag springs fail to hold spindle while pawl advances for another bite.
you should: have replacement parts installed by authorized service center.
Tool doesn’T run, raTcheT head indexes crisply By hand— This is probably caused by: dirt or sludge build-up in motor
parts.
you should: Pour a generous amount of air tool oil into air inlet. Operate throttle in short bursts. With socket engaged on
bolt, alternately tighten and loosen bolt by hand. If tool remains jammed, it should be serviced at authorized service center.
NOTE
Disassembly of this tool by other than an authorized service center WILL VOID the warranty on this tool.
(Continued on page 8)
5
Drive ................................. 1"
Torque Range ...................150-1200 ft./lbs.
Max. Torque ....................1500 ft./lbs.
Overall Length .................19.5"
Net Wt. ............................18.5 LBS.
Avg. Air Cons. ..................9 CFM
Air Inlet ............................1/2"NPT
Min. Hose Size .................1/2" ID
Recom.. Air Pressure ........90 PSIG
Free Speed ........................4000 RPM
Sound Level ......................97 dBA

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TROUBLESHOOTING
air drills
TOOL WILL NOT RUN, RUNS SLOWLY, AIR FLOWS SLIGHTLY FROM EXHAUST, SPINDLE TURNS FREELY — This is probably caused by:
air flow blocked by dirt build-up; motor parts jammed with dirt.
you should: Check air inlet for blockage. Pour a generous amount of air tool oil into air inlet. Operate trigger in short bursts
Detach air supply; turn empty and closed drill chuck by hand. Reconnect air supply If tool performance is not improved, it
should be serviced at an authorized service center.
Tool Will noT run. air floWs freely froM exhausT. spindle Turns freely — This is probably caused by: Build up of dirt
or varnish on rotor vanes.
you should: Pour a generous amount of air tool oil into air inlet. Operate trigger in short bursts Detach air supply; turn empty
and closed drill chuck by hand. Reconnect air supply. If tool performance is not improved, it should be serviced at an autho-
rized service center.
Tool locked up, spindle Will noT Turn — This is probably caused by: a broken motor vane; gears broken or jammed by for-
eign object.
you should: Send the tool to an authorized service center.
Tool Will noT shuT off — This is probably caused by: throttle valve O-ring blown off seat.
you should: See breakdown for part number and replace O-ring or send the tool to an authorized service center.
air haMMers
TOOL WILL NOT RUN — This is probably caused by: cycling valve or throttle valve clogged with dirt or sludge.
you should: Pour a generous amount of air tool oil into air inlet; check for dirt. Operate trigger in short burst (chisel in place
and against solid surface). If not free, detach air supply. Tap nose or barrel lightly with plastic mallet, reconnect air supply,
and repeat above steps. If still not free, detach air supply, insert a 6" piece of 1/8" diameter rod in nozzle and lightly tap to
loosen piston in rear direction. Reconnect air supply and repeat above steps.
chisel sTuck in nozzle— This is probably caused by: the end of the shank being disformed.
you should: Send the tool to an authorized service center.
(Continued from page 5)
WARRANTY POLICY: NAPA PROFESSIONAL AIR TOOLS are warranted against defects in
material and workmanship for a period of one (1) year from the date of the original purchase.
We will repair or replace at our option any defective part or unit which proves to be defec-
tive in material or workmanship during this one year period. All NAPA PROFESSIONAL AIR
TOOLS must be repaired only by authorized NAPA PROFESSIONAL AIR TOOL Service Centers.
This warranty does not cover damage to tools rising from alteration, abuse, misuse and does
not cover any repairs made by anyone other than an authorized NAPA PROFESSIONAL AIR
TOOL Warranty Center. Tools sent to a Warranty Center in a dissembled condition will not be
covered as a warranty repair.
Return tools to Service Centers transportation prepaid. Be certain to include your name,
address and phone number along with proof of purchase information, with each tool.