Page 1
3/8-in. Ratchet Wrench
Owner's Manual
Model No. 875.199340
Unpacking
When unpacking this product, carefully
inspect for any damage that may have
occurred during transit. Make sure any
loose fittings, bolts, etc. are tightened
before putting this product into service.
WARNING: Please read and save these safety and operating instructions. Read carefully
before attempting to assemble, install, operate or maintain the product described.
Protect yourself and others by observing all safety information. Failure to comply with
instructions could result in personal injury and/or property damage! Retain instructions
for future reference.
Sears, Roebuck and Co., Hoffman Estates, IL 60179 o807
www.CRAFTSMAN.com
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Owner's Manual Model No. 875. f99340 Owner's Manual Model No. 875. f99340
90 PSI Maximum
This tool is designed to operate at an air
_, Features & Benefits
_, Specifications
_, Product Warranty
_, Compressor Requirements
Important Safety Instructions
_, Installation and Operation
_, Maintenance
_, Exploded View Drawing & Parts List
_, Troubleshooting
The Craftsman Model 875.199340 3/8-in.
Drive ratchet wrench is designed for
applications such as automotive repair,
general assembly, transmission
teardown and maintenance. Features a
unique variable speed throttle that allows
precise control of the speed and power of
the tool. Insulated "soft touch" grip for
maximum comfort. Extra heavy duty
ratchet head designed for the true
professional.
Drive size ........................................... 3/8"
Free speed (No Load) ............. 180 RPM
Max Torque ................................ 70 ft. Ibs.
Weight .......................................... 2.6 Ibs.
Overall length ............................... 10-1/8"
Average air consumption ........... 4.5 CFM
Recommended hose size .......... 3/8" I.D.
Air inlet ....................................... 1/4" NPT
Maximum Air Pressure .................. 90 PSI
ONE YEAR FULL WARRANTY ON
CRAFTSMAN PROFESSIONAL TOOL
If this Craftsman tool fails to give complete
satisfaction within one year from the date
of purchase, RETURN IT TO ANY SEARS
STORE OR PARTS & REPAIR CENTER
OR OTHER CRAFTSMAN OUTLET IN
THE UNITED STATES FOR FREE
REPAIR (or replacement if repair proves
impossible).
This warranty does not include
expendable parts, such as lamps,
batteries, bits or blades.
This warranty gives you specific legal
rights, and you may also have other rights
which vary from state to state.
Sears, Roebuck and Co.,
Hoffman Estates, IL 60179
Light Use - 17 Gallon
Typical Use - 26 Gallon
Heavy Use - 33 Gallon Professional
Read Operating Instructions
Please become familiar with all the
instructions and warnings before
operating any pneumatic tool.
Always Wear Approved Eye Protection
Impact resistant eye protection should
meet or exceed the standards set forth in
ANSI Z87.1, Occupational and
Educational Eye and Face Protection.
Look for marking Z87.1 on your eye
protection to ensure that it is an approved
style.
Hearing Protection is Recommended
Hearing protection should be used when
the noise level exposure equals or
exceeds an 8 hour time-weighted average
sound level of 85dBA. Process noise,
reflective surfaces, other tools being
operated nearby, all add to the noise level
in a given work area. If you are unable to
determine your noise level exposure, we
recommend the use of hearing protection.
Avoid Prolonged Exposure to Vibration
Pneumatic tools can vibrate during use.
Prolonged exposure to vibration or very
repetitive hand and arm movements can
cause injury. Discontinue the use of any
tool if you experience tingling, numbness,
discomfort or pain in your hands or arms.
You should consult your physician before
resuming use of tool.
pressure of 90 pounds per square inch
gauge pressure (90 PSI) maximum, at the
tool. Use of higher air pressure can, and
may cause injury. Also, the use of higher
air pressure places the internal
components under loads and stresses
they were not designed for, causing
premature tool failure.
California Prop 65
Some dust created by power sanding,
sawing, grinding, drifting 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 paint, crystalline
silica from bricks and cement and other
masonry products, arsenic and
chromium from chemicafty-treated
lumber.
Your risk from those 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 dust masks
that are specifically designed to filter
out microscopic particles.
ENG-2 ENG-3
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Owner's Manual Model No. 875. f99340 Owner's Manual Model No. 875. f99340
Disconnect the air tool from air supply
before changing tools or attachments,
servicing and during non-operation.
Do not wear loose fitting clothing,
scarves, or neck ties in work area. Loose
clothing may become caught in moving
parts and result in serious personal injury.
Do not wear jewelry when operating
any tool. Jewelry may become caught in
moving parts and result in serious
personal injury.
Do not depress trigger when connecting
the air supply hose.
Never trigger the tool when not applied
to a work object.
Attachments must be securely
attached. Loose attachments can cause
serious injury.
Protect air lines from damage or
puncture.
Never point an air tool at oneself or any
other person. Serious injury could occur.
Check air hoses for weak or worn
conditions before each use. Make sure all
connections are secure.
Use attachments designed for use with
air powered tool. Always examine
accessories before mounting for chips,
cracks, or signs of damage.
Never use mounted points or other
accessories that have been dropped or
exposed to water, solvent or extreme
temperature changes, it is a good practice
to operate the tool in a protected
enclosure for one minute after mounting
any accessory.
Always use accessories with an RPM
rating that meets or exceeds the tool
RPM rating.
Never carry a tool by the hose or pull
the hose to move the tool or a
compressor. Keep hoses away from
heat, oil and sharp edges. Replace any
hose that is damaged, weak or worn.
Some materials such as adhesives and
tar, contain chemicals whose vapors
could cause serious injury with
prolonged exposure. Always work in a
clean, dry, well ventilated area.
Tools which contain moving elements,
or drive other moving tools, such as
grinding wheels, sockets, sanding
discs, etc., can become entangled in
hair, clothing, jewelry and other loose
objects, resulting in severe injury.
Never wear loose fitting apparel which
contains loose straps or ties, that could
become tangled in moving parts of the
tool. Remove any jewelry, watches, etc.,
which might become caught by the
tool. Keep hands away from moving
parts. Tie up or cover long hair.
Tools which cut, shear, drill, staple,
punch, chisel, etc. are capable of
causing serious injury. Keep the
working part of the tool away from
hands and body.
After an air tool has been lubricated, oil
will discharge through the exhaust port
during the first few seconds of
operation. Thus, the exhaust port must
be covered with a towel before applying
air pressure.
Always make sure that tool accessories
meet or exceed the tools reccomended
output.
Improperly maintained tools and
accessories can cause serious injury.
Release all pressure from the system
before attempting to install, service,
relocate or perform any maintenance.
Keep all nuts, bolts and screws tight
and ensure equipment is in safe working
condition.
ENG-4 ENG-5
Inhalation hazard: Abrasive tools, such
as grinders, sanders and cut-off tools
generate dust and abrasive materials
which can be harmful to human lungs
and respiratory system. Always wear
MSHA/NIOSH approved, properly fitting
face mask or respirator when using
such tools.
Maintain the tool with care. A properly
maintained tool, with sharp cutting
edges, reduces the risk of binding and
is easier to control.
There is a risk of bursting if the tool is
damaged. Check for misallgnment or
binding of moving parts, breakage of
parts and any other condition that
affects the tool's operation. If damaged,
have the tool serviced before using.
Disconnect tool from air supply before
servicing or changing sockets.
When tightening, do not torque down
the nuts or bolts with the ratchet as
typically done with a hand wrench. This
can damage the tool by breaking parts
in the ratchet mechanism.
Page 4
Owner's Manual Model No. 875.199340 Owner's Manual Model No. 875.199340
be a flexible hose in order to isolate
Air Tool Hook Up
Before the tool is connected to the air
supply, clear the air hose of accumulated
dust and moisture by running air freely
through the air hose for 5-10 seconds.
Air Hoses for your Air Tools
Figure 1 Illustrates a recommended air
hose hook up.
A 3/8 inch ID air hose is required up to a
length of 25 feet. A 3/8 inch ID hose
longer than 25 feet will cause a pressure
drop and may impede performance. If
more length is required, a ½ inch ID air
hose is recommended. Be sure all hoses
and fittings are the correct size and
correctly secured before using the tool.
ENG-6
Never carry a tool by the hose or pull the
hose to move the tool or a compressor.
Keep hoses away from heat, oil and sharp
edges. Replace any hose that is damaged,
weak or worn.
Small (home) shop hard piping:
A piping diagram for a typical home shop
is shown. Some helpful tips are:
Always use hoses and pipes rated for
higher pressure than your system will
encounter.
Never use PVC pipes for
compressed air piping systems as
explosion and serious injury may
result.
The connection from the compressor
to the initial take-off hard pipe must
movement of the compressor.
Route the initial take-off line (pipe) as
straight up the shop wall and as high
as possible. This will help minimize
water leaving the compressor and
traveling through system.
Slope the main lines down at least
3/4 inch per 10 feet of pipe away
from air compressor; this will draw
the condensate with the flow of air
and away from the compressor.
Place the first drop as far from the
compressor as the size of your shop
will allow (50 feet is optimal, although
unrealistic for a small shop). The
further the drop, the more that
condensation can occur, and the
drier the air will be when it reaches
the water separator.
In order to reduce the amount of
water and contaminants that get into
the water separator, install the take-
off line on the top of the main air
supply line for each air drop.
A Drain line should be placed at the
end of the main line for condensate
drainage.
Drain valves should be placed at the
end of branch lines and the drain
line, and drained daily.
The Craftsman 3/8" Drive Ratchet Wrench
is designed to operate on 90 PSIG. Lower
pressure (below 90 PSI) will reduce
performance of the tool while higher air
pressure (over 90 PSI) raises the
performance of the tool beyond its rated
capacity and could cause serious
damage to tool and user.
Speed Adjustment
The ratchet should never be used to
set the torque. Use a torque wrench to
set the torque.
When tightening, do not torque down
the nuts or bolts with the ratchet as
typically done with a hand wrench. This
can damage the tool by breaking parts
in the ratchet mechanism.
ENG-7
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Owner's Manual Model No. 875. f99340 Owner's Manual Model No. 875. f99340
Exploded View Drawing
Lubrication
An in-line filter-regulator-lubricator (fig 1)
is recommended as it increases tool life
and keeps the tool in sustained operation.
The in-line lubricator should be regularly
checked and filled with air tool oil. Proper
adjustment of the in-line lubricator is
performed by placing a sheet of paper
next to the tools exhaust ports and holding
the throttle open approximately 30
seconds. The lubricator is properly set
when a light stain of oil collects on the
paper.
Excessive amounts of oil should be
avoided. In the event that it becomes
necessary to store the tool for an
extended period of time (overnight,
weekend, etc.), it should receive a
generous amount of lubrication through
the air inlet (Figure 3). The tool should be
run for approximately 30 seconds to
ensure oil has been evenly distributed
throughout the tool. The tool should be
stored in a clean and dry environment.
Recommended Lubricants
Use air tool oil or any other high grade
turbine oil containing moisture absorbent,
rust inhibitors, metal wetting agents and
an EP (extreme pressure) additive. See
Figure 3 for location/air inlet.
23
Parts List
ENG-8
Lubricate air motor here.......,._
Figure 3
ENG-9
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Owner's Manual Model No. 875. f99340
Owner's Manual Model No. 875.199340
Tool runs
slow or will
not operate.
Moisture
blowing out
of tool
1. Grit or gum in tool
2. No oil in tool
3. Low air pressure
4. Air hose leaks
5. Pressure drops
1. Water in tank
1. Flush the tool with air tool oil, gum
solvent, or an equal mixture of SAE 10
motor oil and kerosene. Lubricate the tool
after cleaning.
2. Lubricate the tool according to the
lubrication instructions in this manual.
3a. Adjust the regulator on the tool to the
maximum setting (If applicable).
3b. Adjust the compressor regulator to tool
maximum while the tool is running free.
4. Tighten and seal hose fittings if leaks are
found.
5a. Be sure the hose is the proper size.
Long hoses or tools using
large volumes of air may require a hose with
an I.D. of 1/2" or larger depending on the
total length of the hose.
5b. Do not use multiple number of hoses
connected together with quick connect
fittings. This causes additional pressure
drops and reduces the tool power. Directly
connect the hoses together.
1. Drain tank. (See air compressor manual).
Oil tool and run until no water is evident. Oil
tool again and run 1-2 seconds.
Ratchet mechanism Ratchet mechanism la. Clean mechanism with air tool oil
slips or will not loosen is dirty lb. Replace worn mechanism
Notes:
2. Water in the air lines/
hoses
ENG-10 ENG-11
2a. Install a water separator/filter.
NOTE: Separators only work properly when
the air passing through the separator is
cool. Locate the separator/filter as far as
possible from the compressor.
2b. Install an air dryer.
2c. Anytime water enters the tool, the tool
should be oiled immediately.
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