Craftsman 921.1531 User Manual
Owner's Manual
AIR COMPRESSOR
3-gallon
1.5 HP (max developed)
1 HP Running
Oil Lubricated
Model No. 921.153100
CAUTION:
Before using this product,
read this manual and follow
all its Safety Rules and
Operating Instructions.
Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.
www.sears.com/craftsman
06/17#2004
Part NO. E100731
• Safety instructions
• Installation & Operation
• Maintenance & Storage
• Troubleshooting Guide
• Parts List
• Espa_ol, p. 10
TABLE OF CONTENTS
Page
Warranty ...................... ,................................................................................ see below
Safety Instructions ................................................................................................. 1
Important Safety Instructions & Guidelines ........................................................... 1
Specifications ......................................................................................................... 2
Glossary ................................................................................................................ 2
Duty Cycle ............................................................................................................. 2
Parts & Features ................................................................................................... 3
installation &Assembly ......................................................................................... 4
Operating Procedures ........................................................................................... 5
Maintenance .......................................................................................................... 6
Storage .................................................................................................................. 6
Troubleshooting Guide .......................................................................................... 7
Parts List................................................................................................................. 8
EspaSol.................................................................................................................... 10
Service Number.......................................................................................... back cover
ONE YEAR FULL WARRANTY ON CRAFTSMAN AIR COMPRESSOR
If thisCraftsman Air Compressor fails due to manufacturer's defects in material or workmanship
within one year of the date of purchase, RETURN IT TO THE NEAREST SEARS STORE OR
SERVICE CENTER IN THE UNITED STATES and it will be replaced or repaired (at our option),
free of charge.
If this Air Compressor is used for commercia?or rental purposes, this warrantyapplies for only 90
days from the date of purchase. This warranty gives you specific legal rights and you may also
have other rights which vary from state to state.
Sears, Roebuck and Co., Dept. 817WA,
Hoffman Estates, IL 60179
Safety Instructions
The information listed below should be read and
understood by the operator. This information is given to
_rotect the user while operating and storing the air
compressor. We utnize the symbols below to allow the
reader to recognize important information about their
safety.
Indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
When used without the safety alert symbol indicates a
potentially hazardous situation which, if not avoided, may
result in property damage.
Important Safety Instructions and Guidelines
• Save all instructions
Improper operation or maintenance of this product could result in serious injury and/or property damage. Read and
understand all of the warnings and safety instructions provided before using this equipment.
The air compressor should be operated on a dedicated 15 amp circuit. Ifthe circuit does
not have 15 free amps available, a larger circuit must be used. Always use more air
hose before utilizing extension cords. All extension cords used must be 12 gauge with
a maximum length of 25 ft. The circuit fuse type must be a time delay. Low voltage could
cause damage to the motor.
Risk of Moving Parts
If the air compressor is in operation, all guards and covers should be attached or
installed correctly. If any guard or cover has been damaged, do not operate the
equipment until the proper personnel has correctly repaired the equipment. The power
cord should be free of any moving parts, twisting and/or crimping while in use and while
in storage.
Risk of Burns
N
Risk of Falling
Risk from
Flying Objects
There are surfaces on your air compressor that while in operation and thereafter can
cause serious burns if touched. The equipment should be allowed time to cool before
any maintenance is attempted. Items such as the compressor pump and the outlet tube
are normally hot during and after operation.
Operation of the air compressor should always be in a position that is stable. Never use
the air compressor on a rooftop or elevated positionthat could allow the unit to fall or
be tipped over. Use additional air hose for elevated jobs.
Always wear ANSI Z87.1 approved safety glasses with side shields when the air
compressor is in use. Turn off the air compressor and drain the air tank before
performing any type of maintenance or disassembly of the hoses or fittings. Never point
any nozzle or sprayer toward any part of the body or at other people or animals.
Important Safety Instructions & Guidelines
Risk to Breathing
Risk of
Electrical Shock
Risk of
Explosion or Fire
Risk of Bursting
Avoid using the air compressor in confined areas. Always have adequate space
(12 inches) on all sides of the air compressor. Also keep children, pets, and others out
of the area of operation. This air compressor does not provide breathable air for anyone
or any auxiliary breathing device. Spraying material will always need to be in another
area away from the air compressor to not allow intakeair to damage the air compressor
filter.
Never utilize the air compressor in the rain or wet conditions. Any electrical issues or
repairs should be performed by authorized personnel such as an electrician and should
comply with all national and local electrical codes. The air compressor should also have
the proper three prong grounding plug, correct voltage, and adequate fuse protection.
Never operate the compressor near combustible materials, gasoline or solvent vapors.
If spraying flammable materials, locate the air compressor at least 20 feet away from
the spray area. Never operate the air compressor indoors or in a confined area.
Always drain the air compressor tank daily or after each use. if the tank develops a leak,
then replace the air compressor. Never use the air compressor after a leak has been
found or try to make any modifications to the tank. Never modify the air compressor's
factory settings which control the tank pressureor any other function.
Specifications
Pump ...................... Oil-lube direct drive
Motor Induction ............... 1.5 HP max developed,
1HP running
Bore ....................... 1.65"
Stroke ...................... 1.26"
Voltage Single Phase ........... 120 VAC
Minimum Circuit Requirement .... 15 Amps
Air Tank Capacity ............. 3 Gallons
Cut-in Pressure ............... 95 PSI
Cut-out Pressure .............. 125 PSI
SCFM @ 90 PSI .............. 2.4
Glossary
CFM: Cubic feet per minute.
SCFM: Standard cubic feet per minute; a unit of measure
for air delivery.
PSIG: Pounds per square inch gauge; a unit of measure
for pressure.
ASME: American Society of MechanicalEngineers.
California Code: Unit may complywith California Code
462 (I) (2)/(M) (2).
Cut-In Pressure: The air compressorwill automatically
startto refillthe tank when the pressure drops
below the prescribed minimum.
Cut-Out Pressure: The point at which the motor stops
when the tank has reached maximum air
pressure.
Code Certification: Products that bear one or more of
the following marks: UL, CUL, ETL, CSA, have
been evaluated by OSHA-certified independent
safety laboratories and meet the applicable
Underwriters Laboratories Standards for Safety.
Duty Cycle
This is a 50% duty cycle air compressor. Do not run the air compressor more than 30 minutes of one hour. Doing so
could damage the air compressor.
2
Parts & Features
See figures below for reference.
Air Intake Filter
Provides clean air to the pump and must always be kept free of debris. Check on a daily basis or before each use.
Indicates the outgoing air pressure to the tool and is controlled
I Regulator Gauge
by the regulator.
Tank Pressure Gauge
Indicates the reserve air pressure inthe tank.
Outlet Tube
Oil Fill Cap
Pressure Switch
Thiscontrolsthe powerto the motorand also the
cut-in/cut-outpressuresettings. This switchserves
as theAuto-On/Off positionsfor the unit,
J
Pressure Relief Valve
The pressure relief valve located on the
side of the pressure switch, isdesigned to
automaticallyrelease compressedair when
the air compressor reaches cut-out pressure.
The released air should onlyescape
momentarilyand the valve shouldthen close.
Used to allow excess tank pressure to
escape into the atmosphere.This valve
Safety Valve 1
should only open when the tank pressure
isabove the maximum ratedpressure.
Re_,.gulator
Ine air pressure coming from the air tank is
controlled by the regulator. To increase the
pressure turn the knob clockwise and to
Pressure
Relief Tube
Quick Connect 1Offers a quick release feature for attaching and removing the air hose.
Tank Drain Valve /
Oil Sight Gauge
I Check Valve 1When the pump is not in operation the valve closes to retain air pressure inside the tank. An internal component.
Used to drain condensation from the air tank, Locatedat bottom of tank.
decrease the pressure turn the knob
counterclockwise.
Installation & Assembly
The air compressor should be turned off and unplugged from
the power source before any maintenance is performed as
well as the air bled from the tank and the unit allowed time
to cool. Personal injuries could occur from moving parts,
electrical sources, compressed air or hot surfaces. The
regulator assembly must be attached before use. Failure to
assemble correctly could result in leaks and possible injury.
If unsure of assembly instructions or you experience difficulty
in the assembly please call your local service department for
further instruction.
Quick Connect Assembly
1. Before assembly be sure that the
Quick Connect (Q.C.) threads have a
sealant applied from the factory to prevent
leaks around the threads. If no sealant is
present, wrap the threaded portion with
Teflon tape.
2. Attach the Q.C. assembly to the air compressor by
aligning the Q.C. threads to the regulator on the manifold.
Be certain to align the threads before tightening to prevent
thread damage.
3. The assembly should turn clockwise 1 to 1.5 revolutions
after hand-tightening with a 13/16ths size wrench. To prevent
damage and leaks, do not
over-tighten.
To Install the Air Intake Filter
Remove the air intake filter from the
poly bag and thread it onto the head
of the compressor as shown.
Do not attempt to start the air compressor without first adding
oil to the crankcase. Serious damage can result unless filled
with oil. The pump is shipped without oil from the factory.
Only use non-detergent oils since multi-viscosity motor oils
leave carbon deposits on pump components, thus reducing
performance and compressor life.
Drain the tank to release all tank air _ _.=t_{ '_L
pressure before removing the oil fill cap.
Be sure the air vent in the oil fill cap (see
figure to the right) is free from debris.
If air vent is blocked, pressure can build
in crankcase causing damage to the
compressor and possible personal injury.
Lubrication and Oil
Remove the oil fill cap by turning it _ /_-,,,
counter-clockwise by hand. Fill the
compressor pump with an air compressor
oil such as SAE-30 non-detergent (API
CG/CD Heavy Duty) oil at slow intervals
until the oil reaches the center of the red
circle in the sight glass ( see figure above).
Use SAE-10 during extreme winter conditions.
Location of the Air Compressor
The air compressor should always be located in a clean,
dry, and well ventilated environment. The unit should have
at minimum, 12 inches of space on each side. The air filter
intake should be free of any debris or obstructions. Check
the air filter on a daily basis to be sure it is clean and in
working order.
Grounding instructions
This product should be grounded. In the event of an electrical
short circuit, grounding reduces the risk of electric shock by
providingan escape wire for the electric current. This product
is equipped with a cord having a grounding wire with an
appropriate grounding plug. (See the figure below.) The plug
must be plugged intoan outlet that isproperly installed and
grounded in accordance with all local codes and ordinances.
Check with a qualified
electrician or service
personnel if these
instructions are not
completely understood
or if in doubt as to
whether the tool is
properly grounded.
improper installation of the grounding plug will result in a
risk of electric shock. If repair or replacement of the cord
or plug is necessary, do not connect the grounding wire to
either flat blade terminal. The wire with insulation having an
outer surface that is green with or without yellow stripes is
the grounding wire. Check with a qualified electrician or
serviceman if the grounding instructions are not completely
understood, or if in doubt as to whether the product is
properly grounded. Do not modify the plug provided; if it
will not fit the outlet, have the proper outlet installed by a
qualified electrician.
This product is for use on a circuit having a nominal rating
of 120 volts and is factory-equipped with a specific electric
cord and plug to permit connection to a proper electric circuit.
Make sure that the product is connected to an outlet having
the same configuration as the plug. No adapter should be
used with this product. If the product must be reconnected
for use on a different type of electric circuit, qualified service
personnel should make the reconnection.
Extension Cords
Use only a 3-wire extension cord that has a 3-blade
grounding plug, and a 3-slot receptacle that will accept the
plug on the product. Make sure your extension cord is in
good condition. When using an extension cord, be sure to
use one heavy enough to carry the current your product will
draw. Cords must not exceed 25 feet and No. 12 AWG size
must be used. An undersized cord will cause a drop in line
voltage resulting in loss of power and overheating.
Break In Procedures
No break in procedure is required by the user. This
product is factory tested to ensure proper operation and
performance.
Grounding Pin
Outlet
Grounded
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