Craftsman Air Compressor 921153120 User Manual

Owner’s Manual  
®
AIR COMPRESSOR  
2-gallon  
1HP  
Oil Lubricated  
Model No. 921.153120  
CAUTION:  
• Safety Instructions  
• Installation & Operation  
• Maintenance & Storage  
• Troubleshooting Guide  
• Parts List  
Before using this product,  
read this manual and follow  
all its Safety Rules and  
Operating Instructions.  
• Español, p. 10  
Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.  
08/11/2006  
Part No. E102346  
 
Safety Symbols  
The information listed below should be read and understood by the operator. This information is given to protect the  
user while operating and storing the air compressor. We utilize the symbols below to allow the reader to recognize important  
information about their safety.  
DANGER  
Indicates an imminently hazardous situation which, if not  
avoided, will result in death or serious injury.  
CAUTION  
Indicates a potentially hazardous situation which, if not  
avoided, may result in minor or moderate injury.  
CAUTION  
When used without the safety alert symbol indicates a  
potentially hazardous situation which, if not avoided, may  
result in property damage.  
WARNING  
Indicates a potentially hazardous situation which, if not  
avoided, could result in death or serious injury  
Important Safety Instructions and Guidelines  
• Save all instructions  
WARNING: This product contains one or more chemicals known to the State of  
California to cause cancer and birth defects or other reproductive harm.  
Wash hands after handling.  
WARNING  
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. If the 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.  
CAUTION  
If the air compressor is in operation, all guards and covers should be attached or  
Risk of Moving Parts  
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.  
There are surfaces on your air compressor that while in operation and thereafter can  
Risk of Burns  
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 position that could allow the unit to fall or  
be tipped over. Use additional air hose for elevated jobs.  
Risk of Falling  
Always wear ANSI Z87.1 approved safety glasses with side shields when the air  
Risk from Flying Objects  
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.  
1
 
Important Safety Instructions & Guidelines  
Avoid using the air compressor in confined areas. Always have adequate space  
Risk of Breathing  
(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 intake air 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.  
Risk of  
Electrical Shock  
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.  
Risk of  
Explosion or Fire  
Risk of Bursting  
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 pressure or any other function.  
Specifications  
Air Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . 2 Gallons  
Cut-in Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95 PSI  
Cut-out Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . .125 PSI  
SCFM @ 90 PSI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.4  
Oil Capacity . . . . . . . . . . . . . . . . . . . . . . . . . 90 mL or 3 oz.  
Oil Type . . . . . . . . . . . . . . . . . . . . . . . .SAE 30 Non-detergent  
Pump . . . . . . . . . . . . . . . . . . . . . . . . . . Oil-lube direct drive  
Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.0 HP (Induction)  
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.65”  
Stroke. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.26”  
Voltage Single Phase. . . . . . . . . . . . . . . . . . . . . . . 120 VAC  
Minimum Circuit Requirement . . . . . . . . . . . . . . . . 15 Amps  
Glossary  
CFM: Cubic feet per minute.  
Cut-Out Pressure: The point at which the motor stops  
when the tank has reached maximum air  
pressure.  
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.  
Code Certification: Products that bear one or more of  
the following marks: UL, ULc, ETL, CSA, have  
been evaluated by OSHA-certified independent  
safety laboratories and meet the applicable  
ASME: American Society of Mechanical Engineers.  
California Code: Unit may comply with California Code  
462 (l) (2)/ (M) (2).  
Underwriters Laboratories Standards for Safety.  
Cut-In Pressure: The air compressor will automatically  
start to refill the tank when the pressure drops  
below the prescribed minimum.  
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.  
Check Valve  
Tank Pressure Gauge  
Indicates the reserve air pressure  
in the tank.  
When the pump is not in operation the valve closes  
to retain air pressure inside the tank. An internal  
component.  
Outlet Tube  
Quick Connect  
Offers a quick release feature for attaching and  
removing the air hose.  
Regulator Gauge  
Indicates the outgoing air pressure to the tool and is  
controlled by the regulator.  
Regulator  
The air pressure coming from the air tank is controlled  
by the regulator. To increase the pressure turn the  
knob clockwise and to decrease the pressure turn the  
knob counterclockwise.  
Pressure Switch  
This controls the power to the motor and also the  
cut-in/cut-out pressure settings. This switch serves  
as the Auto-On/Off positions for the unit.  
Tank Safety Valve  
Used to allow excess tank pressure to escape into  
the atmosphere. This valve should only open when  
the tank pressure is above the maximum rated  
pressure.  
Pressure Relief Valve  
The pressure relief valve located on the side  
of the pressure switch, is designed to  
automatically release compressed air when the  
air compressor reaches cut-out pressure. The  
released air should only escape momentarily  
and the valve should then close.  
Pressure Relief Tube  
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.  
Oil Fill Cap  
Oil Sight Gauge  
Tank Drain Valve  
Used to drain condensation from the air tank.  
Located at bottom of tank.  
3
 
Installation & Assembly  
electrician or service personnel if these instructions are not  
completely understood or if in doubt as to whether the tool  
is properly grounded.  
WARNING  
The air compressor should be turned off, unplugged from  
the power source, the air bled from the tank and the unit  
allowed time to cool before any maintenance is performed.  
Personal injuries could occur from moving parts, electrical  
sources, compressed air or hot surfaces. The quick  
connect 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.  
Plug  
Grounded  
Outlet  
Grounding Pin  
Assembly  
WARNING  
1. Remove air compressor, oil bottle, intake filter, manual  
and accessories from the styrofoam.  
2. Remove the plastic plug from the compressor intake  
port. (see diagram below)  
3. Install the filter in the compressor intake port.  
(see diagram below)  
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.  
4. Remove the oil fill cap from the crankcase and fill until  
the oil reaches the top of the red dot in the sight glass.  
Oil capacity is 3 oz. (see below) Use SAE-30 non-deter  
gent (API CG/CD heavy duty motor oil). Under extreme  
cold weather conditions, 32° F (0°C) or below, use  
SAE-10 weight oil.  
5. Replace the oil cap.  
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 the product is connected to an outlet  
having the same configuration as the plug. An adapter  
should not 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.  
6. Attach the handle to the frame with the saddle bolts  
from the outside of the handle and the knobs on the  
inside.  
A
S
A
T
F
B
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E
3
T
F
0
L
N
E
W
O
o
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N
IT  
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-D  
H
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te  
T
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e
O
IL  
n
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1
0
1
3
1
1
2
3
4
Estimated Assembly Time: Approximately 5 minutes  
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.  
Getting Started - 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 make sure it is clean  
and in working order.  
Grounding Instructions  
Break In Procedures  
This product should be grounded. In the event of an electrical  
short circuit, grounding reduces the risk of electric shock by  
providing an 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 at  
top right corner.) The plug must be plugged into an outlet  
that is properly installed and grounded in accordance with  
all local codes and ordinances. Check with a qualified  
No break in procedure is required by the user.  
This product is factory tested to ensure proper operation and  
performance.  
4
 
Operating Procedures  
Daily Start-Up Procedures  
6. Plug the power cord into the proper receptacle.  
7. Turn the Auto-On/Off lever to the On-Auto position and  
the compressor will start and build air pressure in the  
tank to cut-out pressure and then shut off automatically.  
8. Adjust the regulator to a PSI setting that is needed for  
your application and be sure it is within the safety  
standards required to perform the task. If using a  
pneumatic tool, the manufacturer should have  
recommendations in the manual for that particular  
tool on operating PSI settings.  
9. The air compressor is now ready for use. The following  
inflation and cleaning accessories packaged with this  
unit should only be operated at maximum pressure  
of 90PSI: blow gun, rubber-tapered nozzle, inflation  
needles, adapter, and blow gun adapter.  
1. Set the Auto-On/Off lever to the Off position.  
2. Inspect the air compressor, air hose, and any  
accessories/tools being used for damage or obstruction.  
If any of these mentioned items are in need of repair/  
replacement, contact your local authorized service dealer  
before use.  
3. Close the drain valve.  
4. Check the oil level of the pump.  
5. Connect the air hose to the quick connect socket on  
the regulator assembly by inserting the quick connect  
plug on the air hose into the quick connect socket. The  
quick connect socket collar will snap forward and lock  
the plug into place providing an air tight seal between  
the socket and plug. To release the air hose push the  
collar back on the quick connect socket.  
6
5
8
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7
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1
3
4
Daily Shut-Down Procedures  
CAUTION  
1. Set the Auto-On/Off lever to the Off position.  
2. Unplug the power cord from the receptacle.  
3. Set the outlet pressure to zero on the regulator.  
4. Remove any air tools or accessories. When draining  
the tank, always use ear and eye protection. Drain the  
tank in a suitable location; condensation will be present  
in most cases of draining.  
5. Open the drain valve allowing air to bleed from the  
tank. After all of the air has bled from the tank, close  
the drain valve to prevent debris buildup in the valve.  
When draining the tank, always use ear and eye protection.  
Drain the tank in a suitable location; condensation will be  
present in most cases of draining.  
WARNING  
Water that remains in the tank during storage will corrode  
and weaken the air tank which could cause the tank to  
rupture. To avoid serious injury, be sure to drain the tank  
after each use or daily.  
5
 
Maintenance  
NOTE: Any service procedure not covered in the  
maintenance schedule should be performed by  
qualified service personnel.  
Before each use  
or daily  
Items to Check/Change  
Check Tank Safety Valve  
Overall Unit Visual Check  
Check Air Filter  
X
X
X
X
WARNING  
The air compressor should be turned off, unplugged  
from the power source, air bled from the tank and  
allowed time to cool before any maintenance is  
performed.  
Drain Tank  
Check Power Cord for Damage  
X
after first 50 hours  
after every 100 hours  
X
CAUTION  
Change Oil  
To ensure efficient operation and longer life of the  
air compressor unit, a routine maintenance schedule  
should be followed. The following schedule is geared  
toward a consumer whose compressor is used in a  
normal working environment on a daily basis.  
Check Oil Level  
Storage  
For storing the air compressor, be sure to do the following:  
1. Turn the unit off and unplug the power cord from the  
receptacle.  
2. Remove all air hoses, accessories, and air tools from  
the air compressor.  
3. Perform the daily maintenance schedule.  
4. Open the drain valve to bleed all air from the tank.  
5. Close the drain valve.  
6. Store the air compressor in a clean and dry location.  
6
 
Troubleshooting Guide  
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.  
WARNING  
PROBLEM  
POSSIBLE CORRECTION  
Air leaks at the check valve  
A defective check valve results in a constant air leak at the pressure relief valve  
or at the pressure relief valve. when there is pressure in the tank and the compressor is shut off. Drain the tank,  
then remove and clean or replace the check valve.  
Air leaks between head and  
cylinder.  
Be sure of proper torque on head bolts. If leak remains, contact a service technician.  
Air leak from safety valve.  
Operate the safety valve manually by pulling on the ring. If the valve continues to  
leak when in the closed position, it should be replaced.  
Pressure reading on the  
regulated pressure gauge  
drops when an accessory is  
used.  
If there is an excessive amount of pressure drop when the accessory is used,  
replace the regulator.  
NOTE:  
Adjust the regulated pressure under flow conditions (while accessory is being used).  
It is normal for the gauge to show minimal pressure loss during initial use of the  
tool.  
Excessive tank pressure.  
Motor will not start.  
Move the Auto-On/Off lever to the Off position. If the unit doesn’t shut off, unplug it  
from the power source and contact a service technician.  
Make sure power cord is plugged in and the switch is on. Inspect for the proper size  
fuse in your circuit box. If the fuse was tripped, reset it and restart the unit. If  
repeated tripping occurs, replace the check valve or contact a service technician.  
Excessive moisture in the  
discharge air.  
Remove the water in the tank by draining after each use. High humidity  
environments will cause excessive condensation. Utilize water filters on your air  
line.  
NOTE:  
Water condensation is not caused by compressor malfunction. Be sure the  
compressor’s air output is greater than your tool’s air consumption rate.  
Air leaks from the tank body  
or tank welds.  
Never drill into, weld or otherwise modify the air tank or it will weaken. The tank can  
rupture or explode. Compressor cannot be repaired. Discontinue use of the air  
compressor.  
7
 
Air Compressor Model 15312  
Parts List  
8
 

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