Craftsman 921.166400 User Manual [en, es]

Owner’s Manual

AIR COMPRESSOR
12-gallon
1 HP
Oil Lubricated

Model No. 921.166400

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

5/20/2005
Part No. E101338

• Safety Instructions

• Installation & Operation

• Maintenance & Storage

• Troubleshooting Guide

• Parts List

• Español, p. 10

TABLE OF CONTENTS

Page

Warranty..........................................................................................................................See Below

Safety Symbols....................................................................................................................... 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

Exploded View........................................................................................................................ 8

Parts List ............................................................... 9

Español ................................................................................................................................ 10

ONE YEAR FULL WARRANTY ON CRAFTSMAN AiR COMPRESSOR

If this Craftsman Air Compressor fails due to a defect in material or workmanship within one

year from the date of purchase, RETURN IT TO ANY SEARS STORE OR PARTS AND REPAIR

center or other CRAFTSMAN OUTLET IN THE UNITED STATES FOR FREE REPAIR.

If this Craftsman Air Compressor is used for commercial or rental purposes, this warranty
applies 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. 81 TWA,

Hoffman Estates, IL 60179

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.

A DANGER

Indicates an imminently hazardous situation which, if
not avoided, will result in death or serious injury.

A WARNING

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.

A CAUTION

CAUTION

Important Safety Instructions and Guidelines

• Save all instryctions

A 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

CAUTION

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

Risk of Bums

Risk of Falling

Risk from Fiying Objects

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.

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 position that 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

Risi c of Breatiling

Risk of

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Risk of

Exp

losion or Fire

Ris k of Burst

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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 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.

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 pressure or any other function.

Specifications

Pump

....................................................

Motor

......................................................

Bore..............................................................................1.65"

Stroke

...........................................................................

Voltage Single Phase

Minimum Circuit Requirement................................15 Amps

.............................................

Oil-lube direct drive

1.0 HP (Induction)

1.26”

120 VAC

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 Mechanical Engineers.
California Code: Unit may comply with California Code

462 (I) (2)/ (M) (2).
Cut-In Pressure: The air compressor will automatically

start to refill the tank when the pressure drops

below the prescribed minimum.

Duty Cycle

Air Tank Capacity

Cut-in Pressure.........................................................95 PSI

Cut-out Pressure.......................................................125 PSI

SCFM @ 90 PSI...............................................................2.4

Oil Capacity
Oil Type

Cut-Out Pressure: The point at which the motor stops

Code Certification: Products that bear one or more of

................................................

when the tank has reached maximum air
pressure.

the following marks: UL, ULc, ETL, CSA, have
been evaluated by OSHA-certified independent
safety laboratories and meet the applicable
Underwriters Laboratories Standards for Safety.

...............................................

..................................................

SAE 30 Non-detergent

12 Gallons

90 ml or 3 oz.

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.

Parts & Features

See figures below for reference.

r

Tank Pressure Gauge

Indicates the reserve air pressure in the tank

Regulator Gauge

Indicates the outgoing air pressure to the

tool and is controlled by the regulator.

V

Quick Connect

Offers a quick release feature for
attaching and removing the air hose.

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.

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.

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.

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.

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

Check Valve

When the pump is not in operation, the valve closes to retain
air pressure inside the tank. An internal component.

Installation & Assembly

A 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 our toll free number
for assistance.

Assembly

1. Remove air compressor, manual, air filter assembly,
and accessories from packaging.

2. Remove the plastic plug from the compressor intake
port, (see diagram beiow)

3. Install the filter in the compressor intake port.

(see diagram below)

Remove the oil fill cap from the crankcase and fill until

4.

the oil reaches the top of the red dot in the sight glass.
Oil capacity is 3 oz. (see below) Use SAE-30
non-detergent (API CG/CD heavy duty motor oil).

Under extreme cold weather conditions use SAE-10

weight oil.

Replace the oil cap.

'' f V

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 electrician or
service personnel if these instructions are not completely

understood or if in doubt as to whether the tool is properly
grounded.

A WARNING

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 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.

Estimated Assembly Time: Approximate y 5 minutes

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

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 below.)

Grounded

Outlet

Grounding Pin

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.