Craftsman 921165720 Owner’s Manual

Owner's Manual

icR. M..i

AiR COMPRESSOR
33-gallon

1.7 HP

Oil-Free, UMC
Model No. 921.165720

CAUTION:

Before using this product, read this
manual and follow all its Safety

Rules and Operating instructions.

Sears Brand Management Corporation, Hoffman Estates, IL 60179
U.S.A.

www.sears.com/craftsman

04/12/2013
Part No. E106178

• Safety instructions

• Installation & Operation

• Maintenance & Storage

• Troubleshooting Guide

• Parts List

• EspaSol, p. 24

Page

Warranty .......................................... see below

Safety Symbols ............................................ 3

Important Safety Instructions & Guidelines ....................... 3

Specifications ............................................. 9

Glossary ................................................. 9

Duty Cycle ............................................... 10

Overview ................................................ 11

Assembly ................................................ 12

Installation ............................................ 13-14

Operating Procedures ...................................... 15

Maintenance ............................................. 16

Storage ................................................. 16

Troubleshooting Guide .................................. 17-18

Parts List ............................................. 19-21

Spanish ................................................. 24

Service Number .................................... back cover

ONE YEAR FULL WARRANTY ON CRAFTSMAN

AIR COMPRESSOR

If this Craftsman 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 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 Brand Management Corporation, Hoffman Estates, IL 60179

U.S.A.

2- ENG

This manual contains information that is important for you to know and understand.
This information relates to protecting YOUR SAFETY and PREVENTING
EQUIPMENT PROBLEMS. To help you recognize this information, we use the
symbols below. Please read the manual and pay attention to these symbols.

hazardous situation which, if not
avoided, will result in death or serious

injury.

hazardous situation which, if not
avoided, could result in death or

serious injury.

_This product contains chemicals known to the State of California
to cause cancer, and birth defects or other reproductive harm. Wash hands after

handling.

_Some dust contains chemicals known to the State of California
to cause cancer, birth defects or other reproductive harm such as asbestos and

lead in lead based paint.

Indicates an imminently

hazardous situation which, if not
avoided, may result in minor or
moderate injury.

Indicates a potentially

not related to personal injury which,
if not avoided, may result in property

damage.

To reduce the risk of injury, read the instruction manual._\__J

Indicates a potentially

Indicates a practice

SAVE THESE INSTRUCTIONS

RISK OF EXPLOSION OR FIRE

WHAT CAN HAPPEN HOW TO PREVENT IT

= Itis norma! f0r e!ectdca! e Always operate the compressor

Contacts within the motor and in a well ventilated area free
piessure Switch to spark. , CombuStible materials,

• If electrical sparks from • If spraying flammable materials,
compressor come into contact locate compressor at least
with flammable vapors, they may 20' (6.1 m) away from spray

ignite, causing fire or explosion, area. An additional length of

gasoline, or solvent vapors.

air hose may be required.

• Store flammable materials
in a secure location away

from compressor.

3- ENG

Restricting any of the com-

pressor ventilation openings
will cause serious overheat-

ing and could cause fire.

• Never place objects against

or on top of compressor.

• Operate compressor in an open

area at least 12" (30.5 cm) away
from any wall or obstruction that

would restrict the flow of fresh
air to the ventilation openings.

e Operate compressor in a

clean, dry well ventilated area.

Do not operate unit in any

confined area. Store indoors.

Unattended operation of this prod-
uct could result in personal injury
or property damage. To reduce the
risk of fire, do not allow the com-

• Always remain in attendance with
the product when it is operating.

Always turn off and unplug

unit when not in use.

pressor to operate unattended.

'W

__ RISK TO BREATHING (ASPHYXIATION)

WHAT CAN HAPPEN

* The compressed air directly from

your compressor is not safe

breathing, The ai[ stream may
contain carbon monoxide, toxic

vapors, 0r solid particles from the air

tank. Breathing these c0ntaminants

• Never use air obtained directly

HOW TO PREVENT IT

from the compress0r t0 supply

air for human consumption. The

compressor is not equipped with

suitable filters and in.line safety

equipment for human consumption.

can cause serious injury or death:

Exposure to chemicals in dust
created by power sanding,
sawing, grinding, drilling,

and other construction
activities may be harmful.
Sprayed materials such as paint,

paint solvents, paint remover,

insecticides, weed killers, may
contain harmful vapors and poisons.

Work in an area with good cross
ventilation. Read and follow

the safety instructions provided

on the label or safety data
sheets for the materials you are
spraying. Always use certified
safety equipment: NIOSH/OSHA

respiratory protection or properly
fitting face mask designed for use
with our s ecific a lication.

4- ENG

I_ IR_r_ RISK OF BURSTING

Air Tank: On February 26, 2002, the U.S. Consumer Product Safety Commission

published Release # 02-108 concerning air compressor tank safety:

Air compressor receiver tanks do not have an infinite life. Tank life is dependent

upon several factors, some of which include operating conditions, ambient condi-

tions, proper installations, field modifications, and the level of maintenance. The

exact effect of these factors on air receiver life is difficult to predict.
If proper maintenance procedures are not followed, internal corrosion to the

inner wall of the air receiver tank can cause the air tank to unexpectedly rupture
allowing pressurized air to suddenly and forcefully escape, posing risk of injury to

consumers.

Your compressor air tank must be removed from service by the end of the year
shown on your tank warning label.

The following conditions could lead to a weakening of the air tank, and result in a
violent air tank explosion:

WHAT CAN HAPPEN HOW TO PREVENT IT

• Failure to properly dra!n condensed • Drain air tank daily Or after each use.
water from air tank, causing rust If air tank deve!ops a !eak, replace

and thinning of the Steel air tank, it immediate!y with a new air tank

or replace the entire compressor.

• Modifications or attempted
repairs to the air tank.

Never drill into, weld, or make any
modifications to the air tank or its

attachments. Never attempt to
repair a damaged or leaking air

tank. Replace with a new air tank.

o Unauthorized m0difications

to the safety Valve or any

other components which

control air tank pressure.

Attachments & accessories:

Exceeding the pressure rat-
ing of air tools, spray guns, air

operated accessories, tires,
and other inflatables can cause

them to explode or fly apart, and
could result in serious injury.

e The air tank is designed to withstand

specific operating pressures.

Never make adjustments or
parts Substitutions to alter the

factory set operating pressures.

Follow the equipment manufacturers
recommendation and never exceed

the maximum allowable pressure

rating of attachments. Never use
compressor to inflate small low
pressure objects such as children's

toys, footballs, basketballs, etc.

5- ENG

_-_ RiSK OF ELECTRICAL SHOCK

WHAT CAN HAPPEN

Your compressor is powered by
electricity. Like any other electrically

powered device, if it is not used
properly it may cause electric shock.

• Never operate the compressor

HOW TO PREVENT iT

outdoors when it is raining
or in wet conditions.

Never operate compressor

with protective covers

removed or damaged.

• Repairs attempted by unqualified
personnel Can result in serious

• Any electrical wiring or repa!rs
required on this product should be

injury or death by electrocution: performed by authorized service

' centei personne! in aCcordanCe with

national and local electrical code&

Electrical Grounding: Failure to
provide adequate grounding to this
product could result in serious injury

or death from electrocution. Refer to
Grounding instructions paragraph

Make certain that the electrical
circuit to which the compressor

is connected provides proper
electrical grounding, correct voltage
and adequate fuse protection.

in the Installation section.

__ RiSK FROM FLYING OBJECTS

WHAT CAN HAPPEN

The compressed air stream can
cause soft tissue damage to

exposed skin and can propel dirt,
chips, loose particles, and small

objects at high speed, resulting in

property damage or personal injury.

HOW TO PREVENT iT

Always wear certified safety

equipment: ANSI Z87.1 eye
protection (CAN/CSA Z94.3)

with side shields when

using the compressor.
Never point any nozzle or sprayer

toward any part of the body or

at other people or animals.

Always turn the compressor

off and bleed pressure from

the air hose and air tank before

attempting maintenance,
attaching tools or accessories.

6- ENG

__ RiSK OF HOT SURFACES

WHAT CAN HAPPEN HOW TO PREVENT iT

• Touching exposed metal such Never touch any exposed metal
as the compresSor head, engine parts on compressor during or

head, engine exhaust or outlet immediately after operation.

tubes, can result in serious burns. Compressor wi!l remain hot for

several minutes after Operation.

,' D0n0t reach around protective

shrouds or attempt maintenance

until unit has been allowed to cool.

WHAT CAN HAPPEN

Moving parts such as the pulley,
flywheel, and belt can cause
serious injury if they come into
contact with you or your clothing.

0 Attempting to operate compressor

with damaged or missing parts or
attempting to repair compressor

with protective shrouds removed

can exPOSe you to moving parts

and can result in serious injury.

HOW TO PREVENT iT

• Never operate the compressor
with guards or covers which

are damaged or removed.
Keep your hair, clothing, and

gloves away from moving parts.
Loose clothes, jewelry, or long hair
can be caught in moving parts.

Air vents may cover moving parts

and should be avoided as well.

e Any repairs required on this product

should be performed by authorized

service center personnel.

7- ENG

__ RiSK OF UNSAFE OPERATION

WHAT CAN HAPPEN HOW TO PREVENT iT

• Unsafe operation of your • Review and understand all
compressor could lead to serious instructions and warnings

injury or death to you or others, in this manual.

• Become familiar with the operation
and controls of the air compressor.

Keep operating area clear of all
persons, pets, and obstacles.

Keep children away from the
air compressor at all times.

Do not operate the product

when fatigued or under the

influence of alcohol or drugs.
Stay alert at all times.

Never defeat the safety fea-

tures of this product.

Equip area of operation

with a fire extinguisher.

Do not operate machine

with missing, broken, or

unauthorized parts.

__ RiSK OF FALLING

WHAT CAN HAPPEN HOW TO PREVENT IT

= Ap0rtable compressor can fa!I e Always operate compressor in a

from a table, workbench, or roof stable secure position to prevent
causing damage to the c0mpress0r accidental movement of the un t.
and could result in serious injury Never operate compressor on a

Or death to the oPerator., roof or other e!evated Position. Use

additional air h0se tO reach high ....

locations:

8- ENG

__ RiSK OF iNJURY FROM LiFTiNG

WHAT CAN HAPPEN HOW TO PREVENT iT

= Serious injurycan result = The compressor is too heavy to be

from attempting to lift lifted by one person. Obtain assis-
too heavy an object, tance from others before lifting.

RISK FROM NOISE

WHATCANHAPPEN I HOWTOPREVENTiT

• Under some conditions and durationlo Always wear Certified safety
of use; noise from this Pr0duct equipment: ANSI S12:6
may contribute to hearing loss: I (S3.19) hearing protection.

SAVE THESE INSTRUCTIONS

FOR FUTURE USE

Model No. 921.165720

Running Horsepower 1.7 *
Bore 2.875" (73.025 mm)
Stroke 1.45" (36.83 mm)
Voltage 120
Hz-Single Phase 60
Minimum Branch Circuit Requirement 15 amps
Fuse Type Time Delay
Air Tank Capacity (Gallon) 33 (124.9 liters)

Maximum Air Pressure 165 PSi
Approximate Cut-in Pressure 135 PSIG

Approximate Cut-out Pressure 165 PSIG
SCFM @ 40 PSi 6.8 *

SCFM @ 90 PSi 5.1 *
* Tested per ISO 1217

Refer to Glossary for abbreviations.

Air Filter
Porous element contained within a

metal or plastic housing attached to
the compressor cylinder head which

removes impurities from the intake air of
the compressor.

Air Tank
Cylindrical component which contains
the compressed air.

Check Valve
Device that prevents compressed air

from flowing back from the air tank to
the compressor pump.

Cut-In Pressure
The low pressure at which the motor will

automatically restart.
Cut-Off Pressure

The high pressure at which the motor
will automatically shut off.

Electric Motor
Device which provides the rotational

force necessary to operate the

9- ENG

compressor pump.
NPT (National Pipe Thread)

A seal thread tape must be used to
provide a leak-free seal on pipe threaded

connections.
Pressure Regulator Knob

Regulates the outgoing pressure from
the air outlet to the tool. It is possible to
increaseor decrease the pressure at the

outlet by adjusting this control knob.
Pressure Switch

Automatically controls the on/off
cycling of the compressor. It stops the

compressor when the cut-off pressure
in the tank is reached and starts the

compressor when the air pressure drops
below the cut-in pressure.The pressure
switch will not automatically start and
control the compressor unless the
manual AUTO/Off Switch isin the

AUTO position.
PSI (Pounds Per Square inch)

Measurement of the pressure exerted
by the force of the air. The actual PSi is

measured by a pressure gauge on the
compressor.

Pump
Produces the compressed air with a
reciprocating piston contained within the

cylinder.
Regulator Pressure Gauge

Displays the current line pressure. Line
pressure isadjusted by rotating the
pressure regulator knob.

Pressure Relief Valve
Prevents air pressure in the air tank from

rising over a predetermined limit.
SCFM (Standard Cubic Feet Per Minute)

A unit of measure of air delivery.
Tank Pressure Gauge

indicates the pressure in the air tank.
Thermal Overload Switch

Automatically shuts off the compressor
ifthe temperature of the electric motor
exceeds a predetermined limit.

This air compressor pump iscapable of running continuously. However, to prolong
the life of your air compressor, it is recommended that a 50%-75% average duty

cycle be maintained; that is,the air compressor pump should not run more than 30-
45 minutes in any given hour.

Accessories for this unit are available at the store the unit was purchased.

The use of any other accessory not recommended for use with this tool could
be hazardous. Use only accessories rated equal to or higher than the rating of
the air compressor.

10- ENG

I PowerSwitch

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11- ENG

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Check Valve

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ASSEMBLING THE COMPRESSOR

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 information.

Unpack the air compressor. Inspect the unit for damage. If the unit has been
damaged in transit, contact the carrier and complete a damage claim. Do this i
mmediately because there are time limitations to damage claims.

2.

Check the compressor's serial label to ensure that you have received the model
ordered, and that it has the required pressure rating for its intended use.

3.

Locate the compressor according to the following guidelines:
a. Position the compressor near a grounded electrical outlet.

b. The compressor must be at least 12 inches (31 cm) from any wall or

obstruction, in a clean, well-ventilated area, to ensure sufficient air flow and
cooling.

c. In cold climates, store portable compressors in a heated building when

not in use. This will reduce problems with motor starting and freezing of
water condensation.

d. Remove the compressor from the carton and place it on the floor or a hard,

level surface. The compressor must be level to ensure proper drainage of
the moisture in the tank.

12- ENG

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.

Risk Of Fire Or Explosion
This product incorporates snap action switch contacts and a universal electric

motor which tends to produce arcs and sparking and therefore should not
be exposed to flammable liquids or vapors. This product is not intended for
installation or use in a commercial garage or shop environment.

Grounding instructions

This product must 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 Figure 3.) 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.

Improper installation of the grounding plug will result

_ n 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 nominal 120-V circuit and has a grounding plug
similar to the plug illustrated in (Figure 3). Only connect the product to an outlet
having the same configuration as the plug. Do not use an adapter with this
product.

13- ENG

GETTING STARTED

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 50 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.

Figure 3

Grounded Outlet

Box

120 VOLTS

Plug _ Grounding Pin

Grounded Out et

14- ENG