Craftsman 921.165720 User 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.
•Safety instructions
•Installation & Operation
•Maintenance &Storage
•Troubleshooting Guide
• Parts List
•EspaSol, p. 24
Sears Brand Management Corporation, Hoffman Estates, IL 60179
U.S.A.
www.sears.com/craftsman
04/12/2013
Part No. E106178

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.
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.
Indicates a practice
not related to personal injury which,
if not avoided, may result in property
damage.
_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.
To reduce the risk of injury, read the instruction manual._\__J
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,
gasoline, or solvent vapors.
• 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
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.
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-
pressor to operate unattended.
'W
• 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.
• Always remain in attendance with
the product when it is operating.
Always turn off and unplug
unit when not in use.
__ 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
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.
HOW TO PREVENT IT
•Never use air obtained directly
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.
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.
o Unauthorized m0difications
to the safety Valve or any
other components which
control air tank pressure.
and other inflatables can cause
them to explode or fly apart, and
could result in serious injury.
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.
e The air tank is designed to withstand
specific operating pressures.
Never make adjustments or
parts Substitutions to alter the
factory set operating pressures.
Attachments & accessories:
Exceeding the pressure rat-
ing of air tools, spray guns, air
operated accessories, tires,
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.
• Repairs attempted by unqualified
personnel Can result in serious
HOW TO PREVENT iT
• Never operate the compressor
outdoors when it is raining
or in wet conditions.
Never operate compressor
with protective covers
removed or damaged.
• 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
in the Installation section.
Make certain that the electrical
circuit to which the compressor
is connected provides proper
electrical grounding, correct voltage
and adequate fuse protection.
__ RiSK FROM FLYING OBJECTS
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.
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.
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
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.
and can result in serious injury.
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!Ie 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

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.
2.
3.
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.
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.
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
Grounded Out et
120 VOLTS
Plug _ Grounding Pin
14- ENG

DAILY STARTUP (Figure4)
1. Set the Power Switch to the Off position. (A)
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 dealer before use.
3. Close the drain valve. (B)
4. 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. (C)
5. Plug the power cord into the proper receptacle. (D)
6. Turn the Power Switch to the On position and the compressor will start
and build air pressure in the tank to cut-out pressure and then shut off
automatically. (A)
7. 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. (E)
Figure 4
SHUTDOWN (Figure 4)
1. Set the Power Switch to the Off position. (A)
2. Unplug the power cord from the receptacle. (D)
3. Set the outlet pressure to zero on the regulator. (E)
4. Remove any air tools or accessories.
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. (B)
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.
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. 15- ENG

To avoid personal injury, always shut off and unplug the
compressor and relieve all air pressure from the system before performing any
service on the air compressor.
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 adaily basis.
This compressor is
items to Check/Change
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Before each use
or daily
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equipped with an automatic reset thermal overload protector which will shut off
motor if it becomes overheated, if the thermal overload protector is actuated, the
motor must be allowed to cool down before start-up is possible.
NOTE: The motor will automatically restart without warning if the unit is left
plugged in to an outlet with the Auto-On/Off switch in the on position.
DRAINING THE TANK
Condensation will accumulate in the
tank. To prevent corrosion of the tank from the inside,
this moisture must be drained at the end of every
workday. Be sure to wear protective eyewear. Relieve the
air pressure in the system and open the drain valve on
the bottom of the tank and tilt tank to drain.
Figure 5
NOTE: In cold climates, drain the tank after each use to reduce problems with
freezing of water condensation.
CHECKING THE SAFETY VALVE (Figure 5)
Check the safety valve by performing these three steps:
1. Plug the compressor in and run until shut-off pressure is reached.
2. Wearing safety glasses, pull out on the safety valve ring to release pressure
from the tank.
3. The safety valve should close automatically at approximately at 40-50 PSi.
if the safety valve does not allow air to be released when you pull out
on the ring, or does not close automatically, it must be replaced.
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.
16- ENG

Risk of Unsafe Operation. Unit cycles automatically when
power is on. When servicing, you may be exposed to voltage sources, com-
pressed air, or moving parts. Before servicing unit unplug or disconnect elec-
trical supply to the air compressor, bleed tank of pressure, and allow the air
compressor to cool.
PROBLEM CAUSE CORRECTION
Low pressure or Tank drain valve is open Close drain valve
not enough air Fittings leak Check fittings with soapy water.
or Compressor Tighten or reseal leaking fittings.
does not stop DO NOT OVERTIGHTEN.
Restricted air intake Clean or replace intake filter element.
Decrease amount of air used.
Prolonged excessive
use of air
Compressor not
large enough
Hole in air hose
Tank leaks
Blown seals
Valve leaks
Leaking or worn piston Replace piston.
Air leaks from Dirty or damaged Replace regulator or internal parts.
regulator, or regulator internal parts.
regulator does
not regulate
pressure
Check air requirement of accessory.
If it is higher than CFM and
3ressure supplied by compressor,
/ou need a larger compressor.
Most accessories are rated at 25% of
actual CFM while running continuously.
Check and replace if necessary.
immediately replace
tank. DO NOT attempt to repair.
Replace seals.
Replace seals.
17- ENG

PROBLEM
Regulated
pressure
gauge reading
drops when
air accessow
is being used
CAUSE
This is normal
Compressor not
large enough
Pressure relief Tank pressure
valve opens exceeded normal
operating pressure
Pressure switch stuck
Motor will Tank pressure exceeds
not run preset pressure switch
limit
Make sure the Thermal
Overload Switch has not
tripped. The motor has
a built in thermal cut out
that trips when necessaw
to protect the motor
from damage when
overheated.
Fuse blown or circuit
breaker tripped
CORRECTION
If pressure drops too low, adjust
regulator while accessow is used.
Check air requirement of accessory.
If it is higher than CFM and pressure
supplied by compressor, you need a
larger compressor. Most accessories
are rated at 25% of actual CFM
while running continuously.
Replace pressure switch
Replace pressure switch
Motor will start automatically when
tank pressure drops below cut- in
3ressure of pressure tank.
To reset the motor overload toggle
turn the Power Switch to the OFF
3osition and unplug the unit from
the power outlet. Allow 10 minutes
(minimum) for motor overload cut-
out to cool and reset. Unit can then
be plugged in and re-started.
• Replace blown fuse or reset circuit
breaker. Do not use fuse or circuit
breaker with higher rating than
specified for your branch circuit.
Check for proper fuse; "Fusetron"
type T is acceptable.
Check for low voltage and
proper extension cord size.
Disconnect other applications
from circuit. Operate compressor
on a dedicated circuit.
Check valve stuck open Remove and clean or replace.
Wrong wire gauge in cord Check for proper gauge and extension
or excessive extension cord length.
cord length
Loose electrical Contact authorized service center.
connections
Paint spray on internal Have checked at service center. Do
motor parts not operate compressor in the paint
spray area
Possible defective motor Have checked at service center.
18- ENG

PUMP/MOTOR ASSEMBLY
%/
d
®
REF, NO PART NO. DFSCRJPTJON QTY
1 E106663 Pulley 1
2 E106664 Belt 1
3 E106665 Fan 1
4 E106666 Screw 1
5 E106667 Flywheel 1
6 E106668 Screw 1
7 E106669 Screw 4
8 E106670 Valve Plate Kit 1
9 E106671 Conrod Kit 1
10 E106672 Head 1
19- ENG

921.165720
• --oJ
20- ENG