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Assembly & Instruction Manual ITEM 1221
4 Gallon Twin Stack
Air Compressor
THANK YOU FOR BUYING CUMMINS INDUSTRIAL TOOLS
You can purchase additional items at
www.cumminstools.com
Customer Service Postal Address:
1290 35 Road
Minden, NE 68959
Voice: 1-(308) 832-2070
Fax: 1-(308) 832-2069
Your new 4 Gallon Twin Stack Air Compressor has been engineered and manufactured to Cummins Industrial Tools high standards for
dependability, ease of operation, and operator safety . Pay close attention to the Rules for Safe Operation, Warnings, and Cautions. If you
use your machine properly and only for what it is intended, you will enjoy years of safe, reliable service.
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TABLE OF CONTENTS
INTRODUCTION ………………………………….………….…………….…………………….…..…………..
1
GENERAL SAFETY RULES ….....………. .……...…….……….……………………………………………....
2
SPECIFIC SAFETY RULES ….…………………..…….….…...…………….………………………………....
3
GENERAL INFORMATION ………………………………………………………………………………………
4
FEATURES ………………..…………………………………………...….......................................................
4
PRODUCT SPECIFICATIONS …….…….……………….…..……………….…...........................................
4
UNPA CKING ……………..……………………….………………….....….....................................................
5
P ACKI NG LIST ……………………………………………..... …........ .......... .......... .......... .......... .......... ..........
5
APPLICATIONS ………..…………………………………………………….................................... ...............
5
OPERA TIO N ………………..…………………………………………...…. ................................................ ....
5
MAINTENANCE ……………..……………………….………………….........................................................
6
TROUBLESHOOTING ……………………………………………………………………………………………
7
EXPLODED DIAGRAM ……..………………………………………....................... ......................................
8
PARTS LIST ……..…………….……………………………...…................... ................................................
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INTRODUCTION
THIS PRODUCT has many features for making the use of this product more pleasant and enjoyable. Safety,
performance, and dependability have been given top priority in the design of this product making it easy to
maintain and operate.
Look for this symbol to point out important safety precautions. It means attention!!!
Your safety is involved.
WARNING: The operation of any tool can result in foreign objects being thrown
into your eyes, which can result in severe eye damage. Before beginning operation,
always wear safety goggles or safety glasses with side shields and a full face shield
when needed. We recommend Wide Vision Safety Mask for use over eyeglasses or
standard safety glasses with side shields. Always wear eye protection which is
marked to comply with ANSI Z87.1.
WARNING: Do not attempt to use this product until you thoroughly read and completely
understand the operator’s manual. Pay close attention to the safety rules, including Dangers,
Warnings, and Cautions. If you use your product properly and only as intended, you will enjoy
years of safe, reliable service.
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GENERAL SAFETY RULES
Work area condition. Cluttered areas invite
injuries.
Additional work area conditions. Do not use
machines or power tools in damp or wet
locations. Do not expose to ra in. Keep work area
well lighted.
Keep children away. Children must never be
allowed in the work area. Do not let them handle
machines, tools or extension cords.
Store idle equipment. When not in use, tools
must be stored in a dry location to inhibit rust.
Always lock up tools and keep out of reach of
children.
Use the right tool for the job. Do not attempt
to force a small tool or attachment to do the work
of a larger industrial tool. There are certain
applications for which this tool was designed. It
will do the job better and more safely at the rate
for which it was intended. Do not modify this tool
and do not use this tool for a purpos e for whic h it
was not intended.
Dress properly.
Do not wear loose clothing or
jewelry as they can be caught in moving parts.
Protective, electrically non-conductive clothes
and non-skid footwear are recommended when
working. Wear restrictive hair covering to contain
long hair .
Use eye protection.
Always wear ANSI
approved impact safety glasses underneath a full
face shield during use. Also wear heavy duty
work gloves.
Do not overreach. Keep proper footing and
balance at all times. Do not reach over or across
running machines.
Maintain tools with care. Keep tools sharp and
clean for better and safer performance. Follow
instructions for lubricating and changing accessories.
The handles must be kept clean, dry, and free from
oil and grease at all times.
Remove adjusting keys and wrenches. Check
that keys and adjusting wrenches are removed from
the tool or machine work surface before starting
work.
Stay alert. Watch what you are doing, use common
sense. Do not operate any tool when you are tired.
Check for damaged parts. Before using any tool,
any part that appears damaged should be carefully
checked to determine that it will operate properly and
perform its intended function. Any part that is
damaged should be replaced.
Replacement parts and accessories. When
servicing, use only identical replacement parts. Use
of any other parts will void the warranty. Only use
accessories intended for use with this tool. Approved
accessories are available from Cummins Industrial
Tools.
Do not operate tools if under the influence of
alcohol or drugs. Read warning labels on
prescriptions to determine if your judgment or
reflexes are impaired while taking drugs. If there is
any doubt, do not operate the tool.
WARNING: When using tool, basic safety precautions should always be followed to reduce
the risk of personal injury and damage to equipment. Read all instructions before using the tool.
WARNING: The warnings, cautions, and ins tructions discussed in this instruction manual
can not cover all possible conditions and situations that may occur. It must be understood by the
operator that common sense and caution are factors which can not be built into this product, but
must be supplied by the operator.
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SPECIFIC SAFETY RULES
Read all instructions before using this product
Electrical shock hazard
Never use the compressor without connection to a properly grounded outlet with the specified voltage and
fuse protection.
Do not use the compressor in a wet or explosive environment.
Never attempt maintenance or adjustment with power connected or the equipment in operation.
Tank safety valve
This valve is factory installed to prevent the air receiver from damage should a malfunction occur in the
compressor pump.
It is factory set at a specified limit for your particular model. Any adjustment tampered by user will
automatically void the warrant.
Pressure switch
The air pressure switch is set at the fac tory for optimum performance o f your equipment. Never b ypass or
remove this switch as serious damage to eq uipment or personal injury could result from too high an air
pressure.
Motor and compressor pump
Air compressor get hot while in operation. Never touch the motor, discharge tubing, or compressor pump
while in operation.
The compressor operates automatically while the power is connected.
Never attempt any adjustment with the power on.
Compressed air caution
Compressors air from the unit may contain carbon monoxide. Air produced is not suitable for breathing
purposes.
Always use a respirator when spraying paint or chemicals.
Always wear safety glasses or goggles when spraying air.
Air receiver
Over pressurizing the air receiver could cause an explosion or rupture. To protect from over pressurizing a
factory preset safety valve is included. Do not remove, make adjustments or substitutions for this valve.
Occasionally pull the ring on the valve to make sure that the valve operates freely. If the valve does not
operate freely it must be replaced. Never weld to, drill into, or change the air receiver in any way.
If any of the above conditions are changed or tampered with, this will re sult in voiding of the manufacture’s
warranty. Be advised that any replacement parts should be purchased w ith the same specifications as th e
original equipment. Please contact an authorized dealer for replacement parts or specification.
Others
Do not smoke while operating the air compressor. To avoid the ignition of a fire or explosion, never spray
where sparks or flame is present.
Keep the compressor away from children and those who are unfamiliar with the unit operation.
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GENERAL INFORMATION
General description of operation
To compress air, the pistons move up and down in the cylinder. On the down stroke, air is drawn in through the
valve inlet. The discharge valve remains closed. On the up stroke, air is compressed. The inlet valve closes and
compressed air is forced out through the discharge valve through the check valve and into the receiver.
Working air is not available until the compressor has raised the air receiver’s pressure above the required
compression at the air service connection. The air inlet filter openings must be kept clear of obstructions, which
could reduce air delivery of the compressor.
Installation and location
Locate the compressor in a clean, dry and we ll-ventilated area. The compressor should be located 12 to 18
inches from a wall or any other obstruction that would interfere with the air flow through the fan blade belt wheel.
Place the compressor on a firm level surface. The compressor is designed wi th heat dissipation fins that allow
for proper cooling. Keep the fins and other parts that collect dust or dirt clean. A clean compressor runs cooler
and provides longer service. Do not place rags, containers, or other material on top of the compressor.
Assembly
1. Remove air filter from plastic bag and screw it into the thread hole. Be sure to always clean air filter before
and after each use.
2.
This compressor is completely assembled. It does not need further settings.
FEATURES
Twin stack tanks
50% Duty cycle
Single phase
Single stage
Tank with one regulator, one coupler and two gauges
Oil lubrication for long life
Direct drive compressor pump
Thermal overload protection for safety and reliability
PRODUCT SPECIFICATIONS
1.5HP
4 gallon
4.2 SCFM @ 90 PSI, 5.2 SCFM @ 40 PSI
115 maximum PSI
115V, 60 Hz, 15 Amp
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UNPACKING
INSTRUCTIONS
When unpacking the tool:
Carefully remove the tool and accessories from the box.
Make sure that all items listed in the packing list are included.
Inspect the tool carefully to make sure no breakage or damage
occurred during shipping.
Do not discard the packing material until you have carefully inspected and satisfactorily operated the tool.
PA C KI N G L IS T
Twin Stack Air Compressor
Air Filter
APPLICATIONS
Depending on the C.F.M. draw of the tools being operated, your new air compressor can be used for operating:
Paint Sprayers Sandblasters
Air tools
Inflating tires and plastic toys
Grease guns
Spraying weed killer and insecticides
Airbrushes Etc.
Caulking guns
An air pressure regulator is usually necessary for most of these applications.
OPERATION
Starting the compressor
1.
Make sure the amount of oil is adequate before each use.
2. Check all nuts and screws for secured tightness.
3.
Make sure wiring fuse and power supply is correctly installed.
4.
Make sure all pressure and water is released from tank.
5.
Turn on power switch. Then pressure inside the tank will increase unti l it reaches 90 PSI. The system will
then automatically shut down at this point.
WARNING: If any part is
missing do not operate the tool
until the missing part is replaced.
Failure to do so could result in
p
ossible serious personal injury.
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6.
Connect air tool and start the compressor to begin use. Note : be sure to check manufacturer ’s maximum
pressure rating for air tools and accessories. Compressor outlet pressure must be regulated to never
exceed the maximum pressure rating of the tool.
7.
Use the regulator knob to control the amount of air pressure for the attached air tool. Turn the knob
clockwise to increase air pressure and counterclockwise to reduce air pressure.
8.
To enable the best air pressure release and avoid air leakage, use Teflon tape to wrap around hose and
coupler thread.
Air release
1. Turn the power switch off after each use of the compressor.
2.
Open drain valve underneath the tank and release all the air and moisture inside.
3.
The pressure gauge should now fall back to 0 PSI.
4.
Release all the air from the attached air tool, then disconnect hose from the quick coupler.
MAINTENANCE
CHECKLIST
Daily or before each use
1.
Check oil level
2.
Drain condensation from tank
3.
Check for any unusual noise or vibration
Weekly
1.
Clean air filter by opening air filter cap. Remove the filter element and clean thoroughly with soap and water.
Rinse thoroughly and allow to dry completely before assembling.
2.
Clean breather holes on oil check dipstick.
Monthly
1. Inspect air system for leaks by applying soapy water to all joints. Tighten those joints if leakage is observed.
250 hours or six (6) months (whichever comes first)
1.
Change compressor oil.
2. Replace oil more often if compressor is used near paint spraying operations or in dusty environments.
CAUTION:
Before performing any maintenance to your air compressor, disconnect electrical
p
ower and drain air tank of pressure.
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COMPRESSOR LUBRICATION
Compressor with oil level sight glass
1.
Sit air compressor on level surface. The oil level should be at the red dot on the oil level sight glass.
2.
If oil level is low, remove oil fill plug, add enough oil to bring level to the red dot in the oil level sight glass.
Draining the oil
1.
Remove the oil drain plug. Allow oil to drain completely.
2.
Replace the oil drain plug (we recommend the use of a sealing compound or Teflon tape to avoid leakage).
3. Refill with the recommended oil to the red dot in the oil level sight glass.
TROUBLESHOOTING
Trouble
Possible cause
Corrective action
No start condition
Fuse blown or circuit breaker tripped
Loose electrical connections
Overheated motor
Check for cause of blown fuse/breaker and replace or reset
Check wiring connections
Press the reset button or wait for automatic reset
Low pressure
Air leak in safety valve
Restricted air filter
Defective check valve
Check valve manually by pulling upward on rings. If condition
persists replace valve
Clean or replace as necessary
Replace check valve
Safety valve
releasing
Defective pressure switch or improper
adjustment
Check for proper adjustment and if problem persists, replace
pressure switch
Oil discharge in air
Improper oil viscosity
Too much oil in crankcase
Compressor overheated
Restricted air filter
Replace oil with SAE30 or SAE20 weight non-detergent oil
Drain crankcase and fill to proper level
Air pressure regulated too high
Clean or replace filter
ATTENTION: Check the oil quantity and quality before operating the compressor. Do no
t
add or change oil while the compressor is in operation. Use only SAE20 or SAE30 weight
non-detergent oil.
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EXPLODED DIAGRAM
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PARTS LIST
For assistance in solving parts problems please refer to the parts and components for our a ir compressors by
number. When a new replacement is needed, include the model number of the air compressor, part number and
quantity required.
If a new assembly is required, include the model number of the air compresso r undergoing repair (according to
the nameplate), the part name, part number and quantity required according to the number of the parts
diagram.
During the break-in period, nuts and bolts have a tendency to loosen u p. Tighten all nuts and bolts including
head bolts after two weeks, then check everything once a month to make sure all nut s and bolts stay tight.
INDEX # P ART # DESCRIPTION QTY.
1 90002-01 Crankcase 1
2 90002-02 Crank 1
3 90002-03 Gasket 1
4 90002-04 Crankcase cover 1
5 90002-05 Oil plug 1
6 90002-06 Gasket 1
7 90002-07 Oil glass 1
8 90002-08 Bolt 1
9 90002-09 Spring washer 1
10 90002-10 Breather 1
11 90002-11 Bolt 1
12 90002-12 Connecting rod 1
13 90002-13 C-clip 1
14 90002-14 Piston pin 1
15 90002-15 Piston 1
16 90002-16 Oil ring 2
17 90002-17 Air ring 1
18 90002-18 Cylinder gasket 1
19 90002-19 Cylinder 1
20 90002-20 Spring washer 1
21 90002-21 Bolt 1
22 90002-22 Valve plate gasket 1
23 90002-23 Valve seat 1
24 90002-24 Valve plate 1
25 90002-25 Aluminum gasket 1
26 90002-26 Cylinder head gasket 1
27 90002-27 Elbow 1
28 90002-28 Cylinder head 1
29 90002-29 Spring washer 4
30 90002-30 Bolt 4
31 90002-31 Muffler 1
32 90002-32 capacitor 1
INDEX # PART # DESCRIPTION QTY.
34 90002-34 Bolt 1
35 90002-35 Plastic cover 1
36 90002-36 Bolt 1
37 90002-37 Fan 1
38 90002-38 Back bearing cover 1
39 90002-39 Motor stator 1
40 90002-40 Bearing 1
41 90002-41 Motor rotator 1
42 90002-42 Bearing 1
43 90002-43 Oil seal 1
44 90002-44 Air tank 1
45 90002-45 Drain valve 1
46 90002-46 Bolt 4
47 90002-47 Washer 4
48 90002-48 Rubber foot 4
49 90002-49 Washer 4
50 90002-50 Screw nut 4
51 90002-51 Handle grip 1
52 90002-52 Safety valve 1
53 90002-53 Pressure switch 1
54 90002-54 Pressure gauge 1
55 90002-55 Nipple 1
56 90002-56 Regulator 1
57 90002-57 Air valve 1
58 90002-58 Pressure gauge 1
59 90002-59 Unloading pipe nut 2
60 90002-60 Unloading pipe 1
61 90002-61 Elbow 1
62 90002-62 Check valve 1
63 90002-63 Exhaust pipe unit 2
64 90002-64 Exhaust pipe 2
65 90002-65 Plug 1
66 90002-66 Power cable 1
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