Northern Industrial Tools Air Compressor 123006 User Manual

2 HP / 4 GALLON  
AIR COMPRESSOR  
OPERATING MANUAL  
Item # 123006  
 
16. Check for damage. Check your tool regularly. If  
part of the tool is damaged it should be carefully  
inspected to make sure that it can perform its  
intended function correctly. If in doubt, the part  
should be repaired. Refer all servicing to a  
qualified technician. Consult your dealer for advice.  
17. Keep away from flammables. Do not attempt to  
operate this tool near flammable materials or  
combustibles. Failure to comply may cause  
serious injury or death.  
18. Store idle tools out of the reach of children and  
untrained persons. Tools may be dangerous in  
the hands of untrained users.  
19. Maintain tools with care. Keep tools sharp and  
clean. Properly maintained tools, with sharp  
cutting edges, are less likely to bind and are  
easier to control.  
20. Never exceed the pressure rating of any  
component in system.  
SAFETY RULES  
1. Know your tool. Read this manual carefully.  
Learn the tool’s applications and limitations, as  
well as specific potential hazards peculiar to it.  
2. Ground all tools. If the tool is equipped with three-  
pin plug, it should be plugged into a three-pin  
electrical socket. Never remove the ground pin.  
3. Avoid body contact with grounded surfaces such  
as pipes, radiators, ranges, and refrigerators.  
There is an increased risk of electric shock if  
your body is grounded.  
4. Do not expose tool to moisture. Don’t use this  
tool in damp or wet locations. Keep out of rain.  
5. Do not abuse cord. Never use the cord to carry  
tools or pull the plug from an outlet. Keep cord  
away from heat, sharp edges or moving parts.  
Replace damaged cords immediately. Damaged  
cords increase the risk of electric shock.  
6. Remove adjusting keys or wrenches before  
turning the tool on. A wrench or key that is left  
attached to a moving part of the tool may result  
in personal injury.  
7. Keep work area clean and well lit. Cluttered or  
dark work areas invite accidents.  
8. Keep children away. All children should be kept  
away from the work area. Never let a child  
handle a tool without strict adult supervision.  
9. Do not operate this tool 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 attempt to operate.  
10. Use safety equipment. Eye protection should be  
worn at all times when operating this tool. Use  
ANSI approved safety glasses. Everyday  
eyeglasses are NOT safety glasses. Dust mask,  
non-skid safety shoes, hard hat, or hearing  
protection should be used in appropriate  
conditions.  
11. Wear proper apparel. Loose clothing, gloves,  
neckties, rings, bracelets, or other jewelry may  
present a potential hazard when operating this  
tool. Please keep all apparel clear of the tool.  
12. Don’t overreach. Keep proper footing and  
balance at all times when operating this tool.  
13. Always disconnect the tool from power source  
before making any adjustments, storing,  
21. Protect material and air lines from damage or  
puncture. Keep hose and power cable away  
from sharp objects, moisture, chemicals, oil, etc.  
22. Check condition of hoses before each use. Do  
not use a damaged hose. If hose is damaged,  
replace immediately.  
23. Read, understand and comply with all warning  
labels on unit.  
24. Drain tank of moisture after each use. If  
Compressor is not to be used for extended  
periods of time, leave tank drain valve open to  
allow moisture to completely drain from tank.  
25. Do not tamper with Safety Valve. The Safety  
Valve is factory set for your model air  
compressor. Any use adjustments to Safety  
Valve will automatically void warranty.  
26. Air compressors get hot while in operation.  
NEVER touch the motor, discharge tubing or  
compressor pump while in operation.  
27. The Compressor operates automatically while  
the motor is turned on.  
28. Compressed air from the unit may contain  
carbon monoxide. Air produced is not suitable  
for breathing purposes.  
29. Always use a respirator when spraying paint  
or chemicals.  
30. The air pressure switch is set at the factory for  
optimum performance of your equipment. Never  
attempt to bypass or remove this switch as  
serious damage to equipment or personal injury  
could result from excessive air pressure.  
servicing, or changing accessories. Such  
preventative safety measures reduce the risk of  
starting the tool accidentally.  
14. Do not force tool. Use the correct tool for your  
application. The correct tool will do the job better  
and safer at the rate for which it was designed.  
15. Do not use the tool if the switch does not turn it  
on and off. Any tool that cannot be controlled with  
the switch is dangerous and must be repaired.  
2
 
Note: Always make sure that compressor Power  
Switch is in the OFF position before  
KNOW YOUR COMPRESSOR  
Air  
performing any maintenance or plugging the  
compressor into a power supply.  
Handle  
Filter  
Pressure Gauges: These dual gauges indicate the  
amount of air pressure built up in the air tank, as  
well as the air pressure being delivered to the air  
chuck.  
Power Switch  
Safety Valve: The Safety Valve device relieves  
pressure from the Air Tank in the event of excessive  
pressure build up. The Safety Valve is preset at  
factory. Do not attempt to make any adjustments to  
the Safety Valve. Periodically pull ring on the Safety  
Valve end to check that it is working properly.  
Air Tank: Powder coated steel tank, with a 4 gallon  
capacity, stores the compressed air until it is needed.  
Air Regulator  
Oil  
Breather  
Cap  
Air  
Chuck  
GETTING STARTED  
Before operating your tool, check the contents of  
the box to make sure you have everything you will  
need.  
Safety  
Valve  
Pressure  
Gauges  
Items included in the box:  
Air Compressor  
Air Filter  
Air  
Tank  
Tank Drain Valve  
Oil Breather Cap  
Bottle of Oil  
(located on tank bottom)  
Figure 1. Air Compressor  
Owner’s Manual  
Handle: Convenient, rubber gripped handle allows  
for easy transport of your air compressor.  
Air Regulator: The air regulator controls the air  
flow pressure. Turn regulator clockwise to increase  
air pressure, counter-clockwise to decrease air  
pressure.  
Air Chuck: Convenient quick disconnect air chuck  
allows for fast, easy connection to an air hose.  
Tank Drain Valve: The Tank Drain Valve can be  
opened to allow moisture and compressed air to be  
released from the Air Tank.  
ASSEMBLY  
NOTE: Before performing any assembly or  
maintenance make sure compressor is turned off  
and unplugged from the power supply.  
Installing the Oil and Oil Breather Cap  
Your air compressor is shipped without oil in the  
crankcase. BEFORE STARTING THE AIR  
COMPRESSOR YOU MUST ADD OIL TO THE  
CRANKCASE AS DESCRIBED BELOW:  
1. Place compressor on level ground.  
2. Remove the Oil Shipping Plug from the Oil Fill  
hole, located on the top of the crankcase cover  
at the rear of the air compressor.  
3. Slowly pour the oil into the Oil Fill hole, until the  
oil level rises to the center of the red dot on the  
Oil Sight Glass.  
Note: This compressor uses only SAE 5W-30  
motor oil.  
WARNING! Tank Drain Valve should always be  
opened slowly to avoid damage to equipment and  
possible injury.  
Air Filter: This heavy duty metal air filter keeps  
your compressor running cleanly, by filtering out  
impurities.  
Oil Breather Cap: As the compressor motor  
operates pressurized air must be released from the  
crank case. The oil breather cap allows built up air  
to escape, while shielding your air compressor from  
airborne impurities.  
Power Switch: The red tipped power switch turns the  
air compressor on and off. When switch is in horizontal  
position, compressor is turned ON. When switch is in  
vertical position, compressor is turned OFF.  
4. Install the Oil Breather Cap into the Oil Fill hole.  
Firmly hand tighten the Oil Breather Cap by  
turning clockwise.  
(See Figure 2)  
3
 
Oil  
Fill  
Crank-  
case  
Oil  
Sight  
Glass  
Figure 4. Installing the Air Filter  
Note: DO NOT over tighten Air Filter.  
Drain  
Plug  
Figure 2. Installing the Oil & Oil Breather Cap  
OPERATION  
BEFORE OPERATING YOUR NEW AIR  
COMPRESSOR please check the following points  
carefully:  
Installing the Air Chuck  
Note: The use of a sealant tape is recommended  
on the threads of the Air Chuck to prevent air  
leakage.  
1
Check that all nuts and bolts are secure.  
1. Thread the Air Chuck into the Air Regulator by  
turning the Air Chuck clockwise.  
2. Securely tighten the Air Chuck in place with a  
wrench.  
Note: DO NOT over tighten Air Chuck.  
(See Figure 3)  
2. Make sure oil has been properly added to  
compressor. (See Installing Oil and Oil Breather  
Cap section.)  
Initial Start-Up Procedure  
1. Open the Air Tank Drain Valve to permit air to  
escape, preventing air pressure buildup in the  
air tank.  
2. Run the compressor for a minimum of 20  
minutes in this “no-load” position to lubricate the  
piston and bearings.  
3. Close Air Tank Drain Valve. Your compressor is  
ready for use.  
Depending on the CFM draw of the tools being  
operated, your new Air Compressor can be used for  
operating paint sprayers, air tools, grease guns,  
airbrushes, caulking guns, abrasive blasters, tire &  
plastic toy inflation, spraying weed killer and  
insecticides, etc. Proper adjustment of the Air  
Pressure Regulator is necessary for all of these  
operations. Refer to the air pressure specifications  
provided with the tool you are using.  
Figure 3. Installing the Air Chuck  
Installing the Air Filter  
The metal Air Filter is installed into the threaded  
port of the cylinder head.  
General Overview  
To compress air, the piston moves 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 upstroke of the piston air is  
compressed. The inlet valve closes and air is forced  
out through the discharge valve, through the check  
valve, and into the air tank. Working air is not  
available until the compressor has raised the tank  
1. Thread the Air Filter into the Cylinder Head by  
turning the Air Filter clockwise.  
2. Securely tighten the Air Filter in place with a  
wrench.  
(See Figure 4)  
4
 
pressure above that required at the air service  
connection. The air inlet filter openings must be  
kept clear of obstructions, which could reduce air  
delivery of the compressor.  
To install an air hose, equipped with a 1/4" male  
coupler:  
1. Pull back on Air Chuck outer sleeve to allow  
coupler to be fully inserted into Air Chuck.  
2. Insert coupler into Air Chuck.  
3. Release outer sleeve of Air Chuck.  
4. Verify that air hose is securely connected to Air  
Chuck by pulling lightly on air hose.  
(See Figure 5)  
Installation and Location  
Locate the compressor in a clean, dry and well  
ventilated area. The compressor should be located  
12 to 18 inches from walls or any other obstruction  
which would interfere with airflow. Compressor  
should be located in a temperature controlled area  
between 32° and 95° fahrenheit. Place the  
compressor on a firm, level surface. The  
compressor is designed with heat dissipation fins  
which allow for proper cooling. Keep the fins (and  
all other parts which 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.  
Figure 5. Attaching an Air Hose  
Adjusting the Air Pressure  
Your Air Compressor is supplied with an Air  
Pressure Regulator. This Regulator adjusts the air  
pressure.  
Connecting to Power Source  
This air compressor is designed to operate on a  
properly grounded 120 volt, 60Hz, single phase,  
alternating current (ac) power source with a fused  
20 amp time delayed fuse or circuit breaker. It is  
recommended that a qualified electrician verify the  
ACTUAL VOLTAGE at the receptacle into which the  
unit will be plugged and confirm that the receptacle  
is properly fused and grounded. The use of the  
proper circuit size can eliminate nuisance circuit  
breaker tripping while operating your air  
To increase air pressure, turn Air Regulator  
clockwise.  
To decrease air pressure, turn Air Regulator  
counterclockwise.  
(See Figure 6)  
compressor.  
Extension Cords  
For optimum Air Compressor performance an  
extension cord should not be used unless  
absolutely necessary. If necessary, care must be  
taken in selecting an extension cord appropriate for  
use with your specific Air Compressor. Select a  
properly grounded extension cord which will mate  
directly with the power source receptacle and the  
Air Compressor power cord without the use of  
adapters. Make certain that the extension cord is  
properly wired and in good electrical condition.  
Maximum length of extension cord should be 50  
feet. Minimum wire size of extension cord should be  
12 gauge.  
Figure 6. Adjusting the Air Pressure  
Cold Weather Starting  
Temperatures below freezing (32°F) cause the  
metal parts of your Air Compressor to contract and  
that makes starting more difficult. To assist the Air  
Compressor in starting in cold weather, follow  
these tips:  
1. Try to keep Air Compressor stored in  
temperatures above 32° fahrenheit.  
2. Open the Air Tank Drain Valve and release all  
air pressure from the Air Tank before attempting  
to start in cold weather. (After air is released  
from Air Tank, close Drain Valve.)  
3. Plug Air Compressor directly into a 120 volt  
electrical outlet. Do not use an extension cord  
when starting your Air Compressor in cold  
weather.  
Attaching an Air Hose  
Your Air Compressor is supplied with a 1/4" Quick  
Disconnect Air Chuck. Once you have correctly  
installed the Air Chuck (See Installing the Air Chuck  
on p.4) your compressor will be ready to accept air  
hoses equipped with 1/4" male air couplers.  
Note: Use only air hoses rated for use with 115psi  
air pressure or higher.  
5
 
Changing the Air Compressor Oil  
Note: This compressor uses only SAE 5W-30  
motor oil.  
1. Remove the Drain Plug under the Oil Sight  
Glass by turning the nut counter-clockwise with  
wrench. (See Figure 2.)  
Note: Oil will begin to drain as Drain Plug is  
loosened. Place a funnel and oil pan in place  
BEFORE loosening Drain Plug.  
2. Once Drain Plug is removed, tilt Air Compressor  
backwards to allow all of the oil to drain out of  
the crankcase.  
3. Once oil is drained, replace Drain Plug and  
securely tighten in place with a wrench. B  
careful not to overtighten the Drain Plug, as this  
could damage the rubber seal.  
4. Place Air Compressor on level surface.  
5. Remove the Oil Breather Cap.  
6. Slowly pour the oil into the oil fill hole, until the  
oil level rises to the center of the red dot on the  
Oil Sight Glass.  
7. Install the Oil Breather Cap into the oil fill hole.  
8. Firmly hand tighten the Oil Breather Cap by  
turning clockwise.  
MAINTENANCE  
Daily (or before each use)  
1. Check oil level  
2. Drain condensation from the air tank.  
3. Check for any unusual noise or vibration.  
4. Be sure all nuts and bolts are tight.  
Weekly  
1. Clean breather hole on Oil Breather Cap.  
Monthly  
1. Inspect air system for leaks by applying soapy  
water to all joints. Tighten these joints if leaks  
are discovered.  
6 Months (or after 250 hours of operation -  
whichever comes first)  
1. Change Air Compressor Oil.  
Note: Change oil more often if Air Compressor is  
used near paint spraying operations or in dusty  
environments.  
Checking the Air Compressor Oil  
1. Place Air Compressor on level surface. The oil  
level should be at the red dot on the Oil Sight  
Glass.  
2. If oil level is low, remove Oil Breather Cap and  
add enough oil to bring the oil level to the red  
dot on the Oil Sight Glass.  
3. Replace Oil Breather Cap before starting  
compressor.  
Always inspect the tool before use, and make sure  
it is in good working condition. Make sure all air  
vents are clear, (use compressed air to clean the  
machine where possible). Check the power cable to  
make sure it is intact and free from cracks, bare  
wires etc. Avoid using solvents when cleaning  
plastic parts. Most plastics are susceptible to  
damage from the various types of commercial  
solvents.  
6
 
TROUBLESHOOTING  
TROUBLE  
POSSIBLE CAUSE  
CORRECTIVE ACTION  
Compressor Won't Start  
1. Blown Fuse or Circuit Breaker Tripped  
2. Loose Electrical Connections  
1. Replace or Reset Fuse/Circuit Breaker  
2. Check Wiring Connections  
Low Pressure  
1. Restricted Air Filter  
1. Replace Air Filter  
2. Defective Check Valve  
3. Air Leak in Safety Valve  
2. Replace Check Valve  
3. Check valve by pulling on ring. If  
condition persists, replace valve.  
Safety Valve Releasing  
Oil Discharge in Air  
1. Defective Pressure Switch  
1. Too much Oil in Crankcase  
1. Replace Pressure Switch  
1. Drain Crankcase and refill  
to proper level on Oil Sight Glass.  
2. Reduce air pressure regulation  
3. Clean or Replace Oil Breather Cap  
2. Compressor Overheated  
3. Restricted Oil Breather Cap  
7
 
Parts List and Diagram  
Part No.  
01  
02  
03  
04  
05  
06  
07  
08  
Description  
Plastic Housing  
Spring Washer  
Washer  
Screw M5x14  
Fan  
Screw M5x115  
Rear Cap  
Washer  
Part No.  
23  
24  
25  
26  
27  
28  
29  
30  
Description  
Drain Plug  
Pan Head Screw  
Oil Breather Cap  
Spring Washer 8  
Washer 8  
Screw M8x20  
Connecting Rod  
Piston  
Spring Washer 12  
Piston Pin  
Part No.  
46  
47  
48  
49  
50  
51  
52  
53  
Description  
Cylinder Head  
Elbow Exhaust  
Exhaust Pipe  
Check Valve  
Unload Pipe  
Air Tank  
Tank Drain Valve  
Rubber Feet  
Screw M6x20/nut M6  
Power Cord  
09  
10  
Bearing 6202  
Stator  
31  
32  
54  
55  
11  
12  
13  
14  
15  
16  
17  
18  
Rotor  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
Cylinder Gasket  
Cylinder  
Spring Washer 6  
Washer 6  
Screw M6x40  
Gasket  
Sealer Ring  
Valve Gasket  
Valve Plate Assy  
Air Intake Valve  
Limit Pin  
Cylinder gasket  
Metal Air Filter  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
Rubber Gasket  
Centrifugal Switch  
Seal Washer  
Nut  
Connector Seat  
Rubber Grip  
Safety Valve  
Pressure Gauge  
Pressure Switch  
Connector  
Starting Capacitor  
Running Capacitor  
Bearing 6204  
Oil Seal  
Nut M8  
Crankcase  
Crankshaft  
Screw M8x16 (left  
hand)  
Gasket  
Crankcase Cover  
Oil Sight Glass  
19  
20  
21  
22  
Pressure Gauge  
Regulator  
Air Chuck  
45  
68  
8
 
9
 
 

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