Northern Industrial Tools Air Compressor 2 HP 8 GALLON AIR COMPRESSOR User Manual

2 HP / 8 GALLON  
AIR COMPRESSOR  
OPERATING MANUAL  
Item # 123007  
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SAFETY RULES  
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.  
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.  
1. Know your machine. Read this manual carefully.  
Learn the machine’s applications and limitations,  
as well as specific potential hazards peculiar to it.  
2. Ground all machines. If the machine 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  
machinery 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.  
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.  
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.  
23. Read, understand and comply with all warning  
labels on unit.  
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 machine.  
Use ANSI approved safety glasses. Everyday  
eyeglasses only have impact resistant lenses.  
They 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  
machine. Please keep all apparel clear of the  
machine.  
12. Don’t overreach. Keep proper footing and balance  
at all times when operating this product.  
13. Always disconnect the machine from power  
source before making any adjustments, storing,  
servicing, or changing accessories. Such  
preventative safety measures reduce the risk of  
starting the tool accidentally.  
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 user 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.  
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.  
2
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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.  
KNOW YOUR COMPRESSOR  
Air Filter  
Handle  
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 Regulator  
Air  
Chuck  
Air Tank: Powder coated steel tank, with a 8 gallon  
capacity, stores the compressed air until it is needed.  
Pressure  
Gauges  
Air Tank  
GETTING STARTED  
Before operating your tool, check the contents of the  
box to make sure you have everything you will need.  
Tank Drain Valve  
Figure 1. Air Compressor  
Items included in the box:  
Air Compressor  
Air Filter  
Handle: Convenient handle allows for easy  
transport of your air compressor.  
Oil Breather Cap  
Bottle of Oil  
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.  
Wheels (2)  
Mounting Hardware for Wheels  
Owner’s Manual  
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.  
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  
pulled up, compressor is turned ON. When switch is  
pulled down, compressor is turned OFF.  
Installing the Wheels  
1. Locate the wheels, hex bolts, washers, and  
wheel nuts.  
2. Insert hex bolt through center hole in wheel rim.  
3. Insert the hex bolt, with wheel in place, through  
the hole located in the lower rear of the air  
compressor frame.  
4. Slide washer onto the end of bolt which you have  
just pushed through the air compressor frame.  
5. Securely tighten bolt in place with the wheel nut.  
6. Repeat steps 2 through 6 for remaining wheel.  
(See Figure 2)  
Note: Always make sure that compressor Power  
Switch is in the OFF position before  
performing any maintenance or plugging the  
compressor into a power supply.  
3
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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. 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 4)  
Figure 2. Installing the Wheels  
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.  
Figure 4. Installing the Air Chuck  
Installing the Air Filter  
The metal Air Filter is installed into the threaded  
port of the cylinder head.  
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.  
4. Install the Oil Breather Cap into the Oil Fill hole.  
Firmly hand tighten the Oil Breather Cap by  
turning clockwise.  
(See Figure 5)  
(See Figure 3)  
Oil  
Fill  
Crank-  
case  
Figure 5. Installing the Air Filter  
Note: DO NOT over tighten Air Filter.  
Figure 3. Installing the Oil & Oil Breather Cap  
4
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Connecting to Power Source  
OPERATION  
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  
BEFORE OPERATING YOUR NEW AIR  
COMPRESSOR please check the following points  
carefully:  
1
Check that all nuts and bolts are secure.  
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.  
compressor.  
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.  
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.  
General Overview  
Attaching an Air Hose  
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  
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.  
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.  
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 6)  
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 loacted in a temperature controlled area  
between 32º and 95º fahrenhert. 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 6. Attaching an Air Hose  
5
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Adjusting the Air Pressure  
Your Air Compressor is supplied with an Air  
Pressure Regulator. This Regulator adjusts the air  
pressure.  
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.  
To increase air pressure, turn Air Regulator  
clockwise.  
To decrease air pressure, turn Air Regulator  
counterclockwise.  
(See Figure 7)  
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.  
Changing the Air Compressor Oil  
Note: This compressor uses only SAE 5W-30  
motor oil.  
1. Remove the Oil Sight Glass by turning counter-  
clockwise with wrench.  
Figure 7. Adjusting the Air Pressure  
Note: Oil will begin to drain as Oil Sight Glass is  
loosened. Place a funnel and oil pan in place  
BEFORE loosening Oil Sight Glass.  
2. Once Oil Sight Glass is removed, tilt Air  
Compressor backwards to allow all of the oil to  
drain out of the crankcase.  
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:  
3. Once oil is drained, replace Oil Sight Glass and  
securely tighten in place with a wrench. Be  
careful not to overtighten the Oil Sight Glass, 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.  
Firmly hand tighten the Oil Breather Cap by  
turning clockwise.  
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  
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.  
MAINTENANCE  
Daily (or before each use)  
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.  
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
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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
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Parts List and Diagram  
Part No.  
Description  
Qty  
Part No.  
Description  
Qty  
1
2
3
4
5
6
7
8
Air Tank  
Nut/M8  
Spring Washer  
Washer  
Axel Bush  
1
9
7
7
2
2
2
1
1
1
4
1
1
1
1
1
4
1
1
1
2
1
2
2
2
1
1
6
1
1
1
1
1
1
1
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
Oil Sight Glass  
Pan Head Screw/M5 16  
Handle  
Cylinder Gasket  
Connecting Rod  
Piston  
Cylinder Gasket  
Cylinder Gasket  
Cylinder  
1
6
1
1
1
1
1
2
1
1
1
4
1
1
1
1
1
2
1
1
2
1
1
1
1
1
1
1
1
4
1
Wheel  
Axel Bolt  
Exhaust Pipe  
Connecting Pipe  
Nut  
Spring Washer  
Plastic Housing  
Fan  
Rear Cap  
Washer  
Bearing  
Screw  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
Gasket  
Elbow Exhaust  
Screw M8X105  
Metal Air Filter  
Connector  
Cylinder Head  
Valve Gasket  
Valve Plate Assy  
Limit Pin  
Air Intake Valve  
Piston Pin  
Spring Washer  
Pressure Gauge  
Connector  
Stator  
Rotor  
Starting Capacitor  
Washer  
Centrifugal Switch  
Screw/M4 14  
Nut /M4  
Screw /M5 12  
Current Protector  
Running Capacitor  
Screw /M5 12  
Bearing  
Nut  
Pressure Switch  
Safety Valve  
Regulator  
Air Chuck  
Pressure Gauge  
Screw /M8X30  
Unload Pipe  
Check Valve  
Power Cord  
Tank Drain Valve  
Rubber Feet  
Washer  
Oil Seal  
Screw /M12 12  
Capacitor Stand  
Crankcase  
Crankshaft  
Screw M8 16  
Gasket  
1
1
1
1
1
Oil Breather Cap  
Crankcase Cover  
1
1
Screw/M8X25  
8
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9
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