1
M47500A.2
ITEM NUMBER: 47500 & 47501
SERIAL NUMBER: _____________
Owner’s Manual
Electric Stationary Air Compressor
(230V, single phase/60 gallon, 3 HP and 5 HP)
Instructions for Installation/Set-up, Operation, Maintenance, & Storage
This NorthStar® belt-driven compressor has a single-stage 2-cylinder pump (Model 47500) or single-stage 3-cylinder
pump (Model 47501), made with heavy-duty cast iron cylinders for long life, and a compact design rated for 135
maximum PSI. Its continuous-duty rating ensures long-lasting performance, and its cast iron pump head ensures
superior heat dissipation.
Read and understand this Owner’s Manual completely before using. Keep this manual for future review. Failure to
properly set up, operate and maintain the compressor in accordance with this manual could result in serious injury or
death to operator or bystanders.
WARNING: SPECIAL HAZARDS
Injection Injury: High-pressure air stream can pierce skin and underlying tissues, leading to serious injury and possible
amputation. Such an injection injury can result in blood poisoning and/or severe tissue damage.
Flying Debris: High-pressure air stream can cause flying debris and possible surface damage.
Not For Breathing Air: NorthStar compressors are NOT designed, intended, or approved for supplying breathing air. No
compressed air should be used for breathing unless air is treated in accordance with applicable standards.
Fire/Explosion: Sparks from air powered tool heads or attachments can ignite fuel or other flammable liquids or vapors in
the vicinity. Exceeding the maximum pressure for air tools or attachments could cause them to explode.
Burns: Compressor pump, motor and discharge tubing are hot surfaces that can cause burn injuries.
Electric Shock: Operating equipment in wet conditions or where not properly grounded can cause electric shock.
Detailed safety information about these hazards appears throughout this manual.
Equipment Protection Quick Facts
Inspect Upon Delivery: FIRST! Inspect for missing or damaged components. See “Initial Set-Up” section for where
to report missing or damaged parts.
Check Pump Oil: Pump is shipped with oil. Check the pump oil level before starting. See “Preparing for Operation”
section of this Owner’s Manual for capacity and viscosity.
Use Mechanical Lifting Equipment: Compressor is shipped on a pallet and is too heavy to handle manually. Use
proper lifting equipment for unloading and moving to installation site.
Install Using a Qualified Electrician: All wiring, grounding, and electrical connections must be made by a qualified
electrician. Install according to local and national codes.
Install a Regulator: We recommend installing a regulator on the compressor at each distribution point to maintain
constant pressure in the outlet hose line and provide reduced pressure appropriate for air tool being used.
Run Pump Unloaded for Break-in Period: Before initial use, open ball valve and run compressor for 30 minutes to
break in pump parts.
Follow Maintenance Schedule: Pump, air filter, and tank require periodic inspection and servicing to provide
efficient function and long life. See “Maintenance Schedule” for frequency of servicing.
2
Table of Contents
Equipment Protection Quick Facts ........................................................................................................................................ 1
Table of Contents ........................................................................................................................................................ 2
About Your Air Compressor ....................................................................................................................................... 4
Specifications .............................................................................................................................................................. 5
Component Identification ........................................................................................................................................... 6
Safety Signal Words .................................................................................................................................................... 7
Hazard Signal Word Definitions ............................................................................................................................................ 7
Safety Labeling ............................................................................................................................................................ 8
Safety Decal Locations ......................................................................................................................................................... 8
Safety Decals ........................................................................................................................................................................ 9
Initial Set-Up .............................................................................................................................................................. 10
Step 1. Inspect & Unpack ...................................................................................................................................................... 10
Step 2. Assembly ................................................................................................................................................................... 10
Attach Air Filter.................................................................................................................................................................... 10
Attach Regulator (Recommended) ...................................................................................................................................... 10
Step 3. Select Suitable Location ........................................................................................................................................... 11
Step 4. Permanent Mounting ................................................................................................................................................ 11
Step 5. Installing Distribution Piping ................................................................................................................................... 12
Step 6. Wiring Installation ..................................................................................................................................................... 12
Electric Compatibility ........................................................................................................................................................... 12
Wire Size ............................................................................................................................................................................. 12
Circuit Breaker .................................................................................................................................................................... 13
Pressure Switch Wiring ....................................................................................................................................................... 13
............................................................................................................................................................................................ 13
Grounding ........................................................................................................................................................................... 13
Model #47500 and #47501 (230 Volt; 3 / 5 HP) .................................................................................................................. 14
*Circuit Breaker ................................................................................................................................................................... 14
**Wire Size .......................................................................................................................................................................... 14
*Voltage .............................................................................................................................................................................. 14
*Circuit Breaker ................................................................................................................................................................... 15
**Wire Size .......................................................................................................................................................................... 15
*Voltage .............................................................................................................................................................................. 15
Operation ................................................................................................................................................................... 16
Follow Operation Safety Rules ............................................................................................................................................. 16
Prepare for Operation ............................................................................................................................................................ 16
Check/Add Oil to the Pump ................................................................................................................................................. 16
Proper Air Hose and Tool Use .............................................................................................................................................. 17
Pressure Control Related Devices ...................................................................................................................................... 17
Compressor - Tool Requirements ....................................................................................................................................... 17
Attaching/Disconnecting Air Hose and Tools ...................................................................................................................... 17
Using Compressor for Spraying ........................................................................................................................................... 18
Flammable Materials ........................................................................................................................................................... 18
Moisture in Compressed Air ................................................................................................................................................ 18
Shutdown ............................................................................................................................................................................... 18
Procedure ........................................................................................................................................................................... 18
For Malfunction During Operation ....................................................................................................................................... 18
Maintenance & Repair ............................................................................................................................................... 19
3
Maintenance Schedule Summary ............................................................................................................................. 19
Detailed Instructions – Maintenance & Repair ........................................................................................................ 19
Inspect Safety/Relief Valve ................................................................................................................................................. 19
Inspect Air Filter .................................................................................................................................................................. 19
Keep Compressor Clean ..................................................................................................................................................... 19
Inspect Compressor for Air Leaks ....................................................................................................................................... 20
Change Pump Oil ................................................................................................................................................................ 20
Drain Receiver Tank and Inspect Tank ............................................................................................................................... 20
Check Drive Belt for Tension and Alignment....................................................................................................................... 20
Keep Compressor Clean ..................................................................................................................................................... 21
Troubleshooting ........................................................................................................................................................ 22
Parts List – Model 47500 Rev A.2 ............................................................................................................................. 23
Parts List – Model 47500 Rev A.2 ............................................................................................................................. 24
792363 Pump Exploded View ................................................................................................................................... 25
792363 Pump Parts List ............................................................................................................................................ 26
792363 Pump Kit List ................................................................................................................................................ 27
Parts List – Model 47501 Rev A.2 ............................................................................................................................. 28
Parts List – Model 47501 Rev A.2 ............................................................................................................................. 29
792373 Pump Parts List ............................................................................................................................................ 30
792373 Pump Parts List ............................................................................................................................................ 31
792373 Pump Parts List ............................................................................................................................................ 32
Appendix A: Lubricants and Compatibility ............................................................................................................. 33
Alternate Lubricants ............................................................................................................................................................ 33
Limited Warranty ....................................................................................................................................................... 34
4
About Your Air Compressor
Thank you for purchasing a NorthStar air compressor! It
is designed for long life, dependability, and top
performance.
Intended Use. Provides compressed air used primarily
for operating air tools and pressurizing other objects
that require high air pressure, such as tires. Do not
use for low-pressure objects such as balloons, air
mattresses, and sport balls, which can explode
quickly and easily. Special precautions are
necessary when used for cleaning to prevent flying
debris hazards. It is not to be used to supply
breathing air.
Supplies Required. Normal operation will require you
to supply:
Pressure regulator (recommended)
Pump oil
Personal protection equipment
See “Specifications” section for more detail.
Site Location. Install in enclosed building only. See
“Select Suitable Location” on page 11 for more
information.
Personal Protection. Wear safety apparel during
operation, including safety glasses with side and top
protection.
Adult Control Only. Only trained adults should set up
and operate the air compressor. Do not let children
operate.
Under The Influence. Never operate, or let anyone else
operate, the air compressor while fatigued or under
the influence of alcohol, drugs, or medication.
Keep this manual for reference and review.
ATTENTION: Rental Companies and Private
Owners who loan this equipment to others!
All persons to whom you rent/loan this air compressor
must have access to and read this Owner’s Manual.
Keep this manual with the air compressor at all times
and advise all persons who will operate the machine to
read it. You must also provide personal instruction on
how to safely set-up and operate the air compressor
and remain available to answer any questions a
renter/borrower might have. Owner’s Manuals are
available from NorthStar at 1-800-270-0810.
For any questions, comments, problems or part orders,
call NorthStar at 1-800-270-0810.
5
Specifications
MODEL
Model #
47500
47501
FLOW OUTPUT
Max. Pressure Rating
135 PSI
135 PSI
Volume Rating @ 90PSI
11.3 CFM
15.5 CFM
Receiver Capacity
60 gal.
60 gal.
Power Requirements
Dedicated NEMA
Receptacles
6-30R
6-30R
Volts
230V
230V
Amps
20A
30A
Motor
Horsepower
3 HP
5 HP
DIMENSIONS / COMPONENTS
Length
24.25”
24.25”
Width
23”
23”
Height
71”
63”
Weight
251 lbs.
340 lbs.
Mounting Hole Diameter
.56”
.56”
Suggested Mount Bolt
Diameter
7/16”
7/16”
SUPPLIES REQUIRED (not included)
Pump Oil
(shipped with oil, but refills
required)
SAE 30 non-detergent pump oil
(#4043)
SAE 30 non-detergent pump oil
(#4043)
Pump Oil Capacity
15.6 oz.
23.7 oz.
6
Component Identification
1. Lifting Eyes: May also be used as tie down locations.
2. Pressure Gauge: Air filled gauge. Shows pressure in
receiver tank.
3. Ball Valve: On/Off control for pressurized air supply from
receiver tank (not the output pressure). A regulator and/or
quick connect fittings can attach to its ½” NPT outlet. A
regulator should be installed for pressure regulation
purposes.
4. Air Receiver / Storage Tank: 80 gallon ASME certified
tank.
5. Tank Drain Valve: Used to remove moisture from air after
compressor is shut off and air emptied from tank. Drain
moisture daily after each use.
6. ASME Safety/Check Valve: Automatically releases air if
tank exceeds preset pressure max. of 200 PSI. A check
valve is a pressure release port. Pull valve pin to relieve
pressure from receiver tank.
7. Pressure Switch-Auto/Off switch: In AUTO
position, compressor shuts off automatically when
tank pressure reaches maximum preset pressure
(approximately 135 PSI). In OFF position, compressor
will not operate. Switch should be in OFF position
when connecting or disconnecting power cord from
electrical outlet. NEVER attempt to adjust this
pressure switch.
8. Discharge Tube: Carries compressed air from pump to
safety/check valve, and then to the storage tank. It
becomes very hot during use and can cause severe burns.
Never touch.
9. Unloader: Vents discharge air to atmosphere in start/stop
operation.
10. Magnetic Oil Drain Plug: Removal allows for drainage of
oil from pump. Attracts metal particles that could damage
pump.
11. Air Compressor Pump: Shipped with oil.
12. Compressor Air Filter: Keep clean and particle free. See
“Pump Explosion and Pump Parts List” for replacement
part number.
13. Belt Guard: Covers belt, engine pulley and flywheel.
NEVER operate compressor without belt guard in place.
3
1 2 4
8
9
5
6
7
11
13
10
12
7
Safety Signal Words
DANGER
WARNING
CAUTION
CAUTION
NOTICE
Hazard Signal Word Definitions
This is the safety alert symbol. It is used to alert you to
potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible injury
or death.
DANGER (red) indicates a hazardous situation, which if
not avoided, will result in death or serious injury.
WARNING (orange) indicates a hazardous situation,
which if not avoided, could result in death or serious
injury.
CAUTION (yellow), used with the safety alert symbol,
indicates a hazardous situation, which if not avoided,
could result in minor or moderate injury.
CAUTION (yellow), without the safety alert symbol, is
used to address practices not related to personal injury.
NOTICE is used to address practices not related to
personal injury.
8
Safety Labeling
On-Product Warning Labels
Location
Part numbers
Description
1
792161
Air Compressor Instructions
2
792174
Breathing Hazard
3
792175
Belt Hazard
4
792176
Burn Hazard
5
792177
Corrosion Hazard
6
789060
Electrical Shock Hazard
1
2 3 6
5
4
Safety Decal Locations
WARNING:
ALWAYS make sure safety labels are in place and in good condition. If a safety label is missing or not legible, order new labels
from NorthStar Product Support at 1-800-270-0810.
9
Safety Decals
1
2
6
3
4
5
To order replacement safety labels, call NorthStar Product Support
at 1-800-270-0810.
10
Initial Set-Up
Plastic plug
Base
Air Filter
Housing
Washer
Wing Nut
Grip here
to tighten
Step 1. Inspect & Unpack
Upon receipt, inspect air compressor for missing or
damaged parts. Verify that it is the compressor you
ordered.
See “Component Identification” section of this manual
for a diagram of the compressor and its components.
For missing or damaged components, please
contact NorthStar Product Support at 1-800-270-
0810.
If complete, fill out product serial number
information. See “Limited Warranty” section of
this manual.
Step 2. Assembly
Attach Air Filter
1. Remove air filter from manual bag.
2. Remove plastic plug from air compressor inlet.
(Figure 1)
Figure 3
Figure 4
5. Replace air filter housing and washer. Secure
with wing nut, hand tighten only. (Figure 5)
Figure 1
3. Unscrew wing nut, remove washer and air filter
housing from base. (Figure 2)
Figure 2
4. Screw base into air compressor inlet as shown.
Tighten with appropriate tool on specified
location. (Figure 3 & Figure 4)
Figure 5
Attach Regulator (Recommended)
We recommend using a regulator with this compressor
since the pre-set tank pressure ranges between 105 and
135 PSI and is usually greater than what is needed by
tools.
Without the addition of a regulator, the pressure switch
will maintain a tank pressure within the pre-set range
that has a max of 135 PSI. This is considered an overly
high pressure for many tools. A user-installed regulator
can maintain a lower constant pressure in the outlet
hose line and prevent over pressurization of tools.
WARNING: Bursting hazard
Too much air pressure causes a hazardous risk of
bursting. Check the manufacturer’s maximum pressure
rating for air tools and accessories. Regulators must
never be set to exceed the maximum pressure rating of
tank or tools.
11
Step 3. Select Suitable Location
WARNING: Lifting hazard
The compressor is heavy. Ensure that proper lifting
equipment is available to unload and move compressor
to installation site.
Location Criteria:
Enclosed building only.
Where no flammable vapors, dusts, and gases
are present.
At least 15” away from walls and other objects.
Away from other heat-generating equipment.
Away from dusty/dirty conditions.
In a well illuminated area.
Where proper wire size is already, or can be
made, available.
Positioning:
The compressor should be mounted on a dry,
firm, and level surface. It must sit level and be
stabilized since it will slide or shift during
operation if not secured.
Airflow:
Provide access to adequate, clean and
unobstructed airflow for cooling and air supply.
Remember the supply air is passing through the
compressor supply hoses and tools. These can
be damaged or have a shortened life if unclean
air is present or air filter is not clean and
functioning properly.
Do not allow debris to accumulate or block
airflow.
Do not operate with a tarp, blanket, or cover
surrounding the machine, which blocks air flow.
Do not place any objects against or on top of the
unit, which can also block airflow or damage unit.
Electrical:
MUST be connected to a 230 Volt, single-phase
outlet having operating capacity of 20 amp (Model
#47500, 3 HP) or 30 amp (Model #47501, 5 HP).
Wiring:
Proper wire size should take into consideration
length from distribution panel.
See Step 6, “Wiring Installation” for more
information.
Ideal operating temperatures:
40 and 100F (4 and 37C).
Operating Limitations:
15F (-9C) or above 125F (52C).
If temperatures consistently drop below 32 F (0C),
install within an enclosed heated building. If this is not
possible, protect the safety/relief and drain valves from
freezing.
Note: Excessive moisture is likely to occur if unit is
stored in an unheated area subject to large
temperature changes. Moisture forming in pump can
produce sludge in the oil, causing parts to wear out
prematurely. Excessive condensation on the pump
when it cools down is a sign that this may be
occurring.
Step 4. Permanent Mounting
You will permanently mount the compressor after
selecting the location in Step 3.
1. On a concrete pad or other stable mounting
platform, drill 3 holes according to the mounting
dimensions given in the diagram below. (Figure 6)
Figure 6
2. Unbolt the compressor feet by removing the
fasteners. Discard them after removal. (Figure
7)
Figure 7
3. Lift and remove the compressor from the pallet
using a hoist and lifting eyes provided.
4. Situate unit in chosen location and bolt in place.
(Use 7/16” bolts and washers. Make sure bolts
are long enough to provide a good anchor
point.) Bolt it in place to prevent unit from
12
vibrating excessively. Use metal shims under
the “short” feet if necessary.
5. A rubber isolation mat or pads may be used
under each mounting foot to reduce vibration.
Step 5. Installing Distribution Piping
The stationary compressor can utilize the same type of
properly rated, single flexible hose, as is used on
portable air compressors. However, many purchasers
will prefer to utilize the stationary unit through a
permanently installed distribution system serving several
points within a facility. The design, installation and
usage of stationary compressed air distribution systems
has been the subject of extensive industrial, trade and
government attention, as can be seen within many
private and government websites.
An example of the typical components used in a
permanent distribution system are shown in Figure 8.
regulating the distribution line pressure at the
compressor outlet to under 150 PSI (usually in the 90120 PSI range) is mandatory for many compressed air
piping systems.
NorthStar recommends that you contact plumbers or
mechanical contractors with expertise in compressed air
systems to plan and/or install your distribution system.
WARNING: Bursting hazard
This unit can produce pressures in excess of 135 PSI,
which is beyond the capabilities of many piping types
and pipe fittings. Failure of undersized and/or
inadequate distribution components can lead to serious
injury.
WARNING: Restriction hazard
If an aftercooler, check valve, block valve, or any other
restriction is added to the compressor discharge, install
a properly sized ASME approved pressure safety/relief
valve between the compressor discharge and the
restriction.
Step 6. Wiring Installation
Wiring should be installed by a qualified electrician.
Installations must be in accordance with all applicable
local, state, and federal regulations.
WARNING: Electrical Shock Hazard
Improper electrical grounding can result in a risk of
electric shock. Electrical installation and service of the
230V, single-phase box (30 or 40 amp) MUST be made
by a qualified electrician. If the compressor must be
reinstalled at a different location, the re-connection
should also be made by qualified personnel. The
compressor motor may not start or may burn out
prematurely if adequate amperage is not available.
Figure 8
It should be obvious that there is considerable
complexity in designing and installing such a system.
Controlling the pressures, moisture in the air, drying
components, contaminants, lubrication, as well as
choosing and sizing the piping for the system, requires
the expertise of persons or firms familiar with such
designs and their installation.
A very significant safety issue arises when one is
distributing line pressure air throughout a facility, which
is over 150 PSI. Standard components, steel pipe
fittings and many plastic compressed air piping systems
are only rated to 150 PSI and cannot be safely used in
such distribution systems. In such cases, immediately
Electric Compatibility
The motor rating, as shown on the motor nameplate,
and the building power supply must have compatible
voltage, phase and hertz characteristics.
Wire Size
The electrical wiring required between the building’s
power supply and the electric motor varies according to
motor horsepower. Power leads must be adequately
sized to protect against excessive voltage drop during
start-up. High voltage drops can cause motor to
overheat and fail. A qualified electrician should provide
information for selecting proper wire size. If other
electrical equipment is connected to the same circuit,
the total electrical load must be considered in selecting
the proper wire size. DO NOT use undersized wire.
13
CAUTION: Inadequate wiring hazard
Connect ground wire
from power source here
Connect 230V wires from
Wires from motor
Overheating, short-circuiting and fire damage will result
from inadequate wire sizing.
Circuit Breaker
Your electrician will need to refer to the National Electric
Code to determine the proper circuit breaker rating
required. When selecting a circuit breaker, remember
the momentary starting current of an electric motor is
greater than its full load current. Time-delay or “slowblow” circuit breakers are recommended.
Pressure Switch Wiring
See below image for proper pressure switch wiring. See
figures 9 and 10 for detailed wiring schematic.
power source here
Grounding
This product and its associated conduit and junction box
must be grounded. Do not ground to a gas supply line.
WARNING: Electrical shock hazard
Improperly grounded motors are shock hazards. Make
sure all equipment is properly grounded. Check with a
qualified electrician if you are in doubt as to whether the
outlet is properly grounded.
14
Model #47500 and #47501 (230 Volt; 3 / 5 HP)
*Circuit Breaker
You will recognize this unit since it has a motor reset
button. The power lines should be connected directly to
the pressure switch (Figure 9 and 10).
Your electrician will need to refer to the National Electric Code to determine the proper circuit breaker rating required. When
selecting a circuit breaker, remember the momentary starting current of an electric motor is greater than its full load current. Timedelay or “slow-blow” circuit breakers are recommended.
**Wire Size
The electrical wiring required between the building’s power supply and the electric motor varies according to motor horsepower.
Power leads must be adequately sized to protect against excessive voltage drop during start-up. High voltage drops can cause
motor to overheat and fail. A qualified electrician should provide information for selecting proper wire size. If other electrical
equipment is connected to the same circuit, the total electrical load must be considered in selecting the proper wire size. DO NOT
use undersized wire.
*Voltage
MUST be connected to a 230 Volt, single-phase outlet having operating capacity of 20 amp (Model #47500, 3 HP) or 30 amp
Model 47500 View - Pressure Switch
Figure 9
15
*Circuit Breaker
Model 47501 View - Pressure Switch
Your electrician will need to refer to the National Electric Code to determine the proper circuit breaker rating required. When
selecting a circuit breaker, remember the momentary starting current of an electric motor is greater than its full load current. Timedelay or “slow-blow” circuit breakers are recommended.
**Wire Size
The electrical wiring required between the building’s power supply and the electric motor varies according to motor horsepower.
Power leads must be adequately sized to protect against excessive voltage drop during start-up. High voltage drops can cause
motor to overheat and fail. A qualified electrician should provide information for selecting proper wire size. If other electrical
equipment is connected to the same circuit, the total electrical load must be considered in selecting the proper wire size. DO NOT
use undersized wire.
*Voltage
MUST be connected to a 230 Volt, single-phase outlet having operating capacity of 20 amp (Model #47500, 3 HP) or 30 amp
Figure 10
16
Operation
Oil Cap
Sight
Glass
Drain Plug
Breather Cap
Magnetic
Drain Plug
Follow Operation Safety Rules
Before starting the compressor, review the safety rules
found below and throughout the manual.
WARNING
Failure to follow safety rules may result in serious injury
or death to the operator or bystanders.
Instruct Operators. Owner must instruct all operators in
safe set-up and operation. Do not allow anyone to
operate the compressor who has not read the
Owner’s Manual.
Safety Guarding. Only operate with safety covers,
guards and barriers secured and in good working
order.
Moving Parts. Keep hands, feet, hair and apparel away
from moving parts. Never remove any guards while
the unit is operating. Do not reach into an air vent or
cavity, as they may cover dangerous moving parts.
Ear Protection. Hearing can be damaged from
prolonged, close-range exposure to the noise level
produced by this compressor. Ear plugs or other
hearing protection is recommended for persons
working who are exposed within 15-20 feet of the
running compressor for an extended period of time.
Eye Protection. Wear ANSI/OSHA required “Z87.1”
safety glasses when operating or servicing the
compressor. Pressurized air spray from this unit can
cause severe injury to the eyes. Also, small objects
will become airborne as the air spray contacts them.
Respirator. Wear a respirator when using the
compressed air for spraying. Spray in a well ventilated area to prevent health and fire hazards.
Prepare for Operation
Make sure that any regular maintenance has been
performed as prescribed in “Maintenance & Repair”
section.
Drain receiver tank of any moisture.
Inspect for oil leaks.
Check for any unusual noise/vibration.
Ensure the area around compressor is free from
rags, tools, debris and flammable or explosive
materials.
Ensure belt guards and covers are securely in
place.
WARNING: Entanglement hazard
Do NOT operate with protective covers or guards
removed. Beneath these covers are high speed moving
components, which can entangle the operator or
bystanders. Entanglement in this equipment may result
in serious injury, amputation or death.
Check/Add Oil to the Pump
Check the oil level in the pump. Use sight glass for
pump oil level. Add oil as needed.
Engine: See engine Owner’s Manual for capacity and
recommended oil type for your expected ambient
conditions.
WARNING: Burn hazard
Never open oil port while compressor is running. Hot oil
can spray over face and body.
CAUTION: Inadequate lubrication hazard
Never operate compressor with inadequate lubricant.
This will cause overheating and severe damage to the
engine and pump.
Figure 11
47500 Model Pump: The compressor pump capacity is
15.6 oz. Use SAE 30 non-detergent pump oil prior to
break-in. You may use synthetic lubricants after 50 hour
break-in. See “Lubricants and Compatibility” for a list of
suitable and alternative lubricants.
17
Figure 12
Magnetic Drain Plug
Drain Plug
Oil Cap
Breather Cap
Sight Glass
On
Off
47501 Model Pump: The compressor pump capacity is
23.7 oz. Use SAE 30 non-detergent pump oil prior to
break-in. You may use synthetic lubricants after 50 hour
break-in. See “Appendix A: Lubricants and
Compatibility” for a list of suitable and alternative
lubricants.
CAUTION: Synthetic lubrication damage
If you will be using a synthetic lubricant, all downstream
piping material and system components must be
compatible.
Start-Up Procedures
CAUTION: Break-in period
Before initial use, open the ball valve and run the
compressor without air tools attached and through open
air line for 30 minutes to break-in pump parts.
1. Verify that the pressure switch is in the OFF
position. (Figure 13)
2. Turn regulator counter clockwise to close, if installed.
3. Verify that the pressure gauge reads zero.
4. Open the ball valve so that air flow is permitted.
5. Turn the pressure switch to the AUTO position.
6. Adjust regulator to desired pressure, if installed.
7. Allow pressure in receiver tank to build.
Note: This electric model is equipped with a pressure
switch that automatically turns the motor off when the
tank pressure reaches its preset level. Once air
Figure 13
pressure in the tank drops to a preset low level, the
pressure switch automatically turns the motor back on.
WARNING: Overheating
This compressor is equipped with “auto shut off”.
However, failure to allow adequate cooling ventilation or
a restriction in the intake airflow may cause the
machine to overheat.
WARNING: Inflatables/Low PSI tire
Never use compressor to inflate small low-pressure
objects, i.e., balloons/inflatables, small or low volume
PSI tires. It is easy to over-pressurize them, causing
them to rupture. Identify the inflation capacity of an
object prior to filling it with air. Use a gauge to check the
pressure regularly when inflating anything.
Proper Air Hose and Tool Use
Pressure Control Related Devices
Never remove, adjust, bypass, change, modify or make
substitutions for safety/relief valves, pressure switches
or other pressure control related devices. Pressurizing
beyond the limits of the compressor could result in an
explosion.
WARNING: Overpressurization hazard
NEVER over-pressurize the receiver tank or air tools
beyond nameplate capacity. Exceeding the pressure
rating could cause them to explode or fly apart.
Compressor - Tool Requirements
Compressor and attachments must be sized properly
for pressure and air volume.
Consider the maximum pressure requirements and
air volume requirements of each. (The volume rating
of your compressor is listed in the “Specifications”
section.)
CAUTION: Tool overpressure hazard
Do not operate this unit with any tool rated less than the
maximum operating pressure of the unit (135 PSI)
unless a properly sized regulator limiting pressure is
used before the tool.
Attaching/Disconnecting Air Hose and Tools
CAUTION: High pressure stream hazard
High-pressure air stream can pierce skin and underlying
tissues, leading to serious injury and possible
amputation. Such an injection injury can result in blood
poisoning and/or severe tissue damage. High-pressure
air stream can also cause flying debris and possible
surface damage.
On a fixed line distribution system the flexible hosing
and tools would typically be connected at a terminating
point. In some cases where a fixed system does not
exist, the flexible hosing can be attached to the quick
18
connect fitting on the main compressor outlet or after the
Collar
Coupler
Quick Disconnect
Socket
Correct
Insertion
Not Fully
Inserted
Collar Seated
Collar NOT Seated
Tool
user installed regulator.
CAUTION: Air tools hazard
Do not attach air tools to open end of the hose until
start-up is completed and the unit checks out OK.
Quick Connect Procedure:
Keep finger off tool or activation switch until ready
to use.
Pull quick connect collar back (Figure 14a).
Push hose or attachment firmly against stop.
Let go of collar (Figure 14a).
Pull and rotate slightly (hose or attachment) to
assure a tight connection.
WARNING: Projectile hazard
Air tool or attachment can become a projectile and
cause serious personal injury or damage if not securely
attached to the air hose.
Figure 14a
the tank. Part of the moisture will be discharged in the
outlet air.
When using a paint spray or sandblast gun, this water
will be carried from the tank through the hose, and out of
the gun as droplets mixed with the spray material. If this
is not acceptable for your application, an external air
dryer must be added to the system.
Shutdown
Procedure
When you are finished using the compressor:
1. Move the pressure switch to the OFF position.
2. Close the ball valve to stop airflow.
3. Unplug the power cord.
4. Operate tools briefly to release live pressure
5. Disconnect all tools.
6. Drain air receiver tank by pulling safety relief
valve.
7. After all storage air is discharges, disconnect
hoses and open the ball valve.
8. Once the tank pressure gauge registers under 10
PSI, open the drain valve on the bottom of the
tank to drain condensation moisture.
WARNING: Risk of bursting
Drain air receiver tank daily or after each use to prevent
moisture buildup in the air tank. Serious injury or death
may occur from a tank explosion caused by moisture
induced tank corrosion.
Figure 14b Figure 14c
Using Compressor for Spraying
Flammable Materials
Always follow precautions on container labels or MSDS’
before spraying flammable materials, such as paint.
Moisture in Compressed Air
Moisture in supply air when compressed will form into
droplets as it leaves air compressor pump and enters
receiver tank. When humidity is high or when a
compressor is in continuous use for an extended period
of time, a significant amount of moisture will collect in
For Malfunction During Operation
Immediately turn off the compressor if any of the
following conditions arise during operation:
Excessive change in motor speed, slow or fast
Overheating
Excessive vibration
Unusual noise
Flame or smoke
Air leakage
Pull ring on safety valve to immediately relieve pressure.
WARNING: Shutdown hazards
Do not leave an operating machine unattended. Always
shut the machine OFF and relieve the pressure before
leaving the machine. NEVER disconnect the highpressure outlet hose from the unit while the tank and air
line are pressurized. A hazardous high pressure air
stream will result as receiver tank is quickly emptied.
19
Maintenance & Repair
Item
Frequency
Inspect safety/relief valves
Weekly
Check pump oil level
Weekly
Inspect air filter
Weekly
Replace every 12 months or 1000 hours of
use
Inspect for air leaks
Monthly
Change pump oil/ Clean magnetic drain plug
After first 50 hours of use
Every 3 months or 500 hours of use
Inspect & drain receiver tank
Daily
Check drive belt tension and alignment
Monthly
Dust/debris removal
Monthly
WARNING: Maintenance hazards
ALWAYS disconnect, lock out and tag the main power supply and then release air pressure from the receiver tank before
cleaning, adjusting, or servicing the compressor. Make sure all guards and shields are replaced before re-starting.
Maintenance Schedule Summary
See detailed instructions for each maintenance item below.
Detailed Instructions – Maintenance & Repair
NOTICE
Dispose of used motor and pump oil in a manner that is
compatible with the environment and in accordance
with local, state, and federal laws and regulations.
Take used oil in a sealed container to your local
recycling center or service station for reclamation.
Do not throw it in the trash, pour it on the ground, or
No Modifications. Never modify or alter the
compressor in any way. Modifications can create
serious safety hazards and will void the warranty.
Inspect Safety/Relief Valve
This valve should be inspected and tested on a weekly
basis. The safety valve automatically releases air if the
tank pressure exceeds the preset maximum.
pour it down a drain.
Check the safety/relief valve by pulling the rings.
It is spring loaded and should not be stuck but
come out about ¼” and then snap back into
position when released.
Replace safety/relief valves that do not operate
freely with a valve of the same pressure rating.
WARNING: Safety/Relief valve hazards
If the safety/relief valve does not work properly, overpressurization may occur causing air tank rupture or
explosion. Occasionally pull the ring on the safety valve
to make sure the safety valve operates freely. If the
valve is stuck or does not operate smoothly, it must be
replaced with a valve having the same pressure rating.
Inspect Air Filter
Inspect the compressor’s air filter on a weekly basis. A
dirty air filter will not allow the air compressor to operate
at full capacity.
Clean air filter if dirty and restricted air flow.
Replace the air filter every 12 months or 1000
hours.
Note: Do not operate with the air filter removed.
Keep Compressor Clean
Do not allow air intakes to become blocked. If dust or
debris accumulates in the compressor, clean with a
damp cloth or soft bristle brush.
Note: Do not spray compressor with a garden hose or
pressure washer. Water may enter the compressor
and cause damage to the motor and pump.
20
Inspect Compressor for Air Leaks
Full
Add
Inspect system for air leaks on a monthly basis. To test:
Squirt soapy water around joints during
compressor operation and watch for bubbles.
Developing bubbles indicate a leak is present.
Tighten fittings, if necessary.
Change Pump Oil
WARNING: Burn hazard
Never open oil fill port while compressor is running. Hot
oil can spray over face and body.
After the first 50 hours of use then every 3 months or
500 hours, change pump oil while crankcase is still
warm. (See “Appendix A: Lubricants” for suitable
alternatives.)
1. Remove the oil fill and drain plugs. Collect the oil
in a suitable container.
2. Replace the oil drain plug and refill compressor
crankcase with clean oil.
3. Replace the oil fill plug.
4. Start the unit and run for several minutes. Shut
down the air compressor and recheck the oil
level. If necessary, add more oil. (Figure 15)
Check Drive Belt for Tension and Alignment
CAUTION: Pulley/sheave hazard
Improper pulley/sheave alignment and belt tension can
result in motor overload, excessive vibration and
premature belt and/or bearing failure. To prevent this
from happening, check the pulley/sheave alignment and
belt tension on a regular basis.
Belts will stretch from normal use. When properly
adjusted, a 5 lb. force applied to the belt between the
motor pulley and the pump will deflect the belt about ½”.
To align and adjust drive belt tension:
1. Remove the belt guard cover.
2. Loosen the four fasteners securing the motor to
the compressor unit.
3. Slide the motor to achieve proper belt tension.
(Usually 1/8” to 1/4” is sufficient.) The belt must
be properly aligned before refastening the motor.
4. To align belt, lay a straight edge against the face
of the compressor sheave (flywheel) touching the
rim at two places. (Figure 16)
Figure 15
Drain Receiver Tank and Inspect Tank
Drain water from the receiver tank daily. Water left in the
tank can cause the tank to weaken and corrode,
increasing the risk of tank rupture. Badly rested receiver
tanks must be replaced.
NorthStar recommends a tank inspection after every 2
years of service. See “Inspection of Unfired Pressure
Vessels,” volumes 2-9, August 2001, Bill McStraw
(available on-line at NTIS).”
WARNING: Air tank hazards
Failure to replace a rusted air receiver tank will
eventually result in tank rupture or explosion, which
could cause substantial property damage, severe
personal injury, or death. Never modify or repair a tank.
Obtain replacement from service center.
Figure 16
5. Adjust the motor pulley by shifting the motor so
that the belt runs parallel to the straight edge.
6. If necessary, use a gear puller to move the motor
pulley. Tighten set screw after motor pulley is
positioned.
7. Check for proper belt tension. (Figure 17)
Figure 17
8. Tighten the four fasteners holding the motor to
the top plate while tension and alignment is
maintained.
9. Attach the belt guard cover.
21
Keep Compressor Clean
Do not allow air intakes to become blocked. If dust or
debris accumulates in the compressor, clean the
compressor with a damp cloth or soft bristle brush.
Note: Do not spray compressor with a garden hose or
pressure washer. Water may enter the compressor
and cause damage to the engine and pump.
Contact NorthStar Product Support at 1-800-270-0810
for any questions, problems, or parts orders.
IMPORTANT
If a part needs replacement, only use parts that meet
the manufacturer’s part number specifications.
Replacement parts that do not meet specifications may
result in a safety hazard or poor operation of the
compressor. Major service, including installation or
replacement of parts, should be made by a qualified
electrical service technician.
22
Troubleshooting
PROBLEM
POSSIBLE CAUSE
Motor does not turn.
A,B,C,D,E
Motor overload trips or draws excessive current.
D, G, M
Excessive noise, vibration, knocking or rattling.
H, I, K, L,N, O, P, R, W
Lights flicker or dim when running.
C, D, E, J, M
Air delivery drops off.
I, J, L, M, N, O, P, R, W, X, Y
Compressor does not come up to speed.
C, D, F, H, L, M, P
Compressor is slow to come up to speed.
C, D, F, H, L, M, N
Compressor will not unload cycle.
I, N, P, R
Compressor will not unload when stopped.
I, N, P, R
Excessive starting or stopping.
D, E, G, P, S, U
Moisture in crankcase, “milky” substance in oil.
T
Oil in discharge air.
V
Safety/relief valve “pops”.
N, O, P
Low interstage pressure.
Y
High interstage pressure.
X
POSSIBLE CAUSE
POSSIBLE SOLUTION
A.) Circuit breaker on motor tripped.
Push button located on back of motor.
B.) Supply line circuit breaker tripped.
Reset circuit breaker.
C.) Wiring or electric service panel too small.
Install properly sized wire or service box. Contact electrician.
D.) Compressor wired incorrectly.
Check wiring, contact electrician.
E.) Poor contact on motor terminals or starter connections.
Ensure good contact on motor terminals or starter
connections.
F.) Compressor viscosity too high for ambient temperature
Drain existing lubricant and refill with proper lubricant.
G) Poor ground.
Check all ground connections.
H.) Belt tension too tight or sheaves not aligned
Check tension/ alignment.
i.) Air leaks in discharge piping
Check tubing connections, Tighten joints or replace as
required.
J.) Poor power regulation
Contact power company.
K.) Compressor components leaky, broken, loose
Inspect components. Clean or replace as required.
L.) Loose flywheel or motor pulley, excessive end play in
motor shaft or loose drive belts
Check flywheel, motor pulley, crankshaft drive belt
tension/alignment. Replace or repair as required.
M.) Leaking check valve or check valve seat blown out
Replace check valve.
N.) Clogged or dirty inlet and/or discharge line
Clean or replace.
O.) Defective safety/relief valve
Replace.
P.) Pressure switch unloader leaks or does not work
Realign stem or replace.
Q.) Inadequate ventilation around flywheel
Relocate compressor for better air flow.
R.) Leaking, broken or worn inlet unloader parts at check
valve
Inspect parts and replace as required.
S.) Excessive condensation in receiver tank
Drain receiver tank.
T.) Detergent lubricant in crankcase.
Replace with proper lubricant.
U.) Light duty cycle
Increase duty cycle.
V.) Lubricant level too high
Drain excess lubricant.
W.) Worn cylinder finish
Deglaze cylinder with 180 grit flex-hone.
X,) Low pressure inlet valve leaking
Inspect, clean or repair as required.
Y.) High pressure inlet valve leaking
Inspect, clean or repair as required.
This section provides a list of the more frequently encountered compressor malfunctions, their causes and corrective
actions. Some corrective actions can be performed by the operator or maintenance personnel, but others may require
assistance of a qualified electrician or Service Center.
23
Parts List – Model 47500 Rev A.2
Note: NorthStar tank decal part # 789000 (no shown)
24
Parts List – Model 47500 Rev A.2
Ref#
Part#
Description
Qty Ref#
Part#
Description
Qty
1
792363
Pump *
1 17
Kit # 4
Tube Fitting
1 2 N/A
Tank
1 18
792367
Electric Cable
1 3 792364
Motor **
1 19
792368
Pulley 1 4
792365
Oil Drain Plug Extender
1 20
792369
Service Valve
1
5
See Pump
Oil Drain Plug
1 21
792370
Belt A51
1 6 Kit # 1
Pressure Switch
1 22
792371
Belt Guard Assembly
1 7 792366
Pressure Relief Valve
1 23
See Pump
Air Filter Housing
2
8
Kit # 1
Plug 2
24
See Pump
Filter Element
2 9 Pressure Gauge
1
25
Kit # 1
Kit # 5
Adaptor
2
10
Nipple
1 11
See Pump
Magnetic Drain Plug
1 26
792372
Belt Guard Bottom Cover ***
1
12
Kit # 2
Check Valve
1 27
Kit # 5
Water Drain Valve
1
13
Nipple
1 28
Washer
1
14
Kit # 3
Elbow
1 29
Kit # 4
Straight Tube Fitting
1
15
Discharge Tube
1 30
Kit # 4
Water Drain Tube
1
16
Tube w/Ferrules & Nuts
1
Kit # 1
Kit # 4
Pressure Switch Kit - # 792377
Drain Tube Kit - # 792380
Ref#
Description
Qty
Kit Qty
Ref#
Description
Qty
Kit Qty
6
Pressure Switch
1 1
17
Tube Fitting
1 1 8
Plug
2 29
Straight Tube Fitting
1 9 Pressure Gauge
1 30
Water Drain Tube
1
10
Nipple
1 Kit # 5
25
Adaptor
1 Drain Valve Kit - # 792381
Kit # 2
Ref#
Description
Qty
Kit Qty
Check Valve Kit - # 792378
25
Adaptor
1
1
Ref#
Description
Qty
Kit Qty
27
Water Drain Valve
1
12
Check Valve
1 1
28
Washer
1
13
Nipple
1
Kit # 3
Tube Kit - # 792379
Ref#
Description
Qty
Kit Qty
14
Elbow
1 1
15
Discharge Tube
1 16
Tube w/Ferrules & Nuts
1
Note: Kit Qty is the number of kits needed to repair unit
*Fastener Kit for Pump - # 792384 Qty
Bolt 5/16 x 1 -1/4 T18/in Grade 5 4
Nut T18/in flange lock 4
**Fastener Kit for Motor - # 792385 Qty
Bolt 5/16 x 1 T18/in Carriage Grade 5 4
Nut T18/in flange lock 4
***Fastener Kit for Belt Guard - # 792386 Qty
Bolt 5/16 x 1T18/in Grade 2 7
Nut T18/in flange lock 3
Fender washer 5/16 3
Washer 5/16 SAE 4
25
792363 Pump Exploded View
26
792363 Pump Parts List
Ref#
Part#
Description
Qty
1
Kit # 1
Cylinder head
2 2 Allen bolt set
8 3 789354
Air filter 2 4
789355
Filter element
2
5
See part # 6
Kit # 2
Cylinder head gasket
2
6
792324
In.& ex. valve assembly
2
7
See part # 6
Kit # 2
Valve seat gasket
2
8
Kit # 3
Stud Screw
8 9 Kit # 4
Cylinder
2
10
Kit # 2
Kit # 4
Kit # 5
Cylinder gasket
2
11
792325
Kit # 4
Kit # 5
Piston ring kit
2
12
Kit # 4
Piston 2 13
792326
Rod
2
14
N/A
Crankcase
1
15
788879
Oil draining plug
1
16
Kit # 2
Front cover gasket
1
17
N/A
Front cover
1
18
N/A
Hex bolt 4 19
788880
Oil sight gauge
1
20
789386
Oil cap 1 21
792328
Bearing 1 22
N/A
Crankshaft and balancer
1
23
792329
Bearing 1 24
Kit # 2
Rear bearing seat gasket
1
25
N/A
Rear bearing seat
1
26
N/A
Hex bolt 4 27
Kit # 2
Oil seal
1
28
788882
Breather
1
29
789366
Pulley 1 30
Kit # 6
Fender washer
1
31
Hex bolt
1
32
Kit # 7
Exhaust elbow
1
33
Exhaust pipe
1
34
Discharge tube set
1
35
See part # 6
In.& ex. valve seat
2
36
See part # 11
Compression ring
4
37
See part # 11
Oil control ring
2
38
789384
Magnetic plug
1 * 789524
Wing nut, air filter
2
27
792363 Pump Kit List
Kit # 1
Cylinder Head and Bolt Kit - # 789336
Ref#
Description
Qty
Kit Qty
1
Cylinder head
1 2 2
Allen bolt set
4
Kit # 2
Gasket Kit - # 789339
Ref#
Description
Qty
Kit Qty
5
Cylinder head gasket
2 1 7
Valve seat gasket
2
10
Cylinder gasket
2
16
Front cover gasket
1
24
Rear bearing seat gasket
1
27
Oil seal
1
Kit # 3
Screw Kit - # 789358
Ref#
Description
Qty
Kit Qty
8
Stud Screw
4
2
Kit # 4
Cylinder and Piston Kit - # 789342
Ref#
Description
Qty
Kit Qty
9
Cylinder
1 2 10
Cylinder gasket
1
11
Piston ring kit
1
12
Piston
1
Kit # 5
Piston Ring Kit - # 789359
Ref#
Description
Qty
Kit Qty
10
Cylinder gasket
1
2
11
Piston ring kit
1
Kit # 6
Washer and Bolt - # 789367
Ref#
Description
Qty
Kit Qty
30
Fender washer
1 1 31
Hex bolt
1
Kit # 7
Exhaust Fitting and Tube Kit - # 792347
Ref#
Description
Qty
Kit Qty
32
Exhaust elbow
1 1 33
Exhaust pipe
1
34
Discharge tube set
1
Note: Kit Qty is the number of kits needed to repair pump
28
Note: NorthStar tank decal part # 789000 (no shown)
Parts List – Model 47501 Rev A.2
29
Parts List – Model 47501 Rev A.2
Ref#
Part#
Description
Qty Ref#
Part#
Description
Qty
1
792373
Pump *
1 17
Kit # 3
Tube w/Ferrules & Nuts
1 2 N/A
Tank
1 18
Kit # 1
Pressure Gauge
1 3 792374
Motor **
1 19
Kit # 4
Tube Fitting
1 4 792375
Pulley
1 20
792376
Belt A48
1 5 Kit # 1
Pressure Switch
1 21
792372
Belt Guard Bottom Cover ***
1 6 792366
Pressure Relief Valve
1 22
792371
Belt Guard Assembly
1 7 792340
Oil Drain Plug Extender
1 23
See Pump
Air Filter Housing
2 8 Kit # 1
Plug 2
24
See Pump
Filter Element
2 9 792369
Service Valve
1
25
Kit # 1
Kit # 5
Adaptor
2
10
Kit # 1
Nipple
1 11
792367
Electric Cable
1 26
See Pump
Magnetic Drain Plug
1
12
See Pump
Oil Drain Plug
1 27
Kit # 5
Water Drain Valve
1
13
Kit # 2
Check Valve
1 28
Washer
1
14
Kit # 3
Elbow
1 29
Kit # 4
Straight Tube Fitting
1
15
Discharge Tube
1 30
Kit # 4
Water Drain Tube
1
16
Kit # 2
Nipple
1
Kit # 1
Kit # 4
Pressure Switch Kit - # 792377
Drain Tube Kit - # 792380
Ref#
Description
Qty
Kit Qty
Ref#
Description
Qty
Kit Qty
5
Pressure Switch
1 1
19
Tube Fitting
1 1 8
Plug
2 29
Straight Tube Fitting
1
10
Nipple
1 30
Water Drain Tube
1
18
Pressure Gauge
1 Kit # 5
25
Adaptor
1 Drain Valve Kit - # 792381
Kit # 2
Ref#
Description
Qty
Kit Qty
Check Valve Kit - # 792378
25
Adaptor
1 1 Ref#
Description
Qty
Kit Qty
27
Water Drain Valve
1
13
Check Valve
1 1
28
Washer
1
16
Nipple
1 Kit # 3
Tube Kit - # 792382
Ref#
Description
Qty
Kit Qty 14
Elbow
1 1
15
Discharge Tube
1
17
Tube w/Ferrules & Nuts
1
Note: Kit Qty is the number of kits needed to repair unit
*Fastener Kit for Pump - # 792384 Qty
Bolt 5/16 x 1 -1/4 T18/in Grade 5 4
Nut T18/in flange lock 4
**Fastener Kit for Motor - # 792385 Qty
Bolt 5/16 x 1 T18/in Carriage Grade 5 4
Nut T18/in flange lock 4
***Fastener Kit for Belt Guard - # 792386 Qty
Bolt 5/16 x 1T18/in Grade 2 7
Nut T18/in flange lock 3
Fender washer 5/16 3
Washer 5/16 SAE 4
30
792373 Pump Parts List
*Wing nut for # 30 not shown
31
792373 Pump Parts List
Ref#
Part#
Description
Qty
1
Kit # 1
Cylinder head
3 2 Allen bolt set
12 3 792324
In.& ex. valve assembly
3 4 Kit # 3
Stud Screw
12 5 Kit # 4
Cylinder
3
6
Kit # 2
Kit # 4
Kit # 5
Cylinder gasket
3
7
792325
Kit # 4
Kit # 5
Piston ring kit
3
8
Kit # 5
Piston
3
9
792332
Rod
2
10
N/A
Crankcase
1
11
788879
Oil draining plug
1
12
788880
Oil sight gauge
1
13
789386
Oil cap 1 14
792333
Bearing
1
15
N/A
Crankshaft and balancer
1
16
789384
Magnetic plug
1
17
792329
Bearing
1
18
Kit # 2
Rear bearing seat gasket
1
19
N/A
Rear bearing seat
1
21
N/A
Hex bolt 4 22
Kit # 2
Oil seal 1 20
788882
Breather
1
23
789349
Pulley 1 24
Kit # 6
Fender washer
1
25
Hex bolt 1 26
792335
Rod 1 27
Kit # 7
Exhaust elbow
1
28
Exhaust fitting
1
29
792336
Discharge tube
2
30
789354
Air filter 3 31
789355
Filter element
3
32
Kit # 7
Exhaust fitting
1
*
789524
Wing nut, air filter
3
32
792373 Pump Parts List
Kit # 1
Cylinder Head and Bolt Kit - # 789336
Ref#
Description
Qty
Kit Qty
1
Cylinder head
1 3 2
Allen bolt set
4
Kit # 2
Gasket Kit - # 792342
Ref#
Description
Qty
Kit Qty
6
Cylinder gasket
3 1 18
Rear bearing seat gasket
1
22
Oil seal
1
Kit # 3
Screw Kit - # 789358
Ref#
Description
Qty
Kit Qty
4
Stud Screw
4
3
Kit # 4
Cylinder and Piston Kit - # 792343
Ref#
Description
Qty
Kit Qty
5
Cylinder
1 3 6
Cylinder gasket
1
7
Piston ring kit
1
8
Piston
1
Kit # 5
Piston Ring Kit - #792344
Ref#
Description
Qty
Kit Qty
6
Cylinder gasket
1
3
7
Piston ring kit
1
Kit # 6
Washer and Bolt - # 789367
Ref#
Description
Qty
Kit Qty
24
Fender washer
1 1 25
Hex bolt
1
Kit # 7
Exhaust Fitting Kit - # 792345
Ref#
Description
Qty
Kit Qty
27
Exhaust elbow
1
1
28
Exhaust fitting
1
32
Exhaust fitting
1
Note: Kit Qty is the number of kits needed to repair pump
33
Appendix A: Lubricants and Compatibility
Suitable
Not Recommended
Viton®, Teflon®, Epoxy
(Glass Filled), Oil
Resistant Alkyd,
Fluorosilicone,
Flourocarbon,
Polysulfide, 2Component
Urethane, Nylon,
Delrin®, Celcon®, High
Nitrile Rubber (Buna N.
NBR more than 36
Acrylonite),
Polyurethane,
Polyethylene,
Epichlorohydrin,
Polyacrylate, Melamine,
Polypropylene, Baked
Phenolics, Epoxy,
Modified Alkyds
(® indicates trademark
of DuPont Corporation)
Neoprene, Natural
Rubber, SBR Rubber,
Acrylic Paint, Lacquer,
Varnish, Polystyrene,
PVC, ABS,
Polycarbonite, Cellulose
Acetate, Latex, EPR,
Acrylics, Phenoxy,
Polysulfones, Styrene
Acrylonitile (San), Butyl
Temperature around
Compressor
Viscosity Grade
ISO
SAE
Below 40ºF (4ºC)
60
20
40ºF to 80ºF
(4ºC to 27ºC)
100
30
80ºF to 100ºF
(27ºC to 38ºC)
150
40
The following table lists materials that are suitable or not
recommended for use with synthetic oil. As some oil
escapes into the compressed air, all components that
come into contact with the air (i.e., piping, filters, hoses,
tools, etc) must be compatible with synthetic oil.
NorthStar recommends using synthetic oil after the first
50 hour break in period.
Alternate Lubricants
You may use a petroleum-based lubricant that is
premium quality, does not contain detergents, contains
only anti-rust, anti-oxidation, and anti-foam agents as
additives, has a flashpoint of 440ºF (227ºC) or higher,
and has an auto-ignition point of 650ºF (343ºC) or
higher.
See the petroleum lubricant viscosity table below. The
table is intended as a general guide only. Heavy-duty
operating conditions require heavier viscosities.
Refer specific operating conditions to NorthStar Product
Support at 1-800-270-0810.
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Limited Warranty
NorthStar Warranty
Item #
Consumer Warranty Period
Commercial Warranty Period
47500
47501
4 years from date of purchase by user
2 years from date of purchase by user
Dear Valued Customer:
The NorthStar Product you just purchased is built with the finest material and craftsmanship. Use this product properly and enjoy the benefits
from its high performance. By purchasing a NorthStar product, you show a desire for quality and durability. Like all mechanical equipment this
unit requires a due amount of care. Treat this unit like the high quality piece of machinery it is. Neglect and improper handling may impair its
performance. Please thoroughly read the instructions and understand the operation before using your product. Always contact NorthStar
Product Support at 1-800-270-0810 prior to having any service or warranty work performed, as some services performed by parties other than
NorthStar approved service centers may void this warranty. This warranty is in lieu of any other warranty expressed or implied and NorthStar
assumes no other responsibility or liability outside that expressed within this warranty.
Limited Warranty
NorthStar shall warranty any piece of equipment manufactured, or parts of equipment manufactured, to be free from defects in material or
workmanship for a period of:
“Consumer use” means personal residential household use by a consumer. “Commercial use” means all other uses, including use for
commercial, income producing or rental purposes or when purchased by a business.
This warranty applies to the original purchaser of the equipment (verification of purchase, in the form of a receipt, is the responsibility of the
buyer), is non-transferable, and covers parts and labor. Parts will be replaced or repaired at no charge, except when the equipment has failed
due to lack of proper maintenance. If a part is no longer available, the part may be replaced with a similar part of equal function. Any misuse,
abuse, alteration or improper installation or operations will void warranty. Determining whether a part is to be replaced or repaired is the sole
decision of NorthStar. NorthStar will not provide for replacement of complete products due to defective parts. Any costs incurred due to
replacement or repair of items outside of a NorthStar approved facility is the responsibility of the buyer and not covered under warranty.
Transportation costs to and from service center is the responsibility of the customer.
In addition to the normal warranty, NorthStar shall warrant any normal wear item from defects in material or workmanship for a period of 90
days from the date of purchase by user. Normal wear items include, but are not limited to, belts and filter elements.
This warranty specifically excludes the following; failure of parts due to damage caused by accident, fire, flood, windstorm, acts of God,
applications not approved by NorthStar in writing, corrosion caused by chemicals, use of replacement parts which do not conform to
manufacturer’s specifications, damage related to rodent and/or insect infestation and damage caused by vandalism. Additional exclusions:
loss of running time, inconvenience, loss of income, or loss of use, including any implied warranty of merchantability of fitness for a specific
use. Also, Power Equipment needs periodic parts and service to perform well, and this warranty does not cover instances when normal use
has exhausted the life of a component or the motor.
This warranty does not cover any personal injury or damage to surrounding property caused by failure of any part. Repair or replacement of
parts does not extend the warranty period.
Please fill in the following information and have it on hand when you call in on a warranty claim.
Customer Number: ______________________________________________________________
Date of Purchase: _______________________________________________________________
NorthStar Serial Number: _________________________________________________________
Item Number: __________________________________________________________________
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Assembled by
Northern Tool & Equipment Company, Inc.
Burnsville, MN 55306
NorthernTool.com
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