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NorthStar M459392L - User Manual

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M459392L
Owner’s Manual
Gasoline Portable Air Compressor
(For Outdoor Use only)
Instructions for Installation/Set-up, Operation, Maintenance, & Storage
This NorthStar® belt-driven compressor has a single stage 2-cylinder pump, an engine with cast iron cylinders for
long life, and a compact design rated for 130 maximum PSI. Its continuous-duty rating ensures long-lasting
performance, and its cast iron pump head ensures superior heat dissipation. Lift eyes are provided for lifting or tying
down.
Read and understand this Owner’s Manual completely before using and keep this manual for review. Failure to
properly set up, operate, and maintain this compressor in accordance to this manual could result in injury or death to
operator or bystanders.
WARNING: SPECIAL HAZARDS
• CO Poisoning: Exhaust from engine contains carbon monoxide, a poisonous gas that can cause carbon monoxide
poisoning and possible death if inhaled. ONLY run air compressor OUTDOORS and at least 20 feet from the home, away
from windows, vents and air intakes, to allow proper ventilation. If you start to feel sick, dizzy, or weak while using the air
compressor, shut off the engine and get to fresh air RIGHT AWAY.
• 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.
• Electric shock: Operating equipment in wet conditions or near water can cause electric shock.
• 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, engine and discharge tubing are hot surfaces that can cause burn injuries.
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.
Add Engine Oil: Engine is shipped without oil. See engine manual for instructions on capacity and viscosity
recommendations.
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. Lifting eyes are provided.
Run Pump Unloaded for Break-in Period: Before initial use, open drain plug and run compressor for 20 minutes to
break in pump parts.
Follow Maintenance Schedule: Engine, pump, air filter, and tank require periodic inspection and servicing to keep
compressor functioning efficiently. See “Maintenance Schedule Summary” for frequency of servicing.
ITEM NUMBER: 459392
SERIAL NUMBER: _____________

Table of Contents

Questions and Answers

  • H
    hnelsonAug 16, 2025
    Why does the safety/relief valve keep popping on my NorthStar Air Compressor?
    • G
      Gregory FinleyAug 17, 2025
      If the safety/relief valve on your NorthStar Air Compressor is popping, it could be due to a few reasons. The inlet and/or discharge line might be clogged or dirty, so you should clean or replace them. Also, the safety/relief valve itself could be defective and need replacement. The unloader may also be leaking or not working, requiring realignment or replacement.
  • A
    Amanda PenningtonAug 19, 2025
    What to do if air delivery drops off on NorthStar Air Compressor?
    • K
      Kayla MillerAug 19, 2025
      If you notice air delivery dropping off in your NorthStar Air Compressor, start by checking for air leaks in the discharge piping. Tighten any loose tubing connections, and replace parts as needed. Also, inspect the compressor components for leaks, breaks, or looseness, cleaning or replacing them as necessary. Check the flywheel, engine pulley, crankshaft drive belt tension and alignment. Replace or repair if required. A clogged or dirty inlet and/or discharge line can also cause this issue, so clean or replace them. Finally, a defective safety/relief valve or a faulty unloader can be the culprit, so replace the valve or realign the unloader stem, respectively.
  • C
    Corey PopeAug 22, 2025
    What to do if NorthStar Air Compressor will not unload cycle?
    • H
      hbanksAug 22, 2025
      If your NorthStar Air Compressor will not unload cycle, it might be due to several reasons. Check for air leaks in the discharge piping, and tighten the tubing connections or replace if required. A clogged or dirty inlet and/or discharge line can cause this, so clean or replace them. The unloader may be leaking or not working, try to realign stem or replace. Also, inspect the inlet unloader parts at the check valve for leaks, breaks, or wear, and replace them as needed.
  • C
    Charles SimmonsAug 25, 2025
    Why is my NorthStar Air Compressor slow to come up to speed?
    • J
      Joseph HuntAug 26, 2025
      If your NorthStar Air Compressor is slow to come up to speed, several factors could be responsible. The compressor lubricant might be too viscous for the ambient temperature; in this case, drain the existing lubricant and refill with a more suitable one. Check the belt tension and alignment of the sheaves. Inspect the flywheel, engine pulley, and crankshaft drive belt tension/alignment, replacing or repairing as needed. A leaking check valve or a blown-out check valve seat can also cause this issue, so replace the check valve. Lastly, a clogged or dirty inlet and/or discharge line can restrict performance, so clean or replace them.
  • W
    williamscarolAug 27, 2025
    Why NorthStar Air Compressor does not come up to speed?
    • R
      Ray LucasAug 27, 2025
      If your NorthStar Air Compressor does not come up to speed, there are a few potential causes. The compressor lubricant might be too viscous for the current ambient temperature, requiring you to drain the existing lubricant and replace it with a more appropriate one. Check the belt tension and alignment of the sheaves. Inspect the flywheel, engine pulley, and crankshaft drive belt tension/alignment, replacing or repairing as needed. A leaking check valve or a blown-out check valve seat can also prevent the compressor from reaching full speed, so replace the check valve.
  • E
    Elizabeth RodriguezAug 30, 2025
    What to do if NorthStar Air Compressor will not unload when stopped?
    • M
      Matthew StantonAug 30, 2025
      If your NorthStar Air Compressor will not unload when stopped, it might be due to a few issues. Check for air leaks in the discharge piping, and tighten the tubing connections or replace them as needed. A clogged or dirty inlet and/or discharge line can also cause this, so clean or replace the affected components. The unloader may be leaking or not working properly; in this case, try to realign the stem or replace the unloader. Additionally, inspect the inlet unloader parts at the check valve for leaks, breaks, or wear, and replace them as necessary.
  • C
    Christina CollinsSep 2, 2025
    Why is my NorthStar Air Compressor starting and stopping too often?
    • N
      Nicole GriffinSep 2, 2025
      If your NorthStar Air Compressor is starting and stopping excessively, it could be due to a couple of reasons. The unloader might be leaking or malfunctioning, requiring you to realign the stem or replace the unit. Also, there might be excessive condensation in the receiver tank, so drain the tank.
  • V
    Vickie TaylorSep 4, 2025
    Why is there moisture in the crankcase of my NorthStar Air Compressor?
    • L
      lorimclaughlinSep 4, 2025
      If you find moisture in the crankcase of your NorthStar Air Compressor, appearing as a milky substance in the oil, it's likely due to detergent lubricant being used in the crankcase. Replace it with the correct lubricant.
  • M
    Mary StricklandSep 7, 2025
    Why is there oil in the discharge air from my NorthStar Air Compressor?
    • J
      jennifer57Sep 7, 2025
      If you notice oil in the discharge air of your NorthStar Air Compressor, it's likely because the lubricant level is too high. Drain the excess lubricant to resolve this issue.
  • J
    jacquelineruizSep 10, 2025
    What causes low interstage pressure in a NorthStar Air Compressor?
    • J
      jbrownSep 12, 2025
      If you are experiencing low interstage pressure in your NorthStar Air Compressor, the high pressure inlet valve may be leaking. Inspect, clean, or repair it as required.

NorthStar M459392L Specifications

General IconGeneral
BrandNorthStar
ModelM459392L
CategoryAir Compressor
LanguageEnglish

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