Sullair 425H User Manual (English)

Other manuals for Sullair 425H

Questions and Answers:

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jamescoxAug 18, 2025
Why is my Sullair Air Compressor not achieving full discharge pressure?
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  Laura PearsonAug 19, 2025
  If your Sullair air compressor isn't reaching full discharge pressure, it could be due to: * The run/start valve not being in the run position (for compressors with idle warm-up controls, switch the valve to RUN). * Excessive air demand (check service lines for leaks or open valves). * A dirty air filter (check the filter and change the element if required). * A defective pressure regulator (check the diaphragm and replace with a kit if necessary). * A defective idle warm-up control (replace the control).
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bakerchaseAug 21, 2025
What causes improper unloading with excessive pressure build-up in Sullair 425H Air Compressor?
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  buchananjosephAug 21, 2025
  Improper unloading with excessive pressure build-up in your Sullair Air Compressor can result from: * A pressure regulating valve set too high; readjust it. * A control system leak causing loss of pressure signal; check control lines. * A defective pressure regulating valve; repair the valve (kit available). * An inlet valve jammed; free or replace the valve. * A restriction in the control system; check all control lines and components for ice or other contaminants. * A defective pressure relief valve that opens when the pressure is too low; replace the pressure relief valve. * A defective pressure regulator; check the diaphragm and replace it with a kit if necessary.
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rcarrilloAug 23, 2025
What to do if my Sullair Air Compressor shows SSAM flash code one?
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  bradleymartinAug 23, 2025
  If your Sullair Air Compressor displays SSAM flash code one, it indicates a potential issue with the compressor temperature. Here's what you should do: * Check the wiring connection to the compressor temperature switch and tighten it if it's loose. * Check the switch continuity to ground and replace it if necessary. * Ensure the receiver tank fluid level is adequate and add fluid if needed. * Inspect the fan belt for looseness or breakage, tightening or replacing it as required. * Address insufficient cooling airflow by cleaning the fluid cooler core and ensuring proper ventilation. * Change the fluid filter element if it's clogged. * Consider changing the fluid thermostat element if it's faulty. * If the fluid cooler tube is plugged internally, replace the cooler.
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Christopher HunterAug 26, 2025
How to troubleshoot SSAM flash code two on a Sullair Air Compressor?
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  Tyler HickmanAug 26, 2025
  When your Sullair Air Compressor shows SSAM flash code two, this usually points to a problem with the engine coolant temperature. Here's how to troubleshoot: * Check the wiring connection to the engine coolant temperature switch and tighten it if necessary. * Check the switch continuity to ground and replace if necessary. * Ensure adequate cooling airflow by cleaning the cooler and verifying proper ventilation. * Inspect the fan belt; tighten or replace if loose or broken. * Check the engine coolant level and fill with the correct water/glycol mixture if low. * Change the water pump if it's faulty. * Replace the engine thermostat element if it's defective.
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Monica SimmonsAug 28, 2025
What does SSAM flash code three mean on my Sullair Air Compressor?
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  Nicolas ParkerAug 28, 2025
  SSAM flash code three on your Sullair Air Compressor indicates a potential issue with the engine oil pressure switch. You should: * Check the wiring connection to the switch and tighten it if necessary. * Install a gauge in parallel with the switch. Replace the switch if the pressure exceeds 15 psig and stays open.
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Tina WhiteAug 30, 2025
Why is my Sullair 425H Air Compressor engine coolant temperature high?
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  Megan BennettAug 30, 2025
  Several factors can cause the engine coolant temperature to be high: * The engine coolant temperature switch may be open; check the wiring connection and tighten if necessary, or check the switch continuity to ground and replace if necessary. * Insufficient cooling airflow; clean the cooler and check for proper ventilation. * A loose or broken fan belt; tighten or replace the belt. * Low engine coolant; fill with the proper water/glycol mixture as required. * A faulty water pump; change the pump. * A defective engine thermostat; change the thermostat element.
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Joseph DavisSep 1, 2025
What causes high temperature in my Sullair 425H?
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  Matthew RothSep 1, 2025
  High compressor temperature could be due to: * An open compressor temperature switch; check the wiring connection and tighten if loose, or check switch continuity to ground and replace if necessary. * Low receiver tank fluid level; add fluid to the receiver tank as required. * A loose or broken fan belt; tighten or replace the belt. * Insufficient cooling air flow or a dirty fluid cooler core; clean the core thoroughly and check for proper ventilation. * A clogged compressor fluid filter; change the fluid filter element. * A faulty fluid thermostat; change the fluid thermostat element. * A plugged fluid cooler tube (internal); replace the cooler.
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Jordan BradfordSep 4, 2025
What causes insufficient air delivery in a Sullair 425H Air Compressor?
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  Whitney PorterSep 4, 2025
  Insufficient air delivery in your Sullair air compressor can be caused by several factors: * The run/start valve might not be in the run position; if your compressor has idle warm-up controls, switch the valve to RUN for full operation. * A plugged air filter; replace it. * A defective idle warm-up valve; replace the valve. * A plugged air/fluid separator; replace the separator element and also change the compressor fluid and fluid filter. * A defective pressure regulator; adjust or repair it.
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Stephanie WilliamsSep 6, 2025
What causes excessive fluid consumption in a Sullair Air Compressor?
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  Kim MunozSep 6, 2025
  Excessive compressor fluid consumption in your Sullair Air Compressor may be due to: * A clogged return line; clear the orifice and return line strainer. * A lubrication system leak; check all pipes, connections, and components. * A separator element that is damaged or malfunctioning; change the separator element.
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Julie CarterSep 8, 2025
What to do if the Sullair Air Compressor engine speed is too low?
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  meganrodriguezSep 8, 2025
  If the engine speed of your Sullair air compressor is too low, consider the following: * Check and tighten the battery cables if the battery voltage is low. * Recharge or replace the battery if necessary. * Refuel if there is no fuel. * Drain water from the fuel/water separators on the fuel filters, and siphon water from the fuel tank, cleaning the tank if necessary, if there is water or dirt in the fuel and/or filter. * Clean and replace the air filter if it is plugged. * Replace the fuel filter if it is plugged. * Check wiring and tighten all connectors, and replace the relay if the starter solenoid relay does not engage. * Check alternator 'W' terminal (7.5 ± 2.50 VAC greater than 300 HZ) if there is no input frequency from the alternator.

Sullair 425H Specifications

General

Model	425H
Type	Portable Rotary Screw Air Compressor
Maximum Pressure	150 psi
Flow Rate	425 cfm
Air Delivery	425 cfm
Noise Level	76 dBA
Drive Type	Direct Drive
Engine	John Deere 4045
Fuel Tank Capacity	58 gallons