Sullair 375 User Manual

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OPERATOR’S MANUAL AND PARTS LIST

Po r t a b l e ai r Co m P r e s s o r

300HH, 375, 375H a n d 425 ex P o r t

Caterpillar Standard and Aftercooled and Filtered

PART NUMBER:

02250169-733

©

SULLAIR CORPORATION

The information in this document

is correct at the time of printing for

portable compressor serial number

200705010000

and all subsequent serial numbers.

KEEP FOR

FUTURE

REFERENCE

Table of Contents

Other manuals for Sullair 375

User Manual80 pages

Questions and Answers:

A
amanda11Aug 18, 2025
What does SSAM flash code two flashes mean on a Sullair 375?
- M
  Michelle BarnesAug 18, 2025
  If your Sullair Air Compressor shows SSAM flash code two flashes, it indicates that the engine coolant temperature switch is open, insufficient cooling airflow, or a loose/broken fan belt, or no engine coolant. Check the wiring connection to the switch and tighten it if necessary. Also, check the switch continuity to ground and replace if necessary. Clean the cooler and check for proper ventilation. Check the fan belt and tighten or replace it if necessary. Fill with proper water/glycol mixture as required.
R
Rachel MartinezAug 20, 2025
What does SSAM flash code one flash mean on a Sullair 375?
- T
  tboyleAug 20, 2025
  If your Sullair Air Compressor displays SSAM flash code one flash, it means the compressor temperature switch is open. Check the wiring connection to the switch and tighten it if loose. Also, check the switch continuity to ground and replace if necessary. If the compressor feels hot refer to COMPRESSOR OVERHEATING trouble shooting procedure.
C
colliermelvinAug 22, 2025
What does SSAM flash code three flashes mean on a Sullair 375?
- B
  Brenda FlemingAug 23, 2025
  If your Sullair Air Compressor shows SSAM flash code three flashes, it indicates the engine oil pressure switch is open. Check the wiring connection to the switch and tighten if necessary. Install gauge in parallel with the switch. Replace the switch if the pressure exceeds 15 psig and stays open. If the pressure is less than 15 psig, refer to the Engine Operator’s Manual.
M
melissa84Aug 26, 2025
Why is my Sullair 375 not achieving full discharge pressure?
- K
  Kayla AllenAug 26, 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).
Z
Zachary HansenAug 27, 2025
What causes improper unloading with excessive pressure build-up in Sullair 375?
- J
  Justin McphersonAug 28, 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.
S
Stephanie RobinsonAug 30, 2025
What to do if my Sullair Air Compressor engine does not crank or start?
- C
  Catherine WatsonAug 31, 2025
  If your Sullair Air Compressor engine doesn't crank or starts, check the battery cables and tighten them if they are loose. Also, inspect the ground wire for secure attachment to the frame and tighten if needed. If the issue persists, recharge or replace the battery. Examine the fuse in the wiring harness and replace it if it's blown. Check the instrument panel connectors and wires for loose connections, breaks, or corrosion, and reattach, clean, or replace as necessary. Finally, a faulty SSAM module may also be the reason, try to replace the module.
S
Shawn JohnsonSep 1, 2025
Why is my Sullair 375 Air Compressor engine coolant temperature high?
- D
  Danielle PetersonSep 2, 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.
E
Elizabeth FullerSep 4, 2025
What causes high temperature in my Sullair 375?
- T
  Tyler Bell DDSSep 4, 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.
G
ggutierrezSep 7, 2025
What causes insufficient air delivery in a Sullair 375 Air Compressor?
- J
  Justin JonesSep 7, 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.
S
Steven Miller PhDSep 9, 2025
What causes excessive fluid consumption in a Sullair 375?
- G
  gbassSep 9, 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.

Sullair 375 Specifications

General

Free Air Delivery	375 cfm
Type	Rotary Screw
Air Delivery	375 cfm
Drive Type	Direct
Voltage	12V DC

Summary

Section 1: Safety

General Safety Precautions

Safety precautions for general operation and maintenance of the compressor.

Towing Procedures and Warnings

Procedures and warnings for safely towing the compressor unit.

Fire and Explosion Hazards

Precautions against fire and explosion risks associated with the compressor.

Moving Parts Hazards

Hazards related to moving components and necessary safety measures.

Toxic and Irritating Substance Precautions

Precautions regarding hazards from chemicals and air quality.

Electrical Shock Safety

Dangers of electrical shock and essential safety measures to prevent it.

Safe Lifting Procedures

Safe procedures for lifting and handling the compressor unit.

Jump Starting Procedures

Safe procedures for jump-starting the compressor's engine.

Lockout/Tagout Implementation

Procedures for energy isolation during maintenance and servicing.

Section 2: Description

Description of Key Components

Sullair Compressor Unit Functionality

Details the operation of the single-stage, positive displacement rotary screw compressor unit.

Compressor Cooling and Lubrication System

Explains the functions of the compressor's cooling and lubrication system.

Compressor Discharge System Functionality

Describes the air/fluid discharge system, sump functions, and separator element.

Capacity Control System Functionality

Explains how air delivery is regulated to match demand via control system.

Air Inlet System Functionality

Instrument Panel Group Functionality

Describes the instrument panel, its controls, and indicators.

Wiring Diagram Explanation

Electrical System Functionality

Compressor Shutdown & Warning System

Details the SSAM, shutdown codes, and startup logic.

Aftercooled and Filtered Air System

Section 3: Specifications

Specifications for 300HH and 375 Caterpillar

Technical data including dimensions, pressure, and engine details for 300HH and 375 models.

Specifications for 375H and 425 Caterpillar

Technical data including dimensions, pressure, and engine details for 375H and 425 models.

Compressor Lubrication Guide

Section 4: General

Purpose and Function of Controls

Startup and Shutdown Procedures

Step-by-step procedures for initial startup, shutdown, and restarting the compressor.

Section 5: Maintenance

Daily Maintenance Checks

Maintenance After Initial 50 Hours

Maintenance Every 50 Hours

Maintenance Every 1500 Hours

Part Replacement and Adjustment Procedures

Procedures for replacing compressor parts and making adjustments.

Separator Element Replacement

Setting Speed and Pressure Controls

Troubleshooting Guide

Chart for diagnosing and resolving engine and compressor operational issues.

Section 7: Illustrations and Parts List

Procedure for Ordering Parts

Recommended Spare Parts List

Engine, Compressor, and Parts Breakdown

Illustrated breakdown of engine and compressor components with part numbers.

Radiator and Compressor Fluid Cooling System

Air Inlet System and Exhaust System

Control and Discharge Parts (375 and 425)

Regulator/Blowdown Valve (375 and 425)

Regulator/Blowdown Valve (300HH and 375H)

Optional Aftercooler/Filter and Parts

Electrical Parts

Instrument Panel and Parts

Fuel Tank and Connections

Frame, Axle, and Parts Assembly

Canopy, Acoustical Panels, and Parts

Decal Locations on Unit

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