AirMan SDG125S-8B1 User Manual

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Table of Contents

Questions and Answers:

S
Stacey MurrayAug 16, 2025
What to do if the coolant temperature rise monitor lamp glows in my AirMan SDG125S-8B1?
- F
  Frederick BaileyAug 16, 2025
  If the coolant temperature rise monitor lamp glows, it could be due to several reasons. The radiator might be clogged, so try cleaning it. The thermostat or the coolant temperature switch could be faulty, in which case you should replace them. There might be a shortage of coolant, so replenish it. The fan belt may be slipping, so adjust the tension. Finally, check for any looseness or disconnection of wiring or connectors and repair them if needed.
E
emily27Aug 18, 2025
What to do if the engine oil pressure drop monitor lamp glows in my AirMan SDG125S-8B1?
- S
  Sarah RiceAug 19, 2025
  If the engine oil pressure drop monitor lamp is glowing, it could be due to several reasons. You might have an engine oil shortage, so replenish the oil. The engine oil filter could be clogged, so change it. The oil pressure switch might be malfunctioning, so replace it. Also, check for any loosened or disconnected wiring or connectors and repair them.
N
nathan71Aug 22, 2025
What to do if starter rotates but engine does not start up in AirMan SDG125S-8B1 Portable Generator?
- M
  mariapalmerAug 22, 2025
  If the starter rotates but the engine doesn't start, it could be due to a few reasons. The fuel filter or fuel pre-filter might be clogged, so disassemble, clean, and change them. You may have no diesel fuel oil, so replenish the fuel. There might be air mixing in the fuel pipings, so bleed the air.
J
Joshua DoyleAug 25, 2025
Why is my AirMan SDG125S-8B1 Portable Generator generating unstable voltage?
- J
  Jennifer EstradaAug 26, 2025
  Unstable voltage generation can be caused by several factors. Check and repair any poorly tightened terminals. A faulty AVR could also be the cause, so check and change it if necessary. Reset the function circuit protector (CP) for AVR protection.
S
Sean HolmesAug 28, 2025
What to do if my AirMan SDG125S-8B1 Portable Generator is generating too high voltage?
- A
  Amanda SimpsonAug 28, 2025
  If your generator is generating too high voltage, especially when set at the rated frequency, it could be due to a few reasons. Check and repair any loosened or disconnected wiring or connectors to the AVR. The AVR itself might be faulty, so consider checking and changing it. Also, inspect the AVR variable resistor for broken wires or poor contact; repair or change it as needed.
S
Stephanie SandersAug 31, 2025
Why AirMan SDG125S-8B1 even when operated at a rated speed, no voltage or too low voltage generated?
- K
  Kristin GreeneAug 31, 2025
  If your generator produces no voltage or too low voltage even when operated at a rated speed, several issues could be the cause. Check and replace a faulty voltmeter. Inspect and repair any poorly tightened terminals. Examine the generator's main unit for broken or short-circuited winding, and repair if needed. Check and replace a faulty AVR or silicon rectifier. Inspect and repair a faulty exciter, or any broken or short-circuited circuit to the exciter field winding. Ensure the AVR frequency selection switch is correctly set. Finally, reset the function circuit protector (CP) for AVR protection.
J
Jordan ParkerSep 3, 2025
What to do if oil fence monitor lamp glows in AirMan Portable Generator?
- M
  mrogersSep 3, 2025
  If the oil fence monitor lamp glows, it could be because the condensate (fuel, engine oil, and coolant) has accumulated in the oil fence, so drain the condensate. Alternatively, the liquid surface level detecting switch may not be functioning correctly, so check or change it.
R
roystevensonSep 6, 2025
What to do if leakage relay lamp glows in AirMan SDG125S-8B1 Portable Generator?
- J
  Jeffrey HuangSep 6, 2025
  If the leakage relay lamp glows, it indicates a leakage. Check and repair for leakage on the generator side, the load side, or the connecting cable. If none of these are the cause, the leakage relay itself may be defective, so check and repair it.
M
Melanie LoveSep 9, 2025
Why the monitor lamp for air filter clogging flickers in my AirMan SDG125S-8B1?
- D
  Danielle SilvaSep 9, 2025
  The monitor lamp for air filter clogging flickers because of air filter clogging. Clean the air filter.

AirMan SDG125S-8B1 Specifications

General

Model	SDG125S-8B1
Fuel Type	Gasoline
Starting System	Recoil Start
Engine Type	4-Stroke OHV
Rated Output	1000W
Fuel Tank Capacity	4.0 L
Noise Level	65 dBA @ 7m

Summary

1. Safety

Safety Overview and Classifications

1.1 Caution Before Operation

Essential precautions before operating the generator, including handling instructions.

Personal Safety and Work Environment

1.2 Caution During Operation

Warnings regarding electrical hazards, moving parts, and hot components during operation.

Hot Parts and Fire Prevention

Precautions against burns from hot parts and measures for fire prevention during operation.

1.3 Cautions During Inspection and Maintenance

Safety procedures for performing inspections and maintenance, including lockout/tagout.

Maintenance Task Safety

1.4 Safety Warning Labels

Identification and explanation of critical safety warning labels affixed to the machine.

3. Installation

3.1 Transporting the Unit

3.2 Conditions of Unit Installation

Requirements for unit placement, ventilation, and environmental conditions.

Unit Location and Environmental Operating Conditions

3.3 Grounding Method

Procedures for grounding the generator and its electrical system connections.

3.3.4 GFCI Receptacles

Functionality, testing, and safety of Ground Fault Circuit Interrupter receptacles.

3.4 Selecting Cable

4. Operation

4.1 Instrument Panel Overview

4.2 Protection Devices

Explanation of the various protection mechanisms integrated into the generator.

Circuit Breaker and Thermal Relay

4.2.4 AVR Circuit Protector

4.3 Connecting Load

Critical warnings and procedures for safely connecting electrical loads to the generator.

4.3.1 Three-Phase Terminal Connections

4.4 Engine Oil, Coolant, and Fuel

Essential guidance on selecting and using engine oil, coolant, and fuel types.

4.5 Pre-Start Checks

Procedures for essential checks before starting the generator, including oil and coolant levels.

Fuel Checks and Pre-Filter Drain

4.6 Unit Operation and Starting

General operation procedures and step-by-step guide for starting the generator unit.

Automatic Operation and Remote Control

Engine Start Action and Procedures

Details on the engine start sequence, troubleshooting starting issues.

4.8 Emergency Stop and 4.9 Air Bleeding

Procedures for emergency shutdown and air bleeding the fuel system.

5. Periodic Inspection/Maintenance

5.1 Important Items for Maintenance

5.2 Daily Inspection and Operation Log

5.3 Periodic Inspection List

5.4 Periodic Replacement of Parts

5.5 Maintenance: Changing Engine Oil

6. Maintenance/Adjustment

6.1 Battery Maintenance

6.2 Troubleshooting

Guide to identifying and resolving common generator problems based on symptoms and causes.

6.2.1 Engine Trouble Diagnosis

8. Specifications

8.1 Specifications (SDG100S-8B1)

8.1 Specifications (SDG125S-8B1)

8.1 Specifications (SDG150S-8B1)

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