AirMan SDG25S-6A7 User Manual

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INSTRUCTIONAL MANUAL

MOBILE GENERATORS

SDG25S-6A7, SDG45S-6A6,

SDG65S-6A6, SDG100S-6A6

MMD Equipment Inc.

121 High Hill Road

Swedesboro, NJ 08085

Tel: (800) 433-1382

Fax: (856) 467-5235

www.mmdequipment.com

Questions and Answers:

T
tammy28Aug 16, 2025
What to do if AirMan SDG25S-6A7 Portable Generator starter rotates but engine won't start?
- J
  John ContrerasAug 16, 2025
  If the starter rotates but the engine doesn't start, several issues could be the cause. Check for a clogged fuel filter, and if so, disassemble, clean, and change it. Also, the filter of the fuel air-bleeding electric pump might be clogged and needs changing. A malfunctioning fuel shut-off solenoid could be the issue, so check the fuse. Ensure there's diesel fuel oil and replenish if needed. Finally, air might be mixing in the fuel pipings, requiring you to bleed the air.
J
Jared OrrAug 19, 2025
Why does the engine oil pressure drop warning lamp glow on my AirMan SDG25S-6A7?
- L
  Lauren WareAug 19, 2025
  The engine oil pressure drop warning lamp may illuminate for several reasons. The engine oil level may be low, requiring you to replenish it. The engine oil filter could be clogged and needs changing. There could be an oil pressure switch malfunction that needs checking or repairing. Also, check for loosened or disconnected wiring or connectors and repair them as necessary.
A
Aaron ClarkAug 22, 2025
How to fix coolant temperature rise warning lamp on AirMan SDG25S-6A7 Portable Generator?
- S
  Scott PerryAug 22, 2025
  If the coolant temperature rise warning lamp is glowing, it could be due to several reasons. The radiator might be clogged and needs cleaning. A faulty thermostat or coolant temperature switch may need changing. Ensure there's enough coolant and replenish if there is a shortage. The fan belt may be slipping, requiring tension adjustment. Also, check for looseness or disconnection of wiring or connectors and repair them.
R
Richard WallsAug 28, 2025
What to do if AirMan Portable Generator generates too high voltage?
- C
  Candace JohnstonAug 28, 2025
  If your generator is generating too high voltage, even when the voltage regulator knob is turned, there might be a few reasons. Check for loosened or disconnected wiring or connectors to the AVR and repair them. The AVR itself could be faulty and may need to be checked or changed. Additionally, there could be a broken wire or poor contact of the AVR variable resistor, which would require repair or replacement.
S
Steven GonzalesAug 31, 2025
Why does AirMan SDG25S-6A7 Portable Generator have unstable voltage generation?
- A
  adriannewmanAug 31, 2025
  Unstable voltage generation can stem from a few potential issues. Begin by inspecting all terminals for poor tightening and correct as needed. A faulty AVR could also be the culprit, necessitating a check or replacement. Lastly, verify that the function circuit protector (CP) for AVR protection hasn't been tripped, and reset if required.
T
Timothy MclaughlinSep 3, 2025
What does it mean if the leakage warning lamp glows on AirMan SDG25S-6A7?
- S
  Shawn PetersonSep 3, 2025
  If the leakage warning lamp is glowing, it indicates a leakage issue. This could be due to leakage on the generator side, the load side, or the connecting cable. Alternatively, the leakage relay may be defective. In any case, check and repair the source of the leakage.
M
Michael LeeSep 6, 2025
How to troubleshoot a starter that won't rotate on AirMan SDG25S-6A7?
- L
  lisa96Sep 6, 2025
  If the starter does not rotate or has a low revolution speed, it may be due to a battery malfunction. Check the battery and charge or change it as needed.
A
Adrian MelendezSep 9, 2025
Why is the recharging warning lamp glowing on my AirMan SDG25S-6A7 Portable Generator?
- J
  Justin HarrisSep 9, 2025
  If the recharging warning lamp is glowing, it could indicate an alternator problem, which would need to be checked or changed. Alternatively, there might be looseness or disconnection of wiring or connectors, which should be checked and repaired.

AirMan SDG25S-6A7 Specifications

General

Model	SDG25S-6A7
Starting Watts	2500 W
Voltage	230 V
Frequency	50 Hz
Engine Type	4-stroke OHV
Engine Displacement	196 cc
Displacement	196 cc
Starting System	Recoil

Summary

Safety

Caution before Operation

Safety guidelines for machine operation, including ventilation and battery handling.

Caution during Operation

Critical warnings and precautions to follow while the generator is running.

Cautions during Inspection and Maintenance

Safety measures required during maintenance and inspection activities.

Safety Warning Labels

Identification and explanation of safety warning labels applied to the unit.

Part Names

Unit Appearance and Part Names

Identifies external components of the generator units.

Internal Components

Details the location and names of internal components for various models.

Installation

Transporting Unit

Procedures for safely transporting the generator unit, including lifting.

Place and Conditions of Unit Installation

Guidelines for selecting an appropriate installation site and environmental conditions.

Selecting Cable

Criteria for selecting appropriate cables based on current, length, and voltage drop.

Connecting Load

Instructions and warnings for connecting loads to the generator, including wiring.

Auxiliary AC Power

Information on using auxiliary AC power outlets for power supply.

The Maximum Combined Simultaneous Power Consumption

Charts showing maximum power availability from GFCI receptacles.

Grounding Method

Essential procedures for grounding the generator for safety and compliance.

Selector Valve of Fuel Pipe

Explanation of the fuel selector valve and its operation methods.

Operation

Instrument panel

Identifies and explains the function of all meters and indicators.

Protection device

Details various protection devices and warning lamps for preventing engine damage.

Check before Starting the Unit

Outlines critical checks for engine oil, coolant, fuel, and belt tension.

Unit Operation

Describes starting procedures, warm-up, and basic operation.

Stopping Procedures

Details the correct steps for safely shutting down the generator unit.

Adjustment of frequency

Explains how to adjust the engine governor for correct frequency output.

Emergency Stop

Instructions for using the emergency stop button and resetting it.

Air Bleeding

Procedure for bleeding air from the fuel system after running out of fuel.

Periodic Inspection/Maintenance

Important Items at Periodic Inspection and Maintenance or after Maintenance

Lists key precautions and requirements for inspection and maintenance tasks.

Daily Inspection and Keeping Operation Log

Details daily checks and the importance of maintaining an operation log.

Periodic Inspection List

A comprehensive list of inspection and maintenance items with frequencies.

Periodic Replacement of Parts

Lists parts recommended for periodic replacement and their part numbers.

Change Engine Oil

Provides instructions and cautions for changing engine oil, including viscosity selection.

Change Engine Oil Filter

Steps for installing and checking a new engine oil filter.

Check Insulation Resistance

Procedure for measuring insulation resistance to ensure electrical safety.

Check GFCI Receptacles

Instructions for testing the GFCI receptacles for proper operation.

How to check thermal relay

Method to check the functionality of the thermal relay.

Check and Clean Clogging of Air Filter Element

Procedure for checking and cleaning the air filter element.

Drain Fuel Tank

Steps to drain condensate from the fuel tank.

Check Condensate in Water Sedimentor

Procedure to check and drain condensate from the water sedimentor.

Check Wiring of Each Part

Guidelines for inspecting wiring for loose connections or damage.

Change Fuel Filter

Steps for replacing the fuel filter, including bleeding air.

Clean outside of Radiator and Intercooler

How to clean the radiator and intercooler fins to maintain efficiency.

Change Filter inside Electric Pump

Procedure for changing the filter inside the electric pump (SDG45S only).

Change Coolant

Instructions for changing coolant, including safety and quality guidelines.

Change Air Filter Element

Procedure for replacing the air filter element.

Check Rubber hose

Guidance on checking rubber hoses for cracks or wear and replacing them.

Maintenance/Adjustment

Maintenance of Battery

Detailed safety precautions and procedures for battery maintenance.

Charge Battery

Instructions for charging the battery using an external charger.

How to Use Booster Cable

Procedures for using booster cables to start the engine, with cautions.

Troubleshooting

Lists common symptoms, their causes, and corresponding countermeasures.

Storage of the Unit

Preparation for Long-term Storage

Steps for preparing the generator for long-term storage to maintain its condition.

Specifications

Specifications

Technical specifications for the SDG25S-6A7 model.

Outline drawing

Dimensional drawings and layout for the SDG25S-6A7 model.

Wiring Diagram

Generator Wiring Diagram

Wiring diagram for the generator unit on SDG25S-6A7.

Engine Wiring Diagram

Engine wiring diagram for SDG25S-6A7.

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