AirMan PDSG750S-4B1 User Manual (English)

Questions and Answers:

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Steven HodgesAug 18, 2025
What to do if the engine oil pressure lamp goes on and engine stops in my AirMan PDSG750S-4B1?
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  Daniel MunozAug 18, 2025
  If the engine oil pressure lamp goes on and the engine of your AirMan Air Compressor stops, this could be due to several reasons. It might be caused by engine oil shortage, in which case you should replenish the oil. Other potential causes include a clogged engine oil filter (change it), a malfunctioning engine oil pump (replace it), a faulty oil pressure switch (replace it), or loosened/disconnected wiring or connectors (check and fasten them).
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Dylan JohnsonAug 21, 2025
What to do if the water temperature lamp goes on and engine stops in my AirMan PDSG750S-4B1?
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  David JonesAug 21, 2025
  If the water temperature lamp goes on and the engine stops on your AirMan Air Compressor, it could be due to several reasons. The radiator might be clogged (clean it). The coolant level could be low (replenish it). There might be belt slippage (re-adjust tension). Also, consider the possibility of a faulty thermostat (change it), loose wiring/connectors/disconnection (check and retighten), or a faulty coolant temperature switch (change it).
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Chris PughAug 23, 2025
What to do if the engine speed down lamp goes on and engine stops on my AirMan Air Compressor?
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  Melissa JohnsonAug 23, 2025
  If the engine speed down lamp goes on and the engine stops on your AirMan Air Compressor, it could be due to several reasons. You should adjust the speed if the unload revolution speed is low. Replace the filter and/or clean the gauze filter if there is a shortage of feeding fuel caused due to fuel filter and gauze filter clogging. Bleed the air if air mixed in fuel line system. Clean and/or replace air filter if power drops, owing to clogging of engine air filter. Change the controller if controller against engine speed drop is defective.
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Chad SchmidtAug 26, 2025
What to do if the discharge air temperature lamp goes on and engine stops in my AirMan PDSG750S-4B1 Air Compressor?
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  Daniel YatesAug 26, 2025
  If the discharge air temperature lamp goes on and the engine stops on your AirMan Air Compressor, it could be due to several issues. Check for a clogged oil cooler (clean it) or a clogged oil filter (change it). Ensure there's no shortage of compressor oil (replenish oil) and that the belt isn't slipping (re-adjust tension). Also, consider a malfunction of the by-pass valve (check/change), loose wiring connectors and disconnection (check and retighten), a faulty discharged air temp. switch (check/inspect), or a malfunction of the oil check valve (disassemble/check). Finally, make sure the ambient temperature is correct.
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Tammy JonesAug 27, 2025
Why doesn't the engine reach its maximum speed on my AirMan PDSG750S-4B1 Air Compressor?
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  Christina MooreAug 28, 2025
  If your AirMan Air Compressor's engine does not reach its maximum speed, several factors could be responsible. It might be due to an improper length in the speed regulator rod (re-adjust to a longer length if needed) or a faulty speed regulator (disassemble and check). A clogged fuel filter (disassemble and change) or a clogged unloader orifice (disassemble and clean) could also be the cause. If these steps don't resolve the issue, it might be an engine trouble.
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dgarrettAug 30, 2025
What to do if the discharge air pressure will not rise in my AirMan PDSG750S-4B1?
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  Gerald NguyenAug 30, 2025
  If the discharge air pressure of your AirMan Air Compressor will not rise, ensure the pressure regulator is properly adjusted (re-adjust/fasten). Check that the starting unloader valve is in the 'RUN' position. Also, verify that the manually operated relief valve is not kept open; check and re-adjust it if necessary.
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probertsSep 1, 2025
Why does the safety valve relieve at unload on my AirMan PDSG750S-4B1 Air Compressor?
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  Cindy FrazierSep 1, 2025
  If your AirMan Air Compressor's safety valve relieves at unload, it could be due to a few reasons. Check the pressure regulator adjustment and re-adjust it by loosening if necessary. Also, inspect the unloader regulator and re-adjust if needed. If the issue persists, the unloader valve may be damaged or the seat may be malfunctioning, requiring a change. A faulty safety valve may also be the cause, which would also require a change.
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Lisa JacksonSep 4, 2025
What to do if discharge pressure will not rise up to the specified one, and RPM will drop in my AirMan PDSG750S-4B1 Air Compressor?
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  Louis SweeneySep 4, 2025
  If the discharge pressure of your AirMan Air Compressor will not rise to the specified level and the RPM drops, it could be due to the pressure regulator. First, try re-adjusting the pressure regulator by fastening it. If the problem persists, the pressure regulator may be faulty and needs to be changed.
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Nathan RodriguezSep 6, 2025
Why is oil mixing in the air (poor oil separation) in my AirMan PDSG750S-4B1?
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  Kenneth NguyenSep 6, 2025
  If oil mixes with the air in your AirMan Air Compressor, leading to poor oil separation, several factors might be at play. The scavenging orifice strainer may be clogged (disassemble and clean it). Low discharge pressure could be a contributing factor (disassemble the pressure control valve and check it). Additionally, the oil separator might have deteriorated and needs to be changed.
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Melvin YoungSep 8, 2025
What to do if the starter rotates but engine does not start on my AirMan PDSG750S-4B1?
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  Stephanie ClaytonSep 8, 2025
  If the starter rotates but the engine does not start on your AirMan Air Compressor, it could be due to a fuel filter clogging (disassemble, clean, and change it) or a malfunction of the fuel cut solenoid (check the fuse).