Question about Dewalt D55275 8 Hp Gas - Powered 17 - Gallon Wheeled Portable Compressor

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Honda engine shuts off instead of unloading & going to idle, when compressor reaches operating pressure.

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Check oil level has auto shut off if low.

Posted on Mar 28, 2011

  • mchill482 Mar 28, 2011

    Not the engine problem. Its the shutoff system on the compressor.

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When max pressure reached engine dies instead of idle down


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You need to check the head unloader.
Compressed air that is trapped over the piston when the compressor shuts off will be evacuated to atmosphere through the unloader valve, to prevent that compressed air pressure from adding load to the start up of the compressor motor, when the pressure switch again calls for air. For example, the last time you did a sit-up, you may have folded your arms over your chest, or if you are particularly masochistic : - ) , even held a weight to your chest. What you were doing is increasing the load against which your muscles have to work to effect the sit up.
Compressed air, captured in the cylinder after the compressor shuts off, would increase the load against which the electric motor would have to work. It may increase the load too much, and the motor may fail to start, or it may pull too many amps and fry a fuse or pop a breaker in the panel.
When the compressor shuts off, the unloader valve operates, it unloads the trapped air to atmosphere, and that problem is solved.
The unloader valve is plumbed somewhere in the line between the compressor and the compressor tank.
It is often part of the pressure switch assembly. It will, in many cases, be opened by the pressure switch, when the air in the compressor air tank reaches the set point and the pressure switch trips the power supply to the motor off, and at the same time, trips the unloader valve to open.

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1_4_2012_7_59_34_pm.jpg

Jan 04, 2012 | Air Tools & Compressors

1 Answer

Compressor builds correct pressure but will trip rest before it can restart.


You need to check the head unloader.
Compressed air that is trapped over the piston when the compressor shuts off will be evacuated to atmosphere through the unloader valve, to prevent that compressed air pressure from adding load to the start up of the compressor motor, when the pressure switch again calls for air. For example, the last time you did a sit-up, you may have folded your arms over your chest, or if you are particularly masochistic : - ) , even held a weight to your chest. What you were doing is increasing the load against which your muscles have to work to effect the sit up.
Compressed air, captured in the cylinder after the compressor shuts off, would increase the load against which the electric motor would have to work. It may increase the load too much, and the motor may fail to start, or it may pull too many amps and fry a fuse or pop a breaker in the panel.
When the compressor shuts off, the unloader valve operates, it unloads the trapped air to atmosphere, and that problem is solved.
The unloader valve is plumbed somewhere in the line between the compressor and the compressor tank.
It is often part of the pressure switch assembly. It will, in many cases, be opened by the pressure switch, when the air in the compressor air tank reaches the set point and the pressure switch trips the power supply to the motor off, and at the same time, trips the unloader valve to open.

it is normaly on the bottom of the pressure switch it will have a small tube hooked to i

1_4_2012_8_01_50_pm.jpg

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1 Answer

Compressor won't restart when pressure gets low. How do I fix it?


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1 Answer

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1 Answer

Ingersoll rand air compressor 185


How old is the compressor ? This trouble shooting is directed to the vane and screw types of air compressors.

Caution,
For exact information on the equipment you are working on, go to the manufacturer’s maintenance and repair manual.

Here are some possibilities.

Compressor does not reach design pressure or capacity:
Air Pressure safety valve is leaking
Receiver air valve is open
Unloader valve is leaking
Loose Piping or fittings

Compressor will not load or unload:
Unloader valve defective
Air control valve is sticking or dirty
Unloader pressure is improperly set too high or too low
Water in the control lines
Plugged control lines

The air compressor CFPM is low:
Dirty air compressor air filter
Defective air intake control valve
High idle on power source improperly set
Damaged or worn rotor blades

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