Campbell Hausfeld HL550100 cutting out before reaching maximum pressure

by Bryce
(Calgary Alberta, Canada)

My compressor, a Campbell Hausfeld 8 gallon (Model HL550100) stops running before it reaches a maximum pressure.

I have replaced the pressure switch and set the dual cut in / out pressures accordingly. I am confident that cutting out of the compressor is not due to the unloader valve tripping the pressure switch as I could see that occurring with the pressure switch I replaced.

The compressor has been drained of any moisture so I know that is not a limiting factor.

The compressor will reach the maximum pressure of 125 PSI if I wait prolonged periods of time and turn it from the off position to the auto position (on/off method). This on / off method may be expedited if I move the piston by rotating the fan (in either direction). The number of times I need to rotate the fan changes once the engine gets hot. After a period of consistent fan turns to generate restart the engine, the method becomes unreliable and the run time of the compressor shortens to the point it marginally builds pressure. Presumably this is due to the engine being too warm.

Once the engine has reached the point of fan rotation no longer being effective at restarting the compressor, the only way that I am able to get the compressor to run is by loosening off the valve on the tee shaped exhaust fitting. This part is called an "easy start valve assembly (part number HL010900AV)." However once the "the easy start valve assembly" is removed or loosened off enough to get the engine running again no more pressure is built up in the compressor.

The Campbell Hausfeld description of this easy start valve reads: "Poor performance, or does air leak out of the intake air filter while the unit is running? This is probably the problem. Damaged/sticking valves is a common issue when you have low compression, and can also cause the motor/engine to stall and too much pressure in the pump’s crankcase. Be sure to clean the head and cylinder very well so as to remove all of the old gasket material and build-up (carbon and rust) when re-installing."

It would appear to me that too much pressure is building up in the crankcase and as a result the motor is stalling. That to me would suggest that my manually turning the fan releases the pressure in the crankcase and allow the engine to run again.

Please tell me if this makes sense to you as I do not want to keep tracking down replacement parts and fix things that were not a problem in the first place.

Many thanks for any help you are able to provide.

Comments for Campbell Hausfeld HL550100 cutting out before reaching maximum pressure

Click here to add your own comments

Sep 25, 2017
Stalling or overheating or?
by: Doug in s.d.ca.

\\I'm going to answer/ask inline here.

Model HL550100) stops running before it reaches a maximum pressure.
\\OK, this is from a cold start?


Replaced the pressure switch - and am confident that cutting out of the compressor is not due to the unloader valve tripping the pressure switch.
\\Normally, the pressure switch operates the unloader, not the other way.

The compressor has been drained of any moisture.
\\Never is - just the pressure - excess moisture causes short cycle but not failure.

... presumably this is due to the engine being too warm.
\\Check normal parameters.

...however once the "the easy start valve assembly" is removed or loosened off enough to get the engine running again no more pressure is built up in the compressor.
\\This is essentially unloading the pump completely - no surprise.

The Campbell Hausfeld description of this easy start valve reads: "Poor performance etc..."
\\I believe this was intended to refer to rings, rather than the valve. IOW, it's in the wrong place.

It would appear to me that too much pressure is building up in the crankcase...
\\Maybe, but normally there is a vent for relieving case pressure. You could verify this by removing the oil fill plug and stuffing a bit of paper or cloth over the hole - does anything change? Does the stuff get blown out of the fill hole?

Please tell me if this makes sense to you as I do not want to keep tracking down replacement parts and fix things that were not a problem in the first place.
\\Good plan.

Many thanks for any help you are able to provide.
\\Sure. This sounds more like low power supply voltage, which causes the motor to draw high current, and tend to overheat. It often causes the supply circuit breaker to blow, too, but not if the motor cuts out first.

If you're running it on an extension cord, try removing that. Verify the voltage at the pressure switch, running and when it's stopped (BE CAREFUL, please).

Finally, if you just let it sit after it stops, 1, does the tank pressure hold, and 2, does it restart or try to restart by itself? Check this after the first time it stops, which I hope will be below cut-in pressure. If it stops below cut-in, drain some air until it is, then wait to see what it does.

Lets us know what you find and we'll go from there.

Click here to add your own comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Campbell Hausfeld Compressor Issues.