Question about Caterpillar CAT 150 KW Natural Gas Standby Power Generator

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Natural gas generator starts but surges under load

Relocated and replaced gas regulator for same problem told by cat additional piping needed between regulator and engine. relocated 50 feet away. started and ran good but after replacing governor the problem returned.

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Install a pressure gauge at the gas inlet regualtor, conform it isn't less than specs normall 11-13" WC pressure. test this when it is surging, it sounds like fuel, or also incorrect governor gain setting

Posted on Nov 17, 2013

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Why is it surging under load?


Yep - the carb needs to be removed and cleaned out thoroughly to remove the clogging responsible for the surging. Motor needs a smooth supply of gas - look at what your car does when you jerk around with the gas pedal. Also check the governor area of generator since that keeps motor running at a certain fixed speed. If there is something wrong with it, that will also cause the problemo.

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Is this a natural gas fueled generator? Sounds like a fuel problem, i would go through the fuel system and find out whats wrong. If its a natural gas/propane unit its most likely a bad regulator or low pressure.

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You did not specify fuel. If running natural gas or propane, check the diameter of your feed line. You need at least 1/2 to 3/4 pipe diameter on the NG or propane. At 60KW I would guess at least 3/4 maybe larger for NG.

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Surging


It definately sounds like a fuel problem, lack of fuel..I assume it is running on LP or natural gas. The hose running from the demand regulator goes to the carburetor/mixer. When it gets to the carburetor, there is an adjustable main jet. It is different on different models, but is usually easy to find. There is probably a screw slot in the end of the screw head and a spring under the head. Start it up after locating the screw and open the jet just enough to even out the running. It was factory set, but barometric pressure and altitude and different fuels in different areas will decessitate different settings.
Please let me know if this fixes your problem, Robert

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THAT SOUNDS like a VERY LEAN condition. The exhause glowing is because its so lean. The stalling the sputtering. OPEN the gas valve more WHILE its running. With a load if possible.. If you have a tri fuel kit like I do, going from propane to nat gas I need to open the load block (gas valve) 2 turns more .Then it starts and runs great.

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running out of time and too rich
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The generator kicked the breaker of and was smoking and smelled like electrical


What type of load (electrical) was hooked up to this generation?? If the surge voltage and current was exceeded above the generator maximum for any length of time. There problems, it could be the regulator, insulation burnt off the windings.


I am taking a guess here. Now, 7100 Watts is it typical surge wattage. This mean that the generator will deliver 7100 Watt (voltage times current) this is know as the power factor. The actual operating load would be 6800 Watts and I would even operator the generator at its peak wattage. Something in the neighborhood of 10--15% less the peak wattage. Therefore a good positive theatrical Wattage would be 5800 to 6350 operating wattage. Then this generator would run all day.



Just remember Ohm's Law. Current plays a big factor in loading of a generator while the operation voltage is at 120 AC Volts. Example: electric motor; Now electric motor when starting will pull three time its operation current. Operating current for a 1/2 HP AC motor is 6 amperes but start this electric motor will require 18 amperes. This is one reason why they starting capacitors on smaller electric motors. Larger three phase electric motor can literal stop a generator cold...in its tracks. It put such a large demand on the generator it stops the engine powering the generator. I have seen crankshaft break because the generator could handle the heavy current load.



Remember, any time you are running a small gas powered generator. All ways figure what the load and surge current load will be before hooking up any generator. Normally this is figured in VA (volt/amps). Wish you lock. GB...stewbison

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Depends on what type of vent pipe it is. Usually a house of that age, a better vent pipe is needed. Also, tankless water heaters need a more direct path to exit exhaust then the tank water heaters. Chances are you will need to either just replace the type of pipe to one that can withstand higher heat and/or relocate the pipe exit to a more direct route outside the house.

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Do I need a part to convert my Maytag gas dryer/washer combo back from propane to Natural Gas?


Yes you can, but whether you should is another matter. I purchased a new dryer and needed it to be propane ready...you need to get the proper orifice (which lets the gas in to the burners) changed out. Natural gas orifice has a larger hole than a propane orifice. In addition, the regulator must be modified. It may involve flipping an insert under the cap (typical of stoves) or it may require conversion parts packed in the conversion kit (order one specific to your drier). This regulator is part of the piping within the back of the drier.


Incidentally, conversion orifice(s) should be included with the drier and screwed to the body in a clip. When you change it over and label the equipment as converted to propane, put the old natural gas orifice in the clip and screw it back onto the body. Put the instructions in a paper envelope and tape to the outside of the body of the drier.

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Questions about replacing electric cooktop with gas (GE JPG331)


Hi, I can get you the regulator for $66.95. The part would have to be ordered. Yes it does need the regulator. I'm sorry but there are no generic regulators for this and for the safety of your family, you do not want to cut corners if possible. Yes you will need a threaded T to connect to existing pipe. Please let me know if I can assist you further with the [art.

THanks
Vic

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