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Air compessor wont start under load it is a airking 3 hp 3ph compessor and will not start under load.

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Was it running before? what ahpened to it? Is it on 3 phase service or a converter? Does it run with no air in it? Is there a trip for 2 or 3 circuits or just one? I would suspect th epower supply first, and then check the motor to see if it is ok. If it is a converter, they are only good for x amount or hours. Check it out.

Posted on Sep 07, 2010

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What size generator do I need to run a 10 hp motor


on the plate attached to the motor you will find several important items
one is the wattage of the motor
this is the maximum wattage that the motor uses when under load
the gen set will need to be at least 30% bigger than that figure
next there will the number of phases that the motor is
it will read as 1 ph or 3ph
If it is 1ph that is a single phase motor and will ru from a single phase gen set
however if it is 3ph you will need a 3ph gen set to run the motor
As most single phase motors are limited to around 5hp I would be very sure that the motor is not 3ph
specialist advice from an accredited electrician or electrical motor shop is recommended before buying a gen set. as if you need 3ph the gen sets become expensive.

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What kind of oil do i need for a craftman 1 hp 3 gal 125 psi compressor m/ n 921 153101?..


For warm climate, use 30wt non detergent oil (lowest price $3). Med priced oil ($5), use compessor oil sold at Lowes or any major center store including Wal Mart. Compressor oil is special blend for higher temperature range (continuous use). High price oil, synthetic compressor oil works for heavy duty use under severe conditions (also sold at major lumber centers, cost about $8~18).
For lite duty, any oil that you have handy will work fine (check oil before every use). Good luck

Oct 03, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

My compressor is working but my moter having loaded & burn i change another motor the same problem is happening. please guide me. thanks


The motor will run hot/overload if wrong size or too long cord is used. Also if pressure is set too high (most set at 125 ~ 135 at shut-off). In-tank checkvalve will also have effect on motor by loading the compressor at start-up. Easy test. Run compessor till you have over 100lbs in tank then unplug from power. At this point try to turn the motor /pump by hand, it should turn rather/very easily (this test is hard to do if the motor /pump is completely enclosed, you need to be able to turn the pump even if by truning the fan blade). If it does not turn easily let all the air pressure out of tank and then try to turn by hand. If it turns easily with tank empty try one more test. Run compessor till the pressure switch turns it off. Then unplug machine and turn compessor again by hand, should be easy. If not easy then unloader / checkvalve not working. The checkvalve could be leaking air back from the tank loading the pump. Replace parts as needed.

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MY COMPESSOR GAGE SHOWS 135 PSI AND 135 ON THE OUT PUT GAGE BUT I CAN,T INFLATE MY MOTORHOME TIRES TO THE REQUIRED 110#.DO I NEED A LARGER COMPRESSOR?I CAN,T FIND ANY LEAKS.


It is possible that the compressor psi as it is running drops below the tire psi creating a standoff. You must maintain air compressor psi over 110 to fill a tire to 110psi. Add air to your tire but stop when the compressor motor starts to run. When the motor stops then continue to add air until the compressor motor starts and again stop airing up the tire. Repeat as needed.

Dec 25, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Oil capacity for craftsman air compressor circa 1978 model #106..


I have a 2hp craftsman air compessor with a two cylinder pump, Here is the info from my manual as far as oil capacitity:

Remove oil fill plug and slowly add
a compressor oil until it is even with the
top of the oil fill hole. NOTE: Do not
allow oil to be lower than 3/8"
from the top at any time. When filling
the crankcase, the oil flows very slowly
into the pump. If the oil is added too
quickly, it will overflow and appear to
be full. NOTE: Crankcase oil capacity is
approximately 16 fluid ounces.

I buy my compessor oil from Lowes in the tool department. It comes in 16oz and sells for about $3. I wouldnt worry about how many ounces it holds but rather that the oil level is to top of filler hole. Lowes also sells a synthetic oil for about $7 and is recommended for severe conditions (hot / cold / used all day). Good Luck!

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1 Answer

Compessor will start and fill tank initally .


Yes it would be a start cpacitor and yes you can still order the part from sears

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My compessor wont start.


ALWAYS USE LARGE GAUGE CORDS FOR COMPRESSORS. LOOK FOR RESET BUTTONS OR THERMAL OVERLOAD BUTTON ON MOTOR. DID IT TRIP BREAKER OR GFI OUTLET?

Feb 15, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Will a 1/3 hp compressor fire an 18 guage 5/8'-2" Finish nailer?


You compessor is ideal for a small spray gun however a pin nailer requires 80 to 100 psi and a small air storage thank to operate properly. The nailer may very well shoot a short nail into very soft wood at 30 psi, however there may not be enough pressure to push the piston back to top positon to load another nail and fire again. Good Luck

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1 Answer

Kicking overloads but not consistantly


First: Most all compessors use check valves at the tank and an unloader to allow the compressor to start without a load. Make sure that system is unloading and that check valve is not leaking causing head pressure at start. Second: Too frequent starts and stops will cause motor to overheat. Check Quincy manual for max starts per hour. enjoy

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