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Just changed oil on the 4200 watt Craftsman generator, motor starts and runs 2-3 minutes then automatically shuts off for no reason. Any ideas on how I can solve this problem?

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Try letting it run without anything hooked up to it. If that dossent work call crafstman and they will help you. Also u can bring it to a macanic,lawn mower shop. etc

Posted on Nov 10, 2012

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Make sure you put the correct type of oil in the crankcase for this machine

if you use the wrong type of oil ,oil level sensor float wont work and causes a shut down to protect the generator engine from damage

try draining oil and refilling with 20w/50 oil

cheers pauly46

Posted on Apr 03, 2011

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Posted on Jan 02, 2017

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Potential Motor damage


Submersable pumps pull a lot of current on start up. Up to 7 times running momentarily. This is especially true of three wire pumps. ( Ground and 2 , 110V) 4 wire pumps have a capacitor start provision ( the extra wire) and a control box that greatly reduces the starting load by shifing the phase on startup.

4200 watts should handle it how ever if you have no line losses. Excess Line losses will do exactly what has happened to you. Overheated the connections and burned up the pump.

First check what gauge wire you have going from the generator to the pump and the length of the run. Check a wire gauge calculator such as http://www.denningelectronics.com/wiregauge.htm
use at least 4 times the running load for your wats and if it is a deep well pump, more than 50 feet of head from water to spickot) then use 7 times wattage. Use 5% line loss allowable,. This will probably uncover your problem as under size wire.

The other possibility is that the breaker was going bad over time and caused the voltage drop0 that destroyed the pump.

Last item you can do, check the voltage at the generator when the pump starts, it shold not drop more than 10% on start up.

Good luck

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