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My John Deere LT150 will not start, it cranks over and backfires, and is blowing gas out of the exhaust. I changed the spark plug since it was flooded out, and the spark is good. I thought it could be a something to do with the cut out switch in the seat, but that seems good also. This tractor is maybe 8 years old and is taken care of, not left out is the weather.

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You are having a carburetor problem. Try this first on the carburetor there is an idle screw turn it counter clockwise to reduce gas flow. If this fails there is a bowl at the bottom of it remove it. Inside there is a float that regulates the gas flow. Check and make sure that there isn't trash or anything that could affect the flow of gas in it. If this doesn't work you will have to replace it.

Posted on Sep 25, 2014

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Same for me . Checked everything to no avail but then I found a sheared key in the flywheel. Replaced and all good! Was affecting timing.

Posted on Sep 25, 2014

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6 Suggested Answers

6ya6ya
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SOURCE: John Deere 115 lawn tractor - won't start.

I have a 115 john deere tractor that runs but the engine will not run smooth I've put a new fuel cap on it a new pump and clean out the carb.

Posted on Aug 18, 2010

wilsodfarm
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SOURCE: 3020 carburetor ? john deere gas tractor, 3020

those carbs are real simple you will not have any problem

Posted on Jul 29, 2009

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SOURCE: I have John Deere GX345. It does not start

Look for a small silver box with 1 wire on it mounted to the motor. It is a temp sensor and will keep it from firing...Just had to replace mine...

Posted on Aug 09, 2009

bbreton
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SOURCE: need instructions for changing a drive belt on a John Deere LT155

I have googled LT155 and came upon john deere LT155 lawn tractor(noncurrent). It took me to John Deere's site. I put in your model number and it had several catagories. I would try the alphabetical list, go to B and look for traction belt.
Good day.

Posted on Oct 14, 2009

rwvanlue
  • 486 Answers

SOURCE: I have a John deere 317 tractor that does not start.

We will be testing for voltage to the points, coil, engine to tractor wiring harness, ignition switch

Tools needed:
volt meter to read 12 volts, or test light

1) with the points open: is there voltage at the connection wire at the points
If yes; adjust points to .020" and try to crank engine and check for spark
*** you may want to determine if condensor is connected to this wire also
if no
2) check point side (neg or - ) of coil for voltage
if yes, engine should start
if no
3) check for voltage at the + side of coil
If yes, coil is bad
if no
4) check wire connector from engine to frame wiring harness
if yes; engine should start

if no
5) check wiring on the back of ignition switch
if yes; engine should start

if no
6) check that ignition switch RED or BATTERY supply wire has voltage
if yes; switch is bad

if no
7) check supply wire and circuit breaker connected to the battery side of the solenoid
if yes; engine should start

if no; circuit breaker could be at fault or wire connector at battery supply

Posted on Nov 08, 2009

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Hi,
Sounds like the float is bad - what happens is the float sits just a little off and when you add the demand of more fuel it skewers the RPM by starving the engine.
Try removing the carburator and either adjusting the float by bending the tab or replace it. As part of this repair i suggest you just replace the needle and seat as well if they are over a year old.

Thanks,
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