Question about John Deere Technical Service Repair Manual 316 318 420

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318 john deere no throttle control runs at high rpm only...

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Posted on Jan 02, 2017

nova2nv
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SOURCE: john deere 318 wiring diagram I replaced an bg 316

Purple wire goes to the solenoid on starter.If you installed starter with single wire post all you have to do is mount a solenoid to the frame just in front of starter,existing batt/starter cable goes to one solenoid post,purchase a short red cable and install on other solenoid post and run it to the starter,plug purple wire into new solenoid and the way you go.

Posted on Nov 16, 2009

Testimonial: "This was great advise bought a solenoid and away i go thx"

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SOURCE: John Deere 445 Garden Tractor, starts immediately,

could be bad gas, but it sounds like a choke problem. did it sit over the winter with less than a half tank of gas in it. try putting some rubbing alcohol in the fuel or draining the tank and disconnecting the gas line so you can drain the gas out of the carb. also check the gap of the spark plug and make sure that is correct. when was the last time there was fresh oil put in. also check the air filter, it could be full of dirt.

Posted on Apr 18, 2010

Testimonial: "Thanks for the ideas. I will try your suggestions. Tractor used for snow blowing during the winter and gas did not stay in it long. Good ideas!"

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SOURCE: my john deere rideing mower idles up and down at

The motor has a governor that controls its speed, and if one of the pivoting parts or linkages is sticking this would happen. Look for the throttle linkage on the engine carburetor (move your throttle up and down, watch what moves). The governor will be a second linkage attached to the throttle arm. Squirt some WD-40 on any rotating parts and make sure a foreign object isn't stuck in there. It could also be the part of the governor that's internal to the engine -- harder to get at, but not expensive to fix.

Posted on Jul 04, 2010

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SOURCE: need a electrical diagram for John Deere 318

You might want to post this question in a different section. This is the computer section...

Posted on Aug 18, 2012

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Need a electrical diagram for John Deere 318


You might want to post this question in a different section. This is the computer section...

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I have a 1988 318 John Deere garden tractor and it revs really high when i turn the throttle up and revs comes back down after a few seconds. But overall,, full throttle engine is over-revving, can only...


If your rpm's are high/sluggish and slow reacting its do to your govenor inside your engine needing to be fixed.There is a plastic housing with fingers on it that will break and allowing metal balls to free float.Another problem with them is that the washer under the retaining ring will fail or loose tolerance,also located inside engine.

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The H is for high rpm (Main mixture) and the L is for Low rpm (Idle Mixture). First turn in both screws all the way in and then turn them both out 1 and a half turns. Pump the primer bulb if the equipment has one. Start the engine, once it is idling, turn the L (Idle Mixture) screw out (counterclockwise) from the preliminary setting until the engine speed decreases (rich). Note the position of the needle. Now turn the adjusting needle in (clockwise). The engine speed may increase, then it will decrease as the needle is turned in (lean). Note the position of the needle. Set the adjusting needle midway between the rich and lean settings as in the picture below. Don't touch the throttle during this procedure. Once you have found the best idle speed for the engine then you need to adjust the high rpm. This process is the same as with the idle rpm process but you need the to hold the throttle wide open while you are adjusting the H (Main Mixture) needle on the carburetor.

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