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690C ENGINE HOPPING

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PETE

11-30-1999 16:16:08




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CAN ANYONE TELL ME HOW TO SOLVE THE PROBLEM OF THE ENGINE HOPPING. THE ENGINE HOPS AT ANY SPEED WHEN I THROTTLE UP.IT WILL STOP IF I THROTTLE DOWN TO ANY SPEED. THIS MACHINE HAS THE JD6616 ENGINE.I HEARD TRACTORS HAVE THIS SAME PROBLEM IN THE FIELD. I'VE HAD THE PUMP REBUILT. THANKS




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PETE

12-02-1999 15:11:09




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 Re: 690C ENGINE HOPPING in reply to PETE, 11-30-1999 16:16:08  
THANKS FOR THE INFO JONATHAN. I WOULD LIKE THE PART #. ALSO THE "HUNTING" OCCURS AT ANY THROTTLE POSITION EXCEPT FULL. THANKS, PETE



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Jonathan

11-30-1999 17:44:46




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 Re: 690C ENGINE HOPPING in reply to PETE, 11-30-1999 16:16:08  
hello ....should be a 466 c/i engine...with an inline Bosch pump....usually those pumps last almost forever without attention....in the yellow machines anyway... and actually if it was rebuilt to try and correct the "hunting" or whatever term you choose, too bad you didn't post this first. On the end of the pump (the end where the throttle linkage and shut off linkage is) is a locknut and adjusting screw....there is a spring on the inside of that screw...(There was a mod program I believe a long time ago to replace that spring with a stiffer one, I can look up the part number in the A.M.)...but you may want to try turning the screw in a bit to increase the spring tension...it may increase the idle speed some but won't have any ill effects....this was a very common complaint on these machines....

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