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720 stuck

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green joe

12-22-2002 04:26:38




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how do you unstick a 720g?




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G Taylor

12-22-2002 20:57:35




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 Re: 720 stuck in reply to green joe, 12-22-2002 04:26:38  
The tractor likely quit completely or was on it's last leggs then was parked. Then it siezed tight with time/moisture. Or maybe it siezed to a halt and was parked? Safest to take it apart and find what went/was/is wrong.



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John T

12-22-2002 09:57:15




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 Re: 720 stuck in reply to green joe, 12-22-2002 04:26:38  
Joe, one way (often its the rings stuck to cylinder walls) is to remove the spark plugs and fill the cylinder cavities with diesel fuel with some brake fluid and a litle automatic transmission fluid added and let her soak through and refill on and off a few days and then remove the valve cover and rocker arm assembly in case some valves might be stuck, and then have the crankcase flushed and oil added and try and rock her over back and forth to see if anything happens. If the stick is not in the rod or main bearings and you get the pistons freed up (ie rings were stuck), then see if you can get the valves to move up and down in their guides (if the valves are stuck but you get the crank and cam to turn and havent removed the rocker arm assembly, you will bend pushrods), and if so flush all the diesel out and get some clean oil in her and go from there. If the rod or main bearings are froze up or the valves in their guides, this method which is primarily for stuck rings isnt gonna cut the mustard. Also, if the pistons are like welded stuck to the cylinder walls, then youre gonna have to remove the head and block with the pistons in place (disconnected from crank) and proceed from there. The problem is, if the pistons are stuck real bad, the cylinder walls may need re bore or at least honed, and even if it only seems minor like light piston ring to wall stick, then the rings are likely carboned or siezed up in which case they cant compress within the piston ring grooves as they are supposed to and she may become an oil burner. Good Luck and let us all know how you come out. Ol John T Nordhoff

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Clooney

12-22-2002 07:32:53




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 Re: 720 stuck in reply to green joe, 12-22-2002 04:26:38  
Joe, personally I unstick all tractors [including the 720] the same way. I pull the cylinder head & crankcase cover & look for what's stuck. In most cases that also involves pulling the cylinder block. My belief is, if it's stuck, whatever is sticking it should be repaired before turning the engine over to avoid other damage.



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gene

12-22-2002 10:02:47




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 Re: Re: 720 stuck in reply to Clooney, 12-22-2002 07:32:53  
get you a good press. i personnally have blown up my 40 ton twice pushing pistons out of blocks. but it is the only way some times.
johndeeregene



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Clooney

12-22-2002 13:48:28




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 Re: Re: Re: 720 stuck in reply to gene, 12-22-2002 10:02:47  
Gene, I haven't used a press to pull stuck pistons in years . I just set the block up right on some wood blocks & burn some diesel fuel in the cylinders above the pistons [sometimes it takes a couple of burns to get them free] then they usually come out pretty easy with block of wood & a hammer. I have found it does much less damage than a press.



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