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JD 70 or 720 diesel with pony

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pete

08-10-2001 18:56:05




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Can you explain how this tractor starts and what you do with the levers?

The 70 had one lever you toggled once the pony was started and the 720 had 2 levers? Does the pony turn the diesel engine or just heat the block and gas?




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JMcClain

08-10-2001 19:23:03




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 Re: JD 70 or 720 diesel with pony in reply to pete, 08-10-2001 18:56:05  
Pete,

The 2 handles on the 720 are as follows. the inside lever is your decompression lever for the deisel; to make it easier to roll over. The outside lever engages the pony moter clutch to the deisel flywheel to start the deisel. You pull back the decompression lever first then engage the pony moter clutch. Once the deisel is rolling over gently release the decompression lever.



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JD Ol' Timer

08-10-2001 19:19:07




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 Re: JD 70 or 720 diesel with pony in reply to pete, 08-10-2001 18:56:05  
Pete, the answer is both, it preheats the engine in colder weather and cranks the flywheel to start the motor.. the extra lever on the 720 is a decompression lever which the 70 didn't have. the other lever engages the cranking engine with the diesel engine.. this also helps build oil pressure before the engine actually starts.. you wouldn't think that little V-4 was that strong until you try to start a 720 via the pulley if the pony motor won't start; it will lug a 'G' for all it's worth! (of course it helps if you remember to use the decompression lever too!)

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G Taylor

08-10-2001 20:13:54




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 Re: Re: JD 70 or 720 diesel with pony in reply to JD Ol' Timer, 08-10-2001 19:19:07  
The good thing about the single lever start on the 70D was it forced the operator to rotate the diesel initialy without compression until the lever was returned 1/2 way. If it was adjusted correctly that is. I just cringe at shows however where pup start diesels are cranked from the word go with the fuel & compression on. I guess the operator doesn't want to conserve the pony/pup clutch & transmission. And they want to wash the lube oil off the rings & dilute the crankcase oil before starting the diesel instead of prelubing the bearings before they are loaded under compression. Pull starting will only work if you have three hands & rotate the diesel initialy without compression.

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08-10-2001 19:48:23




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 Re: Re: JD 70 or 720 diesel with pony in reply to JD Ol' Timer, 08-10-2001 19:19:07  
are you saying you can actually pull start one of those diesel tractors



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Ralph

08-10-2001 21:25:54




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 Re: Re: Re: JD 70 or 720 diesel with pony in reply to , 08-10-2001 19:48:23  
Yes. I bought a 820 a couple of years ago, in the winter. After previous purchases I wanted to hear it run. I showed up at 8 or 9 in the morning. I'm guessing it was about 10 F that morning but felt like 10 below. With 3 sets of weights and a cab on the 820 we hooked on his 60 which must have been pretty well weighted down. The wheels on the 820 took turns wanting to turn backward when under compression, while the 60 scrubbed all the stale rubber off the lugs, while under full bark in second gear. Out in the center of those big cylinders things are a bit isolated from the environment. A related fact is that you can start an 820 in the shed and not have to run for fresh air.

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