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John Deere Tractors Discussion Forum
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70 diesel pony motor not engaging right

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bdeerehunter

03-20-2005 13:23:45




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The pony motor on my 70 diesel won"t engage right when the motor is running. If I engage it before I start the pony, it will work fine but as you can guess this process can"t be good on the electric starter. I can"t see any problems with the sliding assembly the actual gear itself looks fine as does the flywheel teeth. Any help is greatly appreciated.




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Soldier Tom

03-20-2005 16:28:03




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 Re: 70 diesel pony motor not engaging right in reply to bdeerehunter, 03-20-2005 13:23:45  
Something you may be able to do in the meantime, is put a bit of FORWARD pressure on the lever. NOT ENOUGH TO BREAK anything, but maybe that little extra will allow the pony to run up without spinning the gear in the tranny. I just assume you mean it is spinning and won"t engage cause it is. On the 720 I had to engage the gears, but not the transmission. Then fire up the pony. You see the gears were meshed, and when I put power to it they spun up ok. Of course since the rebuild all of that is only a BAD memory. For the trouble it was MOST worth putting a little attention on the tranny. I suspect you have checked to make sure you have it all adjusted right, right? Best thing we ever did was to get the service, operator, and parts manual for the 720.
~Walk in peace~
Soldier Tom

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720Deere

03-20-2005 15:43:41




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 Re: 70 diesel pony motor not engaging right in reply to bdeerehunter, 03-20-2005 13:23:45  
There is a friction disc brake in the pony transmission. The brake holds the pinion still until it is engaged. It could be worn out or you could have a leaking tranny seal that has soaked it with oil or you could need some linkage adjustment. Another problem could be that the pony clutch is too tight causing more drag than that little brake can hold. If you need to replace the friction disc, all the parts are still available from John Deere. You will need to spit the pony transmission from the engine to do the job. While you are in there you may want to replace the few bearings and seals that are in the tranny. They are not that expensive so you might as well do it while you have things apart.

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