1020 Manual Destroker

miller873

New User
I have a 1966 1020 JD gas that sometimes is very hard to crank and won't start when hot. I have installed a manual destroker which takes care of the problem but hydraulic fuel leaks out of the destroker when it is screwed in and tractor starts. Does not leak when screwed out. Any thoughts on this would be appreciated.
 

Normal. The metal to metal threads won't hold back 2250psi. De-stroker has to be cranked onto it's " backstop" in order to seal.
 

I've never encounter you problem but I think replacing o-ring(parts key 3) might solve your leak. At least it worth an attempt
R30903 O-Ring - PACKING,O RING ADD 1.00 USD

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Use a proper destroker. These rockshaft droppers and steering wheel wigglers are a daft looking bunch of goofs. Pump still drags the starter some unless destroked.
 
Better yet, fix the internal leak that is causing the drag. Takes a little testing to locate it but it's robbing power all the time.
 
/Would a gear reduction starter fix the problem. I know it must have an internal leak but I am not qualified to find it and don't want to spend a lot of money on it. Just want to be able to crank it when it's hot.
 

That would be treating the symptom instead of correcting the cause.
What is the voltage across the starter while cranking, battery post to starter casting ? Could be low voltage ?
Then again in over 15 years of asking this question. Only one person ever did measure and he would only measure when the starter was not cranking.
Could be battery, cables, connections or starter.
What is the ignition timing while cranking? Not uncommon for the advance to be stuck or somebody has "timed by ear".
 
Will check it when I get back home in about 2 weeks. Battery is new, cables and all wiring new, starter is new. This is a restore project. I do know that if I crank it when there is pump pressure the insulation on the battery cable where it connects to the starter solenoid will start smoking very quickly. The ignition timing is on the mark. Starts fine when cold. Starts fine when hot after screwing in de-stroker. Hydraulics work fine for my use, don't want to spend a fortune on this old tractor. Would rather not have the mess of hydraulic fluid running out every time I use the de-stroker. Thanks for your input.
 
Just out of curiosity did you use automotive cables? Sounds like they are way too small. You need to get the smoking cable fixed. Heavy cables, a good ground (preferably attached to the starter) and a starter that isn't dragging shoulden't need a destroker after it warms up.
 
(quoted from post at 11:08:53 04/26/16)
a starter that isn't dragging shoulden't need a destroker after it warms up.

Re-starting a JD tractor with CC hyd system that has been operated is where utilizing a destroking screw is very important or in very cold weather conditions
 
(quoted from post at 10:00:03 04/26/16) Will check it when I get back home in about 2 weeks. Battery is new, cables and all wiring new, starter is new. This is a restore project. I do know that if I crank it when there is pump pressure the insulation on the battery cable where it connects to the starter solenoid will start smoking very quickly. The ignition timing is on the mark. Starts fine when cold. Starts fine when hot after screwing in de-stroker. Hydraulics work fine for my use, don't want to spend a fortune on this old tractor. Would rather not have the mess of hydraulic fluid running out every time I use the de-stroker. Thanks for your input.

Huge clue there. No matter how much cranking is done. The cables and connections should never be more than "warm" to the touch. That cable or connection is a dud for certain.
 
Thinking about your response and want to make it more clear. The starter is cranking very slow due to the pressure from the hydraulic pump and I think that is why to battery cable is getting hot.
 
(quoted from post at 22:57:16 04/26/16) Thinking about your response and want to make it more clear. The starter is cranking very slow due to the pressure from the hydraulic pump and I think that is why to battery cable is getting hot.

Not battery cable or connection should ever become to hot to hang onto , even if a 30 second session has occurred.
Put a multi-meter on there and measure the VD on that cable and connection.
 

miller873
Since battery cables are being discussed I'd recommend relocating negative battery cable connection from battery box attachment to starter bolt or engine block location.
 

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