My 755 JD stats hard in cold weather. The glow plugs don't stay on long enough. How can I keep them on longer? thanks, gregjo1948
 
Install a coolant heater/block heater and plug it in for an hour. My newer model 2520 has both block heater and trans heater, makes a world of difference.

or try cycling your glow plugs twice before cranking with 15-20 seconds in between. This process works well in my now well over 20 year old power stroke diesel.

This post was edited by Dan in Ohio on 01/14/2023 at 07:03 am.
 
So it comes on when you turn the key like a diesel pickup and then times out? Wire it to a push button like older tractors had.
 
These g/p only stay on a few seconds and unless I wait 30/40 seconds they won't come back on. Block heater sounds like a good idea.
 

Have you tested the glow plugs? with some systems if one or more GP's have failed the remaining ones will ''time out'' sooner.

If GP's are ''good'' and don't stay one as long as they used to, likely the GP control module is failing, AM138537 @ around $100.00.

One other thing, is the battery in good condition, a weak/low voltage battery MAY result in a change in GP control cycling.

I would NOT recommend a manual button, as GP's can overheat and blow apart if the button is held too long. And how long is ''too long'' is a guessing game!
 
(quoted from post at 13:08:54 01/14/23) These g/p only stay on a few seconds and unless I wait 30/40 seconds they won't come back on. Block heater sounds like a good idea.

Glow plug control modules on the Yanmar engined Deeres do fail over time. Just put a new one in my 332 lawn tractor. They have an ambient temp sensor built in to set the amount time that the glow plugs are energized. Have you tested the individual GP's to make sure all 3 are good?? Have you used a test light on the GP wire harness to time how long the GP's are receiving power? What ambient temp do you have when it becomes hard to start??
 
If you follow this recommendation of rewiring the plugs to a button just be careful of how long you hold it. If it has the quick heat style glow plugs they can be burnt out or even burn off and drop the tip in the cylinder, not a good day.
 
Glow plug controller often does not work on our NH. But I noticed that the glow plug light (and the glow plugs) always turn on when the key is in the actual starter position So, Ill leave the range selector in a range, and try to engage starter (it wont, but the GP light still lights) Count to ten. Release key, put range selector into neutral Start. Starts right up. Do you know if your GPs come on when starter circuit is engaged?
 
Check for power at the Remove the glow plug bus bar (the ribbon jumping from glow plug to glow plug) to see if it is even trying to pre-heat.

If the bus powers up, remove the bus and one at a time check to see if the plugs themselves are good. You may find the plugs themselves are open. Don't check them with a jumper from the battery or they soon WILL be open as others have said. Not a good day!

They're 'bout as easy to replace as spark plugs in a gas engine and just replace all if any are bad. If one or two are bad, the third is not far behind.

I've worked on two of those tractors and one had dead plugs, the other a bad controller. After chasing the bugs out they both started right up in single digit temps.
 

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