JD 12.5lt mess - The Combine Forum
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post #1 of 114 (permalink) Old 02-22-2016, 04:26 PM Thread Starter
JPS
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JD 12.5lt mess

Our 9860 STS 2006 model combine had a water pump bearing failure.
Is this a common issue with this motor? Was or is there any update to this stupid designed water pump? Having trouble justifying the $75000 quoted by dealers for a reman engine, when if we had been told to replace pump at 3000 hrs for $700. Does other JD 12.5l engines fit?
It used to be John Deere green for go. Our current fleet of John Deere equipment is very unreliable and is costing us a small fortune in repairs and the service from John Deere....well is at best poor. If anyone has any ideas that would be greatly appreciated. Cheers

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post #2 of 114 (permalink) Old 02-22-2016, 05:12 PM
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Was talking to our service manager about this subject this year. We send 1 combine in each year for a service/inspection. (We do the 2nd combine in our shop.) 9860 + 9870.

We are only 1400ish hours on the machines. Up front, he said that JD does not have any official guidelines on replacing water pumps or fan bearings. He said that in his experience, the water pumps tend to go between 2500-3000 hours. Some earlier, some later. He has had guys change them every 1000hrs and he has had guys ignore them entirely. Fan bearings last longer, but he always recommends to do the fan bearings while doing a water pump since the labour has already been spent to get into the front of the engine area.

In the end, we decided that when we pass the 2000hr mark, we will change them.

Our JD9400 4WD with 12.5L had a water pump replaced around 3600hrs. We caught it just as it went - got lucky!

Andrew

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post #3 of 114 (permalink) Old 02-22-2016, 05:30 PM Thread Starter
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Thanks Andrew, our dealer when first notified of combine stopping responded " highly unlikely a water pump, never had any issues" after talking to other dealers, John Deere mechanics pretty common issue with 12.5 engine.
Thanks again.
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post #4 of 114 (permalink) Old 02-22-2016, 05:41 PM
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Whats doing with the Murphys not catching this? A proper shut down system should not let engine grenade over a water pump failure. Or is it not overheating that's killing these engines?
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post #5 of 114 (permalink) Old 02-22-2016, 05:55 PM
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X2 surely these combines and tractors are killing engines on water pump seals? I mean the Lexion on low water conditions screams bloody murder, same with a overheat.

Edit: Unless this coolant ends up in the crank case??
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post #6 of 114 (permalink) Old 02-22-2016, 06:19 PM
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I feel for you JPS.
It is a well known problem, but it seems only to ALL the poor suckers who have had the failure, and to JD themselves.

The whole stinking mess screams law suit to me but no one really wins there.

Your basically screwed. Unless something in your insurance will cover it. Or maybe when the water pump failed, it caused the machine to catch on fire, wink wink.

I have heard of many engine failures in OZ due to that water pump.

Square box........
Round pizza.......
Triangle pieces....

Iam confused......


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post #7 of 114 (permalink) Old 02-22-2016, 06:32 PM
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Quote:
Originally Posted by joesixpack View Post
Edit: Unless this coolant ends up in the crank case??
From what I've read here, that's the problem.... that and all the bearings and bits of metal that fall into the crankcase
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post #8 of 114 (permalink) Old 02-22-2016, 07:06 PM Thread Starter
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Engine doesn't overheat. Doesn't get a chance to.. Bearing fails on water pump, which is positioned above timing gears, bearing falls into timing gears etc, end result cracked head cracked block, destroyed every gear on front of motor. Great design.
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post #9 of 114 (permalink) Old 02-22-2016, 07:14 PM
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Holy crap. Now I'm starting to grasp buddy's 200,000 maintenance bill on a pair - 3 STS combines.
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post #10 of 114 (permalink) Old 02-22-2016, 07:24 PM Thread Starter
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Can anyone help? Why wouldn't any 12.5lt John Deere engine fit? We have all the bolt on bits to go in combine. Dealer here craps on about serial numbers need to match etc and tractor motors won't fit, when give them all the serial numbers they come up with some other number. They don't get paid by John Deere to think outside the square and are only interested in the $75k solution. Great service John Deere - thanks.

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