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Old 08-19-2016, 08:09 PM   #1
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Views on John Deere 6125AFM75

Hi all,

A GB52 for sale in OZ has caught my attention. Powered by JD6125AFM75 at 520 hPa with 1400 hours.

I don't know much about JD engines, so any experience anyone has had with this model it would be great to hear from you.THANKS,

H.
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Old 08-19-2016, 08:31 PM   #2
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My 80-HP JD-4045 runs like a deer, and the JD mechanic prefers working on my four cylinder rather than JD's larger engines. Perhaps it's due to easy access.

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Old 08-19-2016, 09:59 PM   #3
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Originally Posted by BrisHamish View Post
Hi all,

A GB52 for sale in OZ has caught my attention. Powered by JD6125AFM75 at 520 hPa with 1400 hours.

I don't know much about JD engines, so any experience anyone has had with this model it would be great to hear from you.THANKS,

H.
It has a great reputation. I would consider it a plus for the boat.
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Old 08-19-2016, 10:21 PM   #4
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Can`t speak for the JD engines, but as to performance I have observed a GB52 I know, with I think approx 500hp Cats, pretty much up on the plane. Paid captain, no owners, onboard. Fuel consumption?
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Old 08-19-2016, 10:53 PM   #5
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In the US, for now, JD makes all the bigger farm equipment including diesels. Many commercial boats are replacing older engines with JD in my area. A local launch service replaced 6+ twin setups with JD a couple years ago. Replaced DD 12V71s. No issues, even with hot dog captains. Wish I would have bought the 12v71s.
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Old 08-19-2016, 11:12 PM   #6
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Very happy with my JD 4045 in my boat.

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Old 08-20-2016, 12:03 AM   #7
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It's interesting reading boatdiesel.com. You almost never read about Deere engines, yet they are in a lot of boats. Maybe it's the wrong audience? But in general, I think no news is good news when it comes to marine engines. Luggers are the same way. 5,000-10,000 hrs on them is nothing.
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Old 08-20-2016, 12:09 AM   #8
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It's interesting reading boatdiesel.com. You almost never read about Deere engines, yet they are in a lot of boats.... But in general, I think no news is good news when it comes to marine engines....
Makes sense.
Integrity seem to fit JD as standard in new boats sold here,they used Steyr 3-4 years back.
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Old 08-20-2016, 02:20 AM   #9
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I have twin JD 6068TFMs and have nothing but good things to say about them and about JD in general. I know a lot of folks with either 4045s or 6068s and have never heard a bad word. The expected overhaul time for mine is 12-15,000 hours. So, 1400 is just well broken in. I also would consider the JD to be a plus factor for the GB.

Peter-the Luggers are JD blocks with Lugger add-ons. Same dependability as the JD.
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Old 08-20-2016, 05:23 AM   #10
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Thanks guys for the prompt thoughts, it's very helpful. Will let you know how it goes in due course! H.
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Old 08-20-2016, 09:16 AM   #11
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Even the Navy likes them. Yesterday I watched a JD tractor pulling RIB's out of the water.
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Old 08-20-2016, 09:34 AM   #12
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But, no matter what the engine color it comes down to prior adherence to maintenance. A few years ago I was considering a similar GB with 6125s. The very capable owners had not performed after cooler maintenance nor exhaust elbow checks - Achilles heels of any newer marine engine.

Then add in years of low hour use just sitting around in a seawater environment - not always a good sign. Long lived engines are associated with owner diligence and regular use. The 6125s started out good, but are they now is the real question.
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Old 08-20-2016, 05:36 PM   #13
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But, no matter what the engine color it comes down to prior adherence to maintenance. A few years ago I was considering a similar GB with 6125s. The very capable owners had not performed after cooler maintenance nor exhaust elbow checks - Achilles heels of any newer marine engine.

Then add in years of low hour use just sitting around in a seawater environment - not always a good sign. Long lived engines are associated with owner diligence and regular use. The 6125s started out good, but are they now is the real question.
That's certainly true with a sea water cooled aftercooler, which I see the 6125AFM75 is. My 6090AFM75 has a coolant cooled aftercooler, so not subject to the same hazards.

And I see that the 526hp model is M4 rated which is WOT for only 1 out of every 8hrs, and for expected use of 800hrs or less per year. But that's probably fine for the GB, and typical of most recreational boats. In contrast an M2 rated output for the same engine is 400hp and supports 16 out of 24hrs at WOT, and expected use of up to 3000hrs per year.
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Old 08-20-2016, 06:00 PM   #14
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Peter-the Luggers are JD blocks with Lugger add-ons. Same dependability as the JD.
Not always. Our Lugger L6108A is based on a Komatsu 6108.
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Old 08-20-2016, 08:03 PM   #15
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Conrad-interesting to know-I have a client right next to Lugger here in Seattle and know a few folks there. Always thought they were all JDs.
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Old 08-20-2016, 08:58 PM   #16
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Dashews used JD
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Old 08-20-2016, 10:12 PM   #17
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Conrad-interesting to know-I have a client right next to Lugger here in Seattle and know a few folks there. Always thought they were all JDs.
Yup, mostly, but not all.
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Old 08-21-2016, 03:29 PM   #18
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I always thought JD and lugger both used Komatsu to marinize?
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Old 08-21-2016, 11:12 PM   #19
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I always thought JD and lugger both used Komatsu to marinize?
My somewhat limited understanding is that Lugger marinized John Deeres in the smaller size range and marinized Komatsus in the larger ranges. Having said that, our 1995 Lugger/Komatsu is not that large at 350 HP/7.1 Litre.

Lugger no longer marinizes engines for propulsion use due to emission regs; I suspect that John Deere's strong push with their marinizing efforts didn't help.
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Old 08-22-2016, 12:03 AM   #20
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Not always. Our Lugger L6108A is based on a Komatsu 6108.
ANd I have heard that not all John Deeres are John Deeres. I do know they used a lot of Toyota blocks as well....and that is not a bad thing.
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