DieselTalk

DieselEngineTrader's FREE Diesel Engine Forums

new topic search Categories login View John Deere Engines

CATEGORY LISTINGS > JOHN DEERE > John Deere 3125 AFM

[ REFRESH ]

Thread Title:

John Deere 3125 AFM

Created On Sunday June 14, 2009 09:56

Dungyman

Posts: 3
Joined: Jun 2009

Sunday June 14, 2009 09:56

This is an engine on a commercial fishing boat in Alaska.It has a little over 8000 hours on it.It was new in 2003.Yesterday we got in after a fishing trip and had just tied up at the cannery when an alarm from the engine guages panel went off.It was an amber lite with the alarm and after reading the engine manual we finally figured out how to get the service codes from the lcd guage. It said SPN 1569, FMI 31 this is "fuel derate" according to manual. The other code was SPN 94, FMI 18 this is " fuel supply pressure moderately low" according to manual.I use a 10 micron Racor filter as a primary filter and then whatever the John Deere filter on the engine is as far as microns.Those two filters were changed less than 500 hours ago and this last trip the fuel pressure seemed to be in the good range ( 67-71 ps) even on the way home which was only 15 hour run.Not once did the engine sound different.I will change filters and see what happens but my concern is that something else might be going on.This is the first alarm or problem on this engine ever.Im about to fish salmon for 2 months so hopefully this is a filter issue.Also does anyone have any advice about this engine as far as what the future holds in problems and what spare parts we should have on board?Thanx everyone!

Quote

Top

Bottom

JoeZ

Posts: 938
Joined: Dec 2008

Monday June 15, 2009 15:59

Sorry to say, but the fuel available these days is not what it was. We see people changing the fuel filters about twice as often as before and also we have had much more pump failure in the last few years. The JD engine seems to handle it much better than Cummins, so you have that going for you. I would change the filters and give it a full bore test run before you head out on a long trip.

-------------------------
One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.

Quote

Top

Bottom

Dungyman

Posts: 3
Joined: Jun 2009

Tuesday June 16, 2009 20:48
Thanx for reply.I changed filters and no alarm so far.Its funny,,,never had this problem before and never have gotten bad fuel from our only fuel dock.I change fuel filters religiously especially before going out into the ocean and thats why Im kinda waiting for the other shoe to drop.I hope it was that simple.

Quote

Top

Bottom

Dungyman

Posts: 3
Joined: Jun 2009

Sunday June 28, 2009 19:43

Well it wasn't that simple.I changed out the fuel pressure sensor and that didn't work.The alarm is going off again.I made my first salmon trip of the season and found out running the engine at 1400 rpm's I have lost about 9 psi +/- on fuel pressure.This is on freshly changed primary and secondary filters.Usually at 1400 rpm the pressure is 68-71 psi now it is 61.Thinking is now its the pump so another one is on the way.Will let you know.

Quote

Top

Bottom

DieselNRGY

Posts: 3
Joined: May 2010

Tuesday May 11, 2010 09:11
6125 had issues with the pressure regulating valve in the filter housing. It's located right under the pressure sender in the back. It's cheap and easier to buy a whole housing with the senders, filter, and relief valves already in it. However, I agree the fuel is the first thing to blame. It doesn't have to be text book bad to cause problems these days.

Quote

Top

Bottom

johndeere1engine

Posts: 1
Joined: May 2013

Wednesday May 15, 2013 11:57
I agree with the statement that the JD engine handles more than other engines like Cummins. It has been the best brand in my opinion. See some great diesel engine parts here

Quote

Top

Bottom

CATEGORY LISTINGS > JOHN DEERE

[ REFRESH ]

SELECT Advert_Number, Size_Type, Banner_Name, FName, LName, CompanyName FROM Advert_Imp a LEFT OUTER JOIN Seller s ON a.Company_ID = s.SellerID WHERE Show_Advert=1 AND Size_Type = 2 ORDER BY Advert_Number

SELECT Imps_Available FROM Advert_Imp WHERE Advert_Number = UPDATE Advert_Imp SET Imps_Available = #Imps_Available1# WHERE Advert_Number = SELECT Impressions FROM Advert_Imp_Trans WHERE Advert_Number = AND Month(Date)=#CurrentMonth# AND Year(Date)=#CurrentYear# UPDATE Advert_Imp_Trans SET Impressions = #Impressions1# WHERE Advert_Number = AND Month(Date)=#CurrentMonth# AND Year(Date)=#CurrentYear# INSERT INTO Advert_Imp_Trans (Advert_Number, Date, Impressions, Clicks) VALUES (#Advert_Number#, #CurrentNow#, 1, 0)

SELECT Advert_Number, Banner_Name, FName, LName, CompanyName FROM Advert_Imp a LEFT OUTER JOIN Seller s ON a.Company_ID = s.SellerID WHERE Show_Advert=1 AND Size_Type=1 ORDER BY NEWID()

Customer Testimonials

'Thanks, I appreciate your site very much. I just sold another engine here this week. I am glad to know there are people working to improve the site whenever possible. I am very happy to be of some service in that regard.'

Aaron Lewin, Thorp, USA

'We sold a Deutz 6 cylinder to a new customer in Illinois within weeks of listing! Because the customer contacted us directly from the start, the deal went very smoothly.'

Leon Weller, Diesel Power Supply Co, Texas, USA

'We're thrilled with DieselEngineTrader.com! We sold an old CAT D343 within 1 month of listing and a Cummins engine within 3 months. We were amazed - we didn't think anyone would want them in the condition they were in!'

Stephanie Vaughan, Heavy Equipment Parts, Independence, USA

DieselTalk

John Deere 3125 AFM

Customer Testimonials

Newsletter