DB1210 surging RPM

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gwatts
Posts: 33
Joined: Sun Jul 15, 2018 12:47 pm
Location: Louisiana, USA

DB1210 surging RPM

Post by gwatts » Mon Feb 10, 2020 9:10 pm

I'm trying to determine where I need to focus my attention on a DB 1210. I had the injector pump rebuilt about 10 years ago. Last year I had to have the fuel tank rebuilt because the previous owner had used a "slosh" type sealer to coat the inside of the tank.The coating broke free, clogging the system from the tank to the fuel filters. I removed the tank and had it professionally rebuilt, I blew everything out and re-primed the system. To finish my work I ran the tractor the rest of the week using a makeshift fuel tank from a 5 gal bucket. :D

I've been using the tractor ever since but recently have noticed that at low RPM (1200 or less) the engine is weak and sounds like one cylinder is not hitting. If the RPM is increased to 1400 or more it sounds like the cylinder starts hitting again. As long as the RPM is up the tractor works reasonably well. However, if it is allowed to lug down it has a hard time recovering. I've been pulling a 10 foot disc and it handles it well but you can't let it lug down. The RPM surges slightly even when it's pulling OK. Driving down the road with no load you can hear the RPM changing slightly. The tractor does not smoke and has normal oil consumption.

I recently changed the lift pump and fuel filters, this resulted in no noticeable improvement. Should I start with the injector pump or would fuel injectors be more likely? I don't know if the injectors have ever been cleaned or changed.

Thanks

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ollek
Posts: 3926
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: DB1210 surging RPM

Post by ollek » Tue Feb 11, 2020 5:33 am

Have you changed the oil in the injection pump? The rack in the pump can stick if there is no or dirty oil in the pump.

gwatts
Posts: 33
Joined: Sun Jul 15, 2018 12:47 pm
Location: Louisiana, USA

Re: DB1210 surging RPM

Post by gwatts » Tue Feb 11, 2020 11:58 am

I have not serviced the oil in the injector pump. I do recall the mechanic saying that the pump had no oil in it when I brought it in to be rebuilt years ago. I'll read up on it..

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ollek
Posts: 3926
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: DB1210 surging RPM

Post by ollek » Tue Feb 11, 2020 12:04 pm

So you got the pump from the diesel shop without oil in the pump and then you fitted the pump to the tractor without filling the pump with oil to the correct level. If this is the case, then you can have some seriuous problems with the pump after it has been run dry.

gwatts
Posts: 33
Joined: Sun Jul 15, 2018 12:47 pm
Location: Louisiana, USA

Re: DB1210 surging RPM

Post by gwatts » Tue Feb 11, 2020 12:42 pm

The pump was serviced with oil when I reinstalled it but has not been looked at since. I'm 500 miles from the tractor so I'll have to check this all out next time I'm at it's location.

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ollek
Posts: 3926
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: DB1210 surging RPM

Post by ollek » Tue Feb 11, 2020 3:07 pm

The 1210 Operators Manual tells that the injection pump oil shall be changed every 125 hours of operation. In your case a I suspect that there is a mixture of water and dirty/old oil in the pump governor housing. This will lead to rusting of some of the pump parts. Try to open the bottom plug on the pump and let all the dirt out. Then fill the pump with engine oil to the correct level and start the engine. Run the engine for a couple of hours and change the oil again. With some luck, the pump will now work, keep fingers crossed.

gwatts
Posts: 33
Joined: Sun Jul 15, 2018 12:47 pm
Location: Louisiana, USA

Re: DB1210 surging RPM

Post by gwatts » Tue Feb 11, 2020 7:59 pm

That's on me. I remember the mechanic warning me to keep up with this oil and I completely forgot about it. I'll give it a try and see what happens. Regards,

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