DB885 Starting Difficulties

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PoppyShan885
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Location: Southern Indiana, USA

DB885 Starting Difficulties

Post by PoppyShan885 » Sun Nov 25, 2018 10:57 am

Can someone diagnose this?

https://youtu.be/Y5pnxOS8vzU

Video is titled "Starting Problems"


A little background. I have NEVER had a problem starting this tractor from the day I got it.

Here's what happened when the problem started. Thanksgiving night I was unloading a gun safe from the back of my pickup. I had the Brown backed up to the truck with a platform on the back to load the safe onto. The tractor was idling for approximately 20-30 minutes as I had to retrieve a rope from the barn to pull the safe to the rear of the tailgate. As I began to move forward, the engine began to race, revving up to approx 1800 rpm, but then it settled again to idle, 750rpm. I put the tractor in reverse to back to my house door and it revved again, for about 4-5 seconds, then settled again. I backed the tractor to the door and shut it off. I was unloading/moving the safe into the house for about 20 minutes. I returned to the tractor, tried to start it, and it did what you see in the video. I finaggled w/ it for about 10 minutes and it eventually started. I parked it in the barn until today.

This evening, I noticed when starting it, the tractor was a little more hesitant than usual. It started on the first turn but it wasn't as quick as normal. I attached my hay spear, drove to the hay barn, got a round bale, removed twine and parked the tractor back into my barn. All this took maybe 30 minutes. Nothing unusual happened with the tractor. I thought I'd try to restart it to see if everything was OK. It wasn't, the video is from this evening. I walked away for about 5 minutes, went back and it started. Turned it off and it went back to this. I did get it started a second time after 10 minutes or so. Shut it down and this again. I did notice a few times that the tractor seemed to "burp", nothing big, just a short, almost grunting sound.

I don't believe it to be electrical, as I can continue to turn the key and it attempts to start for what has been a couple of 10 minute sessions now. It almost as if there's something keeping the engine from turning over. I can feel the crankshaft turn over then stop abruptly, like it feels as if it gets stuck.

Thanks for any help.

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ollek
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Re: DB885 Starting Difficulties

Post by ollek » Sun Nov 25, 2018 1:00 pm

The #knocking" noise you can hear watching the video is because the voltage to the solenoid is dropping and the starter motor is cutting in and out. Check the battery and all cable connections between the battery and the starter motor.

philedge
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Location: Chester UK

Re: DB885 Starting Difficulties

Post by philedge » Sun Nov 25, 2018 2:31 pm

The dash lights going off also suggest a duff battery or a bad connection somewhere. Put a voltmeter across the battery posts whilst someone trys to start the tractor. If the voltage drops very low youve got a duff battery. If the voltage remains at or near 12 volts youve got a bad connection.
'66 880 Selectamatic rat.

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ollek
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Re: DB885 Starting Difficulties

Post by ollek » Sun Nov 25, 2018 6:03 pm

Regarding the engine race. Are you sure that your foot have not touched the foot throttle or a loose bottle or can have rolled onto the throttle pedal?

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PoppyShan885
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Location: Southern Indiana, USA

Re: DB885 Starting Difficulties

Post by PoppyShan885 » Sun Nov 25, 2018 8:42 pm

So, here's where I am today. I pulled the battery this morning, cleaned the terminals and cable ends. I hooked the battery to a charger and it was pulling 4 amps. I thought this to be high for a "charged" battery. I placed it back into the tractor and hooked the jumper cables up to it and my truck. Tractor started immediately! I unhooked the cables, started the tractor again, same as w/ it hooked up. Waited a couple minutes, it wouldn't start. Started it with the cables again and drove it to the neighbor's. He put his battery tester on it and says the battery is good. I turned it off and started it while I was there. Drove it home, after idling while checking, it revved again, pulled it in the barn and voila, no start again. Did find a loose wire on the solenoid, reattached it, same thing.

Could it be the solenoid or starter? I was hoping the battery, after it started while being jumped.

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bedwards1966
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Re: DB885 Starting Difficulties

Post by bedwards1966 » Sun Nov 25, 2018 8:59 pm

It sounds like the battery to me.

When you say you had a neighbor test it, there are different methods of testing and a battery that has just been charged (either from a charger or from a running vehicle, such as when driving it to the neighbor) can give false results so is not to be relied on.

Also, it is possible (but rare) for battery to work intermittently, work and test good one day then not work again.


It sounds to me like the engine revving by itself is a completely separate issue, perhaps air getting pulled into the fuel.

philedge
Posts: 235
Joined: Sun Dec 03, 2006 11:27 am
Location: Chester UK

Re: DB885 Starting Difficulties

Post by philedge » Sun Nov 25, 2018 9:02 pm

If youve still got the same symptoms of the solenoid chattering and the dash lights going out, youve got a duff battery or possibly a bad connection. Not all battery testers pick up all faults as Ive had an intermittent flat battery in the past where one garage with a fancy digital tester said the battery was OK but when tested by a battery specialist with a Yuasa tester it came up faulty. New battery and the problem was fixed.

As yours is starting when jumped, Id go for the battery. Can you borrow one to prove it before shelling out on a new one?
'66 880 Selectamatic rat.

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Lofty
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Re: DB885 Starting Difficulties

Post by Lofty » Sun Nov 25, 2018 9:04 pm

Could an intermittent air leak cause both symptoms?

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bedwards1966
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Re: DB885 Starting Difficulties

Post by bedwards1966 » Sun Nov 25, 2018 9:23 pm

Lofty wrote:
Sun Nov 25, 2018 9:04 pm
Could an intermittent air leak cause both symptoms?
No, the battery is there for starting the engine and has no effect on how it runs - it can even be disconnected after starting and the engine would run all day without it quite happily.

tomryall
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Location: canada

Re: DB885 Starting Difficulties

Post by tomryall » Sun Nov 25, 2018 10:59 pm

Is your 885 gas or diesel, by the sound on the video your battery is a dud or at the very best gone flat.

jazo
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Re: DB885 Starting Difficulties

Post by jazo » Mon Nov 26, 2018 1:34 am

Have you cleaned the other ends of the battery cables ? Also check the earth as some earth to the air filter frame then to chassis
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PoppyShan885
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Re: DB885 Starting Difficulties

Post by PoppyShan885 » Mon Nov 26, 2018 2:14 am

OK, I'm pretty sure I have the starting problem solved. I've had the battery on a charger all day. Just went to the barn and the tractor started without a hiccup. That tells me it's the battery.

Now, to figure out this revving thing. It's almost as if the tractor is "loading up" on fuel when @ idle. It sometimes "clatters" when you accelerate after idle, as when your connecting an implement to the 3-pt. It's revved (3) times on me now and it scares the hell out of me every time!!

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cobbadog
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Re: DB885 Starting Difficulties

Post by cobbadog » Mon Nov 26, 2018 3:31 am

Another give away for the battery problem was your amp meter was showing full discharge when you attempted to start up which usually tells you a dead cell is in there.
Not too sure about the revving issue but does sound like an air leak.

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ollek
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Re: DB885 Starting Difficulties

Post by ollek » Mon Nov 26, 2018 9:43 am

If the tractor has an diesel engine, then on possibility is that the metering valve plunger in the injection pump is sticking, and the engine can surge because of this. The reason for this is in most cases neglected service of the fuel filters and the fuel tank and water getting into the injection pump. Air ingress into the fuel system in a diesel engine will lead to engine stopping, not surging. Just a guess as you have not answered the question if the tractor has a diesel or gas (petrol) engine.

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PoppyShan885
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Re: DB885 Starting Difficulties

Post by PoppyShan885 » Mon Nov 26, 2018 12:12 pm

ollek wrote:
Mon Nov 26, 2018 9:43 am
If the tractor has an diesel engine, then on possibility is that the metering valve plunger in the injection pump is sticking, and the engine can surge because of this. The reason for this is in most cases neglected service of the fuel filters and the fuel tank and water getting into the injection pump. Air ingress into the fuel system in a diesel engine will lead to engine stopping, not surging. Just a guess as you have not answered the question if the tractor has a diesel or gas (petrol) engine.

It has a diesel engine.

I changed the fuel filters @ 845 hours. The tractor now has 850 hrs on it. The tank is dirty, however, I didn't have this problem prior to the filter change.

So, Ollek, how do I check, and then correct, the metering valve plunger if that is the culprit?

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