[AT] Help needed on non-antique tractor

[Stephen Offiler]

Sounds plausible.  The normal solenoid operation is to close when you
remove power, and to open when you apply power.  If the solenoid coil has a
partial short, some of the coil turns will be inactive, which does two
things (1) the magnetic field is weaker so the valve might not fully open
(2) the DC resistance will be lower and it will pull more current - and get
hot.

Steve O.



On Tue, Sep 3, 2013 at 5:52 AM, Richard Fink Sr <rfinksr at verizon.net> wrote:

> Cecil i am no engine person. But have seen problems some thing like that
> and
> it was the shut down solenoid try to shut down engine. has a short in it
> unit as bad.???????????????
>
> R Fink
> PA
>
> ----- Original Message -----
> From: "Cecil R Bearden" <crbearden at copper.net>
> To: "Antique tractor email discussion group" <at at lists.antique-tractor.com
> >
> Sent: Tuesday, September 03, 2013 8:08 AM
> Subject: Re: [AT] Help needed on non-antique tractor
>
>
> > TS100 New Holland 2 WD tractor w/ 16x16 trans cab w/air loader attached.
> > Engine starts easily and seems to rev up to full throttle ok.. When
> > slightly loaded it begins to pull down and acts as if there is no
> > governor available. Tractor has 2293 hours and uses no oil. I have
> > replaced the fuel lift pump twice in last week and replaced filters. It
> > has a Delphi inj pump installed at about 1550 hours. Tractor is serviced
> > and maintained regularly. When connected to 648 New Holland Baler, It
> > will barely go up an incline when baling. When traveling in high gear on
> > roadway, it will pull down to 1500 RPM on slight incline. Works fine for
> > about 5 minutes after starting, then begins to have no power. After
> > running about 30 minutes, I could lay my hand on the injector pump, but
> > the fuel shutoff solenoid almost burned my finger.
> >
> > The fuel pump on this tractor was replaced, not rebuilt with a new
> > Delphi pump 743 hours ago. I have kept the filters changed and the fuel
> > clean, so I cannot believe the pump needs rebuilding unless the Delphi
> > pump is a pile of crap to start with. The original pump self destructed
> > at 1550 hours, requiring a new pump.   Pump shop stated the pump had
> > been tampered with causing a bolt to beak internally.  The load is not
> > excessive as the tractor was pulling the same load fine 2 days earlier.
> > I have sealed all possible leaks around the primary filter, and find no
> > wet spots when pressurizing the tank. Is it possible that the shut off
> > solenoid is bad since it is getting hot. The shutoff solenoid is a
> > plunger at the back of the pump near the distributor head. I am about to
> > pull the tank and check the intake line in the tank, it is all that is
> > left.
> >
> > This is my only tractor left with a 1000 RPM PTO that can pull my
> > swather and also has the electronic baler monitor attached...   A cat
> > mechanic thought maybe an injector was pressurizing the return line
> > causing the fuel solenoid to get hot.  It does not seem to be missing.
> > It seems that all these problems started after I drained the fuel bowl
> > in the primary sediment bulb.  I have sealed it totally now, so should
> > not be the problem.
> >
> > Cecil in OKla
> >
> >
> >
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