[AT] Injection pump rebuild

[Ken Knierim]

Cecil
    A big congratulations to you!
    I'll have to pass this along to my Dad who's got an old Massey
Ferguson/Minneapolis with a dead Roosa Master injection pump on it. I've
got to work out some of the same things for an old Case 400 with a rotary
Bosch IP that needs some help. The fact you've been able to figure one out
means it's POSSIBLE. As you've noted, there are flow benches and folks
generally charge big bucks for that work.
    I've always wondered how tough it is... they had to be put together and
serviced by humans so there has to be SOME leeway. I fought the learning
curve on a Ford FMX automatic transmission many moons ago and having a
transmission wizard to ask saved my bacon.... there was that ONE nineteen
cent part that got me.

Ken in AZ


On Sun, Jul 27, 2014 at 3:31 PM, Cecil R Bearden <crbearden at copper.net>
wrote:

>
> > My JD 2270 swather was built in early to mid 70's.    I bought itabout
> > 3 months ago locally and spent a lot of time and about $1000 of parts
> > to get it back into shape.  When I bought it the PO said that the inj.
> > pump would plug with some little pieces of rubber at times and he
> > would just clean it out.  It would plug in the check valve in the top
> > cover of the Roosa Master pump.   I did not remember what this symptom
> > was at the time, but a week or so later, it came to me.  The Governor
> > drive ring in the pump  is made of 2 pieces with a rubber gasket like
> > piece that fits over some rivets on each piece to drive the governor.
> > Low Sulfur diesel and the new additives in fuel now tends to eat on
> > the rubber.  A new one made of polyethylene or ?? is the replacement.
> > I found a forum discussion about injection pumps on the tractor by net
> > forum ( I think) and got a email address for US Diesel who supplies
> > the parts.  There is a replacement governor ring that is solid, so I
> > ordered it.  A swather runs at a constant speed, so it would not need
> > a cushion between those plates.  I also ordered the seal kit and a bit
> > to remove the timing screw that is special to JD.  I put the parts up
> > and bought 2 repair manuals on the pump. one from IHC and the other
> > from ALLis.  2 days ago I started in the field and the swather cut
> > great, and traveled about 7 mph cutting 3-4 ft tall Johnson Grass,
> > clover and prairie grass mixed.  Great!!  Got to the end of a 3/8 mile
> > run and turned around to go back.  After about 250 ft, it began to run
> > down like it was out of fuel.  I worked with it for about an hour in
> > 105 deg heat.  It would run for about 45 seconds then just run down
> > until it died.  I opened up the pump and tied the shut off solenoid
> > with a wire to determine if that was the problem.  Same thing.  I made
> > a call to a diesel shop where I know the owner, and he said the
> > governor ring was shot.  He also said if I would take off the fitting
> > in the tip cover and let some fuel spill I could get it back home.  I
> > did, and got it home.
>
> I dug out my parts and searched for the manuals.  I could not find
> them.  I found a site on the internet where I could download the JD
> repair manual for the pump for $9 for the next 24hrs.  I got it and
> pulled the pump off and started working on the rebuild.  A lot of the
> parts included in the seal kit were just like a carb kit, you don't use
> all of them.  This morning I installed the pump and with a little work
> on getting the air bled, it worked great!   If I had wanted to go back
> together with the original type of governor ring, I would have only
> needed the seal kit.  $14 + shipping and the $12 bit to take out the
> timing screw.   As it turned out, I spent $85 on parts, and 5 hours on
> the overhaul, and it Works!!    Injection pumps have been such a mystery
> around here, there were never any books available and no parts.  It was
> always $500 to get one thru a shop no matter what the problem was.  I
> have a White 2-105 that has had the pump worked on 3 times because the
> top cover will leak after about 3 years.  $450 each time.  The same $14
> seal kit fits that pump........    Pump shops make those of us with the
> old equipment pay for their new test stands for the new stuff.........
> I had checked with the local pump shop here, and to rebuild this pump
> would have cost a minimum of $450 + parts.
>
> Just had to share this small victory.   I have wanted to be able to
> repair my inj pumps for years, finally it happened.
>
> Cecil in oKla
>
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