830 injection pump

case1939 · May 5, 2013

On our 830 high tin we have been loosing prime after setting for a spell. Tractor will start after bleeding the system and run"s good with no load. To get it running good we have to bleed the system and bleed it at the injectors. Is there a check valve that leaks off or where can it be getting air in the system from some place? When the system is bled we get no fuel out of the return lines either at the check valve at the front backside of pump or at pressure relief valve on top of first and sound stage filter"s. Does the pump have to come off for rebuild or I"m I missing some thing?

thanks" Bruce

Anonymous-0 · May 5, 2013

P.S. and no pressure at fuel gage.

Andrew from Aust. · May 5, 2013

Hi,
Sorry I have no answers to to your problem but have the same problem with a 500. Mine was starving for fuel when I began to load it up so I went through and changed the filters made sure I had good flow. Now when I leave it for a week I have to pump fuel through and at times bleed the top filter. I also don't get any fuel pressure at the gauge. I have a service manual but need to really study it. There are no obvious leaks. Any help would be great. Thanks

casecollectorsc · May 5, 2013

On the 500 I have had them shear the pin in the transfer pump and therefore be short on fuel. They will run somewhat if the tank is close to full., but are getting gravity flow only. Transfer gears are under the sort of triangle cover on the pump. fuel gets gummy after sitting a while and shears the pin.

Andrew from Aust. · May 6, 2013

Thankyou! Yes that's kind of what I figured. I've been running on gravity flow. I have filled the tank just about to the top and it runs ok but not great if I load it up too much. I have a dealer service manual but haven't had time to read right through it.
Thanks again
Andrew

mEl · May 6, 2013

Andrew,

Unless the export tractors were equipped differently the 830 should have an inline German Bosch pump, This is not at all similar to the American Bosch used on the 500 tractors which had a rotary head vs the inline configuration of the German Bosch.

There is an oring which seals the transfer pump pushrod which can fail and allow a bad transfer of fuel to the crankcase, had that once on a 2290 with the German Bosch, also known as a Robert Bosch, I believe. I would check for any restrictions to flow clear to the transfer pump, the transfer pump also contains check valves, both inlet and outlet and I have seen them badly plugged although the fuel to the transfer pump should have been through the 1st stage filter. The valves are directional and must be installed properly or fuel cannot flow.

The filter relief should be checked to assure it is closing till the transfer pump builds enough pressure to open it.

mEl

casecollectorsc · May 6, 2013

Andrew was asking about a 500 pump. CASE1939 was asking about the 830 pump. I was answering the question about the 500!!!

mEl · May 6, 2013

You are quite right, I got the names in the wrong order, My intent was not to denigrate you and your information is factual. We have seen some differences in stuff exported from domestic production and that was the point of my comment. Your info was very valuable pertaining to the pump in question.

mEl

Andrew from Aust. · May 7, 2013

Thanks to everyone! sorry if I have caused confusion! I read through each and every post on here and pick up any information I can use. When I read the bit about the 830 I thought that sounds like my problem! Anyway my 500, being an export tractor has the American Bosch APE inline pump. So the info about problems with the transfer pump (drive pins sheared etc )sounds on the money. I read the dealer manual and it just says send it to a Am Bosch service station!! I should have started a new thread!! Again thanks to everyone......it"s a great forum, great people!

cshess · May 7, 2013

Mel If Case1939 opens bleed on second stage filter
if transfer pump is working he will get a lot of
fuel also by opening final filter he should get
skuirts of fuel.Could it be the old seal around
bleed screw is bad an when tractoor calls for lot
.of fuel it may be pulling in air. I would put
little oring on small screw to be sure no leak at
screw. Also make sure no restriction between
filter an fuel tank. Also my 830 has a T HANDLE
VALVE thatneeds to be opened to bleed filters .
That needs to be closed when running. Also if you
remove pump line up scribe marks on pump before
removing so you dont need to remove hood---an find
proper place to reinstall pump

mEl · May 8, 2013

CS, my 830 is the older model and has the regulator standing up on top of the filter housing. As you stated, any air entrance would be a no no. The way flow is in that systen is, gravity thru the rear canister then through to the transfer pump then return to the filter base to the second stage then to the final stage then to the pump. The second stage and final being seperated by the transfer pump are near impossible to bleed without opening the T valve you noted. Later systems had a pressure regulator in thew valve body behind the 7/8 flat hex plug between the filters on the side.

Those are not complicated systems but a basic understanding is necessary.

The systems are pretty bulletproof but getting to that age!! Rarely does it require a replacement of the transfer pump but if there is full flow to it and the valves are clean maybe so, but I would be surprised, but have been a few times.

mEl

830 injection pump

case1939

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Andrew from Aust.

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casecollectorsc

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Andrew from Aust.

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mEl

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casecollectorsc

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