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Case Tractors Discussion Forum
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Case 500 diesel pump what am I doing wrong

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strassfarms

11-14-2003 15:24:07




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I have a Case 500 diesel. It has an american bosch pump on it. This tractor was the second one in a paired up system. My problem is that the pump is turning and I have got it bled through the three filters and I have pressure on the return. I cannot get any fuel and the injectors. But this tractor also does not have a turn off swith either. I am not sure how you kill it. I thought maybe decompression or with the lever. Is my pump bad or is there something small that I am overlooking. I have not found any kind of lever on the pump to shut off other than the throttle. Any help would be appreciated before I think about going and spending big money on the pump. THanks Mike

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john

11-17-2003 18:37:12




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 Re: Case 500 diesel pump what am I doing wrong in reply to strassfarms, 11-14-2003 15:24:07  
My 500 shuts off with the cable (looks like a choke cable) hooked to the plunger.



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JCmarleau

11-17-2003 17:50:54




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 Re: Case 500 diesel pump what am I doing wrong in reply to strassfarms, 11-14-2003 15:24:07  
If you ever need a parts manual for your 500 my e mail is [email protected]



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Kelly MT

11-15-2003 06:00:25




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 Re: Case 500 diesel pump what am I doing wrong in reply to strassfarms, 11-14-2003 15:24:07  
My 500 has a cable shut off. When I first got my 500 I had a similar problem. The shut off cable was in but no fuel. I had to pull the side cover and found the linkage was gummed up and stuck in the shut down position. PK



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caseman-d

11-14-2003 20:41:15




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 Re: Case 500 diesel pump what am I doing wrong in reply to strassfarms, 11-14-2003 15:24:07  
I always thought the 500 shut off with the throttle pushed ahead, sounds like there were 2 options. I have the same problem with one of my 900's. The pump does have a lift pump, as with mine it had fuel there put we put pressure to the tank and it finally took. I think also part of my problem was that lever was sticking and not letting fuel in. Try working ir back and forth. Once you get it smoking you know you have fuel. They can be a bear to prime them. good luck and let us know what you find out. I also heardabout the spring and ball before, I would like more info on that guys.
caseman-d

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Milky2390

11-14-2003 16:05:26




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 Re: Case 500 diesel pump what am I doing wrong in reply to strassfarms, 11-14-2003 15:24:07  
Just to clarify is this the bosch psb rotory pump?
My 600 has a psb from a 500 power unit that I just had the head rebuilt. It took a while to get fuel to the injectors. We cracked all of the injectors and opened the decompressor and cranked the motor.It took a little while to ge tfuel to all the injectors. If you are getting fuel from the return on the head make sure the orfice is in place in the fitting that threads into return side of the head.(orfice with a ball and spring behind it.) If the fitting is threadded into the head too tightly the tapered threads can compress the outer fitting and make it difficult to remove the orfice with out destroying it. On the 600 you just close the throtle all the way for fuel shut off. According to my I&T manual the 500 had a fuel shutoff plunger at the rear of the timing cover. (just below the head on the right side.) "The plunger should move all the way out to stop the engine and the spring must return the plunger all the way in when the stop contol is released." ,Joel

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John Saeli

11-14-2003 15:41:26




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 Re: Case 500 diesel pump what am I doing wrong in reply to strassfarms, 11-14-2003 15:24:07  
Hey Mike; The fuel turns on & off with the throttle lever. You shouldn't have to do this, theoretically, but in the past I have had to crack all the injector lines to purge air out of them. Good luck



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500CASE

11-14-2003 16:22:51




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 Re: Re: Case 500 diesel pump what am I doing wrong in reply to John Saeli, 11-14-2003 15:41:26  
My two 500's have a cable to shut off the fuel. The throtle style shut offs came later I thought?



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Jerry

11-14-2003 15:41:10




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 Re: Case 500 diesel pump what am I doing wrong in reply to strassfarms, 11-14-2003 15:24:07  
Make Sure that you have the throttle opened up as this allows fuel to flow from the pump.



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John Saeli

11-14-2003 15:40:47




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 Re: Case 500 diesel pump what am I doing wrong in reply to strassfarms, 11-14-2003 15:24:07  
Hey Mike; The fuel turns on & off with the throttle lever. You shouldn't have to do this theoretically, but in the past I have had to crack all the injector lines to purge air out of them. Good luck



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