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Tractor Talk Discussion Forum

CAT D-4 PROBLEMS

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DianeD

07-25-2007 13:09:32




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When my husband first brought this old dozer home,we were having some trouble with it.The pony motor would run but could not get the diesel engine to run.The 4 filters that were in it were very dirty.He cleaned them all out and put them back in.He finally got it running.Even pushed a little dirt with it, then parked it until the next day.He bought all new filters for it, changed them, and now it doesn't want to run.Anyone have any ideas about this? Thanks

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JTinNJ

07-26-2007 03:59:12




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 Re: CAT D-4 PROBLEMS in reply to DianeD, 07-25-2007 13:09:32  
A word of caution.I learned this the hard way. I let my dozer run out of fuel. I had to bleed the injection lines. It was an easy job to do standing on the tracks. I hit the started while standing on the track,and,it started. I had left it in gear and it started moveing.Not the brightest thing to do,but,I did it.I feel very lucky that I was not hurt or killed.A well learned lesson from a mistake I will not make again.

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NC Wayne

07-25-2007 19:03:25




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 Re: CAT D-4 PROBLEMS in reply to DianeD, 07-25-2007 13:09:32  
On most of the CAT dozers the fuel tank is the highest point in the system. As a result you usually have to close the valve on the bottom of the tank to change them without losing alot of fuel. So, first thing, make sure he remembered to open the valve if he closed it. Depending on the type of valve, even if it was reopened and looks like it externally that doesn't necessarily mean the valve actually opened internally. Pull the line downstream of the valve and make sure there is fuel there. If all that is good then move on to the filters. After the filters are changed you need bleed off the air left in the filter housing/s. Many of the older machines came from the factory with a small valve on the filter housing for this purpose but over the years the valves got broke, became inoperable, or for whatever reason simply got taken off and replaced with a plug. So, first thing to do is check the filter housings and find the bleed point and open it til you see fuel appear in a steady stream. Now since he's tried to start it with no fuel in the housing he's probably gonna need to bleed the injector lines. To do this simply break them loose at the injectors and loosen them a couple of turns...don't remove them all the way. Now, making sure the fuel lever is in the run position crank the engine over til you see fuel start coming out of the lines at the injectors. As fuel starts to appear tighten the lines. As a couple of lines get fuel up to them and are tightened it may go ahead and try to start. If it does don't let it run but for a second before you shut it off and tighten the rest of the lines. Good luck.

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620

07-25-2007 16:55:50




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 Re: CAT D-4 PROBLEMS in reply to DianeD, 07-25-2007 13:09:32  
It has been my luck that if you have more than one filter and you change them all at once then sometime it loses its prime then you have to prime it . I change one filter the start it up shut it off the change another one ect . Your results may vary .



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620

07-25-2007 15:28:33




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 Re: CAT D-4 PROBLEMS in reply to DianeD, 07-25-2007 13:09:32  
did he change the filter one at a time then restart the engine need more infortmation ?



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notify

07-25-2007 15:35:03




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 Re: CAT D-4 PROBLEMS in reply to 620, 07-25-2007 15:28:33  
No, he did not. He put them in all at once.Does this matter?



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