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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 450 problem - Has no power

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Rusty in SC

02-11-2006 14:40:39




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I have an early 70's model JD 450 that has absolutely no power. After cranking and lettin git warm up, it will stall out if you put it in gear. It also labors while in neutral if you raise the bucket. All the fuel lines are clear, it seems to be getting fuel to the fuel pump, then to the injector pump, and to the injectors. I disconnected the air intake hose at the block to make sure it was not an air problem. It still had same issues.

Any thoughts?

What is the fuel pressure supposed to be on the secondary side of the fuel pump?

Any suggestions appreciated.

Rusty

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Roy Suomi

02-12-2006 19:18:25




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 Re: JD 450 problem - Has no power in reply to Rusty in SC, 02-11-2006 14:40:39  
Are your hydraulics in neutral ?? I ran across a crawler loader years ago that sounded very similar in symptom....I found the loader bucket section was stuck in position causing a load on engine.. Did you take off a backhoe and not plug in the lines so oil could flow thru to sump?? Just a thought....



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Rusty in SC

02-12-2006 11:59:51




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 Re: JD 450 problem - Has no power in reply to Rusty in SC, 02-11-2006 14:40:39  
Great explanation.

I took the line off from the fuel pump, and blew air back towards the tank, I believe that would have eliminated any clog at the petcock from the tank. I also cleaned the line from the fuel pump to the filter. I broke the line loose at the injector pump coming from the filters and seem to be getting good flow there.

Next I took the return line loose after the last injector and was good flow there. With the engine running, I cracked each of the injector inlets until it started to bog down, then tightened them back up.

I also removed the air intake hose from the block and it did not solve the problem. I did check for any obstruction though.

Changing the filters is next. They are fairly new (within the last 6 months?).

In regards to the return line from the injector pump, I have not tried that but I will. Just to clarify, that is the metal line from the top of the injector pump that runs up to the return line, right?

Thanks for all the suggestions.

Rusty

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jdemaris

02-11-2006 17:26:29




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 Re: JD 450 problem - Has no power in reply to Rusty in SC, 02-11-2006 14:40:39  
Just in case you have a "C" series, or a "B" with the single square fuel filter kit - check for ice on the bottom (read on). Is doesn't need any fuel pressure and would run pretty good with no fuel pump at all. The fuel-injection pump has its own fuel transfer pump built into the back of it. Deere just added the mechanical pump as extra insurance for good fuel delivery on steep hills or at first start up. Sounds like you are lacking one of two things - enough fuel or enough air. Checking for air obstructions should be easy, just pull the rubber hose off the intake manifold. Checking for fuel might be a little more tricky. Just because you see fuel coming out at the injectors, doesn't mean there is enough. And, I don't know exactly what you did to verify fuel flow. I assumed you changed your filters - or with a C series, the one square filter. One note - if you DO have a C with a square filter - they tend to get a block of ice on the bottom and then loose power. We used to have a fleet of rentals and on many cold mornings, we take all the filters off and bring them indoors to thaw out - then drain them and put them back on. They are supposed to be drained of water daily, but it rarely ever gets done. With 350s and 450s, there is often a fuel starvation problem right in the little fuel petcock at the bottom of fuel tank. The hole in it is so small a flea couldn't pee through it - and it get's plugged easy. Now, with the fuel pump, although it's not really necessary, it can go bad and block fuel flow. If you are checking it, do so by cracking the fuel line loose where it attaches to the injection pump and crank the engine - do NOT rely on the hand-primer for checking it - it will give a false reading. If you're beyond all this, and you're absolutely sure there is a good flow of fuel getting to the pump, but not coming out - obviously there is something wrong in the pump. Just as a quick test, take the top return-fuel fitting off - take it completely out of the pump. Then start the machine and see if it runs better. I realize there will be some fuel spilling out, so don't invite the EPA over to watch. If it runs much better with the fitting removed, you've got a broken piece of plastic in the injection pump - assuming you've got a DB pump and not a C or CB pump.

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MrBill

02-12-2006 08:47:53




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 Re: JD 450 problem - Has no power in reply to jdemaris, 02-11-2006 17:26:29  
jdemaris, Your expertise amazes me. You truely are better than a JD technical rep, you miss no details. You certainly helped me with my 350b and I enjoy reading where ever I see a posting by you.
Thanks for being such a valuable resource on this forum.
MrBill



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jdemaris

02-12-2006 10:35:41




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 Re: JD 450 problem - Has no power in reply to MrBill, 02-12-2006 08:47:53  
I appreciate the compliment. I've got lots of normally useless information in my head, so it's nice when it sometimes becomes useful.



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Tom in Central Pa.

02-12-2006 09:01:14




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 Re: JD 450 problem - Has no power in reply to MrBill, 02-12-2006 08:47:53  
With the engine running, disconnect the small fuel return line, that goes back to the tank. This can be found on the top-rear of the rear injector. this line can get blocked, pinched, or plugged and cause power loss. If it runs better with the line off, find and fix the problem.



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