Case 450 crawler starts then shuts off

Brent.stewart · Jun 29, 2016

Hey I've got a 1976 case 450 dozer, I was running it for about two hours straight and all at once it lost power and then died, you can start it right back up every time but it only runs for 5 second and then shuts down like you pulled the kill switch. If tool the lines loose from the injector pump to the tank and blowed through them and it still does the same thing. Any ideas?

tomtinker · Jun 29, 2016

If you have that little fuel pump on the side of the engine, there is no filter between it and the tank, if you get
trash in it's valves it will not pump fuel.

Dieseltech · Jun 29, 2016

Try it again, but when it dies take loose the two screw timing cover on the pump side to let fuel leak out. If it runs OK with the fuel leak the injection pump needs repair. The return side is getting plugged with the weight retainer bits as it's breaking apart inside. Just repaired a 580 pump for the same problem..

JDEM · Jun 29, 2016

As Dieseltech already mentioned - it is most likely the plastic weight retainer on the governor assembly that fell apart. Once that happens, it plugs the fuel exit
circuit, the pump internal pressure gets too high, effective charge pressure becomes zero, and it shuts itself off. It will do it over and over and over. Quit, then
start fine, then peter out like it's out of fuel. Very common for any engine made before 1985 with a Stanadyne/Roosamaster DB injection pump. I had to fix both my Case
188s and 207D long ago. Also my 1982 Chevy truck and my Deere 300B. For an extra $50, the plastic can be eliminated forever if wanted. To fix back to original - takes
$50 in parts and two hours labor with the pump on the bench (or tail-gate).

Case 450 crawler starts then shuts off

Brent.stewart

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tomtinker

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Dieseltech

Well-known Member

JDEM

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