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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Cat D3 high converter temp

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richard Edwards

05-30-2006 07:14:47




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Hi , I've got a D3 cat ,1974 running a high converter temp when under load for a while. Any help on where to start or some wisdom's from past experience are welcome and appreciated. Thanks Rich




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Bob/Ont

05-30-2006 18:02:16




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 Re: Cat D3 high converter temp in reply to richard Edwards, 05-30-2006 07:14:47  
Richard, First off make sure the brakes aren't adjusted too tight and dragging. You should notice that when running because as they heat up the drag more. Also make sure the steering clutches are releasing and the machine steers easily. If they don't release easily and fully that will load down the trans more than necessary. That said check the pump pressure at high and low idle Should be around 300 psi and hold 250 at low idle. The pump pressure releases the steering clutches and they need over 200 psi to release fully. Then take off the floor plates and on the RH side of the rear of the trans is a big oval cover. Take out that screen and clean it. When the screen gets clogged you have steering problems due to low pressure.
Later Bob

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seann

05-30-2006 12:42:40




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 Re: Cat D3 high converter temp in reply to richard Edwards, 05-30-2006 07:14:47  
Oh yeah, forgot to mention - if you can't seem to track down the problem, make sure you check the gage and sender too. Put it in some boiling hot water (preferably with a thermometer) and see if it reads accurately. Don't want to chase your tail to long if it's just a bad gage!



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seann

05-30-2006 12:38:43




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 Re: Cat D3 high converter temp in reply to richard Edwards, 05-30-2006 07:14:47  
I'm no expert, but here's a few basics: First, ensure the oil level is up to par. Second, ensure the transmission oil pressure is where it should be (on my IH machine, around 190 psi is good). If the oil pressure is too low, it can cause clutch packs to slip (creating heat) and also provide insufficient flow/pressure into the converter. Make sure the suction and pressure (safety) filter(s) are not plugged up if there is low oil pressure. Third, make sure the radiator and/or transmission oil cooler air passages are not plugged up with soot/grease/dirt/leaves etc. If they are, make sure you degrease and pressure wash it all out. Ensure there is good airflow through the radiator/cooler and in and out of the engine bay area.

Hope this helps some, good luck.

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