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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Cat D6C transmission problem

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Richardt

08-31-2004 10:32:27




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I have an old D6C with power shift trans. It works great for about 25 minutes and then slows down and stops. I can usualy get it to work for a few minutes if I move the gear selector in and out of gear. Then it will not move and the gear selector will also not move.If I let it sit for about 30 minutes it works again. I felt the final drives and they feel cool. Any ideas? Thanks!




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Len Sholes

09-01-2004 09:34:02




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 Re: Cat D6C transmission problem in reply to Richardt, 08-31-2004 10:32:27  
Richard it sounds to me that you have a pressure problem. That is when the oil is cool you have pressure but as soon as it warms up you lose it. This is the reason you can not get the shift lever into gear. I would put a pressure guage on the trans pump and see what you have. You should have around 300 to 350 psi. The plug on the pump is a 1/8 inch pipe thread. If you have the floor boards off and take the small cover off the top of the transmision there are two pressure ports on the pressure control valve. The one closet to the angled corner is your speed clutch tap and the other is your directional pressure port. Check with transmission in gear and at hi idle. The speed clutch should be 300 to 350 psi and the directional clutch should be 50 to 60 psi less than the speed clutch pressure. If your pressure is down I would suspect the trans pump is worn out. It is a gear pump and if you end up replacing it make sure you clean the magnetic filter, replace the trans filter and prime the pump before staring up the engine or you could have a pump failure due to lack of lubrication.

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Bob/Ont

08-31-2004 13:28:10




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 Re: Cat D6C transmission problem in reply to Richardt, 08-31-2004 10:32:27  
Richard you have a torque overheating problem caused by lack of oil flow. You likely don't have any pressure gauges so here is the most likely cause you can easily check. We can get into the more difficult things later. Pull the floor plates so you can see and clean the top of the trans. Take off the trans cover and start it up. Look for a stream of oil coming out of the sleeve that feeds the trans valve at the RH rear corner under the top cover. The seals have likely blown off the tube.
Later Bob

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