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Case Tractors Discussion Forum
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Case 300 Hydrolics leak

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DaveSellers

04-08-2012 11:14:29




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I have looked though the treads but did not see this condition discussed. I have a case310 and when I run the tractor near full RPM the Hydrolic oil comes out of the hole where the speed cable exits from the transmission. This means I"m loosing a lot of oil. Any idea what the problem is or the I"d required.




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John Saeli

04-08-2012 12:39:42




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 Re: Case 300 Hydrolics leak in reply to DaveSellers, 04-08-2012 11:14:29  
This is a common problem when the seal grommet is wore or gone. I would almost guess that the range - hydraulic housing, just ahead of the section you speak of is low on oil, & she has pumped it into the 4 speed housing you speak of. The forward housing requires transmission-Hyd. oil, & the 4 sp. housing requires Gear Oil. I prefer 85W140. Pull the dipstick under the seat & see if it is overfull.
That seal you need is no longer available from CASE. I recommend using Red Silicone Sealant where the cable comes through.

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DaveSellers

04-08-2012 15:27:41




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 Re: Case 300 Hydrolics leak in reply to John Saeli, 04-08-2012 12:39:42  
There is only the required oil in the rear section. The oil is being taken from the forward Hydrolic sump and forced out of the cable way and arround the gear shift. The faster the rpm the faster it comes out. It has to be filling this section from some pressure means, which is stumping me. I thought the Hydrolic return would go back into the forward sump. You don't need to be useing the Hydrolics, just driving for this to take place. The faster you go the more oil gets pumped out the speed cable hole. Is there a oil way between the front and middle section that may be blocked. The breather is not blocked.

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John Saeli

04-09-2012 04:44:46




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 Re: Case 300 Hydrolics leak in reply to DaveSellers, 04-08-2012 15:27:41  
Dave: The oil you are seeing is coming from the very front end of the rear section, not the hyd. sump. The faster you go, the faster the gears in the 4 speed gear box go, churning the oil, & forcing it out around the cable.



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Joe (Wa)

04-08-2012 15:24:50




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 Re: Case 300 Hydrolics leak in reply to John Saeli, 04-08-2012 12:39:42  
John, you are most likely right about the migration of the hydraulic oil and over-full transmission.

I have used a thin wall rubber hose around the cable along with the RTV. If the cable is missing, a short piece of standard 1/4" ID gas hose filled with rtv and clamped with the cover will plug the hole.

Joe



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Joe (Wa)

04-08-2012 12:20:14




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 Re: Case 300 Hydrolics leak in reply to DaveSellers, 04-08-2012 11:14:29  
The speedometer cable drive is in the transmission. The transmission factory oil fill was 90 wt gear oil. Check the oil level in the transmission, if it is not overfull then the speedometer cable access hole seal is leaking.

Also the transmission breather may be plugged causing a slight pressure buildup as the oil warms that is relieving through the speedo access hole seal.

At high speed the gears will churn the oil and throw it in all directions including up against the top covers.

Joe

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Jeff B.

04-08-2012 20:57:38




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 Re: Case 300 Hydrolics leak in reply to Joe (Wa), 04-08-2012 12:20:14  
Check the vent on the triple range cover. On many transmissions a plugged vent will cause oil to blow out whatever openings it can get through. Could be that wasps have plugged it up with dirt.



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