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Allis Chalmers Discussion Forum
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WD hydrolic leak

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Hossman

03-31-2006 14:48:05




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Does anyone have any ideas on a "mystery leak " on a WD? The hydro oil leaks very bad when there is a load on the two pt. arms (8 ft. allis disk) The oil runs out the bottom of tractor on the right side out the large inspection hole right next to the drawbar radius where the drawbar pins hold the hith in place. I just dont see how oil is gittin to the back of tractor from the hydrolic resevor and leaking out the bottom. Any suggestions out there/ thank you, Hoss

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wdtom

04-04-2006 18:33:07




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 Re: WD hydrolic leak in reply to Hossman, 03-31-2006 14:48:05  
This seems puzzleing. There is an inspection hole in the bottom of the clutch housing just back from the engine, oil leaking out here could by hydraulic fluid. the cover under the battery box covers the hand clutch, which runs in transmission oil. There are 2 transmission oil fill/level plugs on the left side of the transmission. They are square head pipe plugs and are between the rear axle and the hydraulic fill/dipstick, on the side of the transmission inside of the frame rail. Is it possible the hydraulic pump itself has a leak that is running down the side of the tractor and dripping? All the pressure is built up inside the pump, on the right side of the hydraulic housing, under the belt pully area. It then goes out the top of the valve to the hoses. There is no pressure inside the main tractor castings, it is all inside the pump which bolts on the side as I described above. You can e mail me if you want, just put something like Allis WD in the subject so I won't delete it with the huge amount of spam I get. Good luck with the problem. Let us know what you find, or for that matter don't find.

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Hossman

04-04-2006 13:51:37




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 Re: WD hydrolic leak in reply to Hossman, 03-31-2006 14:48:05  
WDTOM, Thanks for the input. I'm pretty sure there is no oil leak in any hydrolic line or hose, the oil is leakin outa the large holes I mentioned before on the underside of tractor, and when the rams are loaded with anything the leak is pretty bad.You can lay on the ground with the implement lifted and look up at the inspection hole and see the oil is leakin from the "inside" of the tractor. The oil level is goin down on the hydrolics and cant say that Ive noticed it comin up on any thing else.So far ive removed batt. box and the inspection cover underneith to lookinto this area and didnt see anything diff. in the hand cluth area. Will continue to trouble shoot this and let ya know if I find any thing. Thanks again, Hossman

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wdtom

04-03-2006 17:10:38




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 Re: WD hydrolic leak in reply to Hossman, 03-31-2006 14:48:05  
From what you have said I don't really know what to think. I will offer a few suggestions though. Hydraulic oil can lead into the transmission through the seal between the hydraulic housing and the transmission. This will raise the oil level in the transmission as it is normally lower than the hydraulic systen oil level. This could make the rear axle seals leak and oil run out the hole in the axle housings under the brakes? Is this where it is leaking? Probably not as you mentioned it had to do with loading the rams, that is lifting a load. Do you have a pin hole in a hose that is sparying oil on the tractor and it is running down and looking like it is leaking out of somewhere else? Check the oil levels in the transmission, hydraylic system. If the hydraulic system is getting lower over time and the transmission is raising, it is the above mentioned seal leaking between the two. If a close inspection of the hoses showes them to be OK, I would clean off the tractor really good in the area of the leak and watch to see just where it is comming from. The kind of oil will tell you too. Probably the transmission has 90 wt. gear oil and the hydraulic system has either 20 weight engine oil or some sort of hydraulic oil in it. Hope this helps, get back to us with your findings.

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Hossman

04-11-2006 17:51:53




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 Re: WD hydrolic leak in reply to wdtom, 04-03-2006 17:10:38  
wdtom and all the fellers that replied, Thanks again for the info,checked the transmission fill plug and the oil came boilin out like ol faithful, I reckon after plantin I'll be tearin into the ol gal. I will consult the I.T. manual and my AC repair books as it sounds as if I'll be breakin the ol gal in half. Thanks again fellows, Hoss



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dave knaggs

04-04-2006 18:41:08




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 Re: WD hydrolic leak in reply to wdtom, 04-03-2006 17:10:38  
I have a wd that leaks hydraulic oil out of the bottom holes. the level for the transmission oil goes up. it pours out when i pull the plug for the transmission fill point. it doesn't leak any more or any less when i use the lift.



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wdtom

04-05-2006 17:57:00




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 Re: WD hydrolic leak in reply to dave knaggs, 04-04-2006 18:41:08  
You probably have a leaky seal between the hydraulic sys and the transmission. The hydraulic oil level is normally higher than the transmission oil level so if this seal leaks it will flow from hyd to trans. You have to split the tractor, would recomend looking at a ITT manual and the AC manual, there is good information in both about this seal. I could tell you but you would probably want the books anyway, and there is quite a bit to explalin about old "one seal" and newer "two seal" systems.

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