Case 1840 hydraulic oil leak

Case1840BC

New User
Hello everyone, I could really use advice how to proceed with oil dripping out from a 3/4" threaded hole in the bottom of flywheel housing. First thought was it is the main engine seal but then I realized it is the hydraulic oil because it is very clean compared to the diesel engine oil. If I got it right the oil from the tandem drive pump must be leaking around the splined shaft that slides into the splined coupler inside the flywheel housing. I searched the Case forum and so far I did not find anyone having similar problem so I am at loss what to do or how to fix it. The oil starts dripping as soon as the engine starts. I used an inspection mirror and saw few drops falling down then followed by a short trickle, then nothing for a second, then again drops, trickle and so on. The skid steer moves no problem but going up hill it leaves an oily track behind and I have to keep refilling the hydraulic oil in the main tank. Did anyone had the same or similar problem and could share some ideas what to do? Thank you. Case 1840BC
 
It is probably the seal of the input shaft of the pump is worn and leaking,there is nothing for it but to replace that seal,before you tear into it make sure nothing above that point has a leak running down and dripping from the bell housing,when you get to the shaft see that there is no up/down play in the bearing,if that checks just replace the seal.
AJ
 
There is a heavy equipment forum on line. do s search. there is a good discussion group on case skidsteers. Sounds like you may have a serious problem that may need to be fixed before you damage your pumps which will cost a lot of money as case stuff isn't cheap. If you can do the work yourself I would find service manual for your machine. just saying.
 
(quoted from post at 06:14:48 10/28/17) There is a heavy equipment forum on line. do s search. there is a good discussion group on case skidsteers. Sounds like you may have a serious problem that may need to be fixed before you damage your pumps which will cost a lot of money as case stuff isn't cheap. If you can do the work yourself I would find service manual for your machine. just saying.
Thank you pinball for the link, Heavy equipment is a really great forum for skid steers. I read all the entries regarding Case 1840 and completely understood the frustration of guys who wrote about problems when trying to remove the hoses between the tandem pump and drive motors because this is where I started also. There are six hoses crammed up under the flywheel/oil pan area and when oil leak appears it is really difficult to point out where it is coming from. Half of the hoses on my machine had the top surface gone all the way down to the steel brading in spots where the hoses rub against each other or the chassis/bell housing so I have replaced them, clean up all that area really good and only after that I was able to pinpoint the oil is actually dripping out from the hole in the bottom of the flywheel housing. No one in that forum came up with the same problem so I will have to decide what to do next. Thanks.
 
Hello AJ, I was kind of afraid that there is no quick fix for this. What makes the diagnosis more difficult is that the main pump shaft and the coupler are hidden inside the flywheel housing so it is impossible see the actual leak around the pump shaft while the engine is running. Maybe a tiny inspection video camera with a built in light could do the job but the flywheel could shred it in a flash if it touches while spinning. Once the flywheel cover is open to see the coupler and the pump shaft then there is no way to rotate the shaft to develop the oil pressure and actually see the leak around the shaft. Otherwise all the pump that is visible and its controls are very clean, nowhere any sign of oil so I am really hesitating taking that assembly apart. I suppose there is no additive to the hydraulic oil that could help to stop or decrease the leak around the shaft because it could negatively affect the drive motors? (btw they look great also, no leaks anywhere). I have seen rebuild kits for the 4 cylinder Cummins diesel engine, is there a similar kit to rebuild the tandem pump or is it strictly a specialized shop job? Thank you
 
The seal is a wearing part,once you have access to it remove the snap ring retainer prise out the seal,tap in a new one and secure it with the snap ring,I would not use any additive in the oil as there are other parts to consider.
AJ
 
Same problem on my Mustang 2060. Not pouring out, but leaving a puddle everywhere I park it. I decided it was easier to pull the motor than the pump pack. Got it this far last night.

Sorry about the sideways pic.
a176613.jpg

a176614.jpg
 
(quoted from post at 05:24:50 10/29/17) Same problem on my Mustang 2060. Not pouring out, but leaving a puddle everywhere I park it. I decided it was easier to pull the motor than the pump pack. Got it this far last night.

Sorry about the sideways pic.
a176613.jpg

a176614.jpg
Nice picture. Can you access and replace the leaking seal with the pump mounted?
Thanks everyone for the responses. It all started with the skid steer leaving oily track behind it when moving and the level in oil tank needing constant replenishing. There was lots of oil on the floor everywhere. Where all the hydraulic houses are crossing under the drive pump/ flywheel area the oil level was really deep because the hoses and dirt built a dam preventing the oil from draining out. After cleaning out all the mess and feeling the hoses I found all of them had spots worn out to the steel braid sharp as needles (made many holes in my fingers). So I thought the oil was leaking from the damaged hoses and I replaced them. Only after that, when the oil appeared on the floor under the flywheel housing area again I took an inspection mirror and saw hydraulic oil dripping from the 3/4" threaded hole in the bottom of the flywheel housing. Taking out the drive pump is not a big problem but to take it apart is where I don't think I have the right place and all the tools needed to replace the seal. For now I have installed right angle barbed fitting to the flywheel housing, attached 3/4" clear tubing connected to a plastic container placed beside the battery. The out tubing is hanging out through the floor cleaning floor hole with barbed fitting closed by 3/4" screw on cap so the oil it can be drained and measured. I want to find out if this is the last oil leak remaining at this time. If it is there should be no more oil on the floor anywhere. In the meantime if anyone can point me out where to get exploded view of the drive pump so I can get a part number for the seal and get some idea what tools I will need to take the drive pump apart, remove the old seal and replace it with a new one. Thanks for your help!
 

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