Hydraulic Oil Leak

SmokeyBear20252

New member

Equipment
Kubota L3901 HST 4WD
Aug 29, 2012
36
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0
Hildebran, NC
Hello,

I have a Kubota B7610 with about 260 hours on it. This has been a great tractor and I try to take really could care of it by maintaining it according to the Kubota schedule. I also inspect it regularly to try to head off any potentially big problems by catching them when they are little problems. I'm not sure when this developed or if it has been here since I've had the tractor but I noticed a slight amount of hydraulic oil around the part pictured in the attachment (red arrow pointing to the area where I'm seeing the fluid). It's not a lot of oil; just enough to notice if you're actually looking to find something. It looks to be an integral part of the hydraulic oil delivery line. I'm not sure what the purpose of this part is but looking at the parts illustration, it appears to have a cap, two bolts and an o-ring. I checked the two bolts and they are tight. It's hard to tell exactly where the oil is seeping from but it seems to be coming from the part labeled as the cap. I'm wondering, is there some sort of gasket that isn't labeled under that cap? Or could that o-ring be defective? I've not taken anything apart yet; I didn't want to do exploratory surgery and end up loosing a bunch of that liquid gold fluid. Any ideas? Thanks in advance!
 

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North Idaho Wolfman

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Jun 9, 2013
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Sandpoint, ID
That is a block to tie into the hydraulics, looks like a very minor leak considering what kind of pressure it under.
it's just a couple of O-rings that do the sealing, pull the cover and put a couple of new O-rings in it.
The O-rings are metric too!
 

Stubbyie

New member
Jul 1, 2010
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Midcontinent
I've had something similar develop.

Order O-rings from dealer using Kubota part number to be CERTAIN you're using the correct dimension rings. Cheap insurance against a failure and recourse if there is a problem.

Before taking apart figure out where the other end of that pipe connects. Since it's hard-plumbed you'll probably have to take the other end apart to lift up the now-leaking end---probably another set of O-rings or some other replaceable part to get in the same order or trip to town.

Consider reassembly using highest quality RTV in a skim over the new O-ring(s) (may be two concentric), then making up almost tight, let sit couple hours, then finish tightening. If using RTV make all surfaces and grooves scrupulously clean using repeated alcohol wipes.

Please post back your experiences so we may all learn.