I was working my Bobcat 331D excavator for a neighbor. When finished I had to back down a gravel drive about 60-70 feet cross the road to my property. when I got to center of road I discovered I blew a hose, lots of oil on road. I had to get off road barely made it. After removing belly pan I found three hoses with wire mesh showing so I replaced all three. After filling hydto tank swing circuit, and front blade don,t work, boom works, and boom arm works, bucket seems a little slow any input would be appreciated
oldnslo
Super Member
Since problem occurred after replacing the three hoses My first thought is that you may have connected a couple of hoses to wrong port or worded another way crossed a couple of the hoses .
sandman2234
Super Member
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While some people are ok with stuff that happens, I would also wonder where all that fluid went and how your going to clean it up if the land owner complains.
David from jax
David from jax
lots went on road, oil dry cleaned up pretty good and I own land it's sitting on. some on neighbor's sand gravel drive he's ok with that
I did one at a time, took it off went to town got it put it on, then found another possible leaker, same with third. I'm wondering if I over heated pump, it bus bucking and barely moving for maybe 10-15 feet
oldnslo
Super Member
Does that machine have two pumps each supplying oil to a separate valve stack? If yes are all of the functional features on the same valve stack?
Might be possible one of the pumps isn’t moving oil now.
first thanks for any help. I know very little of Hydraulics but I'm a ok mechanic. I have parts manual and service manual, it is a two pump system, a gear pump and a piston pump. the port on pump controlling swing, blade and boost valve is on gear pump. I have no test equipment to test flow rate, only thing I could do is check line to see if I have oil in it. service manual tells and shows how to rebuild looks fairly simple. Both pumps seem fairly easy, O-rings ,seals etc. I think I can handle that, it's just determining thats my problem. everything I learned about hydraulics I learned in two days from service manual since I broke down
oldnslo
Super Member
Do you have the capability to attach a copy of the hydraulic schematic. That might help with some suggestions on possible diagnosis or things to check.
Gear pumps rarely just suddenly stop working but never say never..
Gear pumps rarely just suddenly stop working but never say never..
I don't know if I know how to send schematic but I'll do some research on that. I took off hose on manifold end from port that supplies oil to functions I'm missing and no oil coming out isn't that telling me pump isn't pumping?