greenhead21
Member
This is what I finally came up with for my machine. Took it to Bobcat and never took the injection pump off. They checked compression came back at 350 across the board, but starts good. Thinking the thickness of the new gasket could be the explanation behind it being a touch low but not out of spec. They check the aux controls to make sure one wasn't getting stuck on or slightly on drawing power from the engine, that checked fine. They check the brakes to see if they were catching or sticking, that checked fine. They checked the turbo, the checked fine. Checked valve clearance which was off some compared to the procedure they use. They explained that Kubota valve adjustment isn't a standard procedure from normal adjustment. Once valves were adjusted it still didn't run right. They pulled injectors and had them tested again they tested fine. They cracked the flange nut for the injection pump and found that the number 2 and 3 injectors were not getting the right about of fuel. the fuel was dripping out of the number 2 and trickling out of the number 3. 1 and 4 were spraying a good strong stream. Pulled the pump and replaced with one off another machine and it ran like it should. There is also a fuel supply screw that can be adjusted on the side of the injection pump. When you are looking at the injection pump from the back of the machine it would be on the left hand side of the pump. Low idle was low at 940 should be around 1100 to 1200 so they will adjust that up and the high idle was 2800 should be 2850 to 3000 so they will adjust that up. Now waiting on new pump to get here next week and should have it back by end of week about $2000 lighter. I asked about the universal head that I thought was maybe causing the issues. They said that tier 1 heads and pumps are no longer available. The new pump will be a tier 2 pump, but that tier 1,2,3 and heads are universal for certain engines example the v2003 and v2203. The only issue is when one would get into the tier 4 where the head has changed so they were not worried with the head that was installed. The had a concern with the gasket thickness, but noted that the compression would be the only real issue they would be worried about with it. They said sometimes they will see in the injection pump the plunger or the spring break. We do not have a place in ND that can rebuild these pumps so I was stuck with a new one at $923. Either way they seem to have got the machine back to working or at least the issue narrowed down for now. Will keep you posted if anything else comes up that could help.
