I recently purchased a Kobelco sk330LC-6 Ser#YC07-Q1118. Upon my arrival the machine was already started & running. Tested it out all seemed fine other than a lower rpm's upon scooping a healthy bucket up. It arrives by us and the driver shows us how to start it(which the seller didnt disclose and the reason why they had it already running) 1st thing you have to do is reach down to the bottom of the seat and pull the manual shut off knob(located right behind your right heel when sitting in seat) all the way out and hold it. Then you have to turn the key to the start position. While the engine starts cranking you have to then slowly press the manual shut off inward. When the shut off is back in about 3/4 of the way the engine starts but chugging and blowing black smoke. Then you have to turn the key to the off position and then back on in a split second of time to prevent the engine from turning off. Once you hit the key off and then quickly back on the engine then purrs like a kitten and runs fine. Except stalls(almost as if it ran out of fuel) frequently, upon a high call for power. Recently we were operating the machine and it stalled(as it has done many many times) only this time we did the whole trick to get it started as usual and it back fired when we got to the turning of the key part. Tried the whole start procedure again and it started and operated for about one minute and then stalled again. Only this time it will not start back up. We tried a quick blast of either to see if it would fire up and it did. Only wouldnt stay running. So its definately not getting fuel . We just changed the spin on filter. and since it has been down we cleaned out the filter inside the water seprator. We found a huge amount of junk in there. Put it back together, primed it and still will not fire up on its own. We are beating our head over this one :Banghead Any suggestions? We do have the service / repair manual for it
It sounds like an electrical solenoid or something on the fuel shut off isn't right or maybe the ignition switch and/or wiring is suspect. There's no way a modern machine should have such an involved and oddball starting procedure. If it's warm doesn't use ether.
I don't know if I've ever seen a Kobelco, so this is generic advice. It sounds like you have two possibly unrelated problems, the messed up starting, and the junk in the fuel system. Check the banjo bolt on the inlet to the transfer pump mounted on the injection pump. The fuel should go from that water separator to the transfer pump, to the spin on filter, back to the injection pump. The banjo bolt on the transfer pump might have a screen screwed into the hole, very easy to plug up. Good luck with the starting issues
Thanks Guys, We havent formally checked the filter at the banjo bolt only cause we recently found out it does have that as well as when we prime the fuel system you can hear plenty of fuel passing effortleesly with each pump. Now maybe it is possible that the hand primer has a more powerful draw than the actual pump has when its running? will be back on the machine today and will continue to check the electrical connections (continuity as well as ohms). And also the inlet screen at the banjo bolt. Hopefully its the latter of the 2. Will update. Thanks again for the advise Welder Dave & Delmar
UPDATE: Removd the banjo bolt off the inlet of the lift pump. The little screen was crystal clean. Place it back together, primed the fuel system then cracked each injector(1 at a time) and turned the engine over. Every injector squirts out fuel while cranking. So our guess is it would seem to be either a timing problem or electrical.... Any advise?
If every injector is squirting fuel then you have fuel right. The previous "chugging black smoke" is especially suspicious. Are there any codes to read??? If there's not a computer problem, then I don't have a clue. The black smoke one second then running fine a second later sounds like timing, but timing doesn't fix itself like that. There were Denso injection pumps that were computer controlled for timing only, that's kind of what this sounds like, you need to figure out how to read the codes.