Hi, I would apreciate your thoughts on this problem: I have one of those chinese mini excavators (HT10 with Koop KD192f diesel motor). I recently couldn't get it to start while motor was warm, the starter seems to turn too slow. What we checked/tried so far: 1-the battery is ok (12,70 volts) ,also tried starting with jumpcables. 2-Diesel is inside fueltank and motor(we see some fumes coming out the exaust while trying to start) 3-We tried to start with starter fluid, no luck 4-There is no air in the fuel pipes (loosend the nut, fuel was seeping out) 5-Air filter and oil is clean 6-Throttlecable(?) seems right 7-I see one fuse which looks good ... The machine has only worked for 9 hours (!) I will remove back and side pannels to have a better look at everything... Do you have an idea what the cause could be please?
I would probably start by load testing the battery, if the Chinese build batteries like they build other things, 9 hrs could be the lifespan. If the battery is good, I’d see how much current the starter is drawing. Obvious things like cable connections should also be checked.
I'd check all grounds and measure voltage drops from battery out to starter.
Can you bar the engine over easily (with out excessive force)
Hook the boosters directly to the starter, might have a loose connection or broken wire