Hi, After not fixing my existing 743 bobcat with a wheel bearing problem, I instead bought a second 743 for what I thought was a good price, and came with 2 buckets and pallet forks. The seller said it was hard to start, there was a lot of smoke on start up, and whenever the throttle was changed. He also said was air in the lines, could not get out, and suspected a bad injector (although said he didn't know much about diesels). He had replaced the glow plugs, starter, hydraulic pump (he said). Once I got it home, I found a missing nut on the glow plug wire (I think on cylinder #3, the second closest to the front of the machine). After putting a new nut on it, the machine started much easier cold, but still stumbled, stalled once, then upon restart ran fine. The smoke however, was impressively large in quantity (just about smoked myself out of the barn!), I thought was mostly black, smoked about 5 minutes, then stopped mostly, and did not come back, even when changing the throttle.
I usually misdiagnose everything, so am looking for some advice. First off, I replaced the engine oil (did not tilt the bobcat back and made a bit of a mess), added coolant (took about 1/2 gallon), checked the hydraulic oil (no sight glass, instead was a plastic "bolt"). I plan to replace the air filters (cost me a "mere" $60 at the dealer!). I'm also planning to replace all the fuel lines, primer bulb, fuel filter, remove fuel tank and replace the pickup tube/screen), because I have the parts and think I can do without screwing up too badly. Also bought a replaced bleed screw (that screws into the injector assembly and used to bleed the fuel line).
I suspect that 1 or more fuel injectors may be bad? Perhaps leaking, which is causing the huge amount of smoke on startup. Thoughts?
Oh yeah, just had to mention, the previous owner must have removed the piston for the boom, and replaced it upside down. I found that out when trying to grease it up! Incredible!
I usually misdiagnose everything, so am looking for some advice. First off, I replaced the engine oil (did not tilt the bobcat back and made a bit of a mess), added coolant (took about 1/2 gallon), checked the hydraulic oil (no sight glass, instead was a plastic "bolt"). I plan to replace the air filters (cost me a "mere" $60 at the dealer!). I'm also planning to replace all the fuel lines, primer bulb, fuel filter, remove fuel tank and replace the pickup tube/screen), because I have the parts and think I can do without screwing up too badly. Also bought a replaced bleed screw (that screws into the injector assembly and used to bleed the fuel line).
I suspect that 1 or more fuel injectors may be bad? Perhaps leaking, which is causing the huge amount of smoke on startup. Thoughts?
Oh yeah, just had to mention, the previous owner must have removed the piston for the boom, and replaced it upside down. I found that out when trying to grease it up! Incredible!