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    Komatsu WB146-5 dead boom and backhoe

    The wiring on this machine is a rats nest. I assume those switches operated the solenoids in the main solenoid valve. Those do have 12 volts to them and the controls are sending hydraulic pressure to the main control valve so that does not seem to be the problem.
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    Komatsu WB146-5 dead boom and backhoe

    I am working on a Komatsu WB146-5 backhoe which has no loader boom or backhoe function at all. This machine has steering so there is hydraulic pressure from the pump. There is absolutely no movement on the boom and backhoe so they are not receiving any hydraulic pressure. This machine has...
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    Cat 446B poor start

    Thanks so much! I will keep you posted on the process and the results.
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    Cat 446B poor start

    Thanks Cmark! You highlighted the problem. I had read a little about seating the injectors but thought that was only needed after installing new cups. After reading the thread and some other forums on the problem of compression entering the fuel and causing hard starts and lots of smoke, I knew...
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    Cat 446B poor start

    I just made sure it was good and clean and installed new Cat orings. Is there more you can do other than change the cups?
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    Cat 446B poor start

    What is the correct injector height for this machine?
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    Cat 446B poor start

    CAT reman injector OR-8682
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    Cat 446B poor start

    The serial number for the CAT 446 B is 05BL00385. I tightened the injector adjustment down another 3/4 turn advancing the timing and now it starts a little better but still smokes a lot at low rpms and lacks power as well.
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    Cat 446B poor start

    I have done that and it does not seem to help much. The fuel pressure comes up rather quickly. It started like a charm before in 2 seconds before I changed the injectors. Now I need to crank it for 10 seconds before it begins to fire and then it seems to fire on just a couple cylinders for...
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    Cat 446B poor start

    What is the problem with a CAT 446B backhoe with the 3114 engine that starts hard? A little history...When I got the machine, it started very well but had no power and smoked black like a freight train. The injector rack was worn bad so I put a new CAT one in. I also put Cat reman injectors in...
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    Weak stick on Komatsu PC200-8

    Yes, John C. the stick moves considerably faster when the boom is slowly raised. Also for the other replies, my bucket and boom circuits are much stronger running at 240 (3400psi) whereas the stick doesn't put out more than 150 (2130 psi) on economy mode.I know the other functions are still low...
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    Weak stick on Komatsu PC200-8

    It is running at 330 (4700 psi) with both stalled. Both pumps run within a 100 psi from each other
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    Weak stick on Komatsu PC200-8

    More directly at your questions John C. No codes at all. I just swapped the compensation valves out for others and it makes no difference. When I move the bucket or boom at the same time as the stick, the speed and pressure increase greatly. I do not have to run bucket or boom against relief to...
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    Weak stick on Komatsu PC200-8

    Thanks for the info. There are no codes on the machine. I am giving the pressures that the monitor panel gives but we have put pressure gauges on the system and they read the same as the monitor. We have manually checked pressures on everything we can think of and even had one of the pumps...
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    Weak stick on Komatsu PC200-8

    I am working on a PC 200-8 excavator (serial # C62338) that has a very weak stick. The stick normal relief is at 150 (2130 psi) and the power relief is at 200 (2850 psi). According to my manual these figures should be 355 (5041 psi) for stick relief in economy mode and 380 (5400 psi) for power...
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