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  1. K

    Komatsu PC50uu-1 hydraulic problem

    Found the problem(s) The glow plugs are connected by a tin bar that runs across their heads and are held in place by nuts. There were no lock washers on the nuts and they vibrated lose - just enough to cause a resistance from corrosion and prevent the plugs from getting full current,
  2. K

    Komatsu PC50uu-1 hydraulic problem

    Thanks very much I'll give that a go, If they have to be replaced, do you know of a supplier? I'm thinking FridayParts may have them but am always open to different channels.
  3. K

    Komatsu PC50uu-1 hydraulic problem

    Well the beast is fixed - as far as the hydraulic problem went, but now the glow plugs are not heating up First one quit, then the second, then the last one and now it won't start. Soea anyone have a source of new plugs - and a procedure for making sure it is actually the plugs and not a relay...
  4. K

    Komatsu PC50uu-1 hydraulic problem

    OK, my machine is back and running. Problem was the spooler that the road gear pedal connected to. It would not let it back into regular mode. Mech took it apart - cleaned and resealed it and all is well. Turns out I have a set of seals for the swivel joint that I no longer need ! I want to...
  5. K

    Komatsu PC50uu-1 hydraulic problem

    5400 hours on mine, got the seals for the swivel rebuild, the Mech will turn up one day to do it I hope as I have neither the space nor the tools. Got my drive motors serviced last year, always hod one track a little more powered than the other - just the characteristics of the machine. Greg
  6. K

    Komatsu PC50uu-1 hydraulic problem

    I your blade HYdro OK, ie: can you lift the front of the machine with it? As an off chance - check the spooler the road gear works off. Mine is currently stuck in high gear - and that is routing pressure differently to the drive motors. I know that when in road gear, the steering was...
  7. K

    Komatsu PC50uu-1 hydraulic problem

    And the verdict is; All three functions that are weak, are run from 3 different spools, Right track on main spool Left track on 2 port spool Blade on 2 port spool with fast travel foot control All three spools are fed by separate pump sections So - verdict is a new reseal kit for the rotary...
  8. K

    Komatsu PC50uu-1 hydraulic problem

    Hmm, hopefully the gear lube required is the same 30W non detergent as the rest of the machine
  9. K

    Komatsu PC50uu-1 hydraulic problem

    Thanks - it was low - but not empty, strange that it has it's own reservoir - but now I know it's there - I can check it. Thanks again for your help ! The hydraulic guru is supposed to come by this afternoon, but then again, he was supposed to come by last week too :)
  10. K

    Komatsu PC50uu-1 hydraulic problem

    Finally got the old seat out - need to recover it, this is what I found The yellow filler tube was a surprise, I don't know what reservoir it fills, I do know there was no oil on the dip stick. The steering controls go to the 2 valve spooler, the blade control go to the rear one valve spooler...
  11. K

    Komatsu PC50uu-1 hydraulic problem

    Thanks for the info, I've contacted the local Hydraulic guru to come by next week, and we'll use your advice to go forward with over 5K hours I suspect the engine could use a rebuild ! I know a heater broke off in one of the cylinders last year - so I would not be surprised at that Probably a...
  12. K

    Komatsu PC50uu-1 hydraulic problem

    Ok, filters changed, oil level is correct - depending if the machine is pointing uphill or down, boom and buckets work good, turning unloaded is OK, forward and back is good if both steering levers are operated in same direction, can't turn using one lever or by operating turning levers...
  13. K

    Komatsu PC50uu-1 hydraulic problem

    Thanks !
  14. K

    Komatsu PC50uu-1 hydraulic problem

    Thanks Greg, engine running or off?
  15. K

    Komatsu PC50uu-1 hydraulic problem

    Replaced filters and oil - makes a small difference by noticeable. One further question, I filled the oil level up to the line in the sight glass, without the machine running. When it's running it pulls that level down to the bottom of the glass. Is the proper measurement to be at the line...
  16. K

    Komatsu PC50uu-1 hydraulic problem

    Picture? Did i miss it from an earlier post?
  17. K

    Komatsu PC50uu-1 hydraulic problem

    Got the oil, filters arrive today - even got a service manual on CD - only problem now is how to take off the cover so I can get at the top filter. :)
  18. K

    Komatsu PC50uu-1 hydraulic problem

    Just wondering about what to use for the hydraulic fluid. I know the manual calls for 30 WT Non detergent, but it seems there have been a lot of changes in the formula for oils since the machine was made back in the 90's. I have some Bobcat Hydraulic/Hydrostatic (40 litres) left over from when...
  19. K

    Komatsu PC50uu-1 hydraulic problem

    Awesome ! Thanks Again - trying to locate where to buy filters now. Greg
  20. K

    Komatsu PC50uu-1 hydraulic problem

    That's what I thought - I've long since lost my manual - do you recall the quantity? My sight glass was painted over by the Previous Owner and even after scraping the paint off, I can't read it. Greg
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