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  1. M

    CAT 279C forward and rearward motion slows to a creep

    just for fun go back to the first page of this section and read the posts ,the symptoms are very similar to that problem
  2. M

    This will be an interesting thread moving forward......

    i'm thinking LMM has to be involved here somehow, have you found any mysterious hand written notes or arrows on the cabinets also check the floor for grease marks and stains, especially the cabinet handles and access points
  3. M

    Cat D5KXL - Engine cranks but cannot start

    Just to add to Niges comments check to see that the pump is rotating. The pump drive gear is a taper fit to pump shaft (no key) and has been known to slip
  4. M

    621b scraper steering problems

    i think you have supplied too much information:) check to see that the diff lock pedal or plunger is not stuck down
  5. M

    277C Hydraulics bogging engine

    Be aware with the signal line disconnected from the pump. The pump out put should not increase. What you are seeing is pretty normal for a pump on minimum output. The reason to check with signal line disconnected is to make sure that the pump is not delivering high output without a commanded...
  6. M

    277C Hydraulics bogging engine

    yes that is what should happen
  7. M

    277C Hydraulics bogging engine

    i would remove and cap the signal line and fitting on the valve on the bottom of the pump if the pressure still remains high the pump or the valve on the pump are faulty i have seen the swash plate pivots on these get flat spots and cause all sorts of odd results Mark
  8. M

    277C Hydraulics bogging engine

  9. M

    277C Hydraulics bogging engine

    Thought this might help it is simplified version of the c series XPS hyd system This illustration shows the optional High Flow XPS Hydraulic System. The High Flow XPS system features a load sensing, pressure compensated, variable displacement piston pump and closed-center control valves used...
  10. M

    287C RH Joystick, changing from button to thumb wheel?

    NOTE: The auxiliary solenoids are proportional solenoids; however, they may function as ON/OFF solenoids
  11. M

    287C RH Joystick, changing from button to thumb wheel?

    if you go through with the conversion you have to change the right hand joystick from button to proportional in CAT ET
  12. M

    A25C noisy engine

    make sure the check valve between the compressor and the first tank is working correctly
  13. M

    Undid a pilot hydraulic line and lost forward movement.

    The resolvers are just single ball bearings .250 i think. When you undone the allenkey screw did you lose that ball???
  14. M

    D5m priority valve pressure loss

    i would like to see the faces under the gears and inside the cases Mark
  15. M

    John Deere 8430H

    Hi guys, in need of some help with an 8430H please. this tractor is new to us and is towing an air seeder with a hydraulic driven fan. The problem is that when you turn the machine the fan slows down and if you are not careful the seed tubes will block which is a pain in the a#se i am assuming...
  16. M

    Overload of the Day

    There's still room on the bonnet
  17. M

    Caterpillar D4H low power smoking black

    excessive oil in the flywheel housing can give symptoms like this. cause can be convertor leakage or scavenge pump blockage or malfunction
  18. M

    D4H LGP Shift Linkage Adjustment Question

    my memory is not what it should be, but if i recall correctly either rod 1 or rod 45 is actually spring loaded internally
  19. M

    D5H 1DD , trans problems

    tell the story please Nicky always interested
  20. M

    Under speed in reverse

    Do you have an operation and Maintenace manual? if not nige can direct you how to obtain one A 250 hour service for cat machines generally does not include all the filters and oils
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