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  1. E

    Cat 312 bl, jerky hydraulics

    I have a cat 312bl,98 mod. It has 12500h on the clock. I was bought only a few years ago as a farm machine and i have only used it a few houndred hours of the total. Right from the start i noticed that the hydraulic became jerky when the fluid became warm. When operating and tracking at the same...
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    Cat E120B hydraulic drive motors

    Thank you Atco for a informative post, now i understand what its all about. When i pull out the center joint it is going down trough the undercarriage as i understand. How heavy is the joint on a cat 312 you think? I`ve read that it`s an easy and cheap fix but i could always use some more info...
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    Cat E120B hydraulic drive motors

    Thanks Per, my vocabulary for excavator parts in english isnt all that good. I`ve been searching the forum and found different threads about this subject. Can i assume that slew joint and rotary joint is the same as the swivel as well, or am i mixing the cards completely? What exactly happens...
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    Cat E120B hydraulic drive motors

    Hello! My 312bl has the same sympthoms but only one drive motor is weak when cold, but both will become weaker and sometimes twitchy when the machine is warm. i`m thinking this could be the swivel seals too after reading the above posts. But when you say swivel do you mean swing gear or swing...
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    Downhill

    Thanks for good information around this subject. I`m one of those hobby diggers who gladly wants to learn by reading instead of inventing the wheel when i`m already in a lifethreatning situation. I am sure much of this is natural to the experienced operators but to us who dont dig on daily basis...
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    312 swing problem

    It does`nt feel like its under too much load when it gets stuck. Hard to say cause it has been a while since i used it. I hope i get the time to use the old cat this weekend and see if any of your tips can help.
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    312 swing problem

    I think i will swap the pressureswitches and see if the problem changes. Are the valves more common to fail when the hydraulicoil gets warmer? It would be a easy fix
  8. E

    312 swing problem

    Someone told me earlier to replace the solenoid so i did, but the problem is just the same. When i`m low on throtle it sometimes will not mowe in either direction when its warm, but when throtteling up a bit it starts mowing again. When digging on full throttle it stopps wery instant, almost...
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    312 swing problem

    I have a 98 312bl with lots of hours on it. One day as i was doing some hard digging the swing suddenly stopped.When i swung in the opposite direction it started working again but a little later it stopped again. When i tried another day it worked fine for an hour,maybe two before the swing got...
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    Test

    test
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    test

    test:drinkup
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    Test

    test3
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    Test

    test2
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    Test

    test1
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