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1987 komatsu PC120-3 Hydraulic Excavator bucket cylinder sticks at 90 degrees when pulling back

When pulling the bucket cylinder back it gets stuck at about 90 degrees coming back and have to turn of machine to relieve pressure before it works again

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 462 Answers

SOURCE: ABS brakes shudder

YOU NEED A SCANNER TO MONITOR THE WHEEL SPEED SENSORS. THE ABS IS SENSING A SKID AND THE ABS IS ACTIVATED WHEN THIS HAPPENS. THERE MAY BE A CODE FOR THE HUB THAT IS CAUSING THE ABS TO ACTIVATE.

CHECK THE WIRES FROM THE SENSORS FOR BREAKS OR CHAFFING. AN OHM READING OF THE SENSOR SHOULD BE 850-1200 OHMS, AND AND A-C VOLTAGE READING SHOULD BE 100 MV WITH YOU TURNING THE WHEEL BY HAND.

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Posted on Jul 06, 2009

  • 4 Answers

SOURCE: 330 excavator with a c9 cat engine, heavy SMOKE

At the time you made all the above repairs, did you replace the "throw away" turbo charger? The turbo charger commonly sucks oil, and it is not repairable.

Run it without the inner & outer air cleaner. If it isn't the turbo, run the injector cut out test. If the injectors are ok, then you need to replace the injection system hydraulic pump, which is also unrepairable.

Posted on Apr 23, 2010

elshaddai159
  • 1016 Answers

SOURCE: My 1987 Mazda B -

Hi,

It is sticking because the spring or the piston in the cylinder is sticking. You need to remove it and dismantle and clean it with a honing bar.

In some case's it is actually cheaper just to replace this with a new item. Then just bleed the clutch fluid.

Let me know if you need more information.

Thanks

Jason

Posted on Sep 08, 2010

HansPP
  • 2510 Answers

SOURCE: I can't get the hydraulic

Once you have undone the gland nut that presses on the flare of the pipe and holds it in, the pipe should just come out. If it does not it must be rusted in, Try spaying some penetrating oil in the threads and leave it overnight. Try wiggling and rotating it carefully to release it. If it still refuses to come out try some heat. If that fails you will have to replace the pipe and slave cylinder. (If the pipe is rusted in, you are most likely going to find that the slave cylinder is going to be badly corroded inside as well).

Posted on Feb 25, 2011

emissionwiz
  • 75797 Answers

SOURCE: piling rig ,grab bucket cylinder,when piston come out from cylinder function is slow ,piston goes return to the cylinder function is normal speed,working pressure 80bar(without load),maximum pressure

You may have this posted in the wrong product category. Please select another category appropriate to the problem and re-post the problem so the correct expert will see and respond to the question..

Posted on Sep 06, 2012

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