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Hi i have a 3 tone komatsu digger the ram before the bucket had a leak it was quite bad and the ram would not stretch out you had to get the digger and slowly use the bucket to pull the arm out i have taken the ram of and had it professionally done it is back on the digger but still doesn't work i have changed the hydraulic filter as well can you help

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Obviously I can't tell for sure but it sure sounds like the ram might be slighly bent therefore it will push hard against one side of the packing not allowing it to extend easily. In time it wears out the packing causing a leak. When you had it proffessionally done it most likely received new packing kit which could make the problem slightly worse because the fresh packing will be a little tighter than the packing that was replaced.

If not a bent ram then you may have a bad releif valve in that peticular hydraulic circut that doesn't close, or open which ever the case might be, thereby not pressuring up the end of the cylinder that pushes the ram out.

Mike

Posted on Apr 08, 2011

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