Hello knowledgeable Heavy Equipment forum members.
I have a Yanmar VIO2-2 excavator. All rams are operating fine with a solid hold apart from the blade.
The blade is only drifting down, which expands the cylinder (spear exits cylinder). It does not drift in the opposite direction (spear enters cylinder) when the excavator is resting on blade, for example.
There is only the weight of the blade expanding the cylinder, so relatively little load.
If I raise the blade as high as it will go (cylinder fully retracted), it immediately starts drifting down as soon as the lever is let go at a rate of about 8mm/sec.
When the lever is activated in the opposite direction, to drive blade down intentionally - it takes time for the hydraulic action to "catch up" with the drift. In other words, if the blade is raised as high as it will go, and left to "fall" to the ground, then the blade lever is activated in a downward direction - it takes the same amount of time for the blade to start lifting the excavator, as if the blade was still at the top. Momentarily there is no active movement of the blade, until the distance the blade has dropped has been taken up (by what?).
I'm mechanically capable - and have no problem disassembling the valve bank/ram for the required repair. Just need some guidance on where the likely cause is of this problem.
Thanks all for your time.
I have a Yanmar VIO2-2 excavator. All rams are operating fine with a solid hold apart from the blade.
The blade is only drifting down, which expands the cylinder (spear exits cylinder). It does not drift in the opposite direction (spear enters cylinder) when the excavator is resting on blade, for example.
There is only the weight of the blade expanding the cylinder, so relatively little load.
If I raise the blade as high as it will go (cylinder fully retracted), it immediately starts drifting down as soon as the lever is let go at a rate of about 8mm/sec.
When the lever is activated in the opposite direction, to drive blade down intentionally - it takes time for the hydraulic action to "catch up" with the drift. In other words, if the blade is raised as high as it will go, and left to "fall" to the ground, then the blade lever is activated in a downward direction - it takes the same amount of time for the blade to start lifting the excavator, as if the blade was still at the top. Momentarily there is no active movement of the blade, until the distance the blade has dropped has been taken up (by what?).
I'm mechanically capable - and have no problem disassembling the valve bank/ram for the required repair. Just need some guidance on where the likely cause is of this problem.
Thanks all for your time.
Yanmar VIO2-2 Excavator Blade Slowly Dropping/Drifting - Help Required Please
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