bugstruck
Platinum Member
Having read a number of posts regarding bent dipperstick and bent bucket cylinders I thought this might be of limited use to those experiencing that problem. I haven't yet come to an understanding of what is causing the bent bucket cylinder problems but have read that the newer BH90 BH have a larger cylinder installed in an effort to mitigate that tendancy. Hope a retofit is available and works for older units experiencing that problem. I noticed a post a few weeks ago on a dipperstick cylinder that was bending and saw the mpeg?? That illustrated the actual bending of that dipperstick cylinder in a real time situtation.
Here's the bit that I noticed today on my newer BH90 that could be of limited help: The boom and dipperstick cylinder will cycle in concert as one would expect. Either direction. I.E. you can crowd or extend both at the same time. However, the boom circuit is totally defeated (either direction) on mine when the bucket cylinder is activated. I.E. you can't crowd the bucket and the main boom cylinders at the at the same time. This would noticabley limit the load on an extended dippperstick cylinder. Two cylinders, one being the larger boom cylinder, could not both pose loads on the dipperstick cylinder at the same time. It's an either/or situtation. I'm curious if the older models have that defeat on the boom cylinder activated when the bucket is in crowd operation????
If not, that may be the problem. No way is the dippersick cylinder going to take a bucktet crowd and a boom lift at the same time. Others will say it should. I don't think so. There has been allot of talk about limits on cylinders, which I frankly don't understand. I thought the limits may have to do with a cylinders operating range???? What I'm talking about is a valve limited motion that mine is implementing. Range of motion on my cylinders is not a part of what I'm observing.
We've all been strugling to understand these failures. I just wanted to throw this in the mix in the event my observations weren't noticed by others.
HTH
Here's the bit that I noticed today on my newer BH90 that could be of limited help: The boom and dipperstick cylinder will cycle in concert as one would expect. Either direction. I.E. you can crowd or extend both at the same time. However, the boom circuit is totally defeated (either direction) on mine when the bucket cylinder is activated. I.E. you can't crowd the bucket and the main boom cylinders at the at the same time. This would noticabley limit the load on an extended dippperstick cylinder. Two cylinders, one being the larger boom cylinder, could not both pose loads on the dipperstick cylinder at the same time. It's an either/or situtation. I'm curious if the older models have that defeat on the boom cylinder activated when the bucket is in crowd operation????
If not, that may be the problem. No way is the dippersick cylinder going to take a bucktet crowd and a boom lift at the same time. Others will say it should. I don't think so. There has been allot of talk about limits on cylinders, which I frankly don't understand. I thought the limits may have to do with a cylinders operating range???? What I'm talking about is a valve limited motion that mine is implementing. Range of motion on my cylinders is not a part of what I'm observing.
We've all been strugling to understand these failures. I just wanted to throw this in the mix in the event my observations weren't noticed by others.
HTH