yellowdogsvc
Veteran Member
My s750 just turned 800 hours. In all the years I've had Bobcats (I've owned 12 high flow machines), I've never come across this.. and I've seen just about everything I think.
When my auxiliary hydraulics are on, at high RPM on standard or high flow, a loud whistle-like sound has developed. I've traced the sound to the auxiliary lines or possibly the couplers. The sound is coming from near the couplers but as I stated, it could be the lines directly behind the auxiliary couplers. It's not a vibration, rattle, or anything like that. It's a high-pitched whistle but it's definitely coming from outside the cab and I can hear it with the A/C on and ear plugs playing music. I stepped out the machine and ran an attachment at full rpm and the sound was still there. What's odd is if I roll the tilt cylinders back the sound stops for a second or two and it only whistles when the RPM's are up and the flow is at maximum either standard or high-flow.
Has anyone ever come across this? I've gone through plenty of couplers but never heard this sound before. Could it be a couple failing on the inside and a restriction causing the sound? Any advice/thoughts would be appreciated.
I also have a "chirp" sound coming from under the cab. The dealer has looked at it two times and says I have tube lines rubbing together at high frequency but they couldn't find the exact culprit. I'm sending it back to the shop, soon for another problem and I'm going to request they do whatever is necessary to find that "chirp" as it's driving me crazy. It only chirps when the hydraulics bog down.. but other than that sound, have no noticeable loss of performance.
Again, any help in the right direction would be appreciated.
When my auxiliary hydraulics are on, at high RPM on standard or high flow, a loud whistle-like sound has developed. I've traced the sound to the auxiliary lines or possibly the couplers. The sound is coming from near the couplers but as I stated, it could be the lines directly behind the auxiliary couplers. It's not a vibration, rattle, or anything like that. It's a high-pitched whistle but it's definitely coming from outside the cab and I can hear it with the A/C on and ear plugs playing music. I stepped out the machine and ran an attachment at full rpm and the sound was still there. What's odd is if I roll the tilt cylinders back the sound stops for a second or two and it only whistles when the RPM's are up and the flow is at maximum either standard or high-flow.
Has anyone ever come across this? I've gone through plenty of couplers but never heard this sound before. Could it be a couple failing on the inside and a restriction causing the sound? Any advice/thoughts would be appreciated.
I also have a "chirp" sound coming from under the cab. The dealer has looked at it two times and says I have tube lines rubbing together at high frequency but they couldn't find the exact culprit. I'm sending it back to the shop, soon for another problem and I'm going to request they do whatever is necessary to find that "chirp" as it's driving me crazy. It only chirps when the hydraulics bog down.. but other than that sound, have no noticeable loss of performance.
Again, any help in the right direction would be appreciated.