viper
Titanium
- Joined
- May 18, 2007
- Location
- nowhereville
We are still working on an older caterpillar machine. We have most things repaired and looking into a hydraulics noise. Before I start, I will mention that hydro oils is gray, known to have water in it, and hydro oil level is very low. We have not added oil simply because we are getting ready to change the oil due to all the contamination.
When cycling a cylinder when cold, machine sounds just fine. If cycled multiple times with higher rpm, machine will not make noise until an implement is operated, then will exhibit a growl along with vibration in the entire machine and implement but implement will still function fine other than slight jitter when operating at very slow speeds.
pumps are variable displacement axial piston pumps. I really think that the low level in the tank coupled with faster cylinder cycles pulled air in the system and cause all the noise and vibration but curious of other's experiences? We really do not want to change over 100gal of of hydro fluid if a pump is really bad but pressures and volume performance indicate otherwise at this time. even after experiencing the noisy hydro system. After allowed to sit all night, the system is still quiet next day at low rpm/demand situations. We are unwilling to exercise it much more until we change fluid.
When cycling a cylinder when cold, machine sounds just fine. If cycled multiple times with higher rpm, machine will not make noise until an implement is operated, then will exhibit a growl along with vibration in the entire machine and implement but implement will still function fine other than slight jitter when operating at very slow speeds.
pumps are variable displacement axial piston pumps. I really think that the low level in the tank coupled with faster cylinder cycles pulled air in the system and cause all the noise and vibration but curious of other's experiences? We really do not want to change over 100gal of of hydro fluid if a pump is really bad but pressures and volume performance indicate otherwise at this time. even after experiencing the noisy hydro system. After allowed to sit all night, the system is still quiet next day at low rpm/demand situations. We are unwilling to exercise it much more until we change fluid.