One of our members wrote to me regarding the following problem:
“We have a hydraulic system that operates two cylinders. The maintenance staff recently reported that the pump (piston-type) had failed – for reasons unknown at this time. The tank, valves and cylinders were cleaned and a replacement pump installed. The new pump is delivering a maximum pressure of 1,000 … Read more
A manufacturing company recently hired me to check the performance of four hydraulic pumps operating a large hydraulic press. The hydraulic pumps had clocked over 10,000 hours in service and the customer’s concern was that if pump performance was down, production would be too.
My test results revealed that the performance of all four pumps was within acceptable limits. So … Read more
In my previous articles on hydrostatic transmissions, I described the technique for determining the condition of a hydrostatic transmission using case drain flow, and discussed the role and influence of a flushing valve when doing this.
In response to these articles, some members were still confused about the influence of the charge pump when determining case drain leakage from … Read more