need help pc300

pc300-7 boom up and travel speeds are slow and week

Need a little more info. Serial number to start with. Hour meter is real helpful. Maybe a better description of what is happening when you operate the machine. Any fault codes? What is the engine doing when the symptoms happen? Does the machine walk straight when traveling. What happens when you use multiple functions at the same time? What have you checked before asking the question here? Fuel filters, fuel strainer, air filters, checked throttle linkages if the machine has them.
This will get you started.

A87019 Hrs 23000 walks straight all filters good fuel lines good engine runs up fine no codes suction screen is clean every thing works as it should but boom up is slow and weak and travel and no change if you run multiple functions. and when you boom up it just slow around half speed or less and the engine picks up as it should. traveling just real weak

What happens when you run the stick out and in? Can you turn one track at a time in low range and high range. Do you know how to plumb gauges into the pump? Do you have a service manual?

stick in and out is fine yes I can plumb gauges I just picked up the service manual