When it comes to troubleshooting low power concerns on a Cat® Hydraulic Excavator, Caterpillar Maintenance Expert Jeff Payne says look at the simple things first, such as checking your machine air filters and fuel filters for restrictions - before looking at cycle times; swing, stick, bucket and boom times, or valve adjustments. For more information review your Operation Maintenance Manual specific to your Cat machine or contact your local Cat dealer. http://www.cat.com/en_US/support/dealer-locator.html Order Cat® Parts online at https://parts.cat.com/en/catcorp/home