PRICING AND AVAILABILITY HOME ABOUT US PRODUCTS CONTACT US CATALOG ONLINE SERVICES SUPPORT You are here: Support Technical Section This page provides answers to frequently asked questions regarding; troubleshooting basic hydraulic systems, basic installation/plumbing diagrams, basics on functionality of our control valves (manual and solenoid operated) and directions for identifying our products. Troubleshooting Basics 1) All hydraulic valves must be properly installed into the hydraulic system to prevent personal injury and/or property damage. Further, the improper servicing of a valve may result in personal injury and/or property damage. Please read and understand all catalog and service information before starting. As with all mechanical work the proper tools, knowledge, and safety equipment are required. Always wear safety glasses. 2) Make sure all pressure has been relieved in the hydraulic lines before installing or servicing a hydraulic valve. Warning: escaping hydraulic fluid under pressure can have sufficient force to penetrate skin, causing serious personal injury. Do not use your hand to check for hydraulic leaks. 3) Before installing or servicing a hydraulic component make sure all weight has been removed from the cylinders or motors before disconnecting hydraulic lines. Warning: disconnecting the hydraulic lines while the cylinder or motor is under load may result in the unexpected rapid movement of machine resulting in serious personal injury. 4) DO NOT exceed the operating specifications for pressure, flow or temperature. All hydraulic systems require a means to limit the maximum pressure. This requires either a pressure relief valve in the system or a pump that has pressure compensation. Warning: overpressure may cause sudden and unexpected failure of a component in the hydraulic system resulting in serious personal injury. Always use a gauge when adjusting a relief valve. Product Identification and Troubleshooting Product Identification FAQ Pump FAQ Loader Valve FAQ Cylinder Square Wire removal / installation FAQ Snap Ring Cylinder Repair FAQ The following are links to basic documents explaining the functionality and principles of operation of manual and solenoid directional control valves. All files are in Adobe.pdf format and will open in a new window/tab. Manual Directional Control Valves Solenoid Directional Control Valves Circuitry and Function General Circuitry FAQ The following are links to basic hydraulic plumbing and flow path diagrams. All files are in Adobe.pdf format and will open in a new window/tab. Basic Log Splitter Circuit Open Center Double Acting Open Center Single Acting Open Center/Power Beyond Double Acting Closed Center Double Acting General Circuit FAQ Product Identification FAQ Pump FAQ Loader Valve FAQ Syncing Series Cylinders Videos ISO 9001:2015 Prince Manufacturing Corporation's Quality Management System is certified to ISO 9001:2015 by Orion Registrar, Inc, as are each of our manufacturing facilities. MEMBERSHIPS CONTACT US (605) 235-1220 prince@princehyd.com More >> THE PRINCE APP load it on your Apple or Android Device ad use to easily perform hydraulic calculations and configure pumps, valves and cylinders. Copyright 2020-2025 by Prince Manufacturing Corporation Privacy Statement | Terms of Use